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diff --git a/doc/client_lua_api.txt b/doc/client_lua_api.txt new file mode 100644 index 000000000..8ce487bf8 --- /dev/null +++ b/doc/client_lua_api.txt @@ -0,0 +1,787 @@ +Minetest Lua Modding API Reference 0.4.15 +========================================= +* 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. + +A mod is a self-contained bunch of scripts, textures and other related +things that is loaded by and interfaces with Minetest. + +Mods are contained and ran solely on the server side. Definitions and media +files are automatically transferred to the client. + +If you see a deficiency in the API, feel free to attempt to add the +functionality in the engine and API. You can send such improvements as +source code patches on GitHub (https://github.com/minetest/minetest). + +Programming in Lua +------------------ +If you have any difficulty in understanding this, please read +[Programming in Lua](http://www.lua.org/pil/). + +Startup +------- +Mods are loaded during client startup from the mod load paths by running +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: `$HOME/.minetest` + * Windows: `C:/users/<user>/AppData/minetest` (maybe) + +Mod load path +------------- +Generic: + +* `$path_share/clientmods/` +* `$path_user/clientmods/` (User-installed mods) + +In a run-in-place version (e.g. the distributed windows version): + +* `minetest-0.4.x/clientmods/` (User-installed mods) + +On an installed version on Linux: + +* `/usr/share/minetest/clientmods/` +* `$HOME/.minetest/clientmods/` (User-installed 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. + +Mod directory structure +------------------------ + + mods + |-- modname + | |-- depends.txt + | |-- screenshot.png + | |-- description.txt + | |-- settingtypes.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 the mod manager within the main menu. It should +have an aspect ratio of 3:2 and a minimum size of 300×200 pixels. + +### `description.txt` +A File containing description to be shown within mainmenu. + +### `settingtypes.txt` +A file in the same format as the one in builtin. It will be parsed by the +settings menu and the settings will be displayed in the "Mods" category. + +### `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. + +### `sounds` +Media files (sounds) 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_) + +This is to prevent conflicting names from corrupting maps and is +enforced by the mod loader. + +### 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 +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) + +The `:` prefix can also be used for maintaining backwards compatibility. + +### Aliases +Aliases can be added by using `minetest.register_alias(name, convert_to)` or +`minetest.register_alias_force(name, convert_to). + +This will make Minetest to convert things called name to things called +`convert_to`. + +The only difference between `minetest.register_alias` and +`minetest.register_alias_force` is that if an item called `name` exists, +`minetest.register_alias` will do nothing while +`minetest.register_alias_force` will unregister it. + +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`. + +Sounds +------ +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 + +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 +is chosen randomly from the matching sounds. + +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` + +Examples of sound parameter tables: + + -- Play locationless on all clients + { + gain = 1.0, -- default + } + -- Play locationless to one player + { + to_player = name, + gain = 1.0, -- default + } + -- Play locationless to one player, looped + { + to_player = name, + gain = 1.0, -- default + loop = true, + } + -- Play in a location + { + pos = {x = 1, y = 2, z = 3}, + gain = 1.0, -- default + max_hear_distance = 32, -- default, uses an euclidean metric + } + -- Play connected to an object, looped + { + object = <an ObjectRef>, + gain = 1.0, -- default + max_hear_distance = 32, -- default, uses an euclidean metric + loop = true, + } + +Looped sounds must either be connected to an object or played locationless to +one player using `to_player = name,` + +### `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}` + +Representations of simple things +-------------------------------- + +### 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}` + +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 +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. + +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} + +which is equivalent to + + "place_center_x, noplace_center_y, place_center_z" + +or even + + "place_center_x, place_center_z" + +since, by default, no schematic attributes are set. + +Formspec +-------- +Formspec defines a menu. Currently not much else than inventories are +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 + + size[8,9] + list[context;main;0,0;8,4;] + list[current_player;main;0,5;8,4;] + +#### 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 + + 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>;]` + +#### `container[<X>,<Y>]` +* Start of a container block, moves all physical elements in the container by (X, Y) +* Must have matching container_end +* Containers can be nested, in which case the offsets are added + (child containers are relative to parent containers) + +#### `container_end[]` +* End of a container, following elements are no longer relative to this container + +#### `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 + +#### `listring[<inventory location>;<list name>]` +* Allows to create a ring of inventory lists +* Shift-clicking on items in one element of the ring + will send them to the next inventory list inside the ring +* The first occurrence of an element inside the ring will + determine the inventory where items will be sent to + +#### `listring[]` +* Shorthand for doing `listring[<inventory location>;<list name>]` + for the last two inventory lists added by 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 +* When enter is pressed in field, fields.key_enter_field will be sent with the name + of this field. +* `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 +* See field_close_on_enter to stop enter closing the formspec + +#### `field[<X>,<Y>;<W>,<H>;<name>;<label>;<default>]` +* Textual field; will be sent to server when a button is clicked +* When enter is pressed in field, fields.key_enter_field will be sent with the name + of this field. +* `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. +* See field_close_on_enter to stop enter closing the formspec + +#### `field[<name>;<label>;<default>]` +* As above, but without position/size units +* When enter is pressed in field, fields.key_enter_field will be sent with the name + of this field. +* 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 +* See field_close_on_enter to stop enter closing the formspec + +#### `field_close_on_enter[<name>;<close_on_enter>]` +* <name> is the name of the field +* if <close_on_enter> is false, pressing enter in the field will submit the form but not close it +* defaults to true when not specified (ie: no tag for a field) + +#### `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>]` +* 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` + +#### `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 + * `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 +pass key press events to formspec! + +Spatial Vectors +--------------- +* `vector.new(a[, b, c])`: returns a vector: + * A copy of `a` if `a` is a vector. + * `{x = a, y = b, z = c}`, if all `a, b, c` are defined +* `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.floor(v)`: returns a vector, each dimension rounded down +* `vector.round(v)`: returns a vector, each dimension rounded to nearest int +* `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 scaled vector or Schur product +* `vector.divide(v, x)`: returns a scaled vector or Schur quotient + +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()` + * e.g. `string.trim("\n \t\tfoo bar\t ") == "foo bar"` +* `minetest.is_yes(arg)` + * returns whether `arg` can be interpreted as yes +* `minetest.get_us_time()` + * returns time with microsecond precision. May not return wall time. +* `table.copy(table)`: returns a table + * returns a deep copy of `table` + +`minetest` namespace reference +------------------------------ + +### Utilities + +* `minetest.get_current_modname()`: returns the currently loading mod's name, when we are loading a mod +* `minetest.get_version()`: returns a table containing components of the + engine version. Components: + * `project`: Name of the project, eg, "Minetest" + * `string`: Simple version, eg, "1.2.3-dev" + * `hash`: Full git version (only set if available), eg, "1.2.3-dev-01234567-dirty" + Use this for informational purposes only. The information in the returned + table does not represent the capabilities of the engine, nor is it + reliable or verifyable. Compatible forks will have a different name and + version entirely. To check for the presence of engine features, test + whether the functions exported by the wanted features exist. For example: + `if core.nodeupdate then ... end`. + +### Logging +* `minetest.debug(...)` + * Equivalent to `minetest.log(table.concat({...}, "\t"))` +* `minetest.log([level,] text)` + * `level` is one of `"none"`, `"error"`, `"warning"`, `"action"`, + `"info"`, or `"verbose"`. Default is `"none"`. + +### Global callback registration functions +Call these functions only at load time! + +* `minetest.register_globalstep(func(dtime))` + * Called every client environment step, usually interval of 0.1s +* `minetest.register_on_shutdown(func())` + * Called before client shutdown + * **Warning**: If the client 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_receiving_chat_message(func(name, message))` + * Called always when a client receive a message + * Return `true` to mark the message as handled, which means that it will not be shown to chat +* `minetest.register_on_sending_chat_message(func(name, message))` + * Called always when a client send a message from chat + * Return `true` to mark the message as handled, which means that it will not be sent to server +* `minetest.register_chatcommand(cmd, chatcommand definition)` + * Adds definition to minetest.registered_chatcommands +* `minetest.register_on_death(func())` + * Called when player die +* `minetest.register_on_hp_modification(func(hp))` + * Called when server modified player's HP +* `minetest.register_on_damage_taken(func(hp))` + * Called when player take damages + +### 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, may be fractional + * Optional: Variable number of arguments that are passed to `func` + +### Misc. +* `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.encode_base64(string)`: returns string encoded in base64 + * Encodes a string in base64. +* `minetest.decode_base64(string)`: returns string + * Decodes a string encoded in base64. + +Class reference +--------------- + +### `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,...}` + +Definition tables +----------------- + +### 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. + } |