Rewrite lua_api.txt into Markdown format

Just Markdown, no variant of it. File name intentionally
not changed to “lua_api.md” because of fear to break references
to that file. The file can still be renamed later.

1 files changed, 2833 insertions, 2530 deletions

diff --git a/doc/lua_api.txt b/doc/lua_api.txt
index 642ac4130..07d756aa4 100644
--- a/doc/lua_api.txt
+++ b/doc/lua_api.txt
@@ -1,10 +1,10 @@
 Minetest Lua Modding API Reference 0.4.11
-========================================
-More information at http://www.minetest.net/
-Developer Wiki: http://dev.minetest.net/
+=========================================
+* More information at <http://www.minetest.net/>
+* Developer Wiki: <http://dev.minetest.net/>
 
 Introduction
--------------
+------------
 Content and functionality can be added to Minetest 0.4 by using Lua
 scripting in run-time loaded mods.
 
@@ -19,40 +19,47 @@ functionality in the engine and API. You can send such improvements as
 source code patches to <celeron55@gmail.com>.
 
 Programming in Lua
--------------------
-If you have any difficulty in understanding this, please read:
-  http://www.lua.org/pil/
+------------------
+If you have any difficulty in understanding this, please read [Programming in Lua](http://www.lua.org/pil/).
 
 Startup
---------
+-------
 Mods are loaded during server startup from the mod load paths by running
-the init.lua scripts in a shared environment.
+the `init.lua` scripts in a shared environment.
 
 Paths
 -----
-RUN_IN_PLACE=1: (Windows release, local build)
- $path_user:  Linux:    <build directory>
-              Windows:  <build directory>
- $path_share: Linux:    <build directory>
-              Windows:  <build directory>
-
-RUN_IN_PLACE=0: (Linux release)
- $path_share: Linux:    /usr/share/minetest
-              Windows:  <install directory>/minetest-0.4.x
- $path_user:  Linux:    ~/.minetest
-              Windows:  C:/users/<user>/AppData/minetest (maybe)
+* `RUN_IN_PLACE=1` (Windows release, local build)
+    *  `$path_user`:
+        * Linux: `<build directory>`
+        * Windows: `<build directory>`
+    * `$path_share`
+        * Linux: `<build directory>`
+        * Windows:  `<build directory>`
+* `RUN_IN_PLACE=0`: (Linux release)
+    * `$path_share`
+        * Linux: `/usr/share/minetest`
+        * Windows: `<install directory>/minetest-0.4.x`
+    * `$path_user`:
+        * Linux: `$HOME/.minetest`
+        * Windows: `C:/users/<user>/AppData/minetest` (maybe)
 
 Games
 -----
 Games are looked up from:
-  $path_share/games/gameid/
-  $path_user/games/gameid/
-where gameid is unique to each game.
 
-The game directory contains the file game.conf, which contains these fields:
-  name = <Human-readable full name of the game>
+* `$path_share/games/gameid/`
+* `$path_user/games/gameid/`
+
+where `gameid` is unique to each game.
+
+The game directory contains the file `game.conf`, which contains these fields:
+
+    name = <Human-readable full name of the game>
+
 e.g.
-  name = Minetest
+
+    name = Minetest
 
 The game directory can contain the file minetest.conf, which will be used
 to set default settings when running the particular game.
@@ -60,21 +67,24 @@ to set default settings when running the particular game.
 Mod load path
 -------------
 Generic:
-  $path_share/games/gameid/mods/
-  $path_share/mods/
-  $path_user/games/gameid/mods/
-  $path_user/mods/ <-- User-installed mods
-  $worldpath/worldmods/
+
+* `$path_share/games/gameid/mods/`
+* `$path_share/mods/`
+* `$path_user/games/gameid/mods/`
+* `$path_user/mods/` (User-installed mods)
+* `$worldpath/worldmods/`
 
 In a run-in-place version (e.g. the distributed windows version):
-  minetest-0.4.x/games/gameid/mods/
-  minetest-0.4.x/mods/ <-- User-installed mods
-  minetest-0.4.x/worlds/worldname/worldmods/
+
+* `minetest-0.4.x/games/gameid/mods/`
+* `minetest-0.4.x/mods/` (User-installed mods)
+* `minetest-0.4.x/worlds/worldname/worldmods/`
 
 On an installed version on Linux:
-  /usr/share/minetest/games/gameid/mods/
-  ~/.minetest/mods/ <-- User-installed mods
-  ~/.minetest/worlds/worldname/worldmods
+
+* `/usr/share/minetest/games/gameid/mods/`
+* `$HOME/.minetest/mods/` (User-installed mods)
+* `$HOME/.minetest/worlds/worldname/worldmods`
 
 Mod load path for world-specific games
 --------------------------------------
@@ -84,263 +94,327 @@ games are loaded or checked from anywhere else.
 This is useful for e.g. adventure worlds.
 
 This happens if the following directory exists:
-  $world/game/
+
+    $world/game/
 
 Mods should be then be placed in:
-  $world/game/mods/
+
+    $world/game/mods/
 
 Modpack support
 ----------------
 Mods can be put in a subdirectory, if the parent directory, which otherwise
-should be a mod, contains a file named modpack.txt. This file shall be
-empty, except for lines starting with #, which are comments.
+should be a mod, contains a file named `modpack.txt`. This file shall be
+empty, except for lines starting with `#`, which are comments.
 
 Mod directory structure
 ------------------------
-mods
-|-- modname
-|   |-- depends.txt
-|   |-- screenshot.png
-|   |-- description.txt
-|   |-- init.lua
-|   |-- models
-|   |-- textures
-|   |   |-- modname_stuff.png
-|   |   `-- modname_something_else.png
-|   |-- sounds
-|   |-- media
-|   `-- <custom data>
-`-- another
-
-modname:
-  The location of this directory can be fetched by using
-  minetest.get_modpath(modname)
-
-depends.txt:
-  List of mods that have to be loaded before loading this mod.
-  A single line contains a single modname.
-
-  Optional dependencies can be defined by appending a question mark
-  to a single modname. Their meaning is that if the specified mod
-  is missing, that does not prevent this mod from being loaded.
-
-screenshot.png:
-  A screenshot shown in modmanager within mainmenu.
-
-description.txt:
-  File containing description to be shown within mainmenu.
-
-init.lua:
-  The main Lua script. Running this script should register everything it
-  wants to register. Subsequent execution depends on minetest calling the
-  registered callbacks.
-
-  minetest.setting_get(name) and minetest.setting_getbool(name) can be used
-  to read custom or existing settings at load time, if necessary.
-
-models:
-	Models for entities or meshnodes.
-
-textures, sounds, media:
-  Media files (textures, sounds, whatever) that will be transferred to the
-  client and will be available for use by the mod.
+
+    mods
+    |-- modname
+    |   |-- depends.txt
+    |   |-- screenshot.png
+    |   |-- description.txt
+    |   |-- init.lua
+    |   |-- models
+    |   |-- textures
+    |   |   |-- modname_stuff.png
+    |   |   `-- modname_something_else.png
+    |   |-- sounds
+    |   |-- media
+    |   `-- <custom data>
+    `-- another
+
+
+### modname
+The location of this directory can be fetched by using
+`minetest.get_modpath(modname)`.
+
+### `depends.txt`
+List of mods that have to be loaded before loading this mod.
+
+A single line contains a single modname.
+
+Optional dependencies can be defined by appending a question mark
+to a single modname. Their meaning is that if the specified mod
+is missing, that does not prevent this mod from being loaded.
+
+### `screenshot.png`
+A screenshot shown in modmanager within mainmenu.
+
+### `description.txt`
+A File containing description to be shown within mainmenu.
+
+### `init.lua`
+The main Lua script. Running this script should register everything it
+wants to register. Subsequent execution depends on minetest calling the
+registered callbacks.
+
+`minetest.setting_get(name)` and `minetest.setting_getbool(name)` can be used
+to read custom or existing settings at load time, if necessary.
+
+### `models`
+Models for entities or meshnodes.
+
+### `textures`, `sounds`, `media`
+Media files (textures, sounds, whatever) that will be transferred to the
+client and will be available for use by the mod.
 
 Naming convention for registered textual names
 ----------------------------------------------
 Registered names should generally be in this format:
-  "modname:<whatever>" (<whatever> can have characters a-zA-Z0-9_)
+
+    "modname:<whatever>" (<whatever> can have characters a-zA-Z0-9_)
 
 This is to prevent conflicting names from corrupting maps and is
 enforced by the mod loader.
 
-Example: mod "experimental", ideal item/node/entity name "tnt":
-         -> the name should be "experimental:tnt".
+### Example
+In the mod `experimental`, there is the ideal item/node/entity name `tnt`.
+So the name should be `experimental:tnt`.
 
-Enforcement can be overridden by prefixing the name with ":". This can
+Enforcement can be overridden by prefixing the name with `:`. This can
 be used for overriding the registrations of some other mod.
 
-Example: Any mod can redefine experimental:tnt by using the name
-         ":experimental:tnt" when registering it.
-(also that mod is required to have "experimental" as a dependency)
+Example: Any mod can redefine `experimental:tnt` by using the name
 
-The ":" prefix can also be used for maintaining backwards compatibility.
+    :experimental:tnt
 
-Aliases
--------
-Aliases can be added by using minetest.register_alias(name, convert_to)
+when registering it.
+(also that mod is required to have `experimental` as a dependency)
+
+The `:` prefix can also be used for maintaining backwards compatibility.
+
+### Aliases
+Aliases can be added by using `minetest.register_alias(name, convert_to)`.
 
 This will make Minetest to convert things called name to things called
-convert_to.
+`convert_to`.
 
 This can be used for maintaining backwards compatibility.
 
 This can be also used for setting quick access names for things, e.g. if
-you have an item called epiclylongmodname:stuff, you could do
-  minetest.register_alias("stuff", "epiclylongmodname:stuff")
-and be able to use "/giveme stuff".
+you have an item called `epiclylongmodname:stuff`, you could do
+
+    minetest.register_alias("stuff", "epiclylongmodname:stuff")
+
+and be able to use `/giveme stuff`.
 
 Textures
 --------
-Mods should generally prefix their textures with modname_, e.g. given
-the mod name "foomod", a texture could be called
-  "foomod_foothing.png"
+Mods should generally prefix their textures with `modname_`, e.g. given
+the mod name `foomod`, a texture could be called:
+
+    foomod_foothing.png
 
 Textures are referred to by their complete name, or alternatively by
 stripping out the file extension:
-  e.g. foomod_foothing.png
-  e.g. foomod_foothing
+
+* e.g. `foomod_foothing.png`
+* e.g. `foomod_foothing`
 
 Texture modifiers
 -----------------
 There are various texture modifiers that can be used
 to generate textures on-the-fly.
 
-Texture overlaying:
-  Textures can be overlaid by putting a ^ between them.
-  Example: default_dirt.png^default_grass_side.png
-    default_grass_side.png is overlayed over default_dirt.png
-
-Texture grouping:
-  Textures can be grouped together by enclosing them in ( and ).
-  Example: cobble.png^(thing1.png^thing2.png)
-    A texture for 'thing1.png^thing2.png' is created and the resulting
-    texture is overlaid over cobble.png.
-
-Advanced texture modifiers:
-  [crack:<n>:<p>
-    n = animation frame count, p = current animation frame
-    Draw a step of the crack animation on the texture.
-    Example: default_cobble.png^[crack:10:1
-
-  [combine:<w>x<h>:<x1>,<y1>=<file1>:<x2>,<y2>=<file2>
-    w = width, h = height, x1/x2 = x position, y1/y1 = y position,
-    file1/file2 = texture to combine
-    Create a texture of size <w> x <h> and blit <file1> to (<x1>,<y1>)
-    and blit <file2> to (<x2>,<y2>).
-    Example: [combine:16x32:0,0=default_cobble.png:0,16=default_wood.png
-
-  [brighten
-    Brightens the texture.
-    Example: tnt_tnt_side.png^[brighten
-
-  [noalpha
-    Makes the texture completely opaque.
-    Example: default_leaves.png^[noalpha
-
-  [makealpha:<r>,<g>,<b>
-    Convert one color to transparency.
-    Example: default_cobble.png^[makealpha:128,128,128
-
-  [transform<t>
-    t = transformation(s) to apply
-    Rotates and/or flips the image.
-    <t> can be a number (between 0 and 7) or a transform name.
-	Rotations are counter-clockwise.
-     0  I      identity
-     1  R90    rotate by 90 degrees
-     2  R180   rotate by 180 degrees
-     3  R270   rotate by 270 degrees
-     4  FX     flip X
-     5  FXR90  flip X then rotate by 90 degrees
-     6  FY     flip Y
-     7  FYR90  flip Y then rotate by 90 degrees
-    Example: default_stone.png^[transformFXR90
-
-  [inventorycube{<top>{<left>{<right>
-     '^' is replaced by '&' in texture names
-    Create an inventory cube texture using the side textures.
-    Example: [inventorycube{grass.png{dirt.png&grass_side.png{dirt.png&grass_side.png
-     Creates an inventorycube with 'grass.png', 'dirt.png^grass_side.png' and
-     'dirt.png^grass_side.png' textures
-
-  [lowpart:<percent>:<file>
-    Blit the lower <percent>% part of <file> on the texture:
-    Example: base.png^[lowpart:25:overlay.png
-
-  [verticalframe:<t>:<n>
-    t = animation frame count, n = current animation frame
-    Crops the texture to a frame of a vertical animation.
-    Example: default_torch_animated.png^[verticalframe:16:8
-
-  [mask:<file>
-    Apply a mask to the base image.
-    The mask is applied using binary AND.
-
-  [colorize:<color>
-    Colorize the textures with given color
-    <color> as ColorString
+### Texture overlaying
+Textures can be overlaid by putting a `^` between them.
+
+Example:
+
+    default_dirt.png^default_grass_side.png
+
+`default_grass_side.png` is overlayed over `default_dirt.png`.
+
+### Texture grouping
+Textures can be grouped together by enclosing them in `(` and `)`.
+
+Example: `cobble.png^(thing1.png^thing2.png)`
+
+A texture for `thing1.png^thing2.png` is created and the resulting
+texture is overlaid over `cobble.png`.
+
+### Advanced texture modifiers
+
+#### `[crack:<n>:<p>`
+* `<n>` = animation frame count
+* `<p>` = current animation frame
+
+Draw a step of the crack animation on the texture.
+
+Example:
+
+    default_cobble.png^[crack:10:1
+
+#### `[combine:<w>x<h>:<x1>,<y1>=<file1>:<x2>,<y2>=<file2>`
+* `<w>` = width
+* `<h>` = height
+* `<x1>`/`<x2>` = x positions
+* `<y1>`/`<y1>` = y positions
+* `<file1>`/`<file2>` = textures to combine
+
+Create a texture of size `<w>` times `<h>` and blit `<file1>` to (`<x1>`,`<y1>`)
+and blit `<file2>` to (`<x2>`,`<y2>`).
+
+Example:
+
+    [combine:16x32:0,0=default_cobble.png:0,16=default_wood.png
+
+#### `[brighten`
+Brightens the texture.
+
+Example:
+
+    tnt_tnt_side.png^[brighten
+
+#### `[noalpha`
+Makes the texture completely opaque.
+
+Example:
+
+    default_leaves.png^[noalpha
+
+#### `[makealpha:<r>,<g>,<b>`
+Convert one color to transparency.
+
+Example:
+
+    default_cobble.png^[makealpha:128,128,128
+
+#### `[transform<t>`
+* `<t>` = transformation(s) to apply
+
+Rotates and/or flips the image.
+
+`<t>` can be a number (between 0 and 7) or a transform name.
+Rotations are counter-clockwise.
+
+    0  I      identity
+    1  R90    rotate by 90 degrees
+    2  R180   rotate by 180 degrees
+    3  R270   rotate by 270 degrees
+    4  FX     flip X
+    5  FXR90  flip X then rotate by 90 degrees
+    6  FY     flip Y
+    7  FYR90  flip Y then rotate by 90 degrees
+
+Example:
+
+    default_stone.png^[transformFXR90
+
+#### `[inventorycube{<top>{<left>{<right>`
+`^` is replaced by `&` in texture names.
+
+Create an inventory cube texture using the side textures.
+
+Example:
+
+    [inventorycube{grass.png{dirt.png&grass_side.png{dirt.png&grass_side.png
+
+Creates an inventorycube with `grass.png`, `dirt.png^grass_side.png` and
+`dirt.png^grass_side.png` textures
+
+#### `[lowpart:<percent>:<file>`
+Blit the lower `<percent>`% part of `<file>` on the texture.
+
+Example:
+
+    base.png^[lowpart:25:overlay.png
+
+#### `[verticalframe:<t>:<n>`
+* `<t>` = animation frame count
+* `<n>` = current animation frame
+
+Crops the texture to a frame of a vertical animation.
+
+Example:
+
+    default_torch_animated.png^[verticalframe:16:8
+
+#### `[mask:<file>`
+Apply a mask to the base image.
+
+The mask is applied using binary AND.
+
+#### `[colorize:<color>`
+Colorize the textures with the given color.
+`<color>` is specified as a `ColorString`.
 
 Sounds
--------
-Only OGG Vorbis files are supported.
+------
+Only Ogg Vorbis files are supported.
 
 For positional playing of sounds, only single-channel (mono) files are
 supported. Otherwise OpenAL will play them non-positionally.
 
-Mods should generally prefix their sounds with modname_, e.g. given
-the mod name "foomod", a sound could be called
-  "foomod_foosound.ogg"
+Mods should generally prefix their sounds with `modname_`, e.g. given
+the mod name "`foomod`", a sound could be called:
+
+    foomod_foosound.ogg
 
 Sounds are referred to by their name with a dot, a single digit and the
-file extension stripped out.  When a sound is played, the actual sound file
+file extension stripped out. When a sound is played, the actual sound file
 is chosen randomly from the matching sounds.
 
-When playing the sound "foomod_foosound", the sound is chosen randomly
+When playing the sound `foomod_foosound`, the sound is chosen randomly
 from the available ones of the following files:
-  foomod_foosound.ogg
-  foomod_foosound.0.ogg
-  foomod_foosound.1.ogg
-  ...
-  foomod_foosound.9.ogg
+
+* `foomod_foosound.ogg`
+* `foomod_foosound.0.ogg`
+* `foomod_foosound.1.ogg`
+* (...)
+* `foomod_foosound.9.ogg`
 
 Examples of sound parameter tables:
--- Play location-less on all clients
-{
-    gain = 1.0, -- default
-}
--- Play location-less to a player
-{
-    to_player = name,
-    gain = 1.0, -- default
-}
--- Play in a location
-{
-    pos = {x=1,y=2,z=3},
-    gain = 1.0, -- default
-    max_hear_distance = 32, -- default
-}
--- Play connected to an object, looped
-{
-    object = <an ObjectRef>,
-    gain = 1.0, -- default
-    max_hear_distance = 32, -- default
-    loop = true, -- only sounds connected to objects can be looped
-}
-
-SimpleSoundSpec:
-e.g. ""
-e.g. "default_place_node"
-e.g. {}
-e.g. {name="default_place_node"}
-e.g. {name="default_place_node", gain=1.0}
+
+    -- Play location-less on all clients
+    {
+        gain = 1.0, -- default
+    }
+    -- Play location-less to a player
+    {
+        to_player = name,
+        gain = 1.0, -- default
+    }
+    -- Play in a location
+    {
+        pos = {x=1,y=2,z=3},
+        gain = 1.0, -- default
+        max_hear_distance = 32, -- default
+    }
+    -- Play connected to an object, looped
+    {
+        object = <an ObjectRef>,
+        gain = 1.0, -- default
+        max_hear_distance = 32, -- default
+        loop = true, -- only sounds connected to objects can be looped
+    }
+
+### `SimpleSoundSpec`
+* e.g. `""`
+* e.g. `"default_place_node"`
+* e.g. `{}`
+* e.g. `{name="default_place_node"}`
+* e.g. `{name="default_place_node", gain=1.0}`
 
 Registered definitions of stuff
---------------------------------
-Anything added using certain minetest.register_* functions get added to
-the global minetest.registered_* tables.
+-------------------------------
+Anything added using certain `minetest.register_*` functions get added to
+the global `minetest.registered_*` tables.
 
-minetest.register_entity(name, prototype table)
- -> minetest.registered_entities[name]
+* `minetest.register_entity(name, prototype table)`
+    * added to `minetest.registered_entities[name]`
 
-minetest.register_node(name, node definition)
- -> minetest.registered_items[name]
- -> minetest.registered_nodes[name]
+* `minetest.register_node(name, node definition)`
+    * added to `minetest.registered_items[name]`
+    * added to `minetest.registered_nodes[name]`
 
-minetest.register_tool(name, item definition)
- -> minetest.registered_items[name]
+* `minetest.register_tool(name, item definition)`
+    * added to `minetest.registered_items[name]`
 
-minetest.register_craftitem(name, item definition)
- -> minetest.registered_items[name]
+* `minetest.register_craftitem(name, item definition)`
+    * added to `minetest.registered_items[name]`
 
 Note that in some cases you will stumble upon things that are not contained
 in these tables (e.g. when a mod has been removed). Always check for
@@ -348,186 +422,217 @@ existence before trying to access the fields.
 
 Example: If you want to check the drawtype of a node, you could do:
 
-local function get_nodedef_field(nodename, fieldname)
-    if not minetest.registered_nodes[nodename] then
-        return nil
+    local function get_nodedef_field(nodename, fieldname)
+        if not minetest.registered_nodes[nodename] then
+            return nil
+        end
+        return minetest.registered_nodes[nodename][fieldname]
     end
-    return minetest.registered_nodes[nodename][fieldname]
-end
-local drawtype = get_nodedef_field(nodename, "drawtype")
+    local drawtype = get_nodedef_field(nodename, "drawtype")
 
-Example: minetest.get_item_group(name, group) has been implemented as:
+Example: `minetest.get_item_group(name, group)` has been implemented as:
 
-function minetest.get_item_group(name, group)
-    if not minetest.registered_items[name] or not
-            minetest.registered_items[name].groups[group] then
-        return 0
+    function minetest.get_item_group(name, group)
+        if not minetest.registered_items[name] or not
+                minetest.registered_items[name].groups[group] then
+            return 0
+        end
+        return minetest.registered_items[name].groups[group]
     end
-    return minetest.registered_items[name].groups[group]
-end
 
 Nodes
-------
+-----
 Nodes are the bulk data of the world: cubes and other things that take the
 space of a cube. Huge amounts of them are handled efficiently, but they
 are quite static.
 
 The definition of a node is stored and can be accessed by name in
-  minetest.registered_nodes[node.name]
+
+    minetest.registered_nodes[node.name]
+
 See "Registered definitions of stuff".
 
 Nodes are passed by value between Lua and the engine.
 They are represented by a table:
-  {name="name", param1=num, param2=num}
 
-param1 and param2 are 8 bit integers. The engine uses them for certain
+    {name="name", param1=num, param2=num}
+
+`param1` and `param2` are 8-bit integers. The engine uses them for certain
 automated functions. If you don't use these functions, you can use them to
 store arbitrary values.
 
-The functions of param1 and param2 are determined by certain fields in the
+The functions of `param1` and `param2` are determined by certain fields in the
 node definition:
-param1 is reserved for the engine when paramtype != "none":
-  paramtype = "light"
-  ^ The value stores light with and without sun in it's
-    upper and lower 4 bits.
-param2 is reserved for the engine when any of these are used:
-  liquidtype == "flowing"
-  ^ The level and some flags of the liquid is stored in param2
-  drawtype == "flowingliquid"
-  ^ The drawn liquid level is read from param2
-  drawtype == "torchlike"
-  drawtype == "signlike"
-  paramtype2 == "wallmounted"
-  ^ The rotation of the node is stored in param2. You can make this value
-    by using minetest.dir_to_wallmounted().
-  paramtype2 == "facedir"
-  ^ The rotation of the node is stored in param2. Furnaces and chests are
-    rotated this way. Can be made by using minetest.dir_to_facedir().
-    Values range 0 - 23
-    facedir modulo 4 = axisdir
-    0 = y+    1 = z+    2 = z-    3 = x+    4 = x-    5 = y-
-    facedir's two less significant bits are rotation around the axis
-  paramtype2 == "leveled"
-  collision_box = {
-	type = "fixed",
-	fixed = {
-			{-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
-			},
-  },
-  ^ defines list of collision boxes for the node. If empty, collision boxes
-	will be the same as nodeboxes, in case of any other nodes will be full cube
-	as in the example above.
- 			
+
+`param1` is reserved for the engine when `paramtype != "none"`:
+
+    paramtype = "light"
+    ^ The value stores light with and without sun in it's
+      upper and lower 4 bits.
+
+`param2` is reserved for the engine when any of these are used:
+
+    liquidtype == "flowing"
+    ^ The level and some flags of the liquid is stored in param2
+    drawtype == "flowingliquid"
+    ^ The drawn liquid level is read from param2
+    drawtype == "torchlike"
+    drawtype == "signlike"
+    paramtype2 == "wallmounted"
+    ^ The rotation of the node is stored in param2. You can make this value
+      by using minetest.dir_to_wallmounted().
+    paramtype2 == "facedir"
+    ^ The rotation of the node is stored in param2. Furnaces and chests are
+      rotated this way. Can be made by using minetest.dir_to_facedir().
+      Values range 0 - 23
+      facedir modulo 4 = axisdir
+      0 = y+    1 = z+    2 = z-    3 = x+    4 = x-    5 = y-
+      facedir's two less significant bits are rotation around the axis
+    paramtype2 == "leveled"
+    collision_box = {
+      type = "fixed",
+      fixed = {
+                {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
+      },
+    },
+    ^ defines list of collision boxes for the node. If empty, collision boxes
+      will be the same as nodeboxes, in case of any other nodes will be full cube
+      as in the example above.
+
 Nodes can also contain extra data. See "Node Metadata".
 
 Node drawtypes
 ---------------
 There are a bunch of different looking node types.
 
-Look for examples in games/minimal or games/minetest_game.
-
-- normal
-- airlike
-- liquid
-- flowingliquid
-- glasslike
-- glasslike_framed
-- glasslike_framed_optional
-- allfaces
-- allfaces_optional
-- torchlike
-- signlike
-- plantlike
-- firelike
-- fencelike
-- raillike
-- nodebox -- See below. EXPERIMENTAL
-- mesh -- use models for nodes
-
-*_optional drawtypes need less rendering time if deactivated (always client side)
+Look for examples in `games/minimal` or `games/minetest_game`.
+
+* `normal`
+* `airlike`
+* `liquid`
+* `flowingliquid`
+* `glasslike`
+* `glasslike_framed`
+* `glasslike_framed_optional`
+* `allfaces`
+* `allfaces_optional`
+* `torchlike`
+* `signlike`
+* `plantlike`
+* `firelike`
+* `fencelike`
+* `raillike`
+* `nodebox` -- See below. (**Experimental!**)
+* `mesh` -- use models for nodes
+
+`*_optional` drawtypes need less rendering time if deactivated (always client side).
 
 Node boxes
 -----------
 Node selection boxes are defined using "node boxes"
 
-The "nodebox" node drawtype allows defining visual of nodes consisting of
+The `nodebox` node drawtype allows defining visual of nodes consisting of
 arbitrary number of boxes. It allows defining stuff like stairs. Only the
-"fixed" and "leveled" box type is supported for these.
-^ Please note that this is still experimental, and may be incompatibly
-  changed in the future.
+`fixed` and `leveled` box type is supported for these.
+
+Please note that this is still experimental, and may be incompatibly
+changed in the future.
 
 A nodebox is defined as any of:
-{
-    -- A normal cube; the default in most things
-    type = "regular"
-}
-{
-    -- A fixed box (facedir param2 is used, if applicable)
-    type = "fixed",
-    fixed = box OR {box1, box2, ...}
-}
-{
-    -- A box like the selection box for torches
-    -- (wallmounted param2 is used, if applicable)
-    type = "wallmounted",
-    wall_top = box,
-    wall_bottom = box,
-    wall_side = box
-}
-
-A box is defined as:
-  {x1, y1, z1, x2, y2, z2}
+
+    {
+        -- A normal cube; the default in most things
+        type = "regular"
+    }
+    {
+        -- A fixed box (facedir param2 is used, if applicable)
+        type = "fixed",
+        fixed = box OR {box1, box2, ...}
+    }
+    {
+        -- A box like the selection box for torches
+        -- (wallmounted param2 is used, if applicable)
+        type = "wallmounted",
+        wall_top = box,
+        wall_bottom = box,
+        wall_side = box
+    }
+
+A `box` is defined as:
+
+    {x1, y1, z1, x2, y2, z2}
+
 A box of a regular node would look like:
-  {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
 
-type = "leveled" is same as "fixed", but y2 will be automatically set to level from param2
+    {-0.5, -0.5, -0.5, 0.5, 0.5, 0.5},
+
+`type = "leveled"` is same as `type = "fixed"`, but `y2` will be automatically
+set to level from `param2`.
 
 
 Meshes
------------
-If drawtype "mesh" is used tiles should hold model materials textures.
-Only static meshes are implemented.
+------
+If drawtype `mesh` is used, tiles should hold model materials textures.
+Only static meshes are implemented.  
 For supported model formats see Irrlicht engine documentation.
 
 
 Noise Parameters
---------------------
-Noise Parameters, or commonly called NoiseParams, define the properties of perlin noise.
- - offset
-    Offset that the noise is translated by (i.e. added) after calculation.
- - scale
-    Factor that the noise is scaled by (i.e. multiplied) after calculation.
- - spread
-    Vector containing values by which each coordinate is divided by before calculation.
-    Higher spread values result in larger noise features.
-    A value of {x=250, y=250, z=250} is common.
- - seed
-    Random seed for the noise.  Add the world seed to a seed offset for world-unique noise.
-    In the case of minetest.get_perlin(), this value has the world seed automatically added.
- - octaves
-    Number of times the noise gradient is accumulated into the noise.
-    Increase this number to increase the amount of detail in the resulting noise.
-    A value of 6 is common.
- - persistence
-    Factor by which the effect of the noise gradient function changes with each successive octave.
-    Values less than 1 make the details of successive octaves' noise diminish, while values
-    greater than 1 make successive octaves stronger.
-    A value of 0.6 is common.
- - lacunarity
-    Factor by which the noise feature sizes change with each successive octave.
-    A value of 2.0 is common.
- - flags
-    Leave this field unset for no special handling.
-    Currently supported are:
-    - defaults
-       Specify this if you would like to keep auto-selection of eased/not-eased while specifying
-       some other flags.
-    - eased
-       Maps noise gradient values onto a quintic S-curve before performing interpolation.
-       This results in smooth, rolling noise.  Disable this ("noeased") for sharp-looking noise.
-       If no flags are specified (or defaults is), 2D noise is eased and 3D noise is not eased.
-    - absvalue
-       Accumulates the absolute value of each noise gradient result.
+----------------
+Noise Parameters, or commonly called "`NoiseParams`", define the properties of perlin noise.
+
+### `offset`
+Offset that the noise is translated by (i.e. added) after calculation.
+
+### `scale`
+Factor that the noise is scaled by (i.e. multiplied) after calculation.
+
+### `spread`
+Vector containing values by which each coordinate is divided by before calculation.
+Higher spread values result in larger noise features.
+
+A value of `{x=250, y=250, z=250}` is common.
+
+### `seed`
+Random seed for the noise. Add the world seed to a seed offset for world-unique noise.
+In the case of `minetest.get_perlin()`, this value has the world seed automatically added.
+
+### `octaves`
+Number of times the noise gradient is accumulated into the noise.
+
+Increase this number to increase the amount of detail in the resulting noise.
+
+A value of `6` is common.
+
+### `persistence`
+Factor by which the effect of the noise gradient function changes with each successive octave.
+
+Values less than `1` make the details of successive octaves' noise diminish, while values
+greater than `1` make successive octaves stronger.
+
+A value of `0.6` is common.
+
+### `lacunarity`
+Factor by which the noise feature sizes change with each successive octave.
+
+A value of `2.0` is common.
+
+### `flags`
+Leave this field unset for no special handling.
+
+Currently supported are `defaults`, `eased` and `absvalue`.
+
+#### `defaults`
+Specify this if you would like to keep auto-selection of eased/not-eased while specifying
+some other flags.
+
+#### `eased`
+Maps noise gradient values onto a quintic S-curve before performing interpolation.
+This results in smooth, rolling noise. Disable this (`noeased`) for sharp-looking noise.
+If no flags are specified (or defaults is), 2D noise is eased and 3D noise is not eased.
+
+#### `absvalue`
+Accumulates the absolute value of each noise gradient result.
 
 Noise parameters format example for 2D or 3D perlin noise or perlin noise maps:
     np_terrain = {
@@ -545,508 +650,592 @@ Noise parameters format example for 2D or 3D perlin noise or perlin noise maps:
 
 
 Ore types
----------------
+---------
 These tell in what manner the ore is generated.
+
 All default ores are of the uniformly-distributed scatter type.
 
- - scatter
-    Randomly chooses a location and generates a cluster of ore.
-    If noise_params is specified, the ore will be placed if the 3d perlin noise at
-    that point is greater than the noise_threshold, giving the ability to create a non-equal
-    distribution of ore.
- - sheet
-    Creates a sheet of ore in a blob shape according to the 2d perlin noise described by noise_params.
-    The relative height of the sheet can be controlled by the same perlin noise as well, by specifying
-    a non-zero 'scale' parameter in noise_params.  IMPORTANT: The noise is not transformed by offset or
-    scale when comparing against the noise threshold, but scale is used to determine relative height.
-    The height of the blob is randomly scattered, with a maximum height of clust_size.
-    clust_scarcity and clust_num_ores are ignored.
-    This is essentially an improved version of the so-called "stratus" ore seen in some unofficial mods.
- - blob
-    Creates a deformed sphere blobs of ore according to 3d perlin noise described by noise_params. The
-    maximum size of the blob is clust_size, and clust_scarcity has the same meaning as with scatter type.
- - vein
-    Creates veins of ore varying in density by according to the intersection of two instances 3d perlin
-    noise with diffferent seeds both described by noise_params.  random_factor varies the influence random
-    chance has on placement of an ore inside the vein, which is 1 by default.  Note that modifying this
-    parameter may require adjusting noise_threshhold.  The parameters clust_scarcity, clust_num_ores, and
-    clust_size are ignored by this ore type.  This ore type is difficult to control since it is sensitive
-    to small changes.  The following is a decent set of parameters to work from:
-    noise_params = {
-        offset  = 0,
-        scale   = 3,
-        spread  = {x=200, y=200, z=200},
-        seed    = 5390,
-        octaves = 4,
-        persist = 0.5,
-        flags = "eased",
-    },
-    noise_threshhold = 1.6
-    WARNING:  Use this ore type *very* sparingly since it is ~200x more computationally expensive than
-    any other ore.
+### `scatter`
+Randomly chooses a location and generates a cluster of ore.
+
+If `noise_params` is specified, the ore will be placed if the 3D perlin noise at
+that point is greater than the `noise_threshold`, giving the ability to create a non-equal
+distribution of ore.
+
+### `sheet`
+Creates a sheet of ore in a blob shape according to the 2D perlin noise described by `noise_params`.
+The relative height of the sheet can be controlled by the same perlin noise as well, by specifying
+a non-zero `scale` parameter in `noise_params`.
+
+**IMPORTANT**: The noise is not transformed by `offset` or `scale` when comparing against the noise
+threshold, but scale is used to determine relative height.  
+The height of the blob is randomly scattered, with a maximum height of `clust_size`.
+
+`clust_scarcity` and `clust_num_ores` are ignored.
+
+This is essentially an improved version of the so-called "stratus" ore seen in some unofficial mods.
+
+### `blob`
+Creates a deformed sphere of ore according to 3d perlin noise described by 
+`noise_params`.  The maximum size of the blob is `clust_size`, and
+`clust_scarcity` has the same meaning as with the `scatter` type.
+### `vein
+Creates veins of ore varying in density by according to the intersection of two
+instances of 3d perlin noise with diffferent seeds, both described by
+`noise_params`.  `random_factor` varies the influence random chance has on
+placement of an ore inside the vein, which is `1` by default. Note that
+modifying this parameter may require adjusting `noise_threshhold`.
+The parameters `clust_scarcity`, `clust_num_ores`, and `clust_size` are ignored
+by this ore type.  This ore type is difficult to control since it is sensitive
+to small changes.  The following is a decent set of parameters to work from:
+
+	noise_params = {
+	    offset  = 0,
+	    scale   = 3,
+	    spread  = {x=200, y=200, z=200},
+	    seed    = 5390,
+	    octaves = 4,
+	    persist = 0.5,
+	    flags = "eased",
+	},
+	noise_threshhold = 1.6
+
+WARNING:  Use this ore type *very* sparingly since it is ~200x more
+computationally expensive than any other ore.
 
 Ore attributes
--------------------
-See section Flag Specifier Format.
-Currently supported flags:  absheight
- - absheight
-    Also produce this same ore between the height range of -height_max and -height_min.
-    Useful for having ore in sky realms without having to duplicate ore entries.
+--------------
+See section "Flag Specifier Format".
+
+Currently supported flags: `absheight`
+
+### `absheight`
+Also produce this same ore between the height range of `-height_max` and `-height_min`.
+
+Useful for having ore in sky realms without having to duplicate ore entries.
 
 Decoration types
--------------------
+----------------
 The varying types of decorations that can be placed.
-The default value is simple, and is currently the only type supported.
 
-- simple
-    Creates a 1xHx1 column of a specified node (or a random node from a list, if a decoration
-    list is specified).  Can specify a certain node it must spawn next to, such as water or lava,
-    for example.  Can also generate a decoration of random height between a specified lower and
-    upper bound.  This type of decoration is intended for placement of grass, flowers, cacti,
-    papyrus, and so on.
-- schematic
-    Copies a box of MapNodes from a specified schematic file (or raw description).  Can specify a
-    probability of a node randomly appearing when placed.  This decoration type is intended to be used
-    for multi-node sized discrete structures, such as trees, cave spikes, rocks, and so on.
+The default value is `simple`, and is currently the only type supported.
+
+### `simple`
+Creates a 1 times `H` times 1 column of a specified node (or a random node from a list, if a
+decoration list is specified). Can specify a certain node it must spawn next to, such as water or
+lava, for example. Can also generate a decoration of random height between a specified lower and
+upper bound. This type of decoration is intended for placement of grass, flowers, cacti, papyri,
+and so on.
+
+### `schematic`
+Copies a box of `MapNodes` from a specified schematic file (or raw description). Can specify a
+probability of a node randomly appearing when placed.  This decoration type is intended to be used
+for multi-node sized discrete structures, such as trees, cave spikes, rocks, and so on.
 
 
 Schematic specifier
 --------------------
-    A schematic specifier identifies a schematic by either a filename to a Minetest Schematic file (.mts)
+A schematic specifier identifies a schematic by either a filename to a Minetest Schematic file (`.mts`)
 or through raw data supplied through Lua, in the form of a table.  This table must specify two fields:
- - The 'size' field is a 3d vector containing the dimensions of the provided schematic.
- - The 'data' field is a flat table of MapNodes making up the schematic, in the order of [z [y [x]]].
-Important:  The default value for param1 in MapNodes here is 255, which represents "always place".
 
-In the bulk MapNode data, param1, instead of the typical light values, instead represents the
+* The `size` field is a 3D vector containing the dimensions of the provided schematic.
+* The `data` field is a flat table of MapNodes making up the schematic, in the order of `[z [y [x]]]`.
+
+**Important**: The default value for `param1` in MapNodes here is `255`, which represents "always place".
+
+In the bulk `MapNode` data, `param1`, instead of the typical light values, instead represents the
 probability of that node appearing in the structure.
-When passed to minetest.create_schematic, probability is an integer value ranging from 0 to 255:
- - A probability value of 0 means that node will never appear (0% chance).
- - A probability value of 255 means the node will always appear (100% chance).
- - If the probability value p is greater than 0, then there is a (p / 256 * 100)% chance that node
-   will appear when the schematic is placed on the map.
 
-Important note: Node aliases cannot be used for a raw schematic provided when registering as a decoration.
+When passed to `minetest.create_schematic`, probability is an integer value ranging from `0` to `255`:
+
+* A probability value of `0` means that node will never appear (0% chance).
+* A probability value of `255` means the node will always appear (100% chance).
+* If the probability value `p` is greater than `0`, then there is a `(p / 256 * 100)`% chance that node
+  will appear when the schematic is placed on the map.
+
+**Important note**: Node aliases cannot be used for a raw schematic provided when registering as a decoration.
 
 
 Schematic attributes
----------------------
-See section Flag Specifier Format.
-Currently supported flags:  place_center_x, place_center_y, place_center_z
- - place_center_x
-    Placement of this decoration is centered along the X axis.
- - place_center_y
-    Placement of this decoration is centered along the Y axis.
- - place_center_z
-    Placement of this decoration is centered along the Z axis.
+--------------------
+See section "Flag Specifier Format".
+
+Currently supported flags: `place_center_x`, `place_center_y`, `place_center_z`.
+
+* `place_center_x`: Placement of this decoration is centered along the X axis.
+* `place_center_y`: Placement of this decoration is centered along the Y axis.
+* `place_center_z`: Placement of this decoration is centered along the Z axis.
 
 
 HUD element types
--------------------
+-----------------
 The position field is used for all element types.
+
 To account for differing resolutions, the position coordinates are the percentage of the screen,
-ranging in value from 0 to 1.
+ranging in value from `0` to `1`.
+
 The name field is not yet used, but should contain a description of what the HUD element represents.
 The direction field is the direction in which something is drawn.
-0 draws from left to right, 1 draws from right to left, 2 draws from top to bottom, and 3 draws from bottom to top.
-The alignment field specifies how the item will be aligned. It ranges from -1 to 1,
-with 0 being the center, -1 is moved to the left/up, and 1 is to the right/down. Fractional
-values can be used.
-The offset field specifies a pixel offset from the position. Contrary to position,
+
+`0` draws from left to right, `1` draws from right to left, `2` draws from top to bottom,
+and `3` draws from bottom to top.
+
+The `alignment` field specifies how the item will be aligned. It ranges from `-1` to `1`,
+with `0` being the center, `-1` is moved to the left/up, and `1` is to the right/down.
+Fractional values can be used.
+
+The `offset` field specifies a pixel offset from the position. Contrary to position,
 the offset is not scaled to screen size. This allows for some precisely-positioned
 items in the HUD.
-Note offset WILL adapt to screen dpi as well as user defined scaling factor!
+
+**Note**: `offset` _will_ adapt to screen DPI as well as user defined scaling factor!
+
 Below are the specific uses for fields in each type; fields not listed for that type are ignored.
 
-Note: Future revisions to the HUD API may be incompatible; the HUD API is still in the experimental stages.
-
-- image
-    Displays an image on the HUD.
-    - scale: The scale of the image, with 1 being the original texture size.
-             Only the X coordinate scale is used (positive values)
-             Negative values represent that percentage of the screen it
-             should take; e.g. x=-100 means 100% (width)
-    - text: The name of the texture that is displayed.
-    - alignment: The alignment of the image.
-    - offset: offset in pixels from position.
-- text
-    Displays text on the HUD.
-    - scale: Defines the bounding rectangle of the text.
-             A value such as {x=100, y=100} should work.
-    - text: The text to be displayed in the HUD element.
-    - number: An integer containing the RGB value of the color used to draw the text.
-              Specify 0xFFFFFF for white text, 0xFF0000 for red, and so on.
-    - alignment: The alignment of the text.
-    - offset: offset in pixels from position.
-- statbar
-    Displays a horizontal bar made up of half-images.
-    - text: The name of the texture that is used.
-    - number: The number of half-textures that are displayed.
-              If odd, will end with a vertically center-split texture.
-    - direction
-    - offset: offset in pixels from position.
-    - size: If used will force full-image size to this value (override texture pack image size)
-- inventory
-    - text: The name of the inventory list to be displayed.
-    - number: Number of items in the inventory to be displayed.
-    - item: Position of item that is selected.
-    - direction
-- waypoint
-	Displays distance to selected world position.
-    - name: The name of the waypoint.
-    - text: Distance suffix. Can be blank.
-    - number: An integer containing the RGB value of the color used to draw the text.
-    - world_pos: World position of the waypoint.
+**Note**: Future revisions to the HUD API may be incompatible; the HUD API is still in the experimental stages.
+
+### `image`
+Displays an image on the HUD.
+
+* `scale`: The scale of the image, with 1 being the original texture size.
+  Only the X coordinate scale is used (positive values).
+  Negative values represent that percentage of the screen it
+  should take; e.g. `x=-100` means 100% (width).
+* `text`: The name of the texture that is displayed.
+* `alignment`: The alignment of the image.
+* `offset`: offset in pixels from position.
+
+### `text`
+Displays text on the HUD.
+
+* `scale`: Defines the bounding rectangle of the text.
+  A value such as `{x=100, y=100}` should work.
+* `text`: The text to be displayed in the HUD element.
+* `number`: An integer containing the RGB value of the color used to draw the text.
+  Specify `0xFFFFFF` for white text, `0xFF0000` for red, and so on.
+* `alignment`: The alignment of the text.
+* `offset`: offset in pixels from position.
+
+### `statbar`
+Displays a horizontal bar made up of half-images.
+
+* `text`: The name of the texture that is used.
+* `number`: The number of half-textures that are displayed.
+  If odd, will end with a vertically center-split texture.
+* `direction`
+* `offset`: offset in pixels from position.
+* `size`: If used, will force full-image size to this value (override texture pack image size)
+
+### `inventory`
+* `text`: The name of the inventory list to be displayed.
+* `number`: Number of items in the inventory to be displayed.
+* `item`: Position of item that is selected.
+* `direction`
+
+### `waypoint`
+Displays distance to selected world position.
+
+* `name`: The name of the waypoint.
+* `text`: Distance suffix. Can be blank.
+* `number:` An integer containing the RGB value of the color used to draw the text.
+* `world_pos`: World position of the waypoint.
 
 Representations of simple things
 --------------------------------
-Position/vector:
-  {x=num, y=num, z=num}
+
+### Position/vector
+
+    {x=num, y=num, z=num}
+
 For helper functions see "Vector helpers".
 
-pointed_thing:
-  {type="nothing"}
-  {type="node", under=pos, above=pos}
-  {type="object", ref=ObjectRef}
+### `pointed_thing`
+* `{type="nothing"}`
+* `{type="node", under=pos, above=pos}`
+* `{type="object", ref=ObjectRef}`
 
 Flag Specifier Format
------------------------
+---------------------
 Flags using the standardized flag specifier format can be specified in either of two ways, by string or table.
+
 The string format is a comma-delimited set of flag names; whitespace and unrecognized flag fields are ignored.
-Specifying a flag in the string sets the flag, and specifying a flag prefixed by the string "no" explicitly
+Specifying a flag in the string sets the flag, and specifying a flag prefixed by the string `"no"` explicitly
 clears the flag from whatever the default may be.
+
 In addition to the standard string flag format, the schematic flags field can also be a table of flag names
-to boolean values representing whether or not the flag is set.  Additionally, if a field with the flag name
-prefixed with "no" is present, mapped to a boolean of any value, the specified flag is unset.
+to boolean values representing whether or not the flag is set. Additionally, if a field with the flag name
+prefixed with `"no"` is present, mapped to a boolean of any value, the specified flag is unset.
+
+E.g. A flag field of value
+
+    {place_center_x = true, place_center_y=false, place_center_z=true}
 
-e.g. A flag field of value
-  {place_center_x = true, place_center_y=false, place_center_z=true}
 is equivalent to
-  {place_center_x = true, noplace_center_y=true, place_center_z=true}
+
+    {place_center_x = true, noplace_center_y=true, place_center_z=true}
+
 which is equivalent to
-  "place_center_x, noplace_center_y, place_center_z"
+
+    "place_center_x, noplace_center_y, place_center_z"
+
 or even
-  "place_center_x, place_center_z"
+
+    "place_center_x, place_center_z"
+
 since, by default, no schematic attributes are set.
 
 Items
-------
-Node (register_node):
-  A node from the world
-Tool (register_tool):
-  A tool/weapon that can dig and damage things according to tool_capabilities
-Craftitem (register_craftitem):
-  A miscellaneous item
-
-Items and item stacks can exist in three formats:
-
-Serialized; This is called stackstring or itemstring:
-e.g. 'default:dirt 5'
-e.g. 'default:pick_wood 21323'
-e.g. 'default:apple'
-
-Table format:
-e.g. {name="default:dirt", count=5, wear=0, metadata=""}
-    ^ 5 dirt nodes
-e.g. {name="default:pick_wood", count=1, wear=21323, metadata=""}
-    ^ a wooden pick about 1/3 worn out
-e.g. {name="default:apple", count=1, wear=0, metadata=""}
-    ^ an apple.
-
-ItemStack:
-C++ native format with many helper methods. Useful for converting between
-formats. See the Class reference section for details.
+-----
+
+### Item types
+There are three kinds of items: nodes, tools and craftitems.
+
+* Node (`register_node`): A node from the world.
+* Tool (`register_tool`): A tool/weapon that can dig and damage
+  things according to `tool_capabilities`.
+* Craftitem (`register_craftitem`): A miscellaneous item.
+
+### Item formats
+Items and item stacks can exist in three formats: Serializes, table format
+and `ItemStack`.
+
+#### Serialized
+This is called "stackstring" or "itemstring":
+
+* e.g. `'default:dirt 5'`
+* e.g. `'default:pick_wood 21323'`
+* e.g. `'default:apple'`
+
+#### Table format
+Examples:
+
+5 dirt nodes:
+
+    {name="default:dirt", count=5, wear=0, metadata=""}
+
+A wooden pick about 1/3 worn out:
+
+    {name="default:pick_wood", count=1, wear=21323, metadata=""}
+
+An apple:
+
+    {name="default:apple", count=1, wear=0, metadata=""}
+
+#### `ItemStack`
+A native C++ format with many helper methods. Useful for converting
+between formats. See the Class reference section for details.
 
 When an item must be passed to a function, it can usually be in any of
 these formats.
 
+
 Groups
--------
+------
 In a number of places, there is a group table. Groups define the
 properties of a thing (item, node, armor of entity, capabilities of
 tool) in such a way that the engine and other mods can can interact with
 the thing without actually knowing what the thing is.
 
-Usage:
-- Groups are stored in a table, having the group names with keys and the
-  group ratings as values. For example:
+### Usage
+Groups are stored in a table, having the group names with keys and the
+group ratings as values. For example:
+
     groups = {crumbly=3, soil=1}
-    ^ Default dirt
+    -- ^ Default dirt
+
     groups = {crumbly=2, soil=1, level=2, outerspace=1}
-    ^ A more special dirt-kind of thing
-- Groups always have a rating associated with them. If there is no
-  useful meaning for a rating for an enabled group, it shall be 1.
-- When not defined, the rating of a group defaults to 0. Thus when you
-  read groups, you must interpret nil and 0 as the same value, 0.
+    -- ^ A more special dirt-kind of thing
+
+Groups always have a rating associated with them. If there is no
+useful meaning for a rating for an enabled group, it shall be `1`.
+
+When not defined, the rating of a group defaults to `0`. Thus when you
+read groups, you must interpret `nil` and `0` as the same value, `0`.
 
 You can read the rating of a group for an item or a node by using
-  minetest.get_item_group(itemname, groupname)
 
-Groups of items
-----------------
+    minetest.get_item_group(itemname, groupname)
+
+### Groups of items
 Groups of items can define what kind of an item it is (e.g. wool).
 
-Groups of nodes
-----------------
+### Groups of nodes
 In addition to the general item things, groups are used to define whether
 a node is destroyable and how long it takes to destroy by a tool.
 
-Groups of entities
--------------------
+### Groups of entities
 For entities, groups are, as of now, used only for calculating damage.
 The rating is the percentage of damage caused by tools with this damage group.
 See "Entity damage mechanism".
 
-object.get_armor_groups() -> a group-rating table (e.g. {fleshy=100})
-object.set_armor_groups({fleshy=30, cracky=80})
+    object.get_armor_groups() --> a group-rating table (e.g. {fleshy=100})
+    object.set_armor_groups({fleshy=30, cracky=80})
 
-Groups of tools
-----------------
+### Groups of tools
 Groups in tools define which groups of nodes and entities they are
 effective towards.
 
-Groups in crafting recipes
----------------------------
-An example: Make meat soup from any meat, any water and any bowl
-{
-    output = 'food:meat_soup_raw',
-    recipe = {
-        {'group:meat'},
-        {'group:water'},
-        {'group:bowl'},
-    },
-    -- preserve = {'group:bowl'}, -- Not implemented yet (TODO)
-}
-An another example: Make red wool from white wool and red dye
-{
-    type = 'shapeless',
-    output = 'wool:red',
-    recipe = {'wool:white', 'group:dye,basecolor_red'},
-}
-
-Special groups
----------------
-- immortal: Disables the group damage system for an entity
-- level: Can be used to give an additional sense of progression in the game.
-  - A larger level will cause e.g. a weapon of a lower level make much less
-    damage, and get worn out much faster, or not be able to get drops
-    from destroyed nodes.
-  - 0 is something that is directly accessible at the start of gameplay
-  - There is no upper limit
-- dig_immediate: (player can always pick up node without tool wear)
-  - 2: node is removed without tool wear after 0.5 seconds or so
-       (rail, sign)
-  - 3: node is removed without tool wear immediately (torch)
-- disable_jump: Player (and possibly other things) cannot jump from node
-- fall_damage_add_percent: damage speed = speed * (1 + value/100)
-- bouncy: value is bounce speed in percent
-- falling_node: if there is no walkable block under the node it will fall
-- attached_node: if the node under it is not a walkable block the node will be
-                  dropped as an item. If the node is wallmounted the
-                  wallmounted direction is checked.
-- soil: saplings will grow on nodes in this group
-- connect_to_raillike: makes nodes of raillike drawtype connect to
-                       other group members with same drawtype
-
-Known damage and digging time defining groups
-----------------------------------------------
-- crumbly: dirt, sand
-- cracky: tough but crackable stuff like stone.
-- snappy: something that can be cut using fine tools; e.g. leaves, small
-          plants, wire, sheets of metal
-- choppy: something that can be cut using force; e.g. trees, wooden planks
-- fleshy: Living things like animals and the player. This could imply
-          some blood effects when hitting.
-- explody: Especially prone to explosions
-- oddly_breakable_by_hand:
+### Groups in crafting recipes
+An example: Make meat soup from any meat, any water and any bowl:
+
+    {
+        output = 'food:meat_soup_raw',
+        recipe = {
+            {'group:meat'},
+            {'group:water'},
+            {'group:bowl'},
+        },
+        -- preserve = {'group:bowl'}, -- Not implemented yet (TODO)
+    }
+
+Another example: Make red wool from white wool and red dye:
+
+    {
+        type = 'shapeless',
+        output = 'wool:red',
+        recipe = {'wool:white', 'group:dye,basecolor_red'},
+    }
+
+### Special groups
+* `immortal`: Disables the group damage system for an entity
+* `level`: Can be used to give an additional sense of progression in the game.
+     * A larger level will cause e.g. a weapon of a lower level make much less
+       damage, and get worn out much faster, or not be able to get drops
+       from destroyed nodes.
+     * `0` is something that is directly accessible at the start of gameplay
+     * There is no upper limit
+* `dig_immediate`: (player can always pick up node without tool wear)
+    * `2`: node is removed without tool wear after 0.5 seconds or so
+      (rail, sign)
+    * `3`: node is removed without tool wear immediately (torch)
+* `disable_jump`: Player (and possibly other things) cannot jump from node
+* `fall_damage_add_percent`: damage speed = `speed * (1 + value/100)`
+* `bouncy`: value is bounce speed in percent
+* `falling_node`: if there is no walkable block under the node it will fall
+* `attached_node`: if the node under it is not a walkable block the node will be
+  dropped as an item. If the node is wallmounted the wallmounted direction is
+  checked.
+* `soil`: saplings will grow on nodes in this group
+* `connect_to_raillike`: makes nodes of raillike drawtype connect to
+  other group members with same drawtype
+
+### Known damage and digging time defining groups
+* `crumbly`: dirt, sand
+* `cracky`: tough but crackable stuff like stone.
+* `snappy`: something that can be cut using fine tools; e.g. leaves, small
+  plants, wire, sheets of metal
+* `choppy`: something that can be cut using force; e.g. trees, wooden planks
+* `fleshy`: Living things like animals and the player. This could imply
+  some blood effects when hitting.
+* `explody`: Especially prone to explosions
+* `oddly_breakable_by_hand`:
    Can be added to nodes that shouldn't logically be breakable by the
-   hand but are. Somewhat similar to dig_immediate, but times are more
-   like {[1]=3.50,[2]=2.00,[3]=0.70} and this does not override the
+   hand but are. Somewhat similar to `dig_immediate`, but times are more
+   like `{[1]=3.50,[2]=2.00,[3]=0.70}` and this does not override the
    speed of a tool if the tool can dig at a faster speed than this
    suggests for the hand.
 
-Examples of custom groups
---------------------------
-Item groups are often used for defining, well, //groups of items//.
-- meat: any meat-kind of a thing (rating might define the size or healing
-  ability or be irrelevant - it is not defined as of yet)
-- eatable: anything that can be eaten. Rating might define HP gain in half
+### Examples of custom groups
+Item groups are often used for defining, well, _groups of items_.
+* `meat`: any meat-kind of a thing (rating might define the size or healing
+  ability or be irrelevant -- it is not defined as of yet)
+* `eatable`: anything that can be eaten. Rating might define HP gain in half
   hearts.
-- flammable: can be set on fire. Rating might define the intensity of the
+* `flammable`: can be set on fire. Rating might define the intensity of the
   fire, affecting e.g. the speed of the spreading of an open fire.
-- wool: any wool (any origin, any color)
-- metal: any metal
-- weapon: any weapon
-- heavy: anything considerably heavy
-
-Digging time calculation specifics
------------------------------------
-Groups such as **crumbly**, **cracky** and **snappy** are used for this
-purpose. Rating is 1, 2 or 3. A higher rating for such a group implies
+* `wool`: any wool (any origin, any color)
+* `metal`: any metal
+* `weapon`: any weapon
+* `heavy`: anything considerably heavy
+
+### Digging time calculation specifics
+Groups such as `crumbly`, `cracky` and `snappy` are used for this
+purpose. Rating is `1`, `2` or `3`. A higher rating for such a group implies
 faster digging time.
 
-The **level** group is used to limit the toughness of nodes a tool can dig
+The `level` group is used to limit the toughness of nodes a tool can dig
 and to scale the digging times / damage to a greater extent.
 
-^ PLEASE DO UNDERSTAND THIS, otherwise you cannot use the system to it's
-  full potential.
+**Please do understand this**, otherwise you cannot use the system to it's
+full potential.
 
 Tools define their properties by a list of parameters for groups. They
 cannot dig other groups; thus it is important to use a standard bunch of
 groups to enable interaction with tools.
 
-**Tools define:**
-  * Full punch interval
-  * Maximum drop level
-  * For an arbitrary list of groups:
+#### Tools definition
+Tools define:
+
+* Full punch interval
+* Maximum drop level
+* For an arbitrary list of groups:
     * Uses (until the tool breaks)
-    * Maximum level (usually 0, 1, 2 or 3)
-    * Digging times
-    * Damage groups
+        * Maximum level (usually `0`, `1`, `2` or `3`)
+        * Digging times
+        * Damage groups
 
-**Full punch interval**:
+#### Full punch interval
 When used as a weapon, the tool will do full damage if this time is spent
 between punches. If e.g. half the time is spent, the tool will do half
 damage.
 
-**Maximum drop level**
+#### Maximum drop level
 Suggests the maximum level of node, when dug with the tool, that will drop
 it's useful item. (e.g. iron ore to drop a lump of iron).
-- This is not automated; it is the responsibility of the node definition
-  to implement this
 
-**Uses**
+This is not automated; it is the responsibility of the node definition
+to implement this.
+
+#### Uses
 Determines how many uses the tool has when it is used for digging a node,
 of this group, of the maximum level. For lower leveled nodes, the use count
-is multiplied by 3^leveldiff.
-- uses=10, leveldiff=0 -> actual uses: 10
-- uses=10, leveldiff=1 -> actual uses: 30
-- uses=10, leveldiff=2 -> actual uses: 90
+is multiplied by `3^leveldiff`.
+
+* `uses=10, leveldiff=0`: actual uses: 10
+* `uses=10, leveldiff=1`: actual uses: 30
+* `uses=10, leveldiff=2`: actual uses: 90
 
-**Maximum level**
+#### Maximum level
 Tells what is the maximum level of a node of this group that the tool will
 be able to dig.
 
-**Digging times**
+#### Digging times
 List of digging times for different ratings of the group, for nodes of the
 maximum level.
-  * For example, as a Lua table, ''times={2=2.00, 3=0.70}''. This would
-    result in the tool to be able to dig nodes that have a rating of 2 or 3
-    for this group, and unable to dig the rating 1, which is the toughest.
-    Unless there is a matching group that enables digging otherwise.
 
-**Damage groups**
+For example, as a Lua table, `times={2=2.00, 3=0.70}`. This would
+result in the tool to be able to dig nodes that have a rating of `2` or `3`
+for this group, and unable to dig the rating `1`, which is the toughest.
+Unless there is a matching group that enables digging otherwise.
+
+#### Damage groups
 List of damage for groups of entities. See "Entity damage mechanism".
 
-Example definition of the capabilities of a tool
--------------------------------------------------
-tool_capabilities = {
-    full_punch_interval=1.5,
-    max_drop_level=1,
-    groupcaps={
-        crumbly={maxlevel=2, uses=20, times={[1]=1.60, [2]=1.20, [3]=0.80}}
+#### Example definition of the capabilities of a tool
+
+    tool_capabilities = {
+        full_punch_interval=1.5,
+        max_drop_level=1,
+        groupcaps={
+            crumbly={maxlevel=2, uses=20, times={[1]=1.60, [2]=1.20, [3]=0.80}}
+        }
+        damage_groups = {fleshy=2},
     }
-    damage_groups = {fleshy=2},
-}
 
 This makes the tool be able to dig nodes that fulfil both of these:
-- Have the **crumbly** group
-- Have a **level** group less or equal to 2
+
+* Have the `crumbly` group
+* Have a `level` group less or equal to `2`
 
 Table of resulting digging times:
-crumbly        0     1     2     3     4  <- level
-     ->  0     -     -     -     -     -
-         1  0.80  1.60  1.60     -     -
-         2  0.60  1.20  1.20     -     -
-         3  0.40  0.80  0.80     -     -
 
-level diff:    2     1     0    -1    -2
+    crumbly        0     1     2     3     4  <- level
+         ->  0     -     -     -     -     -
+             1  0.80  1.60  1.60     -     -
+             2  0.60  1.20  1.20     -     -
+             3  0.40  0.80  0.80     -     -
+
+    level diff:    2     1     0    -1    -2
 
 Table of resulting tool uses:
-     ->  0     -     -     -     -     -
-         1   180    60    20     -     -
-         2   180    60    20     -     -
-         3   180    60    20     -     -
-
-Notes:
-- At crumbly=0, the node is not diggable.
-- At crumbly=3, the level difference digging time divider kicks in and makes
+
+    ->  0     -     -     -     -     -
+        1   180    60    20     -     -
+        2   180    60    20     -     -
+        3   180    60    20     -     -
+
+**Notes**:
+
+* At `crumbly==0`, the node is not diggable.
+* At `crumbly==3`, the level difference digging time divider kicks in and makes
   easy nodes to be quickly breakable.
-- At level > 2, the node is not diggable, because it's level > maxlevel
+* At `level > 2`, the node is not diggable, because it's `level > maxlevel`
 
 Entity damage mechanism
-------------------------
+-----------------------
 Damage calculation:
-damage = 0
-foreach group in cap.damage_groups:
-    damage += cap.damage_groups[group] * limit(actual_interval / cap.full_punch_interval, 0.0, 1.0)
-        * (object.armor_groups[group] / 100.0)
-        -- Where object.armor_groups[group] is 0 for inexistent values
-return damage
+
+    damage = 0
+    foreach group in cap.damage_groups:
+        damage += cap.damage_groups[group] * limit(actual_interval / cap.full_punch_interval, 0.0, 1.0)
+            * (object.armor_groups[group] / 100.0)
+            -- Where object.armor_groups[group] is 0 for inexistent values
+    return damage
 
 Client predicts damage based on damage groups. Because of this, it is able to
 give an immediate response when an entity is damaged or dies; the response is
 pre-defined somehow (e.g. by defining a sprite animation) (not implemented;
-TODO).
-- Currently a smoke puff will appear when an entity dies.
+TODO).  
+Currently a smoke puff will appear when an entity dies.
 
-The group **immortal** completely disables normal damage.
+The group `immortal` completely disables normal damage.
 
-Entities can define a special armor group, which is **punch_operable**. This
+Entities can define a special armor group, which is `punch_operable`. This
 group disables the regular damage mechanism for players punching it by hand or
 a non-tool item, so that it can do something else than take damage.
 
-On the Lua side, every punch calls ''entity:on_punch(puncher,
-time_from_last_punch, tool_capabilities, direction)''. This should never be
-called directly, because damage is usually not handled by the entity itself.
-  * ''puncher'' is the object performing the punch. Can be nil. Should never be
-    accessed unless absolutely required, to encourage interoperability.
-  * ''time_from_last_punch'' is time from last punch (by puncher) or nil.
-  * ''tool_capabilities'' can be nil.
-  * ''direction'' is a unit vector, pointing from the source of the punch to
-    the punched object.
-
-To punch an entity/object in Lua, call ''object:punch(puncher,
-time_from_last_punch, tool_capabilities, direction)''.
-  * Return value is tool wear.
-  * Parameters are equal to the above callback.
-  * If ''direction'' is nil and ''puncher'' is not nil, ''direction'' will be
-    automatically filled in based on the location of ''puncher''.
+On the Lua side, every punch calls:
+
+    entity:on_punch(puncher, time_from_last_punch, tool_capabilities, direction)
+
+This should never be called directly, because damage is usually not handled by the entity
+itself.
+
+* `puncher` is the object performing the punch. Can be `nil`. Should never be
+  accessed unless absolutely required, to encourage interoperability.
+* `time_from_last_punch` is time from last punch (by `puncher`) or `nil`.
+* `tool_capabilities` can be `nil`.
+* `direction` is a unit vector, pointing from the source of the punch to
+   the punched object.
+
+To punch an entity/object in Lua, call:
+
+    object:punch(puncher, time_from_last_punch, tool_capabilities, direction)
+
+* Return value is tool wear.
+* Parameters are equal to the above callback.
+* If `direction` equals `nil` and `puncher` does not equal `nil`,
+  `direction` will be automatically filled in based on the location of `puncher`.
 
 Node Metadata
 -------------
 The instance of a node in the world normally only contains the three values
 mentioned in "Nodes". However, it is possible to insert extra data into a
-node. It is called "node metadata"; See "NodeMetaRef".
+node. It is called "node metadata"; See "`NodeMetaRef`".
 
 Metadata contains two things:
-- A key-value store
-- An inventory
+* A key-value store
+* An inventory
 
 Some of the values in the key-value store are handled specially:
-- formspec: Defines a right-click inventory menu. See "Formspec".
-- infotext: Text shown on the screen when the node is pointed at
+* `formspec`: Defines a right-click inventory menu. See "Formspec".
+* `infotext`: Text shown on the screen when the node is pointed at
 
 Example stuff:
 
-local meta = minetest.get_meta(pos)
-meta:set_string("formspec",
-        "size[8,9]"..
-        "list[context;main;0,0;8,4;]"..
-        "list[current_player;main;0,5;8,4;]")
-meta:set_string("infotext", "Chest");
-local inv = meta:get_inventory()
-inv:set_size("main", 8*4)
-print(dump(meta:to_table()))
-meta:from_table({
-    inventory = {
-        main = {[1] = "default:dirt", [2] = "", [3] = "", [4] = "", [5] = "", [6] = "", [7] = "", [8] = "", [9] = "", [10] = "", [11] = "", [12] = "", [13] = "", [14] = "default:cobble", [15] = "", [16] = "", [17] = "", [18] = "", [19] = "", [20] = "default:cobble", [21] = "", [22] = "", [23] = "", [24] = "", [25] = "", [26] = "", [27] = "", [28] = "", [29] = "", [30] = "", [31] = "", [32] = ""}
-    },
-    fields = {
-        formspec = "size[8,9]list[context;main;0,0;8,4;]list[current_player;main;0,5;8,4;]",
-        infotext = "Chest"
-    }
-})
+    local meta = minetest.get_meta(pos)
+    meta:set_string("formspec",
+            "size[8,9]"..
+            "list[context;main;0,0;8,4;]"..
+            "list[current_player;main;0,5;8,4;]")
+    meta:set_string("infotext", "Chest");
+    local inv = meta:get_inventory()
+    inv:set_size("main", 8*4)
+    print(dump(meta:to_table()))
+    meta:from_table({
+        inventory = {
+            main = {[1] = "default:dirt", [2] = "", [3] = "", [4] = "", [5] = "", [6] = "",
+                    [7] = "", [8] = "", [9] = "", [10] = "", [11] = "", [12] = "", [13] = "",
+                    [14] = "default:cobble", [15] = "", [16] = "", [17] = "", [18] = "",
+                    [19] = "", [20] = "default:cobble", [21] = "", [22] = "", [23] = "",
+                    [24] = "", [25] = "", [26] = "", [27] = "", [28] = "", [29] = "", [30] = "",
+                    [31] = "", [32] = ""}
+        },
+        fields = {
+            formspec = "size[8,9]list[context;main;0,0;8,4;]list[current_player;main;0,5;8,4;]",
+            infotext = "Chest"
+        }
+    })
 
 Formspec
 --------
@@ -1056,1864 +1245,1978 @@ supported. It is a string, with a somewhat strange format.
 Spaces and newlines can be inserted between the blocks, as is used in the
 examples.
 
-Examples:
-- Chest:
+### Examples
+
+#### Chest
+
     size[8,9]
     list[context;main;0,0;8,4;]
     list[current_player;main;0,5;8,4;]
-- Furnace:
+
+#### Furnace
+
     size[8,9]
     list[context;fuel;2,3;1,1;]
     list[context;src;2,1;1,1;]
     list[context;dst;5,1;2,2;]
     list[current_player;main;0,5;8,4;]
-- Minecraft-like player inventory
+
+#### Minecraft-like player inventory
+
     size[8,7.5]
     image[1,0.6;1,2;player.png]
     list[current_player;main;0,3.5;8,4;]
     list[current_player;craft;3,0;3,3;]
     list[current_player;craftpreview;7,1;1,1;]
 
-Elements:
-
-size[<W>,<H>,<fixed_size>]
-^ Define the size of the menu in inventory slots
-^ fixed_size true/false (optional)
-^ deprecated: invsize[<W>,<H>;]
-
-list[<inventory location>;<list name>;<X>,<Y>;<W>,<H>;]
-list[<inventory location>;<list name>;<X>,<Y>;<W>,<H>;<starting item index>]
-^ Show an inventory list
-
-listcolors[<slot_bg_normal>;<slot_bg_hover>]
-^ Sets background color of slots as ColorString
-^ Sets background color of slots on mouse hovering
-
-listcolors[<slot_bg_normal>;<slot_bg_hover>;<slot_border>]
-^ Sets background color of slots as ColorString
-^ Sets background color of slots on mouse hovering
-^ Sets color of slots border
-
-listcolors[<slot_bg_normal>;<slot_bg_hover>;<slot_border>;<tooltip_bgcolor>;<tooltip_fontcolor>]
-^ Sets background color of slots as ColorString
-^ Sets background color of slots on mouse hovering
-^ Sets color of slots border
-^ Sets default background color of tooltips
-^ Sets default font color of tooltips
-
-tooltip[<gui_element_name>;<tooltip_text>;<bgcolor>,<fontcolor>]
-^ Adds tooltip for an element
-^ <bgcolor> tooltip background color as ColorString (optional)
-^ <fontcolor> tooltip font color as ColorString (optional)
-
-
-image[<X>,<Y>;<W>,<H>;<texture name>]
-^ Show an image
-^ Position and size units are inventory slots
-
-item_image[<X>,<Y>;<W>,<H>;<item name>]
-^ Show an inventory image of registered item/node
-^ Position and size units are inventory slots
-
-bgcolor[<color>;<fullscreen>]
-^ Sets background color of formspec as ColorString
-^ If true the background color is drawn fullscreen (does not effect the size of the formspec)
-
-background[<X>,<Y>;<W>,<H>;<texture name>]
-^ Use a background. Inventory rectangles are not drawn then.
-^ Position and size units are inventory slots
-^ Example for formspec 8x4 in 16x resolution: image shall be sized 8*16px x 4*16px
-
-background[<X>,<Y>;<W>,<H>;<texture name>;<auto_clip>]
-^ Use a background. Inventory rectangles are not drawn then.
-^ Position and size units are inventory slots
-^ Example for formspec 8x4 in 16x resolution: image shall be sized 8*16px x 4*16px
-^ If true the background is clipped to formspec size (x and y are used as offset values, w and h are ignored)
-
-pwdfield[<X>,<Y>;<W>,<H>;<name>;<label>]
-^ Textual password style field; will be sent to server when a button is clicked
-^ x and y position the field relative to the top left of the menu
-^ w and h are the size of the field
-^ fields are a set height, but will be vertically centred on h
-^ Position and size units are inventory slots
-^ name is the name of the field as returned in fields to on_receive_fields
-^ label, if not blank, will be text printed on the top left above the field
-
-field[<X>,<Y>;<W>,<H>;<name>;<label>;<default>]
-^ Textual field; will be sent to server when a button is clicked
-^ x and y position the field relative to the top left of the menu
-^ w and h are the size of the field
-^ fields are a set height, but will be vertically centred on h
-^ Position and size units are inventory slots
-^ name is the name of the field as returned in fields to on_receive_fields
-^ label, if not blank, will be text printed on the top left above the field
-^ default is the default value of the field
-  ^ default may contain variable references such as '${text}' which
-    will fill the value from the metadata value 'text'
-    ^ Note: no extra text or more than a single variable is supported ATM.
-
-field[<name>;<label>;<default>]
-^ as above but without position/size units
-^ special field for creating simple forms, such as sign text input
-^ must be used without a size[] element
-^ a 'Proceed' button will be added automatically
-
-textarea[<X>,<Y>;<W>,<H>;<name>;<label>;<default>]
-^ same as fields above, but with multi-line input
-
-label[<X>,<Y>;<label>]
-^ x and y work as per field
-^ label is the text on the label
-^ Position and size units are inventory slots
-
-vertlabel[<X>,<Y>;<label>]
-^ Textual label drawn vertically
-^ x and y work as per field
-^ label is the text on the label
-^ Position and size units are inventory slots
-
-button[<X>,<Y>;<W>,<H>;<name>;<label>]
-^ Clickable button. When clicked, fields will be sent.
-^ x, y and name work as per field
-^ w and h are the size of the button
-^ label is the text on the button
-^ Position and size units are inventory slots
-
-image_button[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>]
-^ x, y, w, h, and name work as per button
-^ texture name is the filename of an image
-^ Position and size units are inventory slots
-
-image_button[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>;<noclip>;<drawborder>;<pressed texture name>]
-^ x, y, w, h, and name work as per button
-^ texture name is the filename of an image
-^ Position and size units are inventory slots
-^ noclip=true means imagebutton doesn't need to be within specified formsize
-^ drawborder draw button border or not
-^ pressed texture name is the filename of an image on pressed state
-
-item_image_button[<X>,<Y>;<W>,<H>;<item name>;<name>;<label>]
-^ x, y, w, h, name and label work as per button
-^ item name is the registered name of an item/node,
-  tooltip will be made out of its description
-  to override it use tooltip element
-^ Position and size units are inventory slots
-
-button_exit[<X>,<Y>;<W>,<H>;<name>;<label>]
-^ When clicked, fields will be sent and the form will quit.
-
-image_button_exit[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>]
-^ When clicked, fields will be sent and the form will quit.
-
-textlist[<X>,<Y>;<W>,<H>;<name>;<listelem 1>,<listelem 2>,...,<listelem n>]
-^ Scrollable item list showing arbitrary text elements
-^ x and y position the itemlist relative to the top left of the menu
-^ w and h are the size of the itemlist
-^ name fieldname sent to server on doubleclick value is current selected element
-^ listelements can be prepended by #color in hexadecimal format RRGGBB (only),
-^    if you want a listelement to start with # write ##
-
-textlist[<X>,<Y>;<W>,<H>;<name>;<listelem 1>,<listelem 2>,...,<listelem n>;<selected idx>;<transparent>]
-^ Scrollable itemlist showing arbitrary text elements
-^ x and y position the itemlist relative to the top left of the menu
-^ w and h are the size of the itemlist
-^ name fieldname sent to server on doubleclick value is current selected element
-^ listelements can be prepended by #RRGGBB (only) in hexadecimal format
-^    if you want a listelement to start with # write ##
-^ index to be selected within textlist
-^ true/false draw transparent background
-^ see also minetest.explode_textlist_event (main menu: engine.explode_textlist_event)
-
-tabheader[<X>,<Y>;<name>;<caption 1>,<caption 2>,...,<caption n>;<current_tab>;<transparent>;<draw_border>]
-^ show a tabHEADER at specific position (ignores formsize)
-^ x and y position the itemlist relative to the top left of the menu
-^ name fieldname data is transferred to Lua
-^ caption 1... name shown on top of tab
-^ current_tab index of selected tab 1...
-^ transparent (optional) show transparent
-^ draw_border (optional) draw border
-
-box[<X>,<Y>;<W>,<H>;<color>]
-^ simple colored semitransparent box
-^ x and y position the box relative to the top left of the menu
-^ w and h are the size of box
-^ color as ColorString
-
-dropdown[<X>,<Y>;<W>;<name>;<item 1>,<item 2>, ...,<item n>;<selected idx>]
-^ show a dropdown field
-^ IMPORTANT NOTE: There are two different operation modes:
-^     1) handle directly on change (only changed dropdown is submitted)
-^     2) read the value on pressing a button (all dropdown values are available)
-^ x and y position of dropdown
-^ width of dropdown
-^ fieldname data is transferred to Lua
-^ items to be shown in dropdown
-^ index of currently selected dropdown item
-
-checkbox[<X>,<Y>;<name>;<label>;<selected>;<tooltip>]
-^ show a checkbox
-^ x and y position of checkbox
-^ name fieldname data is transferred to Lua
-^ label to be shown left of checkbox
-^ selected (optional) true/false
-^ tooltip (optional)
-
-scrollbar[<X>,<Y>;<W>,<H>;<orientation>;<name>;<value>]
-^ show a scrollbar
-^ there are two ways to use it:
-^     1) handle the changed event (only changed scrollbar is available)
-^     2) read the value on pressing a button (all scrollbars are available)
-^ x and y position of trackbar
-^ width and height
-^ orientation vertical/horizontal
-^ fieldname data is transferred to lua
-^ value this trackbar is set to (0-1000)
-^ see also minetest.explode_scrollbar_event (main menu: engine.explode_scrollbar_event)
-
-table[<X>,<Y>;<W>,<H>;<name>;<cell 1>,<cell 2>,...,<cell n>;<selected idx>]
-^ show scrollable table using options defined by the previous tableoptions[]
-^ displays cells as defined by the previous tablecolumns[]
-^ x and y position the itemlist relative to the top left of the menu
-^ w and h are the size of the itemlist
-^ name fieldname sent to server on row select or doubleclick
-^ cell 1...n cell contents given in row-major order
-^ selected idx: index of row to be selected within table (first row = 1)
-^ see also minetest.explode_table_event (main menu: engine.explode_table_event)
-
-tableoptions[<opt 1>;<opt 2>;...]
-^ sets options for table[]:
-^ color=#RRGGBB
-^^ default text color (ColorString), defaults to #FFFFFF
-^ background=#RRGGBB
-^^ table background color (ColorString), defaults to #000000
-^ border=<true/false>
-^^ should the table be drawn with a border? (default true)
-^ highlight=#RRGGBB
-^^ highlight background color (ColorString), defaults to #466432
-^ highlight_text=#RRGGBB
-^^ highlight text color (ColorString), defaults to #FFFFFF
-^ opendepth=<value>
-^^ all subtrees up to depth < value are open (default value = 0)
-^^ only useful when there is a column of type "tree"
-
-tablecolumns[<type 1>,<opt 1a>,<opt 1b>,...;<type 2>,<opt 2a>,<opt 2b>;...]
-^ sets columns for table[]:
-^ types: text, image, color, indent, tree
-^^ text:   show cell contents as text
-^^ image:  cell contents are an image index, use column options to define images
-^^ color:  cell contents are a ColorString and define color of following cell
-^^ indent: cell contents are a number and define indentation of following cell
-^^ tree:   same as indent, but user can open and close subtrees (treeview-like)
-^ column options:
-^^    align=<value>   for "text" and "image": content alignment within cells
-^^                    available values: left (default), center, right, inline
-^^    width=<value>   for "text" and "image": minimum width in em (default 0)
-^^                    for "indent" and "tree": indent width in em (default 1.5)
-^^    padding=<value> padding left of the column, in em (default 0.5)
-^^                    exception: defaults to 0 for indent columns
-^^    tooltip=<value> tooltip text (default empty)
-^ "image" column options:
-^^    0=<value>       sets image for image index 0
-^^    1=<value>       sets image for image index 1
-^^    2=<value>       sets image for image index 2
-^^                    and so on; defined indices need not be contiguous
-^^                    empty or non-numeric cells are treated as 0
-^ "color" column options:
-^^    span=<value>    number of following columns to affect (default infinite)
-
-Note: do NOT use a element name starting with "key_" those names are reserved to
+### Elements
+
+#### `size[<W>,<H>,<fixed_size>]`
+* Define the size of the menu in inventory slots
+* `fixed_size`: `true`/`false` (optional)
+* deprecated: `invsize[<W>,<H>;]`
+
+#### `list[<inventory location>;<list name>;<X>,<Y>;<W>,<H>;]`
+* Show an inventory list
+
+#### `list[<inventory location>;<list name>;<X>,<Y>;<W>,<H>;<starting item index>]`
+* Show an inventory list
+
+#### `listcolors[<slot_bg_normal>;<slot_bg_hover>]`
+* Sets background color of slots as `ColorString`
+* Sets background color of slots on mouse hovering
+
+#### `listcolors[<slot_bg_normal>;<slot_bg_hover>;<slot_border>]`
+* Sets background color of slots as `ColorString`
+* Sets background color of slots on mouse hovering
+* Sets color of slots border
+
+#### `listcolors[<slot_bg_normal>;<slot_bg_hover>;<slot_border>;<tooltip_bgcolor>;<tooltip_fontcolor>]`
+* Sets background color of slots as `ColorString`
+* Sets background color of slots on mouse hovering
+* Sets color of slots border
+* Sets default background color of tooltips
+* Sets default font color of tooltips
+
+#### `tooltip[<gui_element_name>;<tooltip_text>;<bgcolor>,<fontcolor>]`
+* Adds tooltip for an element
+* `<bgcolor>` tooltip background color as `ColorString` (optional)
+* `<fontcolor>` tooltip font color as `ColorString` (optional)
+
+#### `image[<X>,<Y>;<W>,<H>;<texture name>]`
+* Show an image
+* Position and size units are inventory slots
+
+#### `item_image[<X>,<Y>;<W>,<H>;<item name>]`
+* Show an inventory image of registered item/node
+* Position and size units are inventory slots
+
+#### `bgcolor[<color>;<fullscreen>]`
+* Sets background color of formspec as `ColorString`
+* If `true`, the background color is drawn fullscreen (does not effect the size of the formspec)
+
+#### `background[<X>,<Y>;<W>,<H>;<texture name>]`
+* Use a background. Inventory rectangles are not drawn then.
+* Position and size units are inventory slots
+* Example for formspec 8x4 in 16x resolution: image shall be sized
+  8 times 16px  times  4 times 16px.
+
+#### `background[<X>,<Y>;<W>,<H>;<texture name>;<auto_clip>]`
+* Use a background. Inventory rectangles are not drawn then.
+* Position and size units are inventory slots
+* Example for formspec 8x4 in 16x resolution:
+  image shall be sized 8 times 16px  times  4 times 16px
+* If `true` the background is clipped to formspec size (`x` and `y` are used as offset values, `w` and `h` are ignored)
+
+#### `pwdfield[<X>,<Y>;<W>,<H>;<name>;<label>]`
+* Textual password style field; will be sent to server when a button is clicked
+* `x` and `y` position the field relative to the top left of the menu
+* `w` and `h` are the size of the field
+* fields are a set height, but will be vertically centred on `h`
+* Position and size units are inventory slots
+* `name` is the name of the field as returned in fields to `on_receive_fields`
+* `label`, if not blank, will be text printed on the top left above the field
+
+#### `field[<X>,<Y>;<W>,<H>;<name>;<label>;<default>]`
+* Textual field; will be sent to server when a button is clicked
+* `x` and `y` position the field relative to the top left of the menu
+* `w` and `h` are the size of the field
+* fields are a set height, but will be vertically centred on `h`
+* Position and size units are inventory slots
+* `name` is the name of the field as returned in fields to `on_receive_fields`
+* `label`, if not blank, will be text printed on the top left above the field
+* `default` is the default value of the field
+    * `default` may contain variable references such as `${text}'` which
+      will fill the value from the metadata value `text`
+    * **Note**: no extra text or more than a single variable is supported ATM.
+
+#### `field[<name>;<label>;<default>]`
+* as above, but without position/size units
+* special field for creating simple forms, such as sign text input
+* must be used without a `size[]` element
+* a "Proceed" button will be added automatically
+
+#### `textarea[<X>,<Y>;<W>,<H>;<name>;<label>;<default>]`
+* same as fields above, but with multi-line input
+
+#### `label[<X>,<Y>;<label>]`
+* `x` and `y` work as per field
+* `label` is the text on the label
+* Position and size units are inventory slots
+
+#### `vertlabel[<X>,<Y>;<label>]`
+* Textual label drawn vertically
+* `x` and `y` work as per field
+* `label` is the text on the label
+* Position and size units are inventory slots
+
+#### `button[<X>,<Y>;<W>,<H>;<name>;<label>]`
+* Clickable button. When clicked, fields will be sent.
+* `x`, `y` and `name` work as per field
+* `w` and `h` are the size of the button
+* `label` is the text on the button
+* Position and size units are inventory slots
+
+#### `image_button[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>]`
+* `x`, `y`, `w`, `h`, and `name` work as per button
+* `texture name` is the filename of an image
+* Position and size units are inventory slots
+
+#### `image_button[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>;<noclip>;<drawborder>;<pressed texture name>]`
+* `x`, `y`, `w`, `h`, and `name` work as per button
+* `texture name` is the filename of an image
+* Position and size units are inventory slots
+* `noclip=true` means the image button doesn't need to be within specified formsize
+* `drawborder`: draw button border or not
+* `pressed texture name` is the filename of an image on pressed state
+
+#### `item_image_button[<X>,<Y>;<W>,<H>;<item name>;<name>;<label>]`
+* `x`, `y`, `w`, `h`, `name` and `label` work as per button
+* `item name` is the registered name of an item/node,
+   tooltip will be made out of its description
+   to override it use tooltip element
+* Position and size units are inventory slots
+
+#### `button_exit[<X>,<Y>;<W>,<H>;<name>;<label>]`
+* When clicked, fields will be sent and the form will quit.
+
+#### `image_button_exit[<X>,<Y>;<W>,<H>;<texture name>;<name>;<label>]`
+* When clicked, fields will be sent and the form will quit.
+
+#### `textlist[<X>,<Y>;<W>,<H>;<name>;<listelem 1>,<listelem 2>,...,<listelem n>]`
+* Scrollable item list showing arbitrary text elements
+* `x` and `y` position the itemlist relative to the top left of the menu
+* `w` and `h` are the size of the itemlist
+* `name` fieldname sent to server on doubleclick value is current selected element
+* `listelements` can be prepended by #color in hexadecimal format RRGGBB (only),
+     * if you want a listelement to start with "#" write "##".
+
+#### `textlist[<X>,<Y>;<W>,<H>;<name>;<listelem 1>,<listelem 2>,...,<listelem n>;<selected idx>;<transparent>]`
+* Scrollable itemlist showing arbitrary text elements
+* `x` and `y` position the item list relative to the top left of the menu
+* `w` and `h` are the size of the item list
+* `name` fieldname sent to server on doubleclick value is current selected element
+* `listelements` can be prepended by #RRGGBB (only) in hexadecimal format
+     * if you want a listelement to start with "#" write "##"
+* index to be selected within textlist
+* `true`/`false`: draw transparent background
+* see also `minetest.explode_textlist_event` (main menu: `engine.explode_textlist_event`)
+
+#### `tabheader[<X>,<Y>;<name>;<caption 1>,<caption 2>,...,<caption n>;<current_tab>;<transparent>;<draw_border>]`
+* show a tab**header** at specific position (ignores formsize)
+* `x` and `y` position the itemlist relative to the top left of the menu
+* `name` fieldname data is transferred to Lua
+* `caption 1`...: name shown on top of tab
+* `current_tab`: index of selected tab 1...
+* `transparent` (optional): show transparent
+* `draw_border` (optional): draw border
+
+#### `box[<X>,<Y>;<W>,<H>;<color>]`
+* simple colored semitransparent box
+* `x` and `y` position the box relative to the top left of the menu
+* `w` and `h` are the size of box
+* `color` is color specified as a `ColorString`
+
+#### `dropdown[<X>,<Y>;<W>;<name>;<item 1>,<item 2>, ...,<item n>;<selected idx>]`
+* show a dropdown field
+* **Important note**: There are two different operation modes:
+     1. handle directly on change (only changed dropdown is submitted)
+     2. read the value on pressing a button (all dropdown values are available)
+* `x` and `y` position of dropdown
+* width of dropdown
+* fieldname data is transferred to Lua
+* items to be shown in dropdown
+* index of currently selected dropdown item
+
+#### `checkbox[<X>,<Y>;<name>;<label>;<selected>;<tooltip>]`
+* show a checkbox
+* `x` and `y`: position of checkbox
+* `name` fieldname data is transferred to Lua
+* `label` to be shown left of checkbox
+* `selected` (optional): `true`/`false`
+* `tooltip` (optional)
+
+#### `scrollbar[<X>,<Y>;<W>,<H>;<orientation>;<name>;<value>]`
+* show a scrollbar
+* there are two ways to use it:
+     1. handle the changed event (only changed scrollbar is available)
+     2. read the value on pressing a button (all scrollbars are available)
+* `x` and `y`: position of trackbar
+* `w` and `h`: width and height
+* `orientation`:  `vertical`/`horizontal`
+* fieldname data is transferred to Lua
+* value this trackbar is set to (`0`-`1000`)
+* see also `minetest.explode_scrollbar_event` (main menu: `engine.explode_scrollbar_event`)
+
+#### `table[<X>,<Y>;<W>,<H>;<name>;<cell 1>,<cell 2>,...,<cell n>;<selected idx>]`
+* show scrollable table using options defined by the previous `tableoptions[]`
+* displays cells as defined by the previous `tablecolumns[]`
+* `x` and `y`: position the itemlist relative to the top left of the menu
+* `w` and `h` are the size of the itemlist
+* `name`: fieldname sent to server on row select or doubleclick
+* `cell 1`...`cell n`: cell contents given in row-major order
+* `selected idx`: index of row to be selected within table (first row = `1`)
+* see also `minetest.explode_table_event` (main menu: `engine.explode_table_event`)
+
+#### `tableoptions[<opt 1>;<opt 2>;...]`
+* sets options for `table[]`
+* `color=#RRGGBB`
+     * default text color (`ColorString`), defaults to `#FFFFFF`
+* `background=#RRGGBB`
+     * table background color (`ColorString`), defaults to `#000000`
+* `border=<true/false>`
+     * should the table be drawn with a border? (default: `true`)
+* `highlight=#RRGGBB`
+     * highlight background color (`ColorString`), defaults to `#466432`
+* `highlight_text=#RRGGBB`
+     * highlight text color (`ColorString`), defaults to `#FFFFFF`
+* `opendepth=<value>`
+     * all subtrees up to `depth < value` are open (default value = `0`)
+     * only useful when there is a column of type "tree"
+
+#### `tablecolumns[<type 1>,<opt 1a>,<opt 1b>,...;<type 2>,<opt 2a>,<opt 2b>;...]`
+* sets columns for `table[]`
+* types: `text`, `image`, `color`, `indent`, `tree`
+    * `text`:   show cell contents as text
+    * `image`:  cell contents are an image index, use column options to define images
+    * `colo`:   cell contents are a ColorString and define color of following cell
+    * `indent`: cell contents are a number and define indentation of following cell
+    * `tree`:   same as indent, but user can open and close subtrees (treeview-like)
+* column options:
+    * `align=<value>`
+        * for `text` and `image`: content alignment within cells.
+          Available values: `left` (default), `center`, `right`, `inline`
+    * `width=<value>`
+        * for `text` and `image`: minimum width in em (default: `0`)
+        * for `indent` and `tree`: indent width in em (default: `1.5`)
+    * `padding=<value>`: padding left of the column, in em (default `0.5`).
+      Exception: defaults to 0 for indent columns
+    * `tooltip=<value>`: tooltip text (default: empty)
+    * `image` column options:
+        * `0=<value>` sets image for image index 0
+        * `1=<value>` sets image for image index 1
+        * `2=<value>` sets image for image index 2
+        * and so on; defined indices need not be contiguous empty or
+          non-numeric cells are treated as `0`.
+    * `color` column options:
+        * `span=<value>`: number of following columns to affect (default: infinite)
+
+**Note**: do _not_ use a element name starting with `key_`; those names are reserved to
 pass key press events to formspec!
 
-Inventory location:
+Inventory locations
+-------------------
+* `"context"`: Selected node metadata (deprecated: `"current_name"`)
+* `"current_player"`: Player to whom the menu is shown
+* `"player:<name>"`: Any player
+* `"nodemeta:<X>,<Y>,<Z>"`: Any node metadata
+* `"detached:<name>"`: A detached inventory
 
-- "context": Selected node metadata (deprecated: "current_name")
-- "current_player": Player to whom the menu is shown
-- "player:<name>": Any player
-- "nodemeta:<X>,<Y>,<Z>": Any node metadata
-- "detached:<name>": A detached inventory
+`ColorString`
+-------------
+`#RGB` defines a color in hexadecimal format.
 
-ColorString
------------
-#RGB
-^ defines a color in hexadecimal format
-#RGBA
-^ defines a color in hexadecimal format and alpha channel
-#RRGGBB
-^ defines a color in hexadecimal format
-#RRGGBBAA
-^ defines a color in hexadecimal format and alpha channel
-
-Named colors are also supported and are equivalent to "CSS Color Module Level 4"
-(http://dev.w3.org/csswg/css-color/#named-colors). To specify the value of the
-alpha channel, append #AA to the end of the color name (e.g. colorname#08). For
-named colors the hexadecimal string representing the alpha value must (always)
-be two hexadecimal digits.
+`#RGBA` defines a color in hexadecimal format and alpha channel.
+
+`#RRGGBB` defines a color in hexadecimal format.
+
+`#RRGGBBAA` defines a color in hexadecimal format and alpha channel.
+
+Named colors are also supported and are equivalent to
+[CSS Color Module Level 4](http://dev.w3.org/csswg/css-color/#named-colors).
+To specify the value of the alpha channel, append `#AA` to the end of the color name
+(e.g. `colorname#08`). For named colors the hexadecimal string representing the alpha
+value must (always) be two hexadecimal digits.
 
 Vector helpers
----------------
-vector.new([x[, y, z]]) -> vector
- ^ x is a table or the x position.
-vector.direction(p1, p2) -> vector
-vector.distance(p1, p2) -> number
-vector.length(v) -> number
-vector.normalize(v) -> vector
-vector.round(v) -> vector
-vector.apply(v, func) -> vector
-vector.equals(v1, v2) -> bool
-For the following functions x can be either a vector or a number.
-vector.add(v, x) -> vector
-vector.subtract(v, x) -> vector
-vector.multiply(v, x) -> vector
-vector.divide(v, x) -> vector
+--------------
+
+* `vector.new([x[, y, z]])`: returns a vector.
+    * `x` is a table or the `x` position.
+
+* `vector.direction(p1, p2)`: returns a vector
+* `vector.distance(p1, p2)`: returns a number
+* `vector.length(v)`: returns a number
+* `vector.normalize(v)`: returns a vector
+* `vector.round(v)`: returns a vector
+* `vector.apply(v, func)`: returns a vector
+* `vector.equals(v1, v2)`: returns a boolean
+
+For the following functions `x` can be either a vector or a number:
+
+* `vector.add(v, x)`: returns a vector
+* `vector.subtract(v, x)`: returns a vector
+* `vector.multiply(v, x)`: returns a vector
+* `vector.divide(v, x)`: returns a vector
 
 Helper functions
 -----------------
-dump2(obj, name="_", dumped={})
-^ Return object serialized as a string, handles reference loops
-dump(obj, dumped={})
-^ Return object serialized as a string
-math.hypot(x, y)
-^ Get the hypotenuse of a triangle with legs x and y.
-  Useful for distance calculation.
-math.sign(x, tolerance)
-^ Get the sign of a number
-  Optional: Also returns 0 when the absolute value is within the tolerance (default 0)
-string.split(str, separator=",", include_empty=false, max_splits=-1, sep_is_pattern=false)
-^ If max_splits is negative, do not limit splits.
-^ sep_is_pattern specifies if separator is a plain string or a pattern (regex).
-^ e.g. string.split("a,b", ",") == {"a","b"}
-string.trim(str)
-^ e.g. string.trim("\n \t\tfoo bar\t ") == "foo bar"
-minetest.pos_to_string({x=X,y=Y,z=Z}) -> "(X,Y,Z)"
-^ Convert position to a printable string
-minetest.string_to_pos(string) -> position
-^ Same but in reverse. Returns nil if the string can't be parsed to a position.
-minetest.formspec_escape(string) -> string
-^ escapes characters [ ] \ , ;  that can not be used in formspecs
-minetest.is_yes(arg)
-^ returns whether arg can be interpreted as yes
-minetest.get_us_time()
-^ returns time with microsecond precision
-table.copy(table) -> table
-^ returns a deep copy of a table
-
-minetest namespace reference
------------------------------
-Utilities:
-minetest.get_current_modname() -> string
-minetest.get_modpath(modname) -> e.g. "/home/user/.minetest/usermods/modname"
-^ Useful for loading additional .lua modules or static data from mod
-minetest.get_modnames() -> list of installed mods
-^ Return a list of installed mods, sorted alphabetically
-minetest.get_worldpath() -> e.g. "/home/user/.minetest/world"
-^ Useful for storing custom data
-minetest.is_singleplayer()
-minetest.features
-^ table containing API feature flags: {foo=true, bar=true}
-minetest.has_feature(arg) -> bool, missing_features
-^ arg: string or table in format {foo=true, bar=true}
-^ missing_features: {foo=true, bar=true}
-minetest.get_player_information(playername)
-^ table containing information about player peer:
-{
-	address = "127.0.0.1",     -- IP address of client
-	ip_version = 4,            -- IPv4 / IPv6
-	min_rtt = 0.01,            -- minimum round trip time
-	max_rtt = 0.2,             -- maximum round trip time
-	avg_rtt = 0.02,            -- average round trip time
-	min_jitter = 0.01,         -- minimum packet time jitter
-	max_jitter = 0.5,          -- maximum packet time jitter
-	avg_jitter = 0.03,         -- average packet time jitter
-	connection_uptime = 200,   -- seconds since client connected
-
-	-- following information is available on debug build only!!!
-	-- DO NOT USE IN MODS
-	--ser_vers = 26,             -- serialization version used by client
-	--prot_vers = 23,            -- protocol version used by client
-	--major = 0,                 -- major version number
-	--minor = 4,                 -- minor version number
-	--patch = 10,                -- patch version number
-	--vers_string = "0.4.9-git", -- full version string
-	--state = "Active"           -- current client state
-}
-
-Logging:
-minetest.debug(line)
-^ Always printed to stderr and logfile (print() is redirected here)
-minetest.log(line)
-minetest.log(loglevel, line)
-^ loglevel one of "error", "action", "info", "verbose"
-
-Registration functions: (Call these only at load time)
-minetest.register_entity(name, prototype table)
-minetest.register_abm(abm definition)
-minetest.register_node(name, node definition)
-minetest.register_tool(name, item definition)
-minetest.register_craftitem(name, item definition)
-minetest.register_alias(name, convert_to)
-minetest.register_craft(recipe)
-minetest.register_ore(ore definition)
-minetest.register_decoration(decoration definition)
-minetest.override_item(name, redefinition)
-^ Overrides fields of an item registered with register_node/tool/craftitem.
-^ Note: Item must already be defined, (opt)depend on the mod defining it.
-^ Example: minetest.override_item("default:mese", {light_source=LIGHT_MAX})
-
-Global callback registration functions: (Call these only at load time)
-minetest.register_globalstep(func(dtime))
-^ Called every server step, usually interval of 0.1s
-minetest.register_on_shutdown(func())
-^ Called before server shutdown
-^ WARNING: If the server terminates abnormally (i.e. crashes), the registered
-           callbacks WILL LIKELY NOT BE RUN.  Data should be saved at
-           semi-frequent intervals as well as on server shutdown.
-minetest.register_on_placenode(func(pos, newnode, placer, oldnode, itemstack, pointed_thing))
-^ Called when a node has been placed
-^ If return true no item is taken from itemstack
-^ Not recommended; use on_construct or after_place_node in node definition
-^                  whenever possible
-minetest.register_on_dignode(func(pos, oldnode, digger))
-^ Called when a node has been dug.
-^ Not recommended: Use on_destruct or after_dig_node in node definition
-^                  whenever possible
-minetest.register_on_punchnode(func(pos, node, puncher, pointed_thing))
-^ Called when a node is punched
-minetest.register_on_generated(func(minp, maxp, blockseed))
-^ Called after generating a piece of world. Modifying nodes inside the area
-  is a bit faster than usually.
-minetest.register_on_newplayer(func(ObjectRef))
-^ Called after a new player has been created
-minetest.register_on_dieplayer(func(ObjectRef))
-^ Called when a player dies
-minetest.register_on_respawnplayer(func(ObjectRef))
-^ Called when player is to be respawned
-^ Called _before_ repositioning of player occurs
-^ return true in func to disable regular player placement
-minetest.register_on_prejoinplayer(func(name, ip))
-^ Called before a player joins the game
-^ If it returns a string, the player is disconnected with that string as reason
-minetest.register_on_joinplayer(func(ObjectRef))
-^ Called when a player joins the game
-minetest.register_on_leaveplayer(func(ObjectRef))
-^ Called when a player leaves the game
-minetest.register_on_cheat(func(ObjectRef, cheat))
-^ Called when a player cheats
-^ cheat: {type="moved_too_fast"/"interacted_too_far"/"finished_unknown_dig"/"dug_unbreakable"/"dug_too_fast"}
-minetest.register_on_chat_message(func(name, message))
-^ Called always when a player says something
-minetest.register_on_player_receive_fields(func(player, formname, fields))
-^ Called when a button is pressed in player's inventory form
-^ Newest functions are called first
-^ If function returns true, remaining functions are not called
-minetest.register_on_mapgen_init(func(MapgenParams))
-^ Deprecated; maintained for compatibility
-^ This immediately calls func(minetest.get_mapgen_params())
-^ MapgenParams consists of a table with the fields mgname, chunksize, seed, water_level, and flags
-minetest.register_on_craft(func(itemstack, player, old_craft_grid, craft_inv))
-^ Called when player crafts something
-^ itemstack is the output
-^ old_craft_grid contains the recipe (Note: the one in the inventory is cleared)
-^ craft_inv is the inventory with the crafting grid
-^ Return either an ItemStack, to replace the output, or nil, to not modify it
-minetest.register_craft_predict(func(itemstack, player, old_craft_grid, craft_inv))
-^ The same as before, except that it is called before the player crafts, to make
-^ craft prediction, and it should not change anything.
-minetest.register_on_protection_violation(func(pos, name))
-^ Called by builtin and mods when a player violates protection at a position
-  (eg, digs a node or punches a protected entity).
-^ The registered functions can be called using minetest.record_protection_violation
-^ The provided function should check that the position is protected by the mod
-  calling this function before it prints a message, if it does, to allow for
-  multiple protection mods.
-minetest.register_on_item_eat(func(hp_change, replace_with_item, itemstack, user, pointed_thing))
-^ Called when an item is eaten, by minetest.item_eat
-^ Return true or itemstack to cancel the default item eat response (ie: hp increase)
-
-Other registration functions:
-minetest.register_chatcommand(cmd, chatcommand definition)
-minetest.register_privilege(name, definition)
-^ definition: "description text"
-^ definition: {
-      description = "description text",
-      give_to_singleplayer = boolean, -- default: true
-  }
-minetest.register_authentication_handler(handler)
-^ See minetest.builtin_auth_handler in builtin.lua for reference
-
-Setting-related:
-minetest.setting_set(name, value)
-minetest.setting_get(name) -> string or nil
-minetest.setting_setbool(name, value)
-minetest.setting_getbool(name) -> boolean value or nil
-minetest.setting_get_pos(name) -> position or nil
-minetest.setting_save() -> nil, save all settings to config file
-
-Authentication:
-minetest.notify_authentication_modified(name)
-^ Should be called by the authentication handler if privileges change.
-^ To report everybody, set name=nil.
-minetest.get_password_hash(name, raw_password)
-^ Convert a name-password pair to a password hash that minetest can use
-minetest.string_to_privs(str) -> {priv1=true,...}
-minetest.privs_to_string(privs) -> "priv1,priv2,..."
-^ Convert between two privilege representations
-minetest.set_player_password(name, password_hash)
-minetest.set_player_privs(name, {priv1=true,...})
-minetest.get_player_privs(name) -> {priv1=true,...}
-minetest.auth_reload()
-^ These call the authentication handler
-minetest.check_player_privs(name, {priv1=true,...}) -> bool, missing_privs
-^ A quickhand for checking privileges
-minetest.get_player_ip(name) -> IP address string
-
-Chat:
-minetest.chat_send_all(text)
-minetest.chat_send_player(name, text)
-
-Environment access:
-
-minetest.set_node(pos, node)
-minetest.add_node(pos, node): alias set_node(pos, node)
-^ Set node at position (node = {name="foo", param1=0, param2=0})
-minetest.swap_node(pos, node)
-^ Set node at position, but don't remove metadata
-minetest.remove_node(pos)
-^ Equivalent to set_node(pos, "air")
-minetest.get_node(pos)
-^ Returns {name="ignore", ...} for unloaded area
-minetest.get_node_or_nil(pos)
-^ Returns nil for unloaded area
-minetest.get_node_light(pos, timeofday) -> 0...15 or nil
-^ timeofday: nil = current time, 0 = night, 0.5 = day
-
-minetest.place_node(pos, node)
-^ Place node with the same effects that a player would cause
-minetest.dig_node(pos)
-^ Dig node with the same effects that a player would cause
-  Returns true if successful, false on failure (e.g. protected location)
-minetest.punch_node(pos)
-^ Punch node with the same effects that a player would cause
-
-minetest.get_meta(pos) -- Get a NodeMetaRef at that position
-minetest.get_node_timer(pos) -- Get NodeTimerRef
-
-minetest.add_entity(pos, name): Spawn Lua-defined entity at position
-^ Returns ObjectRef, or nil if failed
-minetest.add_item(pos, item): Spawn item
-^ Returns ObjectRef, or nil if failed
-minetest.get_player_by_name(name) -- Get an ObjectRef to a player
-minetest.get_objects_inside_radius(pos, radius)
-minetest.set_timeofday(val): val: 0...1; 0 = midnight, 0.5 = midday
-minetest.get_timeofday()
-minetest.get_gametime(): returns the time, in seconds, since the world was created
-minetest.find_node_near(pos, radius, nodenames) -> pos or nil
-^ nodenames: e.g. {"ignore", "group:tree"} or "default:dirt"
-minetest.find_nodes_in_area(minp, maxp, nodenames) -> list of positions
-^ nodenames: e.g. {"ignore", "group:tree"} or "default:dirt"
-minetest.get_perlin(noiseparams)
-minetest.get_perlin(seeddiff, octaves, persistence, scale)
-^ Return world-specific perlin noise (int(worldseed)+seeddiff)
-minetest.get_voxel_manip()
-^ Return voxel manipulator object
-minetest.get_voxel_manip(p1, p2)
-^ Return voxel manipulator object with map pre-loaded
-minetest.set_gen_notify(flags, {deco_ids})
-^ Set the types of on-generate notifications that should be collected
-^ flags is a flag field with the available flags:
-^   dungeon, temple, cave_begin, cave_end, large_cave_begin, large_cave_end, decoration
-^ The second parameter is a list of IDS of decorations which notification is requested for
-minetest.get_mapgen_object(objectname)
-^ Return requested mapgen object if available (see Mapgen objects)
-minetest.get_mapgen_params()
-^ Returns mapgen params
-^ A table consisting of mgname, seed, chunksize, water_level, and flags
-^ Can be called at any time
-minetest.set_mapgen_params(MapgenParams)
-^ Set map generation parameters
-^ Function cannot be called after the registration period; only initialization and on_mapgen_init
-^ Takes a table as an argument with the fields mgname, seed, water_level, and flags.
-^ Leave field unset to leave that parameter unchanged
-^ flags contains a comma-delimited string of flags to set, or if the prefix "no" is attached, clears instead.
-^ flags is in the same format and has the same options as 'mg_flags' in minetest.conf
-minetest.set_noiseparams(name, noiseparams, set_default)
-^ Sets the noiseparams setting of 'name' to the noiseparams table specified in 'noiseparams'.
-^ 'set_default', is an optional boolean (default of true) that specifies whether the setting
-^ should be applied to the default config or current active config
-minetest.clear_objects()
-^ clear all objects in the environments
-minetest.line_of_sight(pos1, pos2, stepsize) -> true/false, pos
-^ Check if there is a direct line of sight between pos1 and pos2
-^ Returns the position of the blocking node when false
-^ pos1 First position
-^ pos2 Second position
-^ stepsize smaller gives more accurate results but requires more computing
-             time. Default is 1.
-minetest.find_path(pos1,pos2,searchdistance,max_jump,max_drop,algorithm)
-^ -> table containing path
-^ returns a table of 3d points representing a path from pos1 to pos2 or nil
-^ pos1: start position
-^ pos2: end position
-^ searchdistance: number of blocks to search in each direction
-^ max_jump: maximum height difference to consider walkable
-^ max_drop: maximum height difference to consider droppable
-^ algorithm: A*_noprefetch(default), A*, Dijkstra
-minetest.spawn_tree (pos, {treedef})
-^ spawns L-System tree at given pos with definition in treedef table
-minetest.transforming_liquid_add(pos)
-^ add node to liquid update queue
-minetest.get_node_max_level(pos)
-^ get max available level for leveled node
-minetest.get_node_level(pos)
-^ get level of leveled node (water, snow)
-minetest.set_node_level(pos, level)
-^ set level of leveled node, default level = 1, if totallevel > maxlevel returns rest (total-max).
-minetest.add_node_level(pos, level)
-^ increase level of leveled node by level, default level = 1, if totallevel > maxlevel returns rest (total-max). can be negative for decreasing
-
-Inventory:
-minetest.get_inventory(location) -> InvRef
-^ location = e.g. {type="player", name="celeron55"}
-                 {type="node", pos={x=, y=, z=}}
-                 {type="detached", name="creative"}
-minetest.create_detached_inventory(name, callbacks) -> InvRef
-^ callbacks: See "Detached inventory callbacks"
-^ Creates a detached inventory. If it already exists, it is cleared.
-
-Formspec:
-minetest.show_formspec(playername, formname, formspec)
-^ playername: name of player to show formspec
-^ formname: name passed to on_player_receive_fields callbacks
-^           should follow "modname:<whatever>" naming convention
-^ formspec: formspec to display
-minetest.formspec_escape(string) -> string
-^ escapes characters [ ] \ , ; that can not be used in formspecs
-minetest.explode_table_event(string) -> table
-^ returns e.g. {type="CHG", row=1, column=2}
-^ type: "INV" (no row selected), "CHG" (selected) or "DCL" (double-click)
-minetest.explode_textlist_event(string) -> table
-^ returns e.g. {type="CHG", index=1}
-^ type: "INV" (no row selected), "CHG" (selected) or "DCL" (double-click)
-minetest.explode_scrollbar_event(string) -> table
-^ returns e.g. {type="CHG", value=500}
-^ type: "INV" (something failed), "CHG" (has been changed) or "VAL" (not changed)
-
-Item handling:
-minetest.inventorycube(img1, img2, img3)
-^ Returns a string for making an image of a cube (useful as an item image)
-minetest.get_pointed_thing_position(pointed_thing, above)
-^ Get position of a pointed_thing (that you can get from somewhere)
-minetest.dir_to_facedir(dir, is6d)
-^ Convert a vector to a facedir value, used in param2 for paramtype2="facedir"; passing something non-nil/false for the optional second parameter causes it to take the y component into account
-minetest.facedir_to_dir(facedir)
-^ Convert a facedir back into a vector aimed directly out the "back" of a node
-minetest.dir_to_wallmounted(dir)
-^ Convert a vector to a wallmounted value, used for paramtype2="wallmounted"
-minetest.get_node_drops(nodename, toolname)
-^ Returns list of item names.
-^ Note: This will be removed or modified in a future version.
-minetest.get_craft_result(input) -> output, decremented_input
-^ input.method = 'normal' or 'cooking' or 'fuel'
-^ input.width = for example 3
-^ input.items = for example { stack 1, stack 2, stack 3, stack 4,
-                              stack 5, stack 6, stack 7, stack 8, stack 9 }
-^ output.item = ItemStack, if unsuccessful: empty ItemStack
-^ output.time = number, if unsuccessful: 0
-^ decremented_input = like input
-minetest.get_craft_recipe(output) -> input
-^ returns last registered recipe for output item (node)
-^ output is a node or item type such as 'default:torch'
-^ input.method = 'normal' or 'cooking' or 'fuel'
-^ input.width = for example 3
-^ input.items = for example { stack 1, stack 2, stack 3, stack 4,
-                              stack 5, stack 6, stack 7, stack 8, stack 9 }
-^ input.items = nil if no recipe found
-minetest.get_all_craft_recipes(query item) -> table or nil
-^ returns indexed table with all registered recipes for query item (node)
-  or nil if no recipe was found
-  recipe entry table:
-  {
-   method = 'normal' or 'cooking' or 'fuel'
-   width = 0-3, 0 means shapeless recipe
-   items = indexed [1-9] table with recipe items
-   output = string with item name and quantity
-  }
-  Example query for default:gold_ingot will return table:
-  {
-   1={type = "cooking", width = 3, output = "default:gold_ingot",
-    items = {1 = "default:gold_lump"}},
-   2={type = "normal", width = 1, output = "default:gold_ingot 9",
-    items = {1 = "default:goldblock"}}
-  }
-minetest.handle_node_drops(pos, drops, digger)
-^ drops: list of itemstrings
-^ Handles drops from nodes after digging: Default action is to put them into
-  digger's inventory
-^ Can be overridden to get different functionality (e.g. dropping items on
-  ground)
-
-Rollback:
-minetest.rollback_get_node_actions(pos, range, seconds, limit) -> {{actor, pos, time, oldnode, newnode}, ...}
-^ Find who has done something to a node, or near a node
-^ actor: "player:<name>", also "liquid".
-minetest.rollback_revert_actions_by(actor, seconds) -> bool, log messages
-^ Revert latest actions of someone
-^ actor: "player:<name>", also "liquid".
-
-Defaults for the on_* item definition functions:
-(These return the leftover itemstack)
-minetest.item_place_node(itemstack, placer, pointed_thing, param2)
-^ Place item as a node
-^ param2 overrides facedir and wallmounted param2
-^ returns itemstack, success
-minetest.item_place_object(itemstack, placer, pointed_thing)
-^ Place item as-is
-minetest.item_place(itemstack, placer, pointed_thing, param2)
-^ Use one of the above based on what the item is.
-^ Calls on_rightclick of pointed_thing.under if defined instead
-^ Note: is not called when wielded item overrides on_place
-^ param2 overrides facedir and wallmounted param2
-^ returns itemstack, success
-minetest.item_drop(itemstack, dropper, pos)
-^ Drop the item
-minetest.item_eat(hp_change, replace_with_item)
-^ Eat the item. replace_with_item can be nil.
-
-Defaults for the on_punch and on_dig node definition callbacks:
-minetest.node_punch(pos, node, puncher, pointed_thing)
-^ Calls functions registered by minetest.register_on_punchnode()
-minetest.node_dig(pos, node, digger)
-^ Checks if node can be dug, puts item into inventory, removes node
-^ Calls functions registered by minetest.registered_on_dignodes()
-
-Sounds:
-minetest.sound_play(spec, parameters) -> handle
-^ spec = SimpleSoundSpec
-^ parameters = sound parameter table
-minetest.sound_stop(handle)
-
-Timing:
-minetest.after(time, func, ...)
-^ Call function after time seconds
-^ Optional: Variable number of arguments that are passed to func
-
-Server:
-minetest.request_shutdown() -> request for server shutdown
-minetest.get_server_status() -> server status string
-
-Bans:
-minetest.get_ban_list() -> ban list (same as minetest.get_ban_description(""))
-minetest.get_ban_description(ip_or_name) -> ban description (string)
-minetest.ban_player(name) -> ban a player
-minetest.unban_player_or_ip(name) -> unban player or IP address
-minetest.kick_player(name, [reason]) -> disconnect a player with a optional reason
-
-Particles:
-minetest.add_particle(particle definition)
-^ Deprecated: minetest.add_particle(pos, velocity, acceleration, expirationtime,
-    size, collisiondetection, texture, playername)
-
-minetest.add_particlespawner(particlespawner definition)
-^ Add a particlespawner, an object that spawns an amount of particles over time seconds
-^ Returns an id
-^ Deprecated: minetest.add_particlespawner(amount, time,
-    minpos, maxpos,
-    minvel, maxvel,
-    minacc, maxacc,
-    minexptime, maxexptime,
-    minsize, maxsize,
-    collisiondetection, texture, playername)
-
-minetest.delete_particlespawner(id, player)
-^ Delete ParticleSpawner with id (return value from add_particlespawner)
-^ If playername is specified, only deletes on the player's client,
-^ otherwise on all clients
-
-Schematics:
-minetest.create_schematic(p1, p2, probability_list, filename, slice_prob_list)
-^ Create a schematic from the volume of map specified by the box formed by p1 and p2.
-^ Apply the specified probability values to the specified nodes in probability_list.
-   ^ probability_list is an array of tables containing two fields, pos and prob.
-   ^ pos is the 3d vector specifying the absolute coordinates of the node being modified,
-   ^ and prob is the integer value from 0 to 255 of the probability (see: Schematic specifier).
-   ^ If there are two or more entries with the same pos value, the last entry is used.
-   ^ If pos is not inside the box formed by p1 and p2, it is ignored.
-   ^ If probability_list is nil, no probabilities are applied.
-   ^ Slice probability works in the same manner, except takes a field called ypos instead which indicates
-   ^ the y position of the slice with a probability applied.
-   ^ If slice probability list is nil, no slice probabilities are applied.
-^ Saves schematic in the Minetest Schematic format to filename.
-
-minetest.place_schematic(pos, schematic, rotation, replacements, force_placement)
-^ Place the schematic specified by schematic (see: Schematic specifier) at pos.
-^ Rotation can be "0", "90", "180", "270", or "random".
-^ If the rotation parameter is omitted, the schematic is not rotated.
-^ replacements = {["old_name"] = "convert_to", ...}
-^ force_placement is a boolean indicating whether nodes other than air and
-^ ignore are replaced by the schematic
-
-Misc.:
-minetest.get_connected_players() -> list of ObjectRefs
-minetest.hash_node_position({x=,y=,z=}) -> 48-bit integer
-^ Gives a unique hash number for a node position (16+16+16=48bit)
-minetest.get_position_from_hash(hash) -> position
-^ Inverse transform of minetest.hash_node_position
-minetest.get_item_group(name, group) -> rating
-^ Get rating of a group of an item. (0 = not in group)
-minetest.get_node_group(name, group) -> rating
-^ Deprecated: An alias for the former.
-minetest.get_content_id(name) -> integer
-^ Gets the internal content ID of name
-minetest.get_name_from_content_id(content_id) -> string
-^ Gets the name of the content with that content ID
-minetest.parse_json(string[, nullvalue]) -> something
-^ Convert a string containing JSON data into the Lua equivalent
-^ nullvalue: returned in place of the JSON null; defaults to nil
-^ On success returns a table, a string, a number, a boolean or nullvalue
-^ On failure outputs an error message and returns nil
-^ Example: parse_json("[10, {\"a\":false}]") -> {10, {a = false}}
-minetest.write_json(data[, styled]) -> string or nil and error message
-^ Convert a Lua table into a JSON string
-^ styled: Outputs in a human-readable format if this is set, defaults to false
-^ Unserializable things like functions and userdata are saved as null.
-^ Warning: JSON is more strict than the Lua table format.
-    1. You can only use strings and positive integers of at least one as keys.
-    2. You can not mix string and integer keys.
-    This is due to the fact that JSON has two distinct array and object values.
-^ Example: write_json({10, {a = false}}) -> "[10, {\"a\": false}]"
-minetest.serialize(table) -> string
-^ Convert a table containing tables, strings, numbers, booleans and nils
-  into string form readable by minetest.deserialize
-^ Example: serialize({foo='bar'}) -> 'return { ["foo"] = "bar" }'
-minetest.deserialize(string) -> table
-^ Convert a string returned by minetest.deserialize into a table
-^ String is loaded in an empty sandbox environment.
-^ Will load functions, but they cannot access the global environment.
-^ Example: deserialize('return { ["foo"] = "bar" }') -> {foo='bar'}
-^ Example: deserialize('print("foo")') -> nil (function call fails)
-  ^ error:[string "print("foo")"]:1: attempt to call global 'print' (a nil value)
-minetest.compress(data, method, ...) -> compressed_data
-^ Compress a string of data.
-^ `method` is a string identifying the compression method to be used.
-^ Supported compression methods:
-^     Deflate (zlib): "deflate"
-^ `...` indicates method-specific arguments.  Currently defined arguments are:
-^     Deflate: `level` - Compression level, 0-9 or nil.
-minetest.decompress(compressed_data, method, ...) -> data
-^ Decompress a string of data (using ZLib).
-^ See documentation on minetest.compress() for supported compression methods.
-^ currently supported.
-^ `...` indicates method-specific arguments.  Currently, no methods use this.
-minetest.is_protected(pos, name) -> bool
-^ This function should be overridden by protection mods and should be used to
-  check if a player can interact at a position.
-^ This function should call the old version of itself if the position is not
-  protected by the mod.
-^ Example:
-	local old_is_protected = minetest.is_protected
-	function minetest.is_protected(pos, name)
-		if mymod:position_protected_from(pos, name) then
-			return true
-		end
-		return old_is_protected(pos, name)
-	end
-minetest.record_protection_violation(pos, name)
-^ This function calls functions registered with
-  minetest.register_on_protection_violation.
-minetest.rotate_and_place(itemstack, placer, pointed_thing, infinitestacks, orient_flags)
-^ Attempt to predict the desired orientation of the facedir-capable node
-  defined by itemstack, and place it accordingly (on-wall, on the floor, or
-  hanging from the ceiling). Stacks are handled normally if the infinitestacks
-  field is false or omitted (else, the itemstack is not changed). orient_flags
-  is an optional table containing extra tweaks to the placement code:
-  invert_wall:		if true, place wall-orientation on the ground and ground-
-					orientation on the wall.
-  force_wall:		if true, always place the node in wall orientation.
-  force_ceiling:	if true, always place on the ceiling.
-  force_floor:		if true, always place the node on the floor.
-
-  The above four options are mutually-exclusive; the last in the list takes
-  precedence over the first.
-
-  force_facedir:	if true, forcefully reset the facedir to north when placing on
-					the floor or ceiling
-
-minetest.rotate_node(itemstack, placer, pointed_thing)
-^ calls rotate_and_place() with infinitestacks set according to the state of
-  the creative mode setting, and checks for "sneak" to set the invert_wall
-  parameter.
-
-minetest.forceload_block(pos)
-^ forceloads the position pos.
-^ returns true if area could be forceloaded
-
-minetest.forceload_free_block(pos)
-^ stops forceloading the position pos.
+* `dump2(obj, name="_", dumped={})`
+     * Return object serialized as a string, handles reference loops
+* `dump(obj, dumped={})`
+    * Return object serialized as a string
+* `math.hypot(x, y)`
+    * Get the hypotenuse of a triangle with legs x and y.
+      Useful for distance calculation.
+* `math.sign(x, tolerance)`
+    * Get the sign of a number.
+      Optional: Also returns `0` when the absolute value is within the tolerance (default: `0`)
+* `string.split(str, separator=",", include_empty=false, max_splits=-1,
+* sep_is_pattern=false)`
+    * If `max_splits` is negative, do not limit splits.
+    * `sep_is_pattern` specifies if separator is a plain string or a pattern (regex).
+    * e.g. `string:split("a,b", ",") == {"a","b"}`
+* `string:trim()`
+    * e.g. `string.trim("\n \t\tfoo bar\t ") == "foo bar"`
+* `minetest.pos_to_string({x=X,y=Y,z=Z})`: returns `"(X,Y,Z)"`
+    * Convert position to a printable string
+* `minetest.string_to_pos(string)`: returns a position
+    * Same but in reverse. Returns `nil` if the string can't be parsed to a position.
+* `minetest.formspec_escape(string)`: returns a string
+    * escapes the characters "[", "]", "\", "," and ";", which can not be used in formspecs
+* `minetest.is_yes(arg)`
+    * returns whether `arg` can be interpreted as yes
+* `minetest.get_us_time()`
+    * returns time with microsecond precision
+* `table.copy(table)`: returns a table
+    * returns a deep copy of `table`
+
+`minetest` namespace reference
+------------------------------
+
+### Utilities
+
+* `minetest.get_current_modname()`: returns a string
+* `minetest.get_modpath(modname)`: returns e.g. `"/home/user/.minetest/usermods/modname"`
+    * Useful for loading additional `.lua` modules or static data from mod
+* `minetest.get_modnames()`: returns a list of installed mods
+    * Return a list of installed mods, sorted alphabetically
+* `minetest.get_worldpath()`: returns e.g. `"/home/user/.minetest/world"`
+    * Useful for storing custom data
+* `minetest.is_singleplayer()`
+* `minetest.features`
+    * table containing API feature flags: `{foo=true, bar=true}`
+* `minetest.has_feature(arg)`: returns `boolean, missing_features`
+    * `arg`: string or table in format `{foo=true, bar=true}`
+    * `missing_features`: `{foo=true, bar=true}`
+* `minetest.get_player_information(playername)`
+    * table containing information about player peer.
+
+Example of `minetest.get_player_information` return value:
+
+    {
+        address = "127.0.0.1",     -- IP address of client
+        ip_version = 4,            -- IPv4 / IPv6
+        min_rtt = 0.01,            -- minimum round trip time
+        max_rtt = 0.2,             -- maximum round trip time
+        avg_rtt = 0.02,            -- average round trip time
+        min_jitter = 0.01,         -- minimum packet time jitter
+        max_jitter = 0.5,          -- maximum packet time jitter
+        avg_jitter = 0.03,         -- average packet time jitter
+        connection_uptime = 200,   -- seconds since client connected
+
+        -- following information is available on debug build only!!!
+        -- DO NOT USE IN MODS
+        --ser_vers = 26,             -- serialization version used by client
+        --prot_vers = 23,            -- protocol version used by client
+        --major = 0,                 -- major version number
+        --minor = 4,                 -- minor version number
+        --patch = 10,                -- patch version number
+        --vers_string = "0.4.9-git", -- full version string
+        --state = "Active"           -- current client state
+    }
+
+### Logging
+* `minetest.debug(line)`
+    * Always printed to `stderr` and logfile (`print()` is redirected here)
+* `minetest.log(line)`
+* `minetest.log(loglevel, line)`
+    * `loglevel` is one of `"error"`, `"action"`, `"info"`, `"verbose"`
+
+### Registration functions
+Call these functions only at load time!
+
+* `minetest.register_entity(name, prototype table)`
+* `minetest.register_abm(abm definition)`
+* `minetest.register_node(name, node definition)`
+* `minetest.register_tool(name, item definition)`
+* `minetest.register_craftitem(name, item definition)`
+* `minetest.register_alias(name, convert_to)`
+* `minetest.register_craft(recipe)`
+* `minetest.register_ore(ore definition)`
+* `minetest.register_decoration(decoration definition)`
+* `minetest.override_item(name, redefinition)`
+    * Overrides fields of an item registered with register_node/tool/craftitem.
+    * Note: Item must already be defined, (opt)depend on the mod defining it.
+    * Example: `minetest.override_item("default:mese", {light_source=LIGHT_MAX})`
+
+### Global callback registration functions
+Call these functions only at load time!
+
+* `minetest.register_globalstep(func(dtime))`
+    * Called every server step, usually interval of 0.1s
+* `minetest.register_on_shutdown(func())`
+    * Called before server shutdown
+    * **Warning**: If the server terminates abnormally (i.e. crashes), the registered
+      callbacks **will likely not be run**. Data should be saved at
+      semi-frequent intervals as well as on server shutdown.
+* `minetest.register_on_placenode(func(pos, newnode, placer, oldnode, itemstack, pointed_thing))`
+    * Called when a node has been placed
+    * If return `true` no item is taken from `itemstack`
+    * **Not recommended**; use `on_construct` or `after_place_node` in node definition
+      whenever possible
+* `minetest.register_on_dignode(func(pos, oldnode, digger))`
+    * Called when a node has been dug.
+    * **Not recommended**; Use `on_destruct` or `after_dig_node` in node definition
+      whenever possible
+* `minetest.register_on_punchnode(func(pos, node, puncher, pointed_thing))`
+     * Called when a node is punched
+* `minetest.register_on_generated(func(minp, maxp, blockseed))`
+     * Called after generating a piece of world. Modifying nodes inside the area
+       is a bit faster than usually.
+* `minetest.register_on_newplayer(func(ObjectRef))`
+     * Called after a new player has been created
+* `minetest.register_on_dieplayer(func(ObjectRef))`
+     * Called when a player dies
+* `minetest.register_on_respawnplayer(func(ObjectRef))`
+     * Called when player is to be respawned
+     * Called _before_ repositioning of player occurs
+     * return true in func to disable regular player placement
+* `minetest.register_on_prejoinplayer(func(name, ip))`
+     * Called before a player joins the game
+     * If it returns a string, the player is disconnected with that string as reason
+* `minetest.register_on_joinplayer(func(ObjectRef))`
+    * Called when a player joins the game
+* `minetest.register_on_leaveplayer(func(ObjectRef))`
+    * Called when a player leaves the game
+* `minetest.register_on_cheat(func(ObjectRef, cheat))`
+    * Called when a player cheats
+    * `cheat`: `{type=<cheat_type>}`, where `<cheat_type>` is one of:
+        * `"moved_too_fast"`
+        * `"interacted_too_far"`
+        * `"finished_unknown_dig"`
+        * `dug_unbreakable`
+        * `dug_too_fast`
+* `minetest.register_on_chat_message(func(name, message))`
+    * Called always when a player says something
+* `minetest.register_on_player_receive_fields(func(player, formname, fields))`
+    * Called when a button is pressed in player's inventory form
+    * Newest functions are called first
+    * If function returns `true`, remaining functions are not called
+* `minetest.register_on_craft(func(itemstack, player, old_craft_grid, craft_inv))`
+    * Called when `player` crafts something
+    * `itemstack` is the output
+    * `old_craft_grid` contains the recipe (Note: the one in the inventory is cleared)
+    * `craft_inv` is the inventory with the crafting grid
+    * Return either an `ItemStack`, to replace the output, or `nil`, to not modify it
+* `minetest.register_craft_predict(func(itemstack, player, old_craft_grid, craft_inv))`
+    * The same as before, except that it is called before the player crafts, to make
+   craft prediction, and it should not change anything.
+* `minetest.register_on_protection_violation(func(pos, name))`
+    * Called by `builtin` and mods when a player violates protection at a position
+      (eg, digs a node or punches a protected entity).
+      * The registered functions can be called using `minetest.record_protection_violation`
+      * The provided function should check that the position is protected by the mod
+        calling this function before it prints a message, if it does, to allow for
+        multiple protection mods.
+* `minetest.register_on_item_eat(func(hp_change, replace_with_item, itemstack, user, pointed_thing))`
+    * Called when an item is eaten, by `minetest.item_eat`
+    * Return `true` or `itemstack` to cancel the default item eat response (i.e.: hp increase)
+
+### Other registration functions
+* `minetest.register_chatcommand(cmd, chatcommand definition)`
+* `minetest.register_privilege(name, definition)`
+    * `definition`: `"description text"`
+    * `definition`: `{ description = "description text", give_to_singleplayer = boolean, -- default: true }`
+* `minetest.register_authentication_handler(handler)`
+    * See `minetest.builtin_auth_handler` in `builtin.lua` for reference
+
+### Setting-related
+* `minetest.setting_set(name, value)`
+* `minetest.setting_get(name)`: returns string or `nil`
+* `minetest.setting_setbool(name, value)`
+* `minetest.setting_getbool(name)`: returns boolean or `nil`
+* `minetest.setting_get_pos(name)`: returns position or nil
+* `minetest.setting_save()`, returns `nil`, save all settings to config file
+
+### Authentication
+* `minetest.notify_authentication_modified(name)`
+    * Should be called by the authentication handler if privileges changes.
+    * To report everybody, set `name=nil`.
+* `minetest.get_password_hash(name, raw_password)`
+    * Convert a name-password pair to a password hash that Minetest can use
+* `minetest.string_to_privs(str)`: returns `{priv1=true,...}`
+* `minetest.privs_to_string(privs)`: returns `"priv1,priv2,..."`
+    * Convert between two privilege representations
+* `minetest.set_player_password(name, password_hash)`
+* `minetest.set_player_privs(name, {priv1=true,...})`
+* `minetest.get_player_privs(name) -> {priv1=true,...}`
+* `minetest.auth_reload()`
+* `minetest.check_player_privs(name, {priv1=true,...})`: returns `bool, missing_privs`
+    * A quickhand for checking privileges
+* `minetest.get_player_ip(name)`: returns an IP address string
+
+`minetest.set_player_password`, `minetest_set_player_privs`, `minetest_get_player_privs`
+and `minetest.auth_reload` call the authetification handler.
+
+### Chat
+* `minetest.chat_send_all(text)`
+* `minetest.chat_send_player(name, text)`
+
+### Environment access
+* `minetest.set_node(pos, node)`
+* `minetest.add_node(pos, node): alias set_node(pos, node)`
+    * Set node at position (`node = {name="foo", param1=0, param2=0}`)
+* `minetest.swap_node(pos, node`
+    * Set node at position, but don't remove metadata
+* `minetest.remove_node(pos)`
+    * Equivalent to `set_node(pos, "air")`
+* `minetest.get_node(pos)`
+    * Returns `{name="ignore", ...}` for unloaded area
+* `minetest.get_node_or_nil(pos)`
+    * Returns `nil` for unloaded area
+* `minetest.get_node_light(pos, timeofday)` returns a number between `0` and `15` or `nil`
+    * `timeofday`: `nil` for current time, `0` for night, `0.5` for day
+
+* `minetest.place_node(pos, node)`
+    * Place node with the same effects that a player would cause
+* `minetest.dig_node(pos)`
+    * Dig node with the same effects that a player would cause
+    * Returns `true` if successful, `false` on failure (e.g. protected location)
+* `minetest.punch_node(pos)`
+    * Punch node with the same effects that a player would cause
+
+* `minetest.get_meta(pos)`
+    * Get a `NodeMetaRef` at that position
+* `minetest.get_node_timer(pos)`
+    * Get `NodeTimerRef`
+
+* `minetest.add_entity(pos, name)`: Spawn Lua-defined entity at position
+    * Returns `ObjectRef`, or `nil` if failed
+* `minetest.add_item(pos, item)`: Spawn item
+    * Returns `ObjectRef`, or `nil` if failed
+* `minetest.get_player_by_name(name)`: Get an `ObjectRef` to a player
+* `minetest.get_objects_inside_radius(pos, radius)`
+* `minetest.set_timeofday(val)`
+    * `val` is between `0` and `1`; `0` for midnight, `0.5` for midday
+* `minetest.get_timeofday()`
+* `minetest.get_gametime()`: returns the time, in seconds, since the world was created
+* `minetest.find_node_near(pos, radius, nodenames)`: returns pos or `nil`
+    * `nodenames`: e.g. `{"ignore", "group:tree"}` or `"default:dirt"`
+* `minetest.find_nodes_in_area(minp, maxp, nodenames)`: returns a list of positions
+    * `nodenames`: e.g. `{"ignore", "group:tree"}` or `"default:dirt"`
+* `minetest.get_perlin(noiseparams)`
+* `minetest.get_perlin(seeddiff, octaves, persistence, scale)`
+    * Return world-specific perlin noise (`int(worldseed)+seeddiff`)
+* `minetest.get_voxel_manip([pos1, pos2])`
+    * Return voxel manipulator object.
+    * Loads the manipulator from the map if positions are passed.
+* `minetest.set_gen_notify(flags, {deco_ids})`
+    * Set the types of on-generate notifications that should be collected
+    * `flags` is a flag field with the available flags: `dungeon`, `temple`, `cave_begin`,
+   `cave_end`, `large_cave_begin`, `large_cave_end`, `decoration`
+   * The second parameter is a list of IDS of decorations which notification is requested for
+* `minetest.get_mapgen_object(objectname)`
+    * Return requested mapgen object if available (see "Mapgen objects")
+* `minetest.get_mapgen_params()` Returns mapgen parameters, a table containing
+  `mgname`, `seed`, `chunksize`, `water_level`, and `flags`.
+* `minetest.set_mapgen_params(MapgenParams)`
+    * Set map generation parameters
+    * Function cannot be called after the registration period; only initialization and `on_mapgen_init`
+    * Takes a table as an argument with the fields `mgname`, `seed`, `water_level`, and `flags`.
+        * Leave field unset to leave that parameter unchanged
+        * `flags` contains a comma-delimited string of flags to set, or if the prefix `"no"` is attached, clears instead.
+        * `flags` is in the same format and has the same options as `mg_flags` in `minetest.conf`
+* `minetest.set_noiseparams(name, noiseparams, set_default)`
+    * Sets the noiseparams setting of `name` to the noiseparams table specified in `noiseparams`.
+    * `set_default` is an optional boolean (default: `true`) that specifies whether the setting
+      should be applied to the default config or current active config
+* `minetest.clear_objects()`
+    * clear all objects in the environments
+* `minetest.line_of_sight(pos1, pos2, stepsize)`: returns `boolean, pos`
+    * Check if there is a direct line of sight between `pos1` and `pos2`
+    * Returns the position of the blocking node when `false`
+    * `pos1`: First position
+    * `pos2`: Second position
+    * `stepsize`: smaller gives more accurate results but requires more computing
+      time. Default is `1`.
+* `minetest.find_path(pos1,pos2,searchdistance,max_jump,max_drop,algorithm)`
+    * returns table containing path
+    * returns a table of 3D points representing a path from `pos1` to `pos2` or `nil`
+    * `pos1`: start position
+    * `pos2`: end position
+    * `searchdistance`: number of blocks to search in each direction
+    * `max_jump`: maximum height difference to consider walkable
+    * `max_drop`: maximum height difference to consider droppable
+    * `algorithm`: One of `"A*_noprefetch"` (default), `"A*"`, `"Dijkstra"`
+* `minetest.spawn_tree (pos, {treedef})`
+    * spawns L-System tree at given `pos` with definition in `treedef` table
+* `minetest.transforming_liquid_add(pos)`
+    * add node to liquid update queue
+* `minetest.get_node_max_level(pos)`
+    * get max available level for leveled node
+* `minetest.get_node_level(pos)`
+    * get level of leveled node (water, snow)
+* `minetest.set_node_level(pos, level)`
+    * set level of leveled node, default `level` equals `1`
+    * if `totallevel > maxlevel`, returns rest (`total-max`).
+* `minetest.add_node_level(pos, level)`
+    * increase level of leveled node by level, default `level` equals `1`
+    * if `totallevel > maxlevel`, returns rest (`total-max`)
+    * can be negative for decreasing
+
+### Inventory
+`minetest.get_inventory(location)`: returns an `InvRef`
+
+* `location` = e.g.
+    * `{type="player", name="celeron55"}`
+    * `{type="node", pos={x=, y=, z=}}`
+    * `{type="detached", name="creative"}`
+* `minetest.create_detached_inventory(name, callbacks)`: returns an `InvRef`
+    * callbacks: See "Detached inventory callbacks"
+    * Creates a detached inventory. If it already exists, it is cleared.
+
+### Formspec
+* `minetest.show_formspec(playername, formname, formspec)`
+    * `playername`: name of player to show formspec
+    * `formname`: name passed to `on_player_receive_fields` callbacks.
+      It should follow the `"modname:<whatever>"` naming convention
+    * `formspec`: formspec to display
+* `minetest.formspec_escape(string)`: returns a string
+    * escapes the characters "[", "]", "\", "," and ";", which can not be used in formspecs
+* `minetest.explode_table_event(string)`: returns a table
+    * returns e.g. `{type="CHG", row=1, column=2}`
+    * `type` is one of:
+        * `"INV"`: no row selected)
+        * `"CHG"`: selected)
+        * `"DCL"`: double-click
+* `minetest.explode_textlist_event(string)`: returns a table
+    * returns e.g. `{type="CHG", index=1}`
+    * `type` is one of:
+        * `"INV"`: no row selected)
+        * `"CHG"`: selected)
+        * `"DCL"`: double-click
+* `minetest.explode_scrollbar_event(string)`: returns a table
+    * returns e.g. `{type="CHG", value=500}`
+    * `type` is one of:
+        * `"INV"`: something failed
+        * `"CHG"`: has been changed
+        * `"VAL"`: not changed
+
+### Item handling
+* `minetest.inventorycube(img1, img2, img3)`
+    * Returns a string for making an image of a cube (useful as an item image)
+* `minetest.get_pointed_thing_position(pointed_thing, above)`
+    * Get position of a `pointed_thing` (that you can get from somewhere)
+* `minetest.dir_to_facedir(dir, is6d)`
+    * Convert a vector to a facedir value, used in `param2` for `paramtype2="facedir"`;
+    * passing something non-`nil`/`false` for the optional second parameter causes it to take the y component into account
+* `minetest.facedir_to_dir(facedir)`
+    * Convert a facedir back into a vector aimed directly out the "back" of a node
+* `minetest.dir_to_wallmounted(dir)`
+    * Convert a vector to a wallmounted value, used for `paramtype2="wallmounted"`
+* `minetest.get_node_drops(nodename, toolname)`
+    * Returns list of item names.
+    * **Note**: This will be removed or modified in a future version.
+* `minetest.get_craft_result(input)`: returns `output, decremented_input`
+    * `input.method` = `"normal"` or `"cooking"` or `"fuel"`
+    * `input.width` = for example `3`
+    * `input.items` = for example
+      `{ stack1, stack2, stack3, stack4, stack 5, stack 6, stack 7, stack 8, stack 9 }`
+    * `output.item` = `ItemStack`, if unsuccessful: empty `ItemStack`
+    * `output.time` = a number, if unsuccessful: `0`
+    * `decremented_input` = like `input`
+* `minetest.get_craft_recipe(output)`: returns input
+    * returns last registered recipe for output item (node)
+    * `output` is a node or item type such as `"default:torch"`
+    * `input.method` = `"normal"` or `"cooking"` or `"fuel"`
+    * `input.width` = for example `3`
+    * `input.items` = for example
+      `{ stack1, stack2, stack3, stack4, stack 5, stack 6, stack 7, stack 8, stack 9 }`
+      * `input.items` = `nil` if no recipe found
+* `minetest.get_all_craft_recipes(query item)`: returns a table or `nil`
+    * returns indexed table with all registered recipes for query item (node)
+      or `nil` if no recipe was found
+    * recipe entry table:
+            {
+                method = 'normal' or 'cooking' or 'fuel'
+                width = 0-3, 0 means shapeless recipe
+                items = indexed [1-9] table with recipe items
+                output = string with item name and quantity
+            }
+    * Example query for `"default:gold_ingot"` will return table:
+            {
+                [1]={type = "cooking", width = 3, output = "default:gold_ingot",
+                items = {1 = "default:gold_lump"}},
+                [2]={type = "normal", width = 1, output = "default:gold_ingot 9",
+                items = {1 = "default:goldblock"}}
+            }
+* `minetest.handle_node_drops(pos, drops, digger)`
+    * `drops`: list of itemstrings
+    * Handles drops from nodes after digging: Default action is to put them into
+      digger's inventory
+    * Can be overridden to get different functionality (e.g. dropping items on
+      ground)
+
+### Rollback
+* `minetest.rollback_get_node_actions(pos, range, seconds, limit)`: returns `{{actor, pos, time, oldnode, newnode}, ...}`
+    * Find who has done something to a node, or near a node
+    * `actor`: `"player:<name>"`, also `"liquid"`.
+* `minetest.rollback_revert_actions_by(actor, seconds)`: returns `boolean, log_messages`
+    * Revert latest actions of someone
+    * `actor`: `"player:<name>"`, also `"liquid"`.
+
+### Defaults for the `on_*` item definition functions
+These functions return the leftover itemstack.
+
+* `minetest.item_place_node(itemstack, placer, pointed_thing, param2)`
+    * Place item as a node
+    * `param2` overrides `facedir` and wallmounted `param2`
+    * returns `itemstack, success`
+* `minetest.item_place_object(itemstack, placer, pointed_thing)`
+    * Place item as-is
+* `minetest.item_place(itemstack, placer, pointed_thing, param2)`
+    * Use one of the above based on what the item is.
+    * Calls `on_rightclick` of `pointed_thing.under` if defined instead
+    * **Note**: is not called when wielded item overrides `on_place`
+    * `param2` overrides `facedir` and wallmounted `param2`
+    * returns `itemstack, success`
+* `minetest.item_drop(itemstack, dropper, pos)`
+    * Drop the item
+* `minetest.item_eat(hp_change, replace_with_item)`
+    * Eat the item. `replace_with_item` can be `nil`.
+
+### Defaults for the `on_punch` and `on_dig` node definition callbacks
+* `minetest.node_punch(pos, node, puncher, pointed_thing)`
+    * Calls functions registered by `minetest.register_on_punchnode()`
+* `minetest.node_dig(pos, node, digger)`
+    * Checks if node can be dug, puts item into inventory, removes node
+    * Calls functions registered by `minetest.registered_on_dignodes()`
+
+### Sounds
+* `minetest.sound_play(spec, parameters)`: returns a handle
+    * `spec` is a `SimpleSoundSpec`
+    * `parameters` is a sound parameter table
+* `minetest.sound_stop(handle)`
+
+### Timing
+* `minetest.after(time, func, ...)`
+    * Call the function `func` after `time` seconds
+    * Optional: Variable number of arguments that are passed to `func`
+
+### Server
+* `minetest.request_shutdown()`: request for server shutdown
+* `minetest.get_server_status()`: returns server status string
+
+### Bans
+* `minetest.get_ban_list()`: returns the ban list (same as `minetest.get_ban_description("")`)
+* `minetest.get_ban_description(ip_or_name)`: returns ban description (string)
+* `minetest.ban_player(name)`: ban a player
+* `minetest.unban_player_or_ip(name)`: unban player or IP address
+* `minetest.kick_player(name, [reason])`: disconnect a player with a optional reason
+
+### Particles
+* `minetest.add_particle(particle definition)`
+    * Deprecated: `minetest.add_particle(pos, velocity, acceleration, expirationtime,
+      size, collisiondetection, texture, playername)`
+
+* `minetest.add_particlespawner(particlespawner definition)`
+    * Add a `ParticleSpawner`, an object that spawns an amount of particles over `time` seconds
+    * Returns an `id`
+    * `Deprecated: minetest.add_particlespawner(amount, time,
+      minpos, maxpos,
+      minvel, maxvel,
+      minacc, maxacc,
+      minexptime, maxexptime,
+      minsize, maxsize,
+      collisiondetection, texture, playername)`
+
+* `minetest.delete_particlespawner(id, player)``
+    * Delete `ParticleSpawner` with `id` (return value from `minetest.add_particlespawner`)
+    * If playername is specified, only deletes on the player's client,
+    * otherwise on all clients
+
+### Schematics
+* `minetest.create_schematic(p1, p2, probability_list, filename, slice_prob_list)`
+    * Create a schematic from the volume of map specified by the box formed by p1 and p2.
+    * Apply the specified probability values to the specified nodes in `probability_list`.
+        * `probability_list` is an array of tables containing two fields, `pos` and `prob`.
+            * `pos` is the 3D vector specifying the absolute coordinates of the node being modified,
+            * `prob` is the integer value from `0` to `255` of the probability (see: Schematic specifier).
+            * If there are two or more entries with the same pos value, the last entry is used.
+            * If `pos` is not inside the box formed by `p1` and `p2`, it is ignored.
+            * If `probability_list` equals `nil`, no probabilities are applied.
+            * Slice probability works in the same manner, except takes a field called `ypos` instead which indicates
+              the y position of the slice with a probability applied.
+            * If slice probability list equals `nil`, no slice probabilities are applied.
+    * Saves schematic in the Minetest Schematic format to filename.
+
+* `minetest.place_schematic(pos, schematic, rotation, replacements, force_placement)`
+    * Place the schematic specified by schematic (see: Schematic specifier) at `pos`.
+    * `rotation` can equal `"0"`, `"90"`, `"180"`, `"270"`, or `"random"`.
+    * If the `rotation` parameter is omitted, the schematic is not rotated.
+    * `replacements` = `{["old_name"] = "convert_to", ...}`
+    * `force_placement` is a boolean indicating whether nodes other than `air` and
+      `ignore` are replaced by the schematic
+
+### Misc.
+* `minetest.get_connected_players()`: returns list of `ObjectRefs`
+* `minetest.hash_node_position({x=,y=,z=})`: returns an 48-bit integer
+    * Gives a unique hash number for a node position (16+16+16=48bit)
+* `minetest.get_position_from_hash(hash)`: returns a position
+    * Inverse transform of `minetest.hash_node_position`
+* `minetest.get_item_group(name, group)`: returns a rating
+    * Get rating of a group of an item. (`0` means: not in group)
+* `minetest.get_node_group(name, group)`: returns a rating
+    * Deprecated: An alias for the former.
+* `minetest.get_content_id(name)`: returns an integer
+    * Gets the internal content ID of `name`
+* `minetest.get_name_from_content_id(content_id)`: returns a string
+    * Gets the name of the content with that content ID
+* `minetest.parse_json(string[, nullvalue])`: returns something
+    * Convert a string containing JSON data into the Lua equivalent
+    * `nullvalue`: returned in place of the JSON null; defaults to `nil`
+    * On success returns a table, a string, a number, a boolean or `nullvalue`
+    * On failure outputs an error message and returns `nil`
+    * Example: `parse_json("[10, {\"a\":false}]")`, returns `{10, {a = false}}`
+* `minetest.write_json(data[, styled])`: returns a string or `nil` and an error message
+    * Convert a Lua table into a JSON string
+    * styled: Outputs in a human-readable format if this is set, defaults to false
+    * Unserializable things like functions and userdata are saved as null.
+    * **Warning**: JSON is more strict than the Lua table format.
+        1. You can only use strings and positive integers of at least one as keys.
+        2. You can not mix string and integer keys.
+           This is due to the fact that JSON has two distinct array and object values.
+    * Example: `write_json({10, {a = false}})`, returns `"[10, {\"a\": false}]"`
+* `minetest.serialize(table)`: returns a string
+    * Convert a table containing tables, strings, numbers, booleans and `nil`s
+      into string form readable by `minetest.deserialize`
+    * Example: `serialize({foo='bar'})`, returns `'return { ["foo"] = "bar" }'`
+* `minetest.deserialize(string)`: returns a table
+    * Convert a string returned by `minetest.deserialize` into a table
+    * `string` is loaded in an empty sandbox environment.
+    * Will load functions, but they cannot access the global environment.
+    * Example: `deserialize('return { ["foo"] = "bar" }')`, returns `{foo='bar'}`
+    * Example: `deserialize('print("foo")')`, returns `nil` (function call fails)
+        * `error:[string "print("foo")"]:1: attempt to call global 'print' (a nil value)`
+* `minetest.compress(data, method, ...)`: returns `compressed_data`
+    * Compress a string of data.
+    * `method` is a string identifying the compression method to be used.
+    * Supported compression methods:
+    *     Deflate (zlib): `"deflate"`
+    * `...` indicates method-specific arguments.  Currently defined arguments are:
+    *     Deflate: `level` - Compression level, `0`-`9` or `nil`.
+* `minetest.decompress(compressed_data, method, ...)`: returns data
+    * Decompress a string of data (using ZLib).
+    * See documentation on `minetest.compress()` for supported compression methods.
+    * currently supported.
+    * `...` indicates method-specific arguments. Currently, no methods use this.
+* `minetest.is_protected(pos, name)`: returns boolean
+    * This function should be overridden by protection mods and should be used to
+      check if a player can interact at a position.
+    * This function should call the old version of itself if the position is not
+      protected by the mod.
+    * Example:
+
+            local old_is_protected = minetest.is_protected
+            function minetest.is_protected(pos, name)
+                if mymod:position_protected_from(pos, name) then
+                    return true
+                end
+                    return old_is_protected(pos, name)
+            end
+* `minetest.record_protection_violation(pos, name)`
+     * This function calls functions registered with
+       `minetest.register_on_protection_violation`.
+* `minetest.rotate_and_place(itemstack, placer, pointed_thing, infinitestacks, orient_flags)`
+    * Attempt to predict the desired orientation of the facedir-capable node
+      defined by `itemstack`, and place it accordingly (on-wall, on the floor, or
+      hanging from the ceiling). Stacks are handled normally if the `infinitestacks`
+      field is false or omitted (else, the itemstack is not changed). `orient_flags`
+      is an optional table containing extra tweaks to the placement code:
+        * `invert_wall`:   if `true`, place wall-orientation on the ground and ground-
+    orientation on the wall.
+        * `force_wall` :   if `true`, always place the node in wall orientation.
+        * `force_ceiling`: if `true`, always place on the ceiling.
+        * `force_floor`:   if `true`, always place the node on the floor.
+        * `force_facedir`: if `true`, forcefully reset the facedir to north when placing on
+          the floor or ceiling
+        * The first four options are mutually-exclusive; the last in the list takes
+          precedence over the first.
+
+
+
+* `minetest.rotate_node(itemstack, placer, pointed_thing)`
+     * calls `rotate_and_place()` with infinitestacks set according to the state of
+       the creative mode setting, and checks for "sneak" to set the `invert_wall`
+       parameter.
+
+* `minetest.forceload_block(pos)`
+    * forceloads the position `pos`.
+    * returns `true` if area could be forceloaded
+
+* `minetest.forceload_free_block(pos)`
+    * stops forceloading the position `pos`
 
 Please note that forceloaded areas are saved when the server restarts.
 
-Global objects:
-minetest.env - EnvRef of the server environment and world.
-^ Any function in the minetest namespace can be called using the syntax
-    minetest.env:somefunction(somearguments)
-  instead of
-    minetest.somefunction(somearguments)
-^ Deprecated, but support is not to be dropped soon
-
-Global tables:
-minetest.registered_items
-^ List of registered items, indexed by name
-minetest.registered_nodes
-^ List of registered node definitions, indexed by name
-minetest.registered_craftitems
-^ List of registered craft item definitions, indexed by name
-minetest.registered_tools
-^ List of registered tool definitions, indexed by name
-minetest.registered_entities
-^ List of registered entity prototypes, indexed by name
-minetest.object_refs
-^ List of object references, indexed by active object id
-minetest.luaentities
-^ List of Lua entities, indexed by active object id
+### Global objects
+* `minetest.env`: `EnvRef` of the server environment and world.
+    * Any function in the minetest namespace can be called using the syntax
+     `minetest.env:somefunction(somearguments)`
+     instead of `minetest.somefunction(somearguments)`
+   * Deprecated, but support is not to be dropped soon
+
+### Global tables
+* `minetest.registered_items`
+    * List of registered items, indexed by name
+* `minetest.registered_nodes`
+    * List of registered node definitions, indexed by name
+* `minetest.registered_craftitems`
+    * List of registered craft item definitions, indexed by name
+* `minetest.registered_tools`
+    * List of registered tool definitions, indexed by name
+* `minetest.registered_entities`
+    * List of registered entity prototypes, indexed by name
+* `minetest.object_refs`
+    * List of object references, indexed by active object id
+* `minetest.luaentities`
+    * List of Lua entities, indexed by active object id
 
 Class reference
-----------------
-NodeMetaRef: Node metadata - reference extra data and functionality stored
-             in a node
-- Can be gotten via minetest.get_meta(pos)
-methods:
-- set_string(name, value)
-- get_string(name)
-- set_int(name, value)
-- get_int(name)
-- set_float(name, value)
-- get_float(name)
-- get_inventory() -> InvRef
-- to_table() -> nil or {fields = {...}, inventory = {list1 = {}, ...}}
-- from_table(nil or {})
-  ^ See "Node Metadata"
-
-NodeTimerRef: Node Timers - a high resolution persistent per-node timer
-- Can be gotten via minetest.get_node_timer(pos)
-methods:
-- set(timeout,elapsed)
-  ^ set a timer's state
-  ^ timeout is in seconds, and supports fractional values (0.1 etc)
-  ^ elapsed is in seconds, and supports fractional values (0.1 etc)
-  ^ will trigger the node's on_timer function after timeout-elapsed seconds
-- start(timeout)
-  ^ start a timer
-  ^ equivalent to set(timeout,0)
-- stop()
-  ^ stops the timer
-- get_timeout() -> current timeout in seconds
-  ^ if timeout is 0, timer is inactive
-- get_elapsed() -> current elapsed time in seconds
-  ^ the node's on_timer function will be called after timeout-elapsed seconds
-- is_started() -> boolean state of timer
-  ^ returns true if timer is started, otherwise false
-
-ObjectRef: Moving things in the game are generally these
-(basically reference to a C++ ServerActiveObject)
-methods:
-- remove(): remove object (after returning from Lua)
-- getpos() -> {x=num, y=num, z=num}
-- setpos(pos); pos={x=num, y=num, z=num}
-- moveto(pos, continuous=false): interpolated move
-- punch(puncher, time_from_last_punch, tool_capabilities, direction)
-  ^ puncher = an another ObjectRef,
-  ^ time_from_last_punch = time since last punch action of the puncher
-  ^ direction: can be nil
-- right_click(clicker); clicker = an another ObjectRef
-- get_hp(): returns number of hitpoints (2 * number of hearts)
-- set_hp(hp): set number of hitpoints (2 * number of hearts)
-- get_inventory() -> InvRef
-- get_wield_list(): returns the name of the inventory list the wielded item is in
-- get_wield_index(): returns the index of the wielded item
-- get_wielded_item() -> ItemStack
-- set_wielded_item(item): replaces the wielded item, returns true if successful
-- set_armor_groups({group1=rating, group2=rating, ...})
-- set_animation({x=1,y=1}, frame_speed=15, frame_blend=0)
-- set_attach(parent, bone, position, rotation)
-  ^ bone = string
-  ^ position = {x=num, y=num, z=num} (relative)
-  ^ rotation = {x=num, y=num, z=num}
-- set_detach()
-- set_bone_position(bone, position, rotation)
-  ^ bone = string
-  ^ position = {x=num, y=num, z=num} (relative)
-  ^ rotation = {x=num, y=num, z=num}
-- set_properties(object property table)
-LuaEntitySAO-only: (no-op for other objects)
-- setvelocity({x=num, y=num, z=num})
-- getvelocity() -> {x=num, y=num, z=num}
-- setacceleration({x=num, y=num, z=num})
-- getacceleration() -> {x=num, y=num, z=num}
-- setyaw(radians)
-- getyaw() -> radians
-- settexturemod(mod)
-- setsprite(p={x=0,y=0}, num_frames=1, framelength=0.2,
--           select_horiz_by_yawpitch=false)
-  ^ Select sprite from spritesheet with optional animation and DM-style
-    texture selection based on yaw relative to camera
-- get_entity_name() (DEPRECATED: Will be removed in a future version)
-- get_luaentity()
-Player-only: (no-op for other objects)
-- is_player(): true for players, false for others
-- get_player_name(): returns "" if is not a player
-- get_look_dir(): get camera direction as a unit vector
-- get_look_pitch(): pitch in radians
-- get_look_yaw(): yaw in radians (wraps around pretty randomly as of now)
-- set_look_pitch(radians): sets look pitch
-- set_look_yaw(radians): sets look yaw
-- get_breath() : returns players breath
-- set_breath(value) : sets players breath
-    values: 0    player is drowning,
-            1-10 number of bubbles remain,
-            11   bubbles bar is not shown
-- set_inventory_formspec(formspec)
-  ^ Redefine player's inventory form
-  ^ Should usually be called in on_joinplayer
-- get_inventory_formspec() -> formspec string
-- get_player_control(): returns table with player pressed keys
-    {jump=bool,right=bool,left=bool,LMB=bool,RMB=bool,sneak=bool,aux1=bool,down=bool,up=bool}
-- get_player_control_bits(): returns integer with bit packed player pressed keys
-    bit nr/meaning: 0/up ,1/down ,2/left ,3/right ,4/jump ,5/aux1 ,6/sneak ,7/LMB ,8/RMB
-- set_physics_override({
-    speed = 1.0, -- multiplier to default value
-    jump = 1.0, -- multiplier to default value
-    gravity = 1.0, -- multiplier to default value
-    sneak = true, -- whether player can sneak
-    sneak_glitch = true, -- whether player can use the sneak glitch
-  })
-- hud_add(hud definition): add a HUD element described by HUD def, returns ID number on success
-- hud_remove(id): remove the HUD element of the specified id
-- hud_change(id, stat, value): change a value of a previously added HUD element
-  ^ element stat values: position, name, scale, text, number, item, dir
-- hud_get(id): gets the HUD element definition structure of the specified ID
-- hud_set_flags(flags): sets specified HUD flags to true/false
-  ^ flags: (is visible) hotbar, healthbar, crosshair, wielditem
-  ^ pass a table containing a true/false value of each flag to be set or unset
-  ^ if a flag is nil, the flag is not modified
-- hud_get_flags(): returns a table containing status of hud flags
-  ^ returns { hotbar=true, healthbar=true, crosshair=true, wielditem=true, breathbar=true }
-- hud_set_hotbar_itemcount(count): sets number of items in builtin hotbar
-  ^ count: number of items, must be between 1 and 23
-- hud_set_hotbar_image(texturename)
-  ^ sets background image for hotbar
-- hud_set_hotbar_selected_image(texturename)
-  ^ sets image for selected item of hotbar
-- hud_replace_builtin(name, hud definition)
-  ^ replace definition of a builtin hud element
-  ^ name: "breath" or "health"
-  ^ hud definition: definition to replace builtin definition
-- set_sky(bgcolor, type, {texture names})
-  ^ bgcolor: {r=0...255, g=0...255, b=0...255} or nil, defaults to white
-  ^ Available types:
-    - "regular": Uses 0 textures, bgcolor ignored
-    - "skybox": Uses 6 textures, bgcolor used
-    - "plain": Uses 0 textures, bgcolor used
-  ^ Note: currently does not work directly in on_joinplayer; use
-          minetest.after(0) in there.
-- override_day_night_ratio(ratio or nil)
-  ^ 0...1: Overrides day-night ratio, controlling sunlight to a specific amount
-  ^ nil: Disables override, defaulting to sunlight based on day-night cycle
-- set_local_animation({x=0, y=79}, {x=168, y=187}, {x=189, y=198}, {x=200, y=219}, frame_speed=30): set animation for player model in third person view
-  ^ stand/idle animation key frames
-  ^ walk animation key frames
-  ^ dig animation key frames
-  ^ walk+dig animation key frames
-  ^ animation frame speed
-- set_eye_offset({x=0,y=0,z=0},{x=0,y=0,z=0}): defines offset value for camera per player
-  ^ in first person view
-  ^ in third person view (max. values {x=-10/10,y=-10,15,z=-5/5})
-
-InvRef: Reference to an inventory
-methods:
-- is_empty(listname): return true if list is empty
-- get_size(listname): get size of a list
-- set_size(listname, size): set size of a list
-  ^ returns false on error (e.g. invalid listname or listsize)
-- get_width(listname): get width of a list
-- set_width(listname, width): set width of list; currently used for crafting
-- get_stack(listname, i): get a copy of stack index i in list
-- set_stack(listname, i, stack): copy stack to index i in list
-- get_list(listname): return full list
-- set_list(listname, list): set full list (size will not change)
-- get_lists(): returns list of inventory lists
-- set_lists(lists): sets inventory lists (size will not change)
-- add_item(listname, stack): add item somewhere in list, returns leftover ItemStack
-- room_for_item(listname, stack): returns true if the stack of items
-    can be fully added to the list
-- contains_item(listname, stack): returns true if the stack of items
-    can be fully taken from the list
-- remove_item(listname, stack): take as many items as specified from the list,
-    returns the items that were actually removed (as an ItemStack) - note that
-    any item metadata is ignored, so attempting to remove a specific unique
-    item this way will likely remove the wrong one - to do that use set_stack
-    with an empty ItemStack
-- get_location() -> location compatible to minetest.get_inventory(location)
-                 -> {type="undefined"} in case location is not known
-
-ItemStack: A stack of items.
-- Can be created via ItemStack(itemstack or itemstring or table or nil)
-methods:
-- is_empty(): return true if stack is empty
-- get_name(): returns item name (e.g. "default:stone")
-- set_name(itemname): returns true/false (success)
-  ^ clears item on failure
-- get_count(): returns number of items on the stack
-- set_count(count): returns true/false (success)
-  ^ clears item on failure
-- get_wear(): returns tool wear (0-65535), 0 for non-tools
-- set_wear(wear): returns true/false (success)
-  ^ clears item on failure
-- get_metadata(): returns metadata (a string attached to an item stack)
-- set_metadata(metadata): returns true
-- clear(): removes all items from the stack, making it empty
-- replace(item): replace the contents of this stack (item can also
-    be an itemstring or table)
-- to_string(): returns the stack in itemstring form
-- to_table(): returns the stack in Lua table form
-- get_stack_max(): returns the maximum size of the stack (depends on the item)
-- get_free_space(): returns get_stack_max() - get_count()
-- is_known(): returns true if the item name refers to a defined item type
-- get_definition(): returns the item definition table
-- get_tool_capabilities(): returns the digging properties of the item,
-  ^ or those of the hand if none are defined for this item type
-- add_wear(amount): increases wear by amount if the item is a tool
-- add_item(item): put some item or stack onto this stack,
-  ^ returns leftover ItemStack
-- item_fits(item): returns true if item or stack can be fully added to this one
-- take_item(n): take (and remove) up to n items from this stack
-  ^ returns taken ItemStack
-  ^ if n is omitted, n=1 is used
-- peek_item(n): copy (don't remove) up to n items from this stack
-  ^ returns copied ItemStack
-  ^ if n is omitted, n=1 is used
-
-PseudoRandom: A pseudorandom number generator
-- Can be created via PseudoRandom(seed)
-methods:
-- next(): return next integer random number [0...32767]
-- next(min, max): return next integer random number [min...max]
-                  (max - min) must be 32767 or <= 6553 due to the simple
-                  implementation making bad distribution otherwise.
-
-PerlinNoise: A perlin noise generator
-- Can be created via PerlinNoise(seed, octaves, persistence, scale) or PerlinNoise(noiseparams)
-- Also minetest.get_perlin(seeddiff, octaves, persistence, scale) or minetest.get_perlin(noiseparams)
-methods:
-- get2d(pos) -> 2d noise value at pos={x=,y=}
-- get3d(pos) -> 3d noise value at pos={x=,y=,z=}
-
-PerlinNoiseMap: A fast, bulk perlin noise generator
-- Can be created via PerlinNoiseMap(noiseparams, size)
-- Also minetest.get_perlin_map(noiseparams, size)
-- Format of 'size' for 3D perlin maps: {x=dimx, y=dimy, z=dimz}
-- Format of 'size' for 2D perlin maps: {x=dimx, y=dimy}
-  ^ where dimx, dimy, dimz are the array dimensions
-  ^ for 3D perlin maps the z component of 'size' must be larger than 1 otherwise 'nil' is returned
-methods:
-- get2dMap(pos) -> <size.x>X<size.y> 2d array of 2d noise values starting at pos={x=,y=}
-- get3dMap(pos) -> <size.x>X<size.y>X<size.z> 3d array of 3d noise values starting at pos={x=,y=,z=}
-- get2dMap_flat(pos) -> Flat <size.x * size.y> element array of 2d noise values starting at pos={x=,y=}
-- get3dMap_flat(pos) -> Same as get2dMap_flat, but 3d noise
-
-VoxelManip: An interface to the MapVoxelManipulator for Lua
-- Can be created via VoxelManip()
-- Also minetest.get_voxel_manip()
-- Specify a pmin, pmax to create a VoxelManip with map already loaded
-methods:
-- read_from_map(p1, p2):  Reads a chunk of map from the map containing the region formed by p1 and p2.
-  ^ returns actual emerged pmin, actual emerged pmax
-- write_to_map():  Writes the data loaded from the VoxelManip back to the map.
-  ^ important: data must be set using VoxelManip:set_data before calling this
-- get_node_at(pos): Returns a MapNode table of the node currently loaded in the VoxelManip at that position
-- set_node_at(pos, node): Sets a specific MapNode in the VoxelManip at that position
-- get_data():  Gets the data read into the VoxelManip object
-  ^ returns raw node data is in the form of an array of node content ids
-- set_data(data):  Sets the data contents of the VoxelManip object
-- update_map():  Update map after writing chunk back to map.
-  ^ To be used only by VoxelManip objects created by the mod itself; not a VoxelManip that was
-  ^ retrieved from minetest.get_mapgen_object
-- set_lighting(light, p1, p2):  Set the lighting within the VoxelManip to a uniform value
-  ^ light is a table, {day=<0...15>, night=<0...15>}
-  ^ To be used only by a VoxelManip object from minetest.get_mapgen_object
-  ^ (p1, p2) is the area in which lighting is set; defaults to the whole area if left out
-- get_light_data(): Gets the light data read into the VoxelManip object
-  ^ Returns an array (indices 1 to volume) of integers ranging from 0 to 255
-  ^ Each value is the bitwise combination of day and night light values (0..15 each)
-  ^ light = day + (night * 16)
-- set_light_data(light_data):  Sets the param1 (light) contents of each node in the VoxelManip
-  ^ expects lighting data in the same format that get_light_data() returns
-- get_param2_data(): Gets the raw param2 data read into the VoxelManip object
-- set_param2_data(param2_data): Sets the param2 contents of each node in the VoxelManip
-- calc_lighting(p1, p2):  Calculate lighting within the VoxelManip
-  ^ To be used only by a VoxelManip object from minetest.get_mapgen_object
-  ^ (p1, p2) is the area in which lighting is set; defaults to the whole area if left out
-- update_liquids():  Update liquid flow
-- was_modified(): Returns true or false if the data in the voxel manipulator had been modified since
-  the last read from map, due to a call to minetest.set_data() on the loaded area elsewhere
-- get_emerged_area(): Returns actual emerged pmin, actual emerged pmax
-
-VoxelArea: A helper class for voxel areas
-- Can be created via VoxelArea:new{MinEdge=pmin, MaxEdge=pmax}
-- Coordinates are *inclusive*, like most other things in Minetest
-methods:
-- getExtent():  returns a 3d vector containing the size of the area formed by MinEdge and MaxEdge
-- getVolume():  returns the volume of the area formed by MinEdge and MaxEdge
-- index(x, y, z):  returns the index of an absolute position in a flat array starting at 1
-  ^ useful for things like VoxelManip, raw Schematic specifiers, PerlinNoiseMap:get2d/3dMap, and so on
-- indexp(p):  same as above, except takes a vector
-- position(i):  returns the absolute position vector corresponding to index i
-- contains(x, y, z):  check if (x,y,z) is inside area formed by MinEdge and MaxEdge
-- containsp(p):  same as above, except takes a vector
-- containsi(i):  same as above, except takes an index
-- iter(minx, miny, minz, maxx, maxy, maxz):  returns an iterator that returns indices
-  ^ from (minx,miny,minz) to (maxx,maxy,maxz) in the order of [z [y [x]]]
-- iterp(minp, maxp):  same as above, except takes a vector
-
-Settings: An interface to read config files in the format of minetest.conf
-- Can be created via Settings(filename)
-methods:
-- get(key) -> value
-- get_bool(key) -> boolean
-- set(key, value)
-- remove(key) -> success
-- get_names() -> {key1,...}
-- write() -> success
-  ^ write changes to file
-- to_table() -> {[key1]=value1,...}
+---------------
+
+### `NodeMetaRef`
+Node metadata: reference extra data and functionality stored in a node.  
+Can be gotten via `minetest.get_meta(pos)`.
+
+#### Methods
+* `set_string(name, value)`
+* `get_string(name)`
+* `set_int(name, value)`
+* `get_int(name)`
+* `set_float(name, value)`
+* `get_float(name)`
+* `get_inventory()`: returns `InvRef`
+* `to_table()`: returns `nil` or `{fields = {...}, inventory = {list1 = {}, ...}}`
+* `from_table(nil or {})`
+    * See "Node Metadata"
+
+### `NoteTimerRef`
+Node Timers: a high resolution persistent per-node timer.  
+Can be gotten via `minetest.get_node_timer(pos)`.
+
+#### Methods
+* `set(timeout,elapsed)`
+    * set a timer's state
+    * `timeout` is in seconds, and supports fractional values (0.1 etc)
+    * `elapsed` is in seconds, and supports fractional values (0.1 etc)
+    * will trigger the node's `on_timer` function after `timeout`-elapsed seconds
+* `start(timeout)`
+    * start a timer
+    * equivalent to `set(timeout,0)`
+* `stop()`
+    * stops the timer
+* `get_timeout()`: returns current timeout in seconds
+    * if `timeout` equals `0`, timer is inactive
+* `get_elapsed()`: returns current elapsed time in seconds
+    * the node's `on_timer` function will be called after `timeout`-elapsed seconds
+* `is_started()`: returns boolean state of timer
+    * returns `true` if timer is started, otherwise `false`
+
+### `ObjectRef`
+Moving things in the game are generally these.
+
+This is basically a reference to a C++ `ServerActiveObject`
+
+#### Methods
+* `remove()`: remove object (after returning from Lua)
+* `getpos()`: returns `{x=num, y=num, z=num}`
+* `setpos(pos)`; `pos`=`{x=num, y=num, z=num}`
+* `moveto(pos, continuous=false)`: interpolated move
+* `punch(puncher, time_from_last_punch, tool_capabilities, direction)`
+    * `puncher` = another `ObjectRef`,
+    * `time_from_last_punch` = time since last punch action of the puncher
+    * `direction`: can be `nil`
+* `right_click(clicker)`; `clicker` is another `ObjectRef`
+* `get_hp()`: returns number of hitpoints (2 * number of hearts)
+* `set_hp(hp)`: set number of hitpoints (2 * number of hearts)
+* `get_inventory()`: returns an `InvRef`
+* `get_wield_list()`: returns the name of the inventory list the wielded item is in
+* `get_wield_index()`: returns the index of the wielded item
+* `get_wielded_item()`: returns an `ItemStack`
+* `set_wielded_item(item)`: replaces the wielded item, returns `true` if successful
+* `set_armor_groups({group1=rating, group2=rating, ...})`
+* `set_animation({x=1,y=1}, frame_speed=15, frame_blend=0)`
+* `set_attach(parent, bone, position, rotation)`
+    * `bone`: string
+    * `position`: `{x=num, y=num, z=num}` (relative)
+    * `rotation`: `{x=num, y=num, z=num}`
+* `set_detach()`
+* `set_bone_position(bone, position, rotation)`
+    * `bone`: string
+    * `position`: `{x=num, y=num, z=num}` (relative)
+    * `rotation`: `{x=num, y=num, z=num}`
+* `set_properties(object property table)`
+
+##### LuaEntitySAO-only (no-op for other objects)
+* `setvelocity({x=num, y=num, z=num})`
+* `getvelocity()`: returns `{x=num, y=num, z=num}`
+* `setacceleration({x=num, y=num, z=num})`
+* `getacceleration()`: returns `{x=num, y=num, z=num}`
+* `setyaw(radians)`
+* `getyaw()`: returns number in radians
+* `settexturemod(mod)`
+* `setsprite(p={x=0,y=0}, num_frames=1, framelength=0.2,
+  select_horiz_by_yawpitch=false)`
+    * Select sprite from spritesheet with optional animation and DM-style
+      texture selection based on yaw relative to camera
+* `get_entity_name()` (**Deprecated**: Will be removed in a future version)
+* `get_luaentity()`
+
+##### Player-only (no-op for other objects)
+* `is_player()`: true for players, false for others
+* `get_player_name()`: returns `""` if is not a player
+* `get_look_dir()`: get camera direction as a unit vector
+* `get_look_pitch()`: pitch in radians
+* `get_look_yaw()`: yaw in radians (wraps around pretty randomly as of now)
+* `set_look_pitch(radians)`: sets look pitch
+* `set_look_yaw(radians)`: sets look yaw
+* `get_breath()`: returns players breath
+* `set_breath(value)`: sets players breath
+     * values:
+        * `0`: player is drowning,
+        * `1`-`10`: remaining number of bubbles
+        * `11`: bubbles bar is not shown
+* `set_inventory_formspec(formspec)`
+    * Redefine player's inventory form
+    * Should usually be called in on_joinplayer
+* `get_inventory_formspec()`: returns a formspec string
+* `get_player_control()`: returns table with player pressed keys
+    * `{jump=bool,right=bool,left=bool,LMB=bool,RMB=bool,sneak=bool,aux1=bool,down=bool,up=bool}`
+* `get_player_control_bits()`: returns integer with bit packed player pressed keys
+    * bit nr/meaning: 0/up ,1/down ,2/left ,3/right ,4/jump ,5/aux1 ,6/sneak ,7/LMB ,8/RMB
+* `set_physics_override(override_table)`
+    * `override_table` is a table with the following fields:
+        * `speed`: multiplier to default walking speed value (default: `1`)
+        * `jump`: multiplier to default jump value (default: `1`)
+        * `gravity`: multiplier to default gravity value (default: `1`)
+        * `sneak`: whether player can sneak (default: `true`)
+        * `sneak_glitch`: whether player can use the sneak glitch (default: `true`)
+* `hud_add(hud definition)`: add a HUD element described by HUD def, returns ID number on success
+* `hud_remove(id)`: remove the HUD element of the specified id
+* `hud_change(id, stat, value)`: change a value of a previously added HUD element
+    * element `stat` values: `position`, `name`, `scale`, `text`, `number`, `item`, `dir`
+* `hud_get(id)`: gets the HUD element definition structure of the specified ID
+* `hud_set_flags(flags)`: sets specified HUD flags to `true`/`false`
+    * `flags`: (is visible) `hotbar`, `healthbar`, `crosshair`, `wielditem`
+    * pass a table containing a `true`/`false` value of each flag to be set or unset
+    * if a flag equals `nil`, the flag is not modified
+* `hud_get_flags()`: returns a table containing status of hud flags
+    * returns `{ hotbar=true, healthbar=true, crosshair=true, wielditem=true, breathbar=true }`
+* `hud_set_hotbar_itemcount(count)`: sets number of items in builtin hotbar
+    * `count`: number of items, must be between `1` and `23`
+* `hud_set_hotbar_image(texturename)`
+    * sets background image for hotbar
+* `hud_set_hotbar_selected_image(texturename)`
+    * sets image for selected item of hotbar
+* `hud_replace_builtin(name, hud_definition)`
+    * replace definition of a builtin hud element
+    * `name`: `"breath"` or `"health"`
+    * `hud_definition`: definition to replace builtin definition
+* `set_sky(bgcolor, type, {texture names})`
+    * `bgcolor`: `{r=0...255, g=0...255, b=0...255}` or `nil`, defaults to white
+    * Available types:
+        * `"regular"`: Uses 0 textures, `bgcolor` ignored
+        * `"skybox"`: Uses 6 textures, `bgcolor` used
+        * `"plain"`: Uses 0 textures, `bgcolor` used
+    * **Note**: currently does not work directly in `on_joinplayer`; use
+      `minetest.after(0)` in there.
+* `override_day_night_ratio(ratio or nil)`
+    * `0`...`1`: Overrides day-night ratio, controlling sunlight to a specific amount
+    * `nil`: Disables override, defaulting to sunlight based on day-night cycle
+* `set_local_animation({x=0, y=79}, {x=168, y=187}, {x=189, y=198}, {x=200, y=219}, frame_speed=30)`: set animation for player model in third person view
+    * stand/idle animation key frames
+    * walk animation key frames
+    * dig animation key frames
+    * walk+dig animation key frames
+    * animation frame speed
+* `set_eye_offset({x=0,y=0,z=0},{x=0,y=0,z=0})`: defines offset value for camera per player
+    * in first person view
+    * in third person view (max. values `{x=-10/10,y=-10,15,z=-5/5}`)
+
+### `InvRef`
+An `InvRef` is a reference to an inventory.
+
+#### Methods
+* `is_empty(listname)`: return `true` if list is empty
+* `get_size(listname)`: get size of a list
+* `set_size(listname, size)`: set size of a list
+    * returns `false` on error (e.g. invalid `listname` or `size`)
+* `get_width(listname)`: get width of a list
+* `set_width(listname, width)`: set width of list; currently used for crafting
+* `get_stack(listname, i)`: get a copy of stack index `i` in list
+* `set_stack(listname, i, stack)`: copy `stack` to index `i` in list
+* `get_list(listname)`: return full list
+* `set_list(listname, list)`: set full list (size will not change)
+* `get_lists()`: returns list of inventory lists
+* `set_lists(lists)`: sets inventory lists (size will not change)
+* `add_item(listname, stack)`: add item somewhere in list, returns leftover `ItemStack`
+* `room_for_item(listname, stack):` returns `true` if the stack of items
+  can be fully added to the list
+* `contains_item(listname, stack)`: returns `true` if the stack of items
+  can be fully taken from the list
+* `remove_item(listname, stack)`: take as many items as specified from the list,
+  returns the items that were actually removed (as an `ItemStack`) -- note that
+  any item metadata is ignored, so attempting to remove a specific unique
+  item this way will likely remove the wrong one -- to do that use `set_stack`
+  with an empty `ItemStack`
+* `get_location()`: returns a location compatible to `minetest.get_inventory(location)`
+    * returns `{type="undefined"}` in case location is not known
+
+### `ItemStack`
+An `ItemStack` is a stack of items.
+
+It can be created via `ItemStack(x)`, where x is an `ItemStack`,
+an itemstring, a table or `nil`.
+
+#### Methods
+* `is_empty()`: Returns `true` if stack is empty.
+* `get_name()`: Returns item name (e.g. `"default:stone"`).
+* `set_name(item_name)`: Returns boolean success.
+  Clears item on failure.
+* `get_count()`: Returns number of items on the stack.
+* `set_count(count)`
+* `get_wear()`: Returns tool wear (`0`-`65535`), `0` for non-tools.
+* `set_wear(wear)`: Returns boolean success.
+  Clears item on failure.
+* `get_metadata()`: Returns metadata (a string attached to an item stack).
+* `set_metadata(metadata)`: Returns true.
+* `clear()`: removes all items from the stack, making it empty.
+* `replace(item)`: replace the contents of this stack.
+    * `item` can also be an itemstring or table.
+* `to_string()`: Returns the stack in itemstring form.
+* `to_table()`: Returns the stack in Lua table form.
+* `get_stack_max()`: Returns the maximum size of the stack (depends on the item).
+* `get_free_space()`: Returns `get_stack_max() - get_count()`.
+* `is_known()`: Returns `true` if the item name refers to a defined item type.
+* `get_definition()`: Returns the item definition table.
+* `get_tool_capabilities()`: Returns the digging properties of the item,
+  or those of the hand if none are defined for this item type
+* `add_wear(amount)`: Increases wear by `amount` if the item is a tool.
+* `add_item(item)`: Put some item or stack onto this stack.
+   Returns leftover `ItemStack`.
+* `item_fits(item)`: Returns `true` if item or stack can be fully added to
+  this one.
+* `take_item(n=1)`: Take (and remove) up to `n` items from this stack.
+  Returns taken `ItemStack`.
+* `peek_item(n=1)`: copy (don't remove) up to `n` items from this stack.
+  Returns taken `ItemStack`.
+
+### `PseudoRandom`
+A pseudorandom number generator.
+
+It can be created via `PseudoRandom(seed)`.
+
+#### Methods
+* `next()`: return next integer random number [`0`...`32767`]
+* `next(min, max)`: return next integer random number [`min`...`max`]
+    * `((max - min) == 32767) or ((max-min) <= 6553))` must be true
+      due to the simple implementation making bad distribution otherwise.
+
+### `PerlinNoise`
+A perlin noise generator.
+It can be created via `PerlinNoise(seed, octaves, persistence, scale)`
+or `PerlinNoise(noiseparams)`.  
+Alternatively with `minetest.get_perlin(seeddiff, octaves, persistence, scale)`
+or `minetest.get_perlin(noiseparams)`.
+
+#### Methods
+* `get2d(pos)`: returns 2D noise value at `pos={x=,y=}`
+* `get3d(pos)`: returns 3D noise value at `pos={x=,y=,z=}`
+
+### `PerlinNoiseMap`
+A fast, bulk perlin noise generator.
+
+It can be created via `PerlinNoiseMap(noiseparams, size)` or
+`minetest.get_perlin_map(noiseparams, size)`.
+
+Format of `size` is `{x=dimx, y=dimy, z=dimz}`.  The `z` conponent is ommitted
+for 2D noise, and it must be must be larger than 1 for 3D noise (otherwise
+`nil` is returned).
+
+#### Methods
+* `get2dMap(pos)`: returns a `<size.x>` times `<size.y>` 2D array of 2D noise
+  with values starting at `pos={x=,y=}`
+* `get3dMap(pos)`: returns a `<size.x>` times `<size.y>` times `<size.z>` 3D array
+  of 3D noise with values starting at `pos={x=,y=,z=}`
+* `get2dMap_flat(pos)`: returns a flat `<size.x * size.y>` element array of 2D noise with values starting at `pos={x=,y=}`
+* `get3dMap_flat(pos)`: Same as `get2dMap_flat`, but 3D noise
+
+### `VoxelManip`
+An interface to the `MapVoxelManipulator` for Lua.
+
+It can be created via `VoxelManip()` or `minetest.get_voxel_manip()`.
+The map will be pre-loaded if two positions are passed to either.
+
+#### Methods
+* `read_from_map(p1, p2)`:  Reads a chunk of map from the map containing the region formed by `p1` and `p2`.
+    * returns actual emerged `pmin`, actual emerged `pmax`
+* `write_to_map()`: Writes the data loaded from the `VoxelManip` back to the map.
+    * **important**: data must be set using `VoxelManip:set_data` before calling this
+* `get_node_at(pos)`: Returns a `MapNode` table of the node currently loaded in the `VoxelManip` at that position
+* `set_node_at(pos, node)`: Sets a specific `MapNode` in the `VoxelManip` at that position
+* `get_data()`: Gets the data read into the `VoxelManip` object
+    * returns raw node data is in the form of an array of node content IDs
+* `set_data(data)`: Sets the data contents of the `VoxelManip` object
+* `update_map()`: Update map after writing chunk back to map.
+    * To be used only by `VoxelManip` objects created by the mod itself; not a `VoxelManip` that was
+      retrieved from `minetest.get_mapgen_object`
+* `set_lighting(light, p1, p2)`: Set the lighting within the `VoxelManip` to a uniform value
+    * `light` is a table, `{day=<0...15>, night=<0...15>}`
+    * To be used only by a `VoxelManip` object from `minetest.get_mapgen_object`
+    * (`p1`, `p2`) is the area in which lighting is set; defaults to the whole area if left out
+* `get_light_data()`: Gets the light data read into the `VoxelManip` object
+    * Returns an array (indices 1 to volume) of integers ranging from `0` to `255`
+    * Each value is the bitwise combination of day and night light values (`0` to `15` each)
+    * `light = day + (night * 16)`
+* `set_light_data(light_data)`: Sets the `param1` (light) contents of each node in the `VoxelManip`
+    * expects lighting data in the same format that `get_light_data()` returns
+* `get_param2_data()`: Gets the raw `param2` data read into the `VoxelManip` object
+* `set_param2_data(param2_data)`: Sets the `param2` contents of each node in the `VoxelManip`
+* `calc_lighting(p1, p2)`:  Calculate lighting within the `VoxelManip`
+    * To be used only by a `VoxelManip` object from `minetest.get_mapgen_object`
+    * (`p1`, `p2`) is the area in which lighting is set; defaults to the whole area if left out
+* `update_liquids()`: Update liquid flow
+* `was_modified()`: Returns `true` or `false` if the data in the voxel manipulator had been modified since
+  the last read from map, due to a call to `minetest.set_data()` on the loaded area elsewhere
+* `get_emerged_area()`: Returns actual emerged minimum and maximum positions.
+
+### `VoxelArea`
+A helper class for voxel areas.
+It can be created via `VoxelArea:new{MinEdge=pmin, MaxEdge=pmax}`.
+The coordinates are *inclusive*, like most other things in Minetest.
+
+#### Methods
+* `getExtent()`: returns a 3D vector containing the size of the area formed by `MinEdge` and `MaxEdge`
+* `getVolume()`: returns the volume of the area formed by `MinEdge` and `MaxEdge`
+* `index(x, y, z)`: returns the index of an absolute position in a flat array starting at `1`
+    * useful for things like `VoxelManip`, raw Schematic specifiers, `PerlinNoiseMap:get2d`/`3dMap`, and so on
+* `indexp(p)`: same as above, except takes a vector
+* `position(i)`: returns the absolute position vector corresponding to index `i`
+* `contains(x, y, z)`: check if (`x`,`y`,`z`) is inside area formed by `MinEdge` and `MaxEdge`
+* `containsp(p)`: same as above, except takes a vector
+* `containsi(i)`: same as above, except takes an index `i`
+* `iter(minx, miny, minz, maxx, maxy, maxz)`: returns an iterator that returns indices
+    * from (`minx`,`miny`,`minz`) to (`maxx`,`maxy`,`maxz`) in the order of `[z [y [x]]]`
+* `iterp(minp, maxp)`: same as above, except takes a vector
+
+### `Settings`
+An interface to read config files in the format of `minetest.conf`.
+
+It can be created via `Settings(filename)`.
+
+#### Methods
+* `get(key)`: returns a value
+* `get_bool(key)`: returns a boolean
+* `set(key, value)`
+* `remove(key)`: returns a boolean (`true` for success)
+* `get_names()`: returns `{key1,...}`
+* `write()`: returns a boolean (`true` for success)
+    * write changes to file
+* `to_table()`: returns `{[key1]=value1,...}`
 
 Mapgen objects
----------------
-A mapgen object is a construct used in map generation.  Mapgen objects can be used by an on_generate
+--------------
+A mapgen object is a construct used in map generation. Mapgen objects can be used by an `on_generate`
 callback to speed up operations by avoiding unnecessary recalculations; these can be retrieved using the
-minetest.get_mapgen_object() function.  If the requested Mapgen object is unavailable, or
-get_mapgen_object() was called outside of an on_generate() callback, nil is returned.
+`minetest.get_mapgen_object()` function. If the requested Mapgen object is unavailable, or
+`get_mapgen_object()` was called outside of an `on_generate()` callback, `nil` is returned.
 
 The following Mapgen objects are currently available:
 
-- voxelmanip
-    This returns three values; the VoxelManip object to be used, minimum and maximum emerged position, in that
-order.  All mapgens support this object.
+### `voxelmanip`
+This returns three values; the `VoxelManip` object to be used, minimum and maximum emerged position, in that
+order. All mapgens support this object.
 
-- heightmap
-    Returns an array containing the y coordinates of the ground levels of nodes in the most recently
+### `heightmap`
+Returns an array containing the y coordinates of the ground levels of nodes in the most recently
 generated chunk by the current mapgen.
 
-- biomemap
-    Returns an array containing the biome IDs of nodes in the most recently generated chunk by the
+### `biomemap`
+Returns an array containing the biome IDs of nodes in the most recently generated chunk by the
 current mapgen.
 
-- heatmap
-    Returns an array containing the temperature values of nodes in the most recently generated chunk by
+### `heatmap`
+Returns an array containing the temperature values of nodes in the most recently generated chunk by
 the current mapgen.
 
-- humiditymap
-    Returns an array containing the humidity values of nodes in the most recently generated chunk by the
+### `humiditymap`
+Returns an array containing the humidity values of nodes in the most recently generated chunk by the
 current mapgen.
 
-- gennotify
-    Returns a table mapping requested generation notification types to arrays of positions at which the
-corresponding generated structures are located at within the current chunk.  To set the capture of positions
-of interest to be recorded on generate, use minetest.set_gen_notify().
+### `gennotify`
+Returns a table mapping requested generation notification types to arrays of positions at which the
+corresponding generated structures are located at within the current chunk. To set the capture of positions
+of interest to be recorded on generate, use `minetest.set_gen_notify()`.
+
 Possible fields of the table returned are:
-	dungeon, temple, cave_begin, cave_end, large_cave_begin, large_cave_end, decoration
-Decorations have a key in the format of "decoration#id", where id is the numeric unique decoration ID.
+
+* `dungeon`
+* `temple`
+* `cave_begin`
+* `cave_end`
+* `large_cave_begin`
+* `large_cave_end`
+* `decoration`
+
+Decorations have a key in the format of `"decoration#id"`, where `id` is the numeric unique decoration ID.
 
 Registered entities
---------------------
-- Functions receive a "luaentity" as self:
-  - It has the member .name, which is the registered name ("mod:thing")
-  - It has the member .object, which is an ObjectRef pointing to the object
-  - The original prototype stuff is visible directly via a metatable
-- Callbacks:
-  - on_activate(self, staticdata)
-    ^ Called when the object is instantiated.
-  - on_step(self, dtime)
-    ^ Called on every server tick, after movement and collision processing.
-      dtime is usually 0.1 seconds, as per the dedicated_server_step setting
-      in minetest.conf.
-  - on_punch(self, puncher, time_from_last_punch, tool_capabilities, dir)
-    ^ Called when somebody punches the object.
-    ^ Note that you probably want to handle most punches using the
-      automatic armor group system.
-    ^ puncher: ObjectRef (can be nil)
-    ^ time_from_last_punch: Meant for disallowing spamming of clicks (can be nil)
-    ^ tool_capabilities: capability table of used tool (can be nil)
-    ^ dir: unit vector of direction of punch. Always defined. Points from
-           the puncher to the punched.
-  - on_rightclick(self, clicker)
-  - get_staticdata(self)
-    ^ Should return a string that will be passed to on_activate when
-      the object is instantiated the next time.
+-------------------
+* Functions receive a "luaentity" as `self`:
+    * It has the member `.name`, which is the registered name `("mod:thing")`
+    * It has the member `.object`, which is an `ObjectRef` pointing to the object
+    * The original prototype stuff is visible directly via a metatable
+* Callbacks:
+    * `on_activate(self, staticdata)`
+        * Called when the object is instantiated.
+    * `on_step(self, dtime)`
+        * Called on every server tick, after movement and collision processing.
+          `dtime` is usually 0.1 seconds, as per the `dedicated_server_step` setting
+          `in minetest.conf`.
+    * `on_punch(self, puncher, time_from_last_punch, tool_capabilities, dir`
+        * Called when somebody punches the object.
+        * Note that you probably want to handle most punches using the
+          automatic armor group system.
+          * `puncher`: an `ObjectRef` (can be `nil`)
+          * `time_from_last_punch`: Meant for disallowing spamming of clicks (can be `nil`)
+          * `tool_capabilities`: capability table of used tool (can be `nil`)
+          * `dir`: unit vector of direction of punch. Always defined. Points from
+            the puncher to the punched.
+    * `on_rightclick(self, clicker)`
+    * `get_staticdata(self)`
+        * Should return a string that will be passed to `on_activate` when
+          the object is instantiated the next time.
 
 L-system trees
----------------
-treedef={
-  axiom,         - string  initial tree axiom
-  rules_a,       - string  rules set A
-  rules_b,       - string  rules set B
-  rules_c,       - string  rules set C
-  rules_d,       - string  rules set D
-  trunk,         - string  trunk node name
-  leaves,        - string  leaves node name
-  leaves2,       - string  secondary leaves node name
-  leaves2_chance,- num     chance (0-100) to replace leaves with leaves2
-  angle,         - num     angle in deg
-  iterations,    - num     max # of iterations, usually 2 -5
-  random_level,  - num     factor to lower nr of iterations, usually 0 - 3
-  trunk_type,    - string  single/double/crossed) type of trunk: 1 node, 2x2 nodes or 3x3 in cross shape
-  thin_branches, - boolean true -> use thin (1 node) branches
-  fruit,         - string  fruit node name
-  fruit_chance,  - num     chance (0-100) to replace leaves with fruit node
-  seed,          - num     random seed; if no seed is provided, the engine will create one
-  }
-
-Key for Special L-System Symbols used in Axioms
-  G  - move forward one unit with the pen up
-  F  - move forward one unit with the pen down drawing trunks and branches
-  f  - move forward one unit with the pen down drawing leaves (100% chance)
-  T  - move forward one unit with the pen down drawing trunks only
-  R  - move forward one unit with the pen down placing fruit
-  A  - replace with rules set A
-  B  - replace with rules set B
-  C  - replace with rules set C
-  D  - replace with rules set D
-  a  - replace with rules set A, chance 90%
-  b  - replace with rules set B, chance 80%
-  c  - replace with rules set C, chance 70%
-  d  - replace with rules set D, chance 60%
-  +  - yaw the turtle right by angle parameter
-  -  - yaw the turtle left by angle parameter
-  &  - pitch the turtle down by angle parameter
-  ^  - pitch the turtle up by angle parameter
-  /  - roll the turtle to the right by angle parameter
-  *  - roll the turtle to the left by angle parameter
-  [  - save in stack current state info
-  ]  - recover from stack state info
-
-Example usage: spawn small apple tree
-apple_tree={
-  axiom="FFFFFAFFBF",
-  rules_a="[&&&FFFFF&&FFFF][&&&++++FFFFF&&FFFF][&&&----FFFFF&&FFFF]",
-  rules_b="[&&&++FFFFF&&FFFF][&&&--FFFFF&&FFFF][&&&------FFFFF&&FFFF]",
-  trunk="default:tree",
-  leaves="default:leaves",
-  angle=30,
-  iterations=2,
-  random_level=0,
-  trunk_type="single",
-  thin_branches=true,
-  fruit_chance=10,
-  fruit="default:apple"
-  }
-minetest.spawn_tree(pos,apple_tree)
+--------------
+
+### Tree definition
+
+    treedef={
+        axiom,         --string  initial tree axiom
+        rules_a,       --string  rules set A
+        rules_b,       --string  rules set B
+        rules_c,       --string  rules set C
+        rules_d,       --string  rules set D
+        trunk,         --string  trunk node name
+        leaves,        --string  leaves node name
+        leaves2,       --string  secondary leaves node name
+        leaves2_chance,--num     chance (0-100) to replace leaves with leaves2
+        angle,         --num     angle in deg
+        iterations,    --num     max # of iterations, usually 2 -5
+        random_level,  --num     factor to lower nr of iterations, usually 0 - 3
+        trunk_type,    --string  single/double/crossed) type of trunk: 1 node, 2x2 nodes or 3x3 in cross shape
+        thin_branches, --boolean true -> use thin (1 node) branches
+        fruit,         --string  fruit node name
+        fruit_chance,  --num     chance (0-100) to replace leaves with fruit node
+        seed,          --num     random seed; if no seed is provided, the engine will create one
+    }
+
+### Key for Special L-System Symbols used in Axioms
+
+* `G`: move forward one unit with the pen up
+* `F`: move forward one unit with the pen down drawing trunks and branches
+* `f`: move forward one unit with the pen down drawing leaves (100% chance)
+* `T`: move forward one unit with the pen down drawing trunks only
+* `R`: move forward one unit with the pen down placing fruit
+* `A`: replace with rules set A
+* `B`: replace with rules set B
+* `C`: replace with rules set C
+* `D`: replace with rules set D
+* `a`: replace with rules set A, chance 90%
+* `b`: replace with rules set B, chance 80%
+* `c`: replace with rules set C, chance 70%
+* `d`: replace with rules set D, chance 60%
+* `+`: yaw the turtle right by `angle` parameter
+* `-`: yaw the turtle left by `angle` parameter
+* `&`: pitch the turtle down by `angle` parameter
+* `^`: pitch the turtle up by `angle` parameter
+* `/`: roll the turtle to the right by `angle` parameter
+* `*`: roll the turtle to the left by `angle` parameter
+* `[`: save in stack current state info
+* `]`: recover from stack state info
+
+### Example
+Spawn a small apple tree:
+
+    pos = {x=230,y=20,z=4}
+    apple_tree={
+        axiom="FFFFFAFFBF",
+        rules_a="[&&&FFFFF&&FFFF][&&&++++FFFFF&&FFFF][&&&----FFFFF&&FFFF]",
+        rules_b="[&&&++FFFFF&&FFFF][&&&--FFFFF&&FFFF][&&&------FFFFF&&FFFF]",
+        trunk="default:tree",
+        leaves="default:leaves",
+        angle=30,
+        iterations=2,
+        random_level=0,
+        trunk_type="single",
+        thin_branches=true,
+        fruit_chance=10,
+        fruit="default:apple"
+    }
+    minetest.spawn_tree(pos,apple_tree)
 
 Definition tables
-------------------
+-----------------
 
-Object Properties
-{
-    hp_max = 1,
-    physical = true,
-    collide_with_objects = true, -- collide with other objects if physical=true
-    weight = 5,
-    collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
-    visual = "cube"/"sprite"/"upright_sprite"/"mesh"/"wielditem",
-    visual_size = {x=1, y=1},
-    mesh = "model",
-    textures = {}, -- number of required textures depends on visual
-    colors = {}, -- number of required colors depends on visual
-    spritediv = {x=1, y=1},
-    initial_sprite_basepos = {x=0, y=0},
-    is_visible = true,
-    makes_footstep_sound = false,
-    automatic_rotate = false,
-    stepheight = 0,
-    automatic_face_movement_dir = 0.0,
-    ^ automatically set yaw to movement direction; offset in degrees; false to disable
-}
-
-Entity definition (register_entity)
-{
-    (Deprecated: Everything in object properties is read directly from here)
-
-    initial_properties = <initial object properties>,
-
-    on_activate = function(self, staticdata, dtime_s),
-    on_step = function(self, dtime),
-    on_punch = function(self, hitter),
-    on_rightclick = function(self, clicker),
-    get_staticdata = function(self),
-    ^ Called sometimes; the string returned is passed to on_activate when
-      the entity is re-activated from static state
-
-    # Also you can define arbitrary member variables here
-    myvariable = whatever,
-}
-
-ABM (ActiveBlockModifier) definition (register_abm)
-{
-    -- In the following two fields, also group:groupname will work.
-    nodenames = {"default:lava_source"},
-    neighbors = {"default:water_source", "default:water_flowing"}, -- (any of these)
-     ^ If left out or empty, any neighbor will do
-    interval = 1.0, -- (operation interval)
-    chance = 1, -- (chance of trigger is 1.0/this)
-    action = func(pos, node, active_object_count, active_object_count_wider),
-}
-
-Item definition (register_node, register_craftitem, register_tool)
-{
-    description = "Steel Axe",
-    groups = {}, -- key=name, value=rating; rating=1..3.
-                    if rating not applicable, use 1.
-                    e.g. {wool=1, fluffy=3}
-                        {soil=2, outerspace=1, crumbly=1}
-                        {bendy=2, snappy=1},
-                        {hard=1, metal=1, spikes=1}
-    inventory_image = "default_tool_steelaxe.png",
-    wield_image = "",
-    wield_scale = {x=1,y=1,z=1},
-    stack_max = 99,
-    range = 4.0,
-    liquids_pointable = false,
-    tool_capabilities = {
-        full_punch_interval = 1.0,
-        max_drop_level=0,
-        groupcaps={
-            -- For example:
-            snappy={times={[2]=0.80, [3]=0.40}, maxwear=0.05, maxlevel=1},
-            choppy={times={[3]=0.90}, maxwear=0.05, maxlevel=0}
-        },
-        damage_groups = {groupname=damage},
+### Object Properties
+
+    {
+        hp_max = 1,
+        physical = true,
+        collide_with_objects = true, -- collide with other objects if physical=true
+        weight = 5,
+        collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
+        visual = "cube"/"sprite"/"upright_sprite"/"mesh"/"wielditem",
+        visual_size = {x=1, y=1},
+        mesh = "model",
+        textures = {}, -- number of required textures depends on visual
+        colors = {}, -- number of required colors depends on visual
+        spritediv = {x=1, y=1},
+        initial_sprite_basepos = {x=0, y=0},
+        is_visible = true,
+        makes_footstep_sound = false,
+        automatic_rotate = false,
+        stepheight = 0,
+        automatic_face_movement_dir = 0.0,
+    --  ^ automatically set yaw to movement direction; offset in degrees; false to disable
     }
-    node_placement_prediction = nil,
-    ^ If nil and item is node, prediction is made automatically
-    ^ If nil and item is not a node, no prediction is made
-    ^ If "" and item is anything, no prediction is made
-    ^ Otherwise should be name of node which the client immediately places
-      on ground when the player places the item. Server will always update
-      actual result to client in a short moment.
-    sound = {
-        place = <SimpleSoundSpec>,
+
+### Entity definition (`register_entity`)
+
+    {
+    --  Deprecated: Everything in object properties is read directly from here
+
+        initial_properties = --[[<initial object properties>]],
+
+        on_activate = function(self, staticdata, dtime_s),
+        on_step = function(self, dtime),
+        on_punch = function(self, hitter),
+        on_rightclick = function(self, clicker),
+        get_staticdata = function(self),
+    --  ^ Called sometimes; the string returned is passed to on_activate when
+    --    the entity is re-activated from static state
+
+        -- Also you can define arbitrary member variables here
+        myvariable = whatever,
     }
 
-    on_place = func(itemstack, placer, pointed_thing),
-    ^ Shall place item and return the leftover itemstack
-    ^ default: minetest.item_place
-    on_drop = func(itemstack, dropper, pos),
-    ^ Shall drop item and return the leftover itemstack
-    ^ default: minetest.item_drop
-    on_use = func(itemstack, user, pointed_thing),
-    ^  default: nil
-    ^ Function must return either nil if no item shall be removed from
-      inventory, or an itemstack to replace the original itemstack.
-        e.g. itemstack:take_item(); return itemstack
-    ^ Otherwise, the function is free to do what it wants.
-    ^ The default functions handle regular use cases.
-    after_use = func(itemstack, user, node, digparams),
-    ^  default: nil
-    ^ If defined, should return an itemstack and will be called instead of
-      wearing out the tool. If returns nil, does nothing.
-      If after_use doesn't exist, it is the same as:
-        function(itemstack, user, node, digparams)
-          itemstack:add_wear(digparams.wear)
-          return itemstack
-        end
-}
-
-Tile definition:
-- "image.png"
-- {name="image.png", animation={Tile Animation definition}}
-- {name="image.png", backface_culling=bool}
-  ^ backface culling only supported in special tiles
-- deprecated still supported field names:
-  - image -> name
-
-Tile animation definition:
-- {type="vertical_frames", aspect_w=16, aspect_h=16, length=3.0}
-
-Node definition (register_node)
-{
-    <all fields allowed in item definitions>,
-
-    drawtype = "normal", -- See "Node drawtypes"
-    visual_scale = 1.0,
-    ^ Supported for drawtypes "plantlike", "signlike", "torchlike", "mesh".
-    ^ For plantlike, the image will start at the bottom of the node; for the
-    ^ other drawtypes, the image will be centered on the node.
-    ^ Note that positioning for "torchlike" may still change.
-    tiles = {tile definition 1, def2, def3, def4, def5, def6},
-    ^ Textures of node; +Y, -Y, +X, -X, +Z, -Z (old field name: tile_images)
-    ^ List can be shortened to needed length
-    special_tiles = {tile definition 1, Tile definition 2},
-    ^ Special textures of node; used rarely (old field name: special_materials)
-    ^ List can be shortened to needed length
-    alpha = 255,
-    use_texture_alpha = false, -- Use texture's alpha channel
-    post_effect_color = {a=0, r=0, g=0, b=0}, -- If player is inside node
-    paramtype = "none", -- See "Nodes"
-    paramtype2 = "none", -- See "Nodes"
-    is_ground_content = true, -- If false, the cave generator will not carve through this
-    sunlight_propagates = false, -- If true, sunlight will go infinitely through this
-    walkable = true, -- If true, objects collide with node
-    pointable = true, -- If true, can be pointed at
-    diggable = true, -- If false, can never be dug
-    climbable = false, -- If true, can be climbed on (ladder)
-    buildable_to = false, -- If true, placed nodes can replace this node
-    liquidtype = "none", -- "none"/"source"/"flowing"
-    liquid_alternative_flowing = "", -- Flowing version of source liquid
-    liquid_alternative_source = "", -- Source version of flowing liquid
-    liquid_viscosity = 0, -- Higher viscosity = slower flow (max. 7)
-    liquid_renewable = true, -- Can new liquid source be created by placing two or more sources nearby?
-    freezemelt = "", -- water for snow/ice, ice/snow for water
-    leveled = 0, -- Block contain level in param2. value - default level, used for snow. Don't forget use "leveled" type nodebox
-    liquid_range = 8, -- number of flowing nodes around source (max. 8)
-    drowning = 0, -- Player will take this amount of damage if no bubbles are left
-    light_source = 0, -- Amount of light emitted by node
-    damage_per_second = 0, -- If player is inside node, this damage is caused
-    node_box = {type="regular"}, -- See "Node boxes"
-    mesh = "model",
-    selection_box = {type="regular"}, -- See "Node boxes"
-    ^ If drawtype "nodebox" is used and selection_box is nil, then node_box is used
-    legacy_facedir_simple = false, -- Support maps made in and before January 2012
-    legacy_wallmounted = false, -- Support maps made in and before January 2012
-    sounds = {
-        footstep = <SimpleSoundSpec>,
-        dig = <SimpleSoundSpec>, -- "__group" = group-based sound (default)
-        dug = <SimpleSoundSpec>,
-        place = <SimpleSoundSpec>,
-    },
-    drop = "",  -- Name of dropped node when dug. Default is the node itself.
-    -- Alternatively:
-    drop = {
-        max_items = 1,  -- Maximum number of items to drop.
-        items = { -- Choose max_items randomly from this list.
-            {
-                items = {"foo:bar", "baz:frob"},  -- Choose one item randomly from this list.
-                rarity = 1,  -- Probability of getting is 1 / rarity.
+### ABM (ActiveBlockModifier) definition (`register_abm`)
+
+    {
+    --  In the following two fields, also group:groupname will work.
+        nodenames = {"default:lava_source"},
+        neighbors = {"default:water_source", "default:water_flowing"}, -- (any of these)
+    --  ^ If left out or empty, any neighbor will do
+        interval = 1.0, -- (operation interval)
+        chance = 1, -- (chance of trigger is 1.0/this)
+        action = func(pos, node, active_object_count, active_object_count_wider),
+    }
+
+### Item definition (`register_node`, `register_craftitem`, `register_tool`)
+
+    {
+        description = "Steel Axe",
+        groups = {}, -- key=name, value=rating; rating=1..3.
+                        if rating not applicable, use 1.
+                        e.g. {wool=1, fluffy=3}
+                            {soil=2, outerspace=1, crumbly=1}
+                            {bendy=2, snappy=1},
+                            {hard=1, metal=1, spikes=1}
+        inventory_image = "default_tool_steelaxe.png",
+        wield_image = "",
+        wield_scale = {x=1,y=1,z=1},
+        stack_max = 99,
+        range = 4.0,
+        liquids_pointable = false,
+        tool_capabilities = {
+            full_punch_interval = 1.0,
+            max_drop_level=0,
+            groupcaps={
+                -- For example:
+                snappy={times={[2]=0.80, [3]=0.40}, maxwear=0.05, maxlevel=1},
+                choppy={times={[3]=0.90}, maxwear=0.05, maxlevel=0}
             },
+            damage_groups = {groupname=damage},
+        },
+        node_placement_prediction = nil,
+        --[[
+        ^ If nil and item is node, prediction is made automatically
+        ^ If nil and item is not a node, no prediction is made
+        ^ If "" and item is anything, no prediction is made
+        ^ Otherwise should be name of node which the client immediately places
+          on ground when the player places the item. Server will always update
+          actual result to client in a short moment.
+        ]]
+        sound = {
+            place = --[[<SimpleSoundSpec>]],
         },
-    },
 
-    on_construct = func(pos),
-    ^ Node constructor; always called after adding node
-    ^ Can set up metadata and stuff like that
-    ^ default: nil
-    on_destruct = func(pos),
-    ^ Node destructor; always called before removing node
-    ^ default: nil
-    after_destruct = func(pos, oldnode),
-    ^ Node destructor; always called after removing node
-    ^ default: nil
-
-    after_place_node = func(pos, placer, itemstack, pointed_thing)
-    ^ Called after constructing node when node was placed using
-      minetest.item_place_node / minetest.place_node
-    ^ If return true no item is taken from itemstack
-    ^ default: nil
-    after_dig_node = func(pos, oldnode, oldmetadata, digger),
-    ^ oldmetadata is in table format
-    ^ Called after destructing node when node was dug using
-      minetest.node_dig / minetest.dig_node
-    ^ default: nil
-    can_dig = function(pos,player)
-    ^ returns true if node can be dug, or false if not
-    ^ default: nil
-
-    on_punch = func(pos, node, puncher, pointed_thing),
-    ^ default: minetest.node_punch
-    ^ By default: Calls minetest.register_on_punchnode callbacks
-    on_rightclick = func(pos, node, clicker, itemstack, pointed_thing),
-    ^ default: nil
-    ^ if defined, itemstack will hold clicker's wielded item
-    ^ Shall return the leftover itemstack
-    ^ Note: pointed_thing can be nil, if a mod calls this function
-
-    on_dig = func(pos, node, digger),
-    ^ default: minetest.node_dig
-    ^ By default: checks privileges, wears out tool and removes node
-
-    on_timer = function(pos,elapsed),
-    ^ default: nil
-    ^ called by NodeTimers, see minetest.get_node_timer and NodeTimerRef
-    ^ elapsed is the total time passed since the timer was started
-    ^ return true to run the timer for another cycle with the same timeout value
-
-    on_receive_fields = func(pos, formname, fields, sender),
-    ^ fields = {name1 = value1, name2 = value2, ...}
-    ^ Called when an UI form (e.g. sign text input) returns data
-    ^ default: nil
-
-    allow_metadata_inventory_move = func(pos, from_list, from_index,
-            to_list, to_index, count, player),
-    ^ Called when a player wants to move items inside the inventory
-    ^ Return value: number of items allowed to move
-
-    allow_metadata_inventory_put = func(pos, listname, index, stack, player),
-    ^ Called when a player wants to put something into the inventory
-    ^ Return value: number of items allowed to put
-    ^ Return value: -1: Allow and don't modify item count in inventory
-
-    allow_metadata_inventory_take = func(pos, listname, index, stack, player),
-    ^ Called when a player wants to take something out of the inventory
-    ^ Return value: number of items allowed to take
-    ^ Return value: -1: Allow and don't modify item count in inventory
-
-    on_metadata_inventory_move = func(pos, from_list, from_index,
-            to_list, to_index, count, player),
-    on_metadata_inventory_put = func(pos, listname, index, stack, player),
-    on_metadata_inventory_take = func(pos, listname, index, stack, player),
-    ^ Called after the actual action has happened, according to what was allowed.
-    ^ No return value
-
-    on_blast = func(pos, intensity),
-    ^ intensity: 1.0 = mid range of regular TNT
-    ^ If defined, called when an explosion touches the node, instead of
-      removing the node
-}
-
-Recipe for register_craft: (shaped)
-{
-    output = 'default:pick_stone',
-    recipe = {
-        {'default:cobble', 'default:cobble', 'default:cobble'},
-        {'', 'default:stick', ''},
-        {'', 'default:stick', ''}, -- Also groups; e.g. 'group:crumbly'
-    },
-    replacements = <optional list of item pairs,
-                    replace one input item with another item on crafting>
-}
-
-Recipe for register_craft (shapeless)
-{
-    type = "shapeless",
-    output = 'mushrooms:mushroom_stew',
-    recipe = {
-        "mushrooms:bowl",
-        "mushrooms:mushroom_brown",
-        "mushrooms:mushroom_red",
-    },
-    replacements = <optional list of item pairs,
-                    replace one input item with another item on crafting>
-}
-
-Recipe for register_craft (tool repair)
-{
-    type = "toolrepair",
-    additional_wear = -0.02,
-}
-
-Recipe for register_craft (cooking)
-{
-    type = "cooking",
-    output = "default:glass",
-    recipe = "default:sand",
-    cooktime = 3,
-}
-
-Recipe for register_craft (furnace fuel)
-{
-    type = "fuel",
-    recipe = "default:leaves",
-    burntime = 1,
-}
-
-Ore definition (register_ore)
-{
-    ore_type = "scatter", -- See "Ore types"
-    ore = "default:stone_with_coal",
-    wherein = "default:stone",
-    ^ a list of nodenames is supported too
-    clust_scarcity = 8*8*8,
-    ^ Ore has a 1 out of clust_scarcity chance of spawning in a node
-    ^ This value should be *MUCH* higher than your intuition might tell you!
-    clust_num_ores = 8,
-    ^ Number of ores in a cluster
-    clust_size = 3,
-    ^ Size of the bounding box of the cluster
-    ^ In this example, there is a 3x3x3 cluster where 8 out of the 27 nodes are coal ore
-    height_min = -31000,
-    height_max = 64,
-    flags = "",
-    ^ Attributes for this ore generation
-    noise_threshhold = 0.5,
-    ^ If noise is above this threshold, ore is placed.  Not needed for a uniform distribution
-    noise_params = {offset=0, scale=1, spread={x=100, y=100, z=100}, seed=23, octaves=3, persist=0.70}
-    ^ NoiseParams structure describing the perlin noise used for ore distribution.
-    ^ Needed for sheet ore_type.  Omit from scatter ore_type for a uniform ore distribution
-    random_factor = 1.0,
-    ^ Multiplier of the randomness contribution to the noise value at any given point to
-    ^ decide if ore should be placed.  Set to 0 for solid veins. This parameter is only valid
-    ^ for ore_type == "vein".
-}
-
-Decoration definition (register_decoration)
-{
-    deco_type = "simple", -- See "Decoration types"
-    place_on = "default:dirt_with_grass",
-    ^ Node that decoration can be placed on
-    sidelen = 8,
-    ^ Size of divisions made in the chunk being generated.
-    ^ If the chunk size is not evenly divisible by sidelen, sidelen is made equal to the chunk size.
-    fill_ratio = 0.02,
-    ^ Ratio of the area to be uniformly filled by the decoration.
-    ^ Used only if noise_params is not specified.
-    noise_params = {offset=0, scale=.45, spread={x=100, y=100, z=100}, seed=354, octaves=3, persist=0.7},
-    ^ NoiseParams structure describing the perlin noise used for decoration distribution.
-    ^ The result of this is multiplied by the 2d area of the division being decorated.
-    biomes = {"Oceanside", "Hills", "Plains"},
-    ^ List of biomes in which this decoration occurs.  Occurs in all biomes if this is omitted,
-    ^ and ignored if the Mapgen being used does not support biomes.
-    height_min = -31000
-    height_max = 31000
-    ^ Minimum and maximum y positions these decorations can be generated at.  This parameter refers to the
-    ^ y position of the decoration base, so the actual maximum height would be (height_max + size.Y).
-
-    ----- Simple-type parameters
-    decoration = "default:grass",
-    ^ The node name used as the decoration.
-    ^ If instead a list of strings, a randomly selected node from the list is placed as the decoration.
-    height = 1,
-    ^ Number of nodes high the decoration is made.
-    ^ If height_max is not 0, this is the lower bound of the randomly selected height.
-    height_max = 0,
-    ^ Number of nodes the decoration can be at maximum.
-    ^ If absent, the parameter 'height' is used as a constant.
-    spawn_by = "default:water",
-    ^ Node that the decoration only spawns next to, in a 1-node square radius.
-    num_spawn_by = 1,
-    ^ Number of spawn_by nodes that must be surrounding the decoration position to occur.
-    ^ If absent or -1, decorations occur next to any nodes.
-
-    ----- Schematic-type parameters
-    schematic = "foobar.mts",
-    ^ If schematic is a string, it is the filepath relative to the current working directory of the
-    ^ specified Minetest schematic file.
-    ^  - OR -, could instead be a table containing two mandatory fields, size and data,
-    ^ and an optional table yslice_prob:
-    schematic = {
-        size = {x=4, y=6, z=4},
-        data = {
-            {name="cobble", param1=255, param2=0},
-            {name="dirt_with_grass", param1=255, param2=0},
-             ...
+        on_place = func(itemstack, placer, pointed_thing),
+        --[[
+        ^ Shall place item and return the leftover itemstack
+        ^ default: minetest.item_place ]]
+        on_drop = func(itemstack, dropper, pos),
+        --[[
+        ^ Shall drop item and return the leftover itemstack
+        ^ default: minetest.item_drop ]]
+        on_use = func(itemstack, user, pointed_thing),
+        --[[
+        ^  default: nil
+        ^ Function must return either nil if no item shall be removed from
+          inventory, or an itemstack to replace the original itemstack.
+            e.g. itemstack:take_item(); return itemstack
+        ^ Otherwise, the function is free to do what it wants.
+        ^ The default functions handle regular use cases.
+        ]]
+        after_use = func(itemstack, user, node, digparams),
+        --[[
+        ^  default: nil
+        ^ If defined, should return an itemstack and will be called instead of
+          wearing out the tool. If returns nil, does nothing.
+          If after_use doesn't exist, it is the same as:
+            function(itemstack, user, node, digparams)
+              itemstack:add_wear(digparams.wear)
+              return itemstack
+            end
+        ]]
+    }
+
+### Tile definition
+* `"image.png"`
+* `{name="image.png", animation={Tile Animation definition}}`
+* `{name="image.png", backface_culling=bool}`
+    * backface culling only supported in special tiles
+* deprecated, yet still supported field names:
+    * `image` (name)
+
+### Tile animation definition
+* `{type="vertical_frames", aspect_w=16, aspect_h=16, length=3.0}`
+
+### Node definition (`register_node`)
+
+    {
+        -- <all fields allowed in item definitions>,
+
+        drawtype = "normal", -- See "Node drawtypes"
+        visual_scale = 1.0, --[[
+        ^ Supported for drawtypes "plantlike", "signlike", "torchlike", "mesh".
+        ^ For plantlike, the image will start at the bottom of the node; for the
+        ^ other drawtypes, the image will be centered on the node.
+        ^ Note that positioning for "torchlike" may still change. ]]
+        tiles = {tile definition 1, def2, def3, def4, def5, def6}, --[[
+        ^ Textures of node; +Y, -Y, +X, -X, +Z, -Z (old field name: tile_images)
+        ^ List can be shortened to needed length ]]
+        special_tiles = {tile definition 1, Tile definition 2}, --[[
+        ^ Special textures of node; used rarely (old field name: special_materials)
+        ^ List can be shortened to needed length ]]
+        alpha = 255,
+        use_texture_alpha = false, -- Use texture's alpha channel
+        post_effect_color = {a=0, r=0, g=0, b=0}, -- If player is inside node
+        paramtype = "none", -- See "Nodes"
+        paramtype2 = "none", -- See "Nodes"
+        is_ground_content = true, -- If false, the cave generator will not carve through this
+        sunlight_propagates = false, -- If true, sunlight will go infinitely through this
+        walkable = true, -- If true, objects collide with node
+        pointable = true, -- If true, can be pointed at
+        diggable = true, -- If false, can never be dug
+        climbable = false, -- If true, can be climbed on (ladder)
+        buildable_to = false, -- If true, placed nodes can replace this node
+        liquidtype = "none", -- "none"/"source"/"flowing"
+        liquid_alternative_flowing = "", -- Flowing version of source liquid
+        liquid_alternative_source = "", -- Source version of flowing liquid
+        liquid_viscosity = 0, -- Higher viscosity = slower flow (max. 7)
+        liquid_renewable = true, -- Can new liquid source be created by placing two or more sources nearby?
+        freezemelt = "", -- water for snow/ice, ice/snow for water
+        leveled = 0, -- Block contain level in param2. value - default level, used for snow. Don't forget use "leveled" type nodebox
+        liquid_range = 8, -- number of flowing nodes around source (max. 8)
+        drowning = 0, -- Player will take this amount of damage if no bubbles are left
+        light_source = 0, -- Amount of light emitted by node
+        damage_per_second = 0, -- If player is inside node, this damage is caused
+        node_box = {type="regular"}, -- See "Node boxes"
+        mesh = "model",
+        selection_box = {type="regular"}, -- See "Node boxes"
+        ^ If drawtype "nodebox" is used and selection_box is nil, then node_box is used
+        legacy_facedir_simple = false, -- Support maps made in and before January 2012
+        legacy_wallmounted = false, -- Support maps made in and before January 2012
+        sounds = {
+            footstep = <SimpleSoundSpec>,
+            dig = <SimpleSoundSpec>, -- "__group" = group-based sound (default)
+            dug = <SimpleSoundSpec>,
+            place = <SimpleSoundSpec>,
         },
-        yslice_prob = {
-            {ypos=2, prob=128},
-            {ypos=5, prob=64},
-             ...
+        drop = "",  -- Name of dropped node when dug. Default is the node itself.
+        -- Alternatively:
+        drop = {
+            max_items = 1,  -- Maximum number of items to drop.
+            items = { -- Choose max_items randomly from this list.
+                {
+                    items = {"foo:bar", "baz:frob"},  -- Choose one item randomly from this list.
+                    rarity = 1,  -- Probability of getting is 1 / rarity.
+                },
+            },
         },
-    },
-    ^ See 'Schematic specifier' for details.
-    replacements = {["oldname"] = "convert_to", ...},
-    flags = "place_center_x, place_center_z",
-    ^ Flags for schematic decorations.  See 'Schematic attributes'.
-    rotation = "90" -- rotate schematic 90 degrees on placement
-    ^ Rotation can be "0", "90", "180", "270", or "random".
-}
-
-Chatcommand definition (register_chatcommand)
-{
-    params = "<name> <privilege>", -- Short parameter description
-    description = "Remove privilege from player", -- Full description
-    privs = {privs=true}, -- Require the "privs" privilege to run
-    func = function(name, param), -- Called when command is run.
-                                  -- Returns boolean success and text output.
-}
-
-Detached inventory callbacks
-{
-    allow_move = func(inv, from_list, from_index, to_list, to_index, count, player),
-    ^ Called when a player wants to move items inside the inventory
-    ^ Return value: number of items allowed to move
-
-    allow_put = func(inv, listname, index, stack, player),
-    ^ Called when a player wants to put something into the inventory
-    ^ Return value: number of items allowed to put
-    ^ Return value: -1: Allow and don't modify item count in inventory
-
-    allow_take = func(inv, listname, index, stack, player),
-    ^ Called when a player wants to take something out of the inventory
-    ^ Return value: number of items allowed to take
-    ^ Return value: -1: Allow and don't modify item count in inventory
-
-    on_move = func(inv, from_list, from_index, to_list, to_index, count, player),
-    on_put = func(inv, listname, index, stack, player),
-    on_take = func(inv, listname, index, stack, player),
-    ^ Called after the actual action has happened, according to what was allowed.
-    ^ No return value
-}
-
-HUD Definition (hud_add, hud_get)
-{
-    hud_elem_type = "image", -- see HUD element types
-    ^ type of HUD element, can be either of "image", "text", "statbar", or "inventory"
-    position = {x=0.5, y=0.5},
-    ^ Left corner position of element
-    name = "<name>",
-    scale = {x=2, y=2},
-    text = "<text>",
-    number = 2,
-    item = 3,
-    ^ Selected item in inventory.  0 for no item selected.
-    direction = 0,
-    ^ Direction: 0: left-right, 1: right-left, 2: top-bottom, 3: bottom-top
-    alignment = {x=0, y=0},
-    ^ See "HUD Element Types"
-    offset = {x=0, y=0},
-    ^ See "HUD Element Types"
-    size = { x=100, y=100 },
-    ^ Size of element in pixels
-}
-
-Particle definition (add_particle)
-{
-    pos = {x=0, y=0, z=0},
-    velocity = {x=0, y=0, z=0},
-    acceleration = {x=0, y=0, z=0},
-    ^ Spawn particle at pos with velocity and acceleration
-    expirationtime = 1,
-    ^ Disappears after expirationtime seconds
-    size = 1,
-    collisiondetection = false,
-    ^ collisiondetection: if true collides with physical objects
-    vertical = false,
-    ^ vertical: if true faces player using y axis only
-    texture = "image.png",
-    ^ Uses texture (string)
-    playername = "singleplayer"
-    ^ optional, if specified spawns particle only on the player's client
-}
-
-ParticleSpawner definition (add_particlespawner)
-{
-    amount = 1,
-    time = 1,
-    ^ If time is 0 has infinite lifespan and spawns the amount on a per-second base
-    minpos = {x=0, y=0, z=0},
-    maxpos = {x=0, y=0, z=0},
-    minvel = {x=0, y=0, z=0},
-    maxvel = {x=0, y=0, z=0},
-    minacc = {x=0, y=0, z=0},
-    maxacc = {x=0, y=0, z=0},
-    minexptime = 1,
-    maxexptime = 1,
-    minsize = 1,
-    maxsize = 1,
-    ^ The particle's properties are random values in between the bounds:
-    ^ minpos/maxpos, minvel/maxvel (velocity), minacc/maxacc (acceleration),
-    ^ minsize/maxsize, minexptime/maxexptime (expirationtime)
-    collisiondetection = false,
-    ^ collisiondetection: if true uses collision detection
-    vertical = false,
-    ^ vertical: if true faces player using y axis only
-    texture = "image.png",
-    ^ Uses texture (string)
-    playername = "singleplayer"
-    ^ Playername is optional, if specified spawns particle only on the player's client
-}
+
+        on_construct = func(pos), --[[
+        ^ Node constructor; always called after adding node
+        ^ Can set up metadata and stuff like that
+        ^ default: nil ]]
+        on_destruct = func(pos), --[[
+        ^ Node destructor; always called before removing node
+        ^ default: nil ]]
+        after_destruct = func(pos, oldnode), --[[
+        ^ Node destructor; always called after removing node
+        ^ default: nil ]]
+
+        after_place_node = func(pos, placer, itemstack, pointed_thing) --[[
+        ^ Called after constructing node when node was placed using
+          minetest.item_place_node / minetest.place_node
+        ^ If return true no item is taken from itemstack
+        ^ default: nil ]]
+        after_dig_node = func(pos, oldnode, oldmetadata, digger), --[[
+        ^ oldmetadata is in table format
+        ^ Called after destructing node when node was dug using
+          minetest.node_dig / minetest.dig_node
+        ^ default: nil ]]
+        can_dig = function(pos,player) --[[
+        ^ returns true if node can be dug, or false if not
+        ^ default: nil ]]
+
+        on_punch = func(pos, node, puncher, pointed_thing), --[[
+        ^ default: minetest.node_punch
+        ^ By default: Calls minetest.register_on_punchnode callbacks ]]
+        on_rightclick = func(pos, node, clicker, itemstack, pointed_thing), --[[
+        ^ default: nil
+        ^ if defined, itemstack will hold clicker's wielded item
+        ^ Shall return the leftover itemstack
+        ^ Note: pointed_thing can be nil, if a mod calls this function ]]
+
+        on_dig = func(pos, node, digger), --[[
+        ^ default: minetest.node_dig
+        ^ By default: checks privileges, wears out tool and removes node ]]
+
+        on_timer = function(pos,elapsed), --[[
+        ^ default: nil
+        ^ called by NodeTimers, see minetest.get_node_timer and NodeTimerRef
+        ^ elapsed is the total time passed since the timer was started
+        ^ return true to run the timer for another cycle with the same timeout value ]]
+
+        on_receive_fields = func(pos, formname, fields, sender), --[[
+        ^ fields = {name1 = value1, name2 = value2, ...}
+        ^ Called when an UI form (e.g. sign text input) returns data
+        ^ default: nil ]]
+
+        allow_metadata_inventory_move = func(pos, from_list, from_index,
+                to_list, to_index, count, player), --[[
+        ^ Called when a player wants to move items inside the inventory
+        ^ Return value: number of items allowed to move ]]
+
+        allow_metadata_inventory_put = func(pos, listname, index, stack, player), --[[
+        ^ Called when a player wants to put something into the inventory
+        ^ Return value: number of items allowed to put
+        ^ Return value: -1: Allow and don't modify item count in inventory ]]
+
+        allow_metadata_inventory_take = func(pos, listname, index, stack, player), --[[
+        ^ Called when a player wants to take something out of the inventory
+        ^ Return value: number of items allowed to take
+        ^ Return value: -1: Allow and don't modify item count in inventory ]]
+
+        on_metadata_inventory_move = func(pos, from_list, from_index,
+                to_list, to_index, count, player),
+        on_metadata_inventory_put = func(pos, listname, index, stack, player),
+        on_metadata_inventory_take = func(pos, listname, index, stack, player), --[[
+        ^ Called after the actual action has happened, according to what was allowed.
+        ^ No return value ]]
+
+        on_blast = func(pos, intensity), --[[
+        ^ intensity: 1.0 = mid range of regular TNT
+        ^ If defined, called when an explosion touches the node, instead of
+          removing the node ]]
+    }
+
+### Recipe for `register_craft` (shaped)
+
+    {
+        output = 'default:pick_stone',
+        recipe = {
+            {'default:cobble', 'default:cobble', 'default:cobble'},
+            {'', 'default:stick', ''},
+            {'', 'default:stick', ''}, -- Also groups; e.g. 'group:crumbly'
+        },
+        replacements = --[[<optional list of item pairs,
+                        replace one input item with another item on crafting>]]
+    }
+
+### Recipe for `register_craft` (shapeless)
+
+    {
+       type = "shapeless",
+       output = 'mushrooms:mushroom_stew',
+       recipe = {
+           "mushrooms:bowl",
+           "mushrooms:mushroom_brown",
+           "mushrooms:mushroom_red",
+       },
+       replacements = --[[<optional list of item pairs,
+                       replace one input item with another item on crafting>]]
+   }
+
+### Recipe for `register_craft` (tool repair)
+
+    {
+        type = "toolrepair",
+        additional_wear = -0.02,
+    }
+
+### Recipe for `register_craft` (cooking)
+
+    {
+        type = "cooking",
+        output = "default:glass",
+        recipe = "default:sand",
+        cooktime = 3,
+    }
+
+### Recipe for `register_craft` (furnace fuel)
+
+    {
+        type = "fuel",
+        recipe = "default:leaves",
+        burntime = 1,
+    }
+
+### Ore definition (`register_ore`)
+
+    {
+        ore_type = "scatter", -- See "Ore types"
+        ore = "default:stone_with_coal",
+        wherein = "default:stone",
+    --  ^ a list of nodenames is supported too
+        clust_scarcity = 8*8*8,
+    --  ^ Ore has a 1 out of clust_scarcity chance of spawning in a node
+    --  ^ This value should be *MUCH* higher than your intuition might tell you!
+        clust_num_ores = 8,
+    --  ^ Number of ores in a cluster
+        clust_size = 3,
+    --  ^ Size of the bounding box of the cluster
+    --  ^ In this example, there is a 3x3x3 cluster where 8 out of the 27 nodes are coal ore
+        height_min = -31000,
+        height_max = 64,
+        flags = "",
+    --  ^ Attributes for this ore generation
+        noise_threshhold = 0.5,
+    --  ^ If noise is above this threshold, ore is placed.  Not needed for a uniform distribution
+        noise_params = {offset=0, scale=1, spread={x=100, y=100, z=100}, seed=23, octaves=3, persist=0.70}
+    --  ^ NoiseParams structure describing the perlin noise used for ore distribution.
+    --  ^ Needed for sheet ore_type.  Omit from scatter ore_type for a uniform ore distribution
+        random_factor = 1.0,
+    --  ^ Multiplier of the randomness contribution to the noise value at any
+    --   given point to decide if ore should be placed.  Set to 0 for solid veins.
+    --  ^ This parameter is only valid for ore_type == "vein".
+    }
+
+### Decoration definition (`register_decoration`)
+
+    {
+        deco_type = "simple", -- See "Decoration types"
+        place_on = "default:dirt_with_grass",
+    --  ^ Node that decoration can be placed on
+        sidelen = 8,
+    --  ^ Size of divisions made in the chunk being generated.
+    --  ^ If the chunk size is not evenly divisible by sidelen, sidelen is made equal to the chunk size.
+        fill_ratio = 0.02,
+    --  ^ Ratio of the area to be uniformly filled by the decoration.
+    --  ^ Used only if noise_params is not specified.
+        noise_params = {offset=0, scale=.45, spread={x=100, y=100, z=100}, seed=354, octaves=3, persist=0.7},
+    --  ^ NoiseParams structure describing the perlin noise used for decoration distribution.
+    --  ^ The result of this is multiplied by the 2d area of the division being decorated.
+        biomes = {"Oceanside", "Hills", "Plains"},
+    --  ^ List of biomes in which this decoration occurs.  Occurs in all biomes if this is omitted,
+    --  ^ and ignored if the Mapgen being used does not support biomes.
+        height_min = -31000
+        height_max = 31000
+    -- ^ Minimum and maximum `y` positions these decorations can be generated at.
+    -- ^ This parameter refers to the `y` position of the decoration base, so
+    --   the actual maximum height would be `height_max + size.Y`.
+
+        ----- Simple-type parameters
+        decoration = "default:grass",
+    --  ^ The node name used as the decoration.
+    --  ^ If instead a list of strings, a randomly selected node from the list is placed as the decoration.
+        height = 1,
+    --  ^ Number of nodes high the decoration is made.
+    --  ^ If height_max is not 0, this is the lower bound of the randomly selected height.
+        height_max = 0,
+    --      ^ Number of nodes the decoration can be at maximum.
+    --  ^ If absent, the parameter 'height' is used as a constant.
+        spawn_by = "default:water",
+    --  ^ Node that the decoration only spawns next to, in a 1-node square radius.
+        num_spawn_by = 1,
+    --  ^ Number of spawn_by nodes that must be surrounding the decoration position to occur.
+    --  ^ If absent or -1, decorations occur next to any nodes.
+
+        ----- Schematic-type parameters
+        schematic = "foobar.mts",
+    --  ^ If schematic is a string, it is the filepath relative to the current working directory of the
+    --  ^ specified Minetest schematic file.
+    --  ^  - OR -, could instead be a table containing two mandatory fields, size and data,
+    --  ^ and an optional table yslice_prob:
+        schematic = {
+            size = {x=4, y=6, z=4},
+            data = {
+                {name="cobble", param1=255, param2=0},
+                {name="dirt_with_grass", param1=255, param2=0},
+                 ...
+            },
+            yslice_prob = {
+                {ypos=2, prob=128},
+                {ypos=5, prob=64},
+                 ...
+            },
+        },
+    --  ^ See 'Schematic specifier' for details.
+        replacements = {["oldname"] = "convert_to", ...},
+        flags = "place_center_x, place_center_z",
+    --  ^ Flags for schematic decorations.  See 'Schematic attributes'.
+        rotation = "90" -- rotate schematic 90 degrees on placement
+    --  ^ Rotation can be "0", "90", "180", "270", or "random".
+    }
+
+### Chat command definition (`register_chatcommand`)
+
+    {
+        params = "<name> <privilege>", -- Short parameter description
+        description = "Remove privilege from player", -- Full description
+        privs = {privs=true}, -- Require the "privs" privilege to run
+        func = function(name, param), -- Called when command is run.
+                                      -- Returns boolean success and text output.
+    }
+
+### Detached inventory callbacks
+
+    {
+        allow_move = func(inv, from_list, from_index, to_list, to_index, count, player),
+    --  ^ Called when a player wants to move items inside the inventory
+    --  ^ Return value: number of items allowed to move
+
+        allow_put = func(inv, listname, index, stack, player),
+    --  ^ Called when a player wants to put something into the inventory
+    --  ^ Return value: number of items allowed to put
+    --  ^ Return value: -1: Allow and don't modify item count in inventory
+
+        allow_take = func(inv, listname, index, stack, player),
+    --  ^ Called when a player wants to take something out of the inventory
+    --  ^ Return value: number of items allowed to take
+    --  ^ Return value: -1: Allow and don't modify item count in inventory
+
+        on_move = func(inv, from_list, from_index, to_list, to_index, count, player),
+        on_put = func(inv, listname, index, stack, player),
+        on_take = func(inv, listname, index, stack, player),
+    --  ^ Called after the actual action has happened, according to what was allowed.
+    --  ^ No return value
+    }
+
+### HUD Definition (`hud_add`, `hud_get`)
+
+    {
+        hud_elem_type = "image", -- see HUD element types
+    --  ^ type of HUD element, can be either of "image", "text", "statbar", or "inventory"
+        position = {x=0.5, y=0.5},
+    --  ^ Left corner position of element
+        name = "<name>",
+        scale = {x=2, y=2},
+        text = "<text>",
+        number = 2,
+        item = 3,
+    --  ^ Selected item in inventory.  0 for no item selected.
+        direction = 0,
+    --  ^ Direction: 0: left-right, 1: right-left, 2: top-bottom, 3: bottom-top
+        alignment = {x=0, y=0},
+    --  ^ See "HUD Element Types"
+        offset = {x=0, y=0},
+    --  ^ See "HUD Element Types"
+        size = { x=100, y=100 },
+    --  ^ Size of element in pixels
+    }
+
+### Particle definition (`add_particle`)
+
+    {
+        pos = {x=0, y=0, z=0},
+        velocity = {x=0, y=0, z=0},
+        acceleration = {x=0, y=0, z=0},
+    --  ^ Spawn particle at pos with velocity and acceleration
+        expirationtime = 1,
+    --  ^ Disappears after expirationtime seconds
+        size = 1,
+        collisiondetection = false,
+    --  ^ collisiondetection: if true collides with physical objects
+        vertical = false,
+    --  ^ vertical: if true faces player using y axis only
+        texture = "image.png",
+    --  ^ Uses texture (string)
+        playername = "singleplayer"
+    --  ^ optional, if specified spawns particle only on the player's client
+    }
+
+### `ParticleSpawner` definition (`add_particlespawner`)
+
+    {
+        amount = 1,
+        time = 1,
+    --  ^ If time is 0 has infinite lifespan and spawns the amount on a per-second base
+        minpos = {x=0, y=0, z=0},
+        maxpos = {x=0, y=0, z=0},
+        minvel = {x=0, y=0, z=0},
+        maxvel = {x=0, y=0, z=0},
+        minacc = {x=0, y=0, z=0},
+        maxacc = {x=0, y=0, z=0},
+        minexptime = 1,
+        maxexptime = 1,
+        minsize = 1,
+        maxsize = 1,
+    --  ^ The particle's properties are random values in between the bounds:
+    --  ^ minpos/maxpos, minvel/maxvel (velocity), minacc/maxacc (acceleration),
+    --  ^ minsize/maxsize, minexptime/maxexptime (expirationtime)
+        collisiondetection = false,
+    --  ^ collisiondetection: if true uses collision detection
+        vertical = false,
+    --  ^ vertical: if true faces player using y axis only
+        texture = "image.png",
+    --  ^ Uses texture (string)
+        playername = "singleplayer"
+    --  ^ Playername is optional, if specified spawns particle only on the player's client
+    }