From 6456aba73f0ef3f2fa7fd2b2a69cfdf8624afe23 Mon Sep 17 00:00:00 2001
From: Wuzzy <wuzzy2@mail.ru>
Date: Sun, 24 May 2020 15:46:26 +0200
Subject: Replacement for Minimal Development Test (PR) (#9450)

---
 games/minimal/mods/testtools/README.md             |  99 +++
 games/minimal/mods/testtools/init.lua              | 691 +++++++++++++++++++++
 games/minimal/mods/testtools/mod.conf              |   2 +
 .../textures/testtools_entity_rotator.png          | Bin 0 -> 151 bytes
 .../testtools/textures/testtools_entity_scaler.png | Bin 0 -> 182 bytes
 .../textures/testtools_entity_spawner.png          | Bin 0 -> 189 bytes
 .../textures/testtools_falling_node_tool.png       | Bin 0 -> 140 bytes
 .../testtools/textures/testtools_node_setter.png   | Bin 0 -> 146 bytes
 .../textures/testtools_object_attacher.png         | Bin 0 -> 173 bytes
 .../testtools/textures/testtools_object_editor.png | Bin 0 -> 180 bytes
 .../testtools/textures/testtools_object_mover.png  | Bin 0 -> 175 bytes
 .../testtools/textures/testtools_param2tool.png    | Bin 0 -> 127 bytes
 .../mods/testtools/textures/testtools_remover.png  | Bin 0 -> 129 bytes
 13 files changed, 792 insertions(+)
 create mode 100644 games/minimal/mods/testtools/README.md
 create mode 100644 games/minimal/mods/testtools/init.lua
 create mode 100644 games/minimal/mods/testtools/mod.conf
 create mode 100644 games/minimal/mods/testtools/textures/testtools_entity_rotator.png
 create mode 100644 games/minimal/mods/testtools/textures/testtools_entity_scaler.png
 create mode 100644 games/minimal/mods/testtools/textures/testtools_entity_spawner.png
 create mode 100644 games/minimal/mods/testtools/textures/testtools_falling_node_tool.png
 create mode 100644 games/minimal/mods/testtools/textures/testtools_node_setter.png
 create mode 100644 games/minimal/mods/testtools/textures/testtools_object_attacher.png
 create mode 100644 games/minimal/mods/testtools/textures/testtools_object_editor.png
 create mode 100644 games/minimal/mods/testtools/textures/testtools_object_mover.png
 create mode 100644 games/minimal/mods/testtools/textures/testtools_param2tool.png
 create mode 100644 games/minimal/mods/testtools/textures/testtools_remover.png

(limited to 'games/minimal/mods/testtools')

diff --git a/games/minimal/mods/testtools/README.md b/games/minimal/mods/testtools/README.md
new file mode 100644
index 000000000..9cfe29ea4
--- /dev/null
+++ b/games/minimal/mods/testtools/README.md
@@ -0,0 +1,99 @@
+# Test Tools readme
+
+Test Tools is a mod for developers that adds a bunch of tools to directly manipulate nodes and entities. This is great for quickly testing out stuff.
+
+Here's the list of tools:
+
+## Remover
+Removes nodes and non-player entities that you punch.
+
+## Node Setter
+Replace a node with another one.
+
+First, punch a node you want to remember.
+Then rightclick any other node to replace it with the node you remembered.
+
+If you rightclick while pointing nothing, you can manually enter the node and param2.
+
+## Param2 Tool
+Change the value param2 of nodes.
+
+* Punch: Add 1 to param2
+* Sneak+Punch: Add 8 to param2
+* Place: Subtract 1 from param2
+* Sneak+Place: Subtract 8 from param2
+
+Note: Use the debug screen (F5) to see the param2 of the pointed node.
+
+## Falling Node Tool
+Turns nodes into falling nodes.
+
+Usage:
+
+* Punch node: Make it fall
+* Place: Try to teleport up to 2 units upwards, then make it fall
+
+## Entity Rotator
+Changes the entity rotation (with `set_rotation`).
+
+Usage:
+
+* Punch entity: Rotate yaw
+* Punch entity while holding down “Sneak” key: Rotate pitch
+* Punch entity while holding down “Special” key (aka “Aux”): Rotate roll
+
+Each usage rotates the entity by 22.5°.
+
+## Entity Spawner
+Spawns entities.
+
+Usage:
+
+* Punch to select entity or spawn one directly
+* Place to place selected entity
+
+## Object Property Editor
+Edits properties of objects.
+
+Usage:
+
+* Punch object to open a formspec that allows you to view and edit properties
+* Punch air to edit properties of your own player object
+
+To edit a property, select it in the list, enter a new value (in Lua syntax)
+and hit “Submit”.
+
+## Object Attacher
+Allows you to attach an object to another one.
+
+Basic usage:
+* First select the parent object, then the child object that should be attached
+* Selecting an object is done by punching it
+* Sneak+punch to detach selected object
+* If you punch air, you select yourself
+
+Configuration:
+* Place: Increase attachment Y position
+* Sneak+place: decrease attachment Y position
+* Aux+place: Increase attachment X rotation
+* Aux+Sneak+Rightclick: Decrease attachment X rotation
+
+Hint: To detach all objects nearby you (including on yourself), use the
+`/detach` server command.
+
+## Object Mover
+Move an object by a given distance.
+
+Usage:
+* Punch object into the direction you want to move it
+* Sneak+punch: Move object towards you
+* Place: Increase move distance
+* Sneak+place: Decrease move distance
+
+## Entity Visual Scaler
+Change visual size of entities
+
+Usage:
+
+* Punch entity to increase visual size
+* Sneak+punch entity to decrease visual size
diff --git a/games/minimal/mods/testtools/init.lua b/games/minimal/mods/testtools/init.lua
new file mode 100644
index 000000000..a63c98377
--- /dev/null
+++ b/games/minimal/mods/testtools/init.lua
@@ -0,0 +1,691 @@
+local S = minetest.get_translator("testtools")
+local F = minetest.formspec_escape
+
+-- TODO: Add a Node Metadata tool
+
+-- Param 2 Tool: Set param2 value of tools
+-- Punch: +1
+-- Punch+Shift:	+8
+-- Place: -1
+-- Place+Shift:	-8
+minetest.register_tool("testtools:param2tool", {
+	description = S("Param2 Tool"),
+	inventory_image = "testtools_param2tool.png",
+	groups = { testtool = 1, disable_repair = 1 },
+	on_use = function(itemstack, user, pointed_thing)
+		local pos = minetest.get_pointed_thing_position(pointed_thing)
+		if pointed_thing.type ~= "node" or (not pos) then
+			return
+		end
+		local add = 1
+		if user then
+			local ctrl = user:get_player_control()
+			if ctrl.sneak then
+				add = 8
+			end
+		end
+		local node = minetest.get_node(pos)
+		node.param2 = node.param2 + add
+		minetest.swap_node(pos, node)
+	end,
+	on_place = function(itemstack, user, pointed_thing)
+		local pos = minetest.get_pointed_thing_position(pointed_thing)
+		if pointed_thing.type ~= "node" or (not pos) then
+			return
+		end
+		local add = -1
+		if user then
+			local ctrl = user:get_player_control()
+			if ctrl.sneak then
+				add = -8
+			end
+		end
+		local node = minetest.get_node(pos)
+		node.param2 = node.param2 + add
+		minetest.swap_node(pos, node)
+	end,
+})
+
+minetest.register_tool("testtools:node_setter", {
+	description = S("Node Setter"),
+	inventory_image = "testtools_node_setter.png",
+	groups = { testtool = 1, disable_repair = 1 },
+	on_use = function(itemstack, user, pointed_thing)
+		local pos = minetest.get_pointed_thing_position(pointed_thing)
+		if pointed_thing.type == "nothing" then
+			local meta = itemstack:get_meta()
+			meta:set_string("node", "air")
+			meta:set_int("node_param2", 0)
+			if user and user:is_player() then
+				minetest.chat_send_player(user:get_player_name(), S("Now placing: @1 (param2=@2)", "air", 0))
+			end
+			return itemstack
+		elseif pointed_thing.type ~= "node" or (not pos) then
+			return
+		end
+		local node = minetest.get_node(pos)
+		local meta = itemstack:get_meta()
+		meta:set_string("node", node.name)
+		meta:set_int("node_param2", node.param2)
+		if user and user:is_player() then
+			minetest.chat_send_player(user:get_player_name(), S("Now placing: @1 (param2=@2)", node.name, node.param2))
+		end
+		return itemstack
+	end,
+	on_secondary_use = function(itemstack, user, pointed_thing)
+		local meta = itemstack:get_meta()
+		local nodename = meta:get_string("node") or ""
+		local param2 = meta:get_int("node_param2") or 0
+
+		minetest.show_formspec(user:get_player_name(), "testtools:node_setter",
+			"size[4,4]"..
+			"field[0.5,1;3,1;nodename;"..F(S("Node name (itemstring):"))..";"..F(nodename).."]"..
+			"field[0.5,2;3,1;param2;"..F(S("param2:"))..";"..F(tostring(param2)).."]"..
+			"button_exit[0.5,3;3,1;submit;"..F(S("Submit")).."]"
+		)
+	end,
+	on_place = function(itemstack, user, pointed_thing)
+		local pos = minetest.get_pointed_thing_position(pointed_thing)
+		local meta = itemstack:get_meta()
+		local nodename = meta:get_string("node")
+		if nodename == "" and user and user:is_player() then
+			minetest.chat_send_player(user:get_player_name(), S("Punch a node first!"))
+			return
+		end
+		local param2 = meta:get_int("node_param2")
+		if not param2 then
+			param2 = 0
+		end
+		local node = { name = nodename, param2 = param2 }
+		if not minetest.registered_nodes[nodename] then
+			minetest.chat_send_player(user:get_player_name(), S("Cannot set unknown node: @1", nodename))
+			return
+		end
+		minetest.set_node(pos, node)
+	end,
+})
+
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	if formname == "testtools:node_setter" then
+		local playername = player:get_player_name()
+		local witem = player:get_wielded_item()
+		if witem:get_name() == "testtools:node_setter" then
+			if fields.nodename and fields.param2 then
+				local param2 = tonumber(fields.param2)
+				if not param2 then
+					return
+				end
+				local meta = witem:get_meta()
+				meta:set_string("node", fields.nodename)
+				meta:set_int("node_param2", param2)
+				player:set_wielded_item(witem)
+			end
+		end
+	end
+end)
+
+minetest.register_tool("testtools:remover", {
+	description = S("Remover"),
+	inventory_image = "testtools_remover.png",
+	groups = { testtool = 1, disable_repair = 1 },
+	on_use = function(itemstack, user, pointed_thing)
+		local pos = minetest.get_pointed_thing_position(pointed_thing)
+		if pointed_thing.type == "node" and pos ~= nil then
+			minetest.remove_node(pos)
+		elseif pointed_thing.type == "object" then
+			local obj = pointed_thing.ref
+			if not obj:is_player() then
+				obj:remove()
+			end
+		end
+	end,
+})
+
+minetest.register_tool("testtools:falling_node_tool", {
+	description = S("Falling Node Tool"),
+	inventory_image = "testtools_falling_node_tool.png",
+	groups = { testtool = 1, disable_repair = 1 },
+	on_place = function(itemstack, user, pointed_thing)
+		-- Teleport node 1-2 units upwards (if possible) and make it fall
+		local pos = minetest.get_pointed_thing_position(pointed_thing)
+		if pointed_thing.type ~= "node" or (not pos) then
+			return
+		end
+		local ok = false
+		local highest
+		for i=1,2 do
+			local above = {x=pos.x,y=pos.y+i,z=pos.z}
+			local n2 = minetest.get_node(above)
+			local def2 = minetest.registered_nodes[n2.name]
+			if def2 and (not def2.walkable) then
+				highest = above
+			else
+				break
+			end
+		end
+		if highest then
+			local node = minetest.get_node(pos)
+			local metatable = minetest.get_meta(pos):to_table()
+			minetest.remove_node(pos)
+			minetest.set_node(highest, node)
+			local meta_highest = minetest.get_meta(highest)
+			meta_highest:from_table(metatable)
+			ok = minetest.spawn_falling_node(highest)
+		else
+			ok = minetest.spawn_falling_node(pos)
+		end
+		if not ok and user and user:is_player() then
+			minetest.chat_send_player(user:get_player_name(), S("Falling node could not be spawned!"))
+		end
+	end,
+	on_use = function(itemstack, user, pointed_thing)
+		local pos = minetest.get_pointed_thing_position(pointed_thing)
+		if pointed_thing.type ~= "node" or (not pos) then
+			return
+		end
+		local ok = minetest.spawn_falling_node(pos)
+		if not ok and user and user:is_player() then
+			minetest.chat_send_player(user:get_player_name(), S("Falling node could not be spawned!"))
+		end
+	end,
+})
+
+minetest.register_tool("testtools:rotator", {
+	description = S("Entity Rotator"),
+	inventory_image = "testtools_entity_rotator.png",
+	groups = { testtool = 1, disable_repair = 1 },
+	on_use = function(itemstack, user, pointed_thing)
+		if pointed_thing.type ~= "object" then
+			return
+		end
+		local obj = pointed_thing.ref
+		if obj:is_player() then
+			-- No player rotation
+			return
+		else
+			local axis = "y"
+			if user and user:is_player() then
+				local ctrl = user:get_player_control()
+				if ctrl.sneak then
+					axis = "x"
+				elseif ctrl.aux1 then
+					axis = "z"
+				end
+			end
+			local rot = obj:get_rotation()
+			rot[axis] = rot[axis] + math.pi/8
+			if rot[axis] > math.pi*2 then
+				rot[axis] = rot[axis] - math.pi*2
+			end
+			obj:set_rotation(rot)
+		end
+	end,
+})
+
+local mover_config = function(itemstack, user, pointed_thing)
+	if not (user and user:is_player()) then
+		return
+	end
+	local name = user:get_player_name()
+	local ctrl = user:get_player_control()
+	local meta = itemstack:get_meta()
+	local dist = 1.0
+	if meta:contains("distance") then
+		dist = meta:get_int("distance")
+	end
+	if ctrl.sneak then
+		dist = dist - 1
+	else
+		dist = dist + 1
+	end
+	meta:set_int("distance", dist)
+	minetest.chat_send_player(user:get_player_name(), S("distance=@1/10", dist*2))
+	return itemstack
+end
+
+minetest.register_tool("testtools:object_mover", {
+	description = S("Object Mover"),
+	inventory_image = "testtools_object_mover.png",
+	groups = { testtool = 1, disable_repair = 1 },
+	on_place = mover_config,
+	on_secondary_use = mover_config,
+	on_use = function(itemstack, user, pointed_thing)
+		if pointed_thing.type ~= "object" then
+			return
+		end
+		local obj = pointed_thing.ref
+		if not (user and user:is_player()) then
+			return
+		end
+		local yaw = user:get_look_horizontal()
+		local dir = minetest.yaw_to_dir(yaw)
+		local pos = obj:get_pos()
+		local pitch = user:get_look_vertical()
+		if pitch > 0.25 * math.pi then
+			dir.y = -1
+			dir.x = 0
+			dir.z = 0
+		elseif pitch < -0.25 * math.pi then
+			dir.y = 1
+			dir.x = 0
+			dir.z = 0
+		end
+		local ctrl = user:get_player_control()
+		if ctrl.sneak then
+			dir = vector.multiply(dir, -1)
+		end
+		local meta = itemstack:get_meta()
+		if meta:contains("distance") then
+			local dist = meta:get_int("distance")
+			dir = vector.multiply(dir, dist*0.2)
+		end
+		pos = vector.add(pos, dir)
+		obj:set_pos(pos)
+	end,
+})
+
+
+
+minetest.register_tool("testtools:entity_scaler", {
+	description = S("Entity Visual Scaler"),
+	inventory_image = "testtools_entity_scaler.png",
+	groups = { testtool = 1, disable_repair = 1 },
+	on_use = function(itemstack, user, pointed_thing)
+		if pointed_thing.type ~= "object" then
+			return
+		end
+		local obj = pointed_thing.ref
+		if obj:is_player() then
+			-- No player scaling
+			return
+		else
+			local diff = 0.1
+			if user and user:is_player() then
+				local ctrl = user:get_player_control()
+				if ctrl.sneak then
+					diff = -0.1
+				end
+			end
+			local prop = obj:get_properties()
+			if not prop.visual_size then
+				prop.visual_size = { x=1, y=1, z=1 }
+			else
+				prop.visual_size = { x=prop.visual_size.x+diff, y=prop.visual_size.y+diff, z=prop.visual_size.z+diff }
+				if prop.visual_size.x <= 0.1 then
+					prop.visual_size.x = 0.1
+				end
+				if prop.visual_size.y <= 0.1 then
+					prop.visual_size.y = 0.1
+				end
+				if prop.visual_size.z <= 0.1 then
+					prop.visual_size.z = 0.1
+				end
+			end
+			obj:set_properties(prop)
+		end
+	end,
+})
+
+local selections = {}
+local entity_list
+local function get_entity_list()
+	if entity_list then
+		return entity_list
+	end
+	local ents = minetest.registered_entities
+	local list = {}
+	for k,_ in pairs(ents) do
+		table.insert(list, k)
+	end
+	table.sort(list)
+	entity_list = list
+	return entity_list
+end
+minetest.register_tool("testtools:entity_spawner", {
+	description = S("Entity Spawner"),
+	inventory_image = "testtools_entity_spawner.png",
+	groups = { testtool = 1, disable_repair = 1 },
+	on_place = function(itemstack, user, pointed_thing)
+		local name = user:get_player_name()
+		if selections[name] and pointed_thing.type == "node" then
+			local pos = pointed_thing.above
+			minetest.add_entity(pos, get_entity_list()[selections[name]])
+		end
+	end,
+	on_use = function(itemstack, user, pointed_thing)
+		if pointed_thing.type == "object" then
+			return
+		end
+		if user and user:is_player() then
+			local list = table.concat(get_entity_list(), ",")
+			local name = user:get_player_name()
+			local sel = selections[name] or ""
+			minetest.show_formspec(name, "testtools:entity_list",
+				"size[9,9]"..
+				"textlist[0,0;9,8;entity_list;"..list..";"..sel..";false]"..
+				"button[0,8;4,1;spawn;Spawn entity]"
+			)
+		end
+	end,
+})
+
+local function prop_to_string(property)
+	if type(property) == "string" then
+		return "\"" .. property .. "\""
+	elseif type(property) == "table" then
+		return tostring(dump(property)):gsub("\n", "")
+	else
+		return tostring(property)
+	end
+end
+
+local property_formspec_data = {}
+local property_formspec_index = {}
+local selected_objects = {}
+local function get_object_properties_form(obj, playername)
+	if not playername then return "" end
+	local props = obj:get_properties()
+	local str = ""
+	property_formspec_data[playername] = {}
+	local proplist = {}
+	for k,_ in pairs(props) do
+		table.insert(proplist, k)
+	end
+	table.sort(proplist)
+	for p=1, #proplist do
+		local k = proplist[p]
+		local v = props[k]
+		local newline = ""
+		newline = k .. " = "
+		newline = newline .. prop_to_string(v)
+		str = str .. F(newline)
+		if p < #proplist then
+			str = str .. ","
+		end
+		table.insert(property_formspec_data[playername], k)
+	end
+	return str
+end
+
+local editor_formspec_selindex = {}
+
+local editor_formspec = function(playername, obj, value, sel)
+	if not value then
+		value = ""
+	end
+	if not sel then
+		sel = ""
+	end
+	local list = get_object_properties_form(obj, playername)
+	local title
+	if obj:is_player() then
+		title = S("Object properties of player “@1”", obj:get_player_name())
+	else
+		local ent = obj:get_luaentity()
+		title = S("Object properties of @1", ent.name)
+	end
+	minetest.show_formspec(playername, "testtools:object_editor",
+		"size[9,9]"..
+		"label[0,0;"..F(title).."]"..
+		"textlist[0,0.5;9,7.5;object_props;"..list..";"..sel..";false]"..
+		"field[0.2,8.75;8,1;value;"..F(S("Value"))..";"..F(value).."]"..
+		"button[8,8.5;1,1;submit;"..F(S("Submit")).."]"
+	)
+end
+
+minetest.register_tool("testtools:object_editor", {
+	description = S("Object Property Editor"),
+	inventory_image = "testtools_object_editor.png",
+	groups = { testtool = 1, disable_repair = 1 },
+	on_use = function(itemstack, user, pointed_thing)
+		if user and user:is_player() then
+			local name = user:get_player_name()
+
+			if pointed_thing.type == "object" then
+				selected_objects[name] = pointed_thing.ref
+			elseif pointed_thing.type == "nothing" then
+				-- Use on yourself if pointing nothing
+				selected_objects[name] = user
+			else
+				-- Unsupported pointed thing
+				return
+			end
+
+			local sel = editor_formspec_selindex[name]
+			local val
+			if selected_objects[name] and selected_objects[name]:get_properties() then
+				local props = selected_objects[name]:get_properties()
+				local keys = property_formspec_data[name]
+				if property_formspec_index[name] and props then
+					local key = keys[property_formspec_index[name]]
+					val = prop_to_string(props[key])
+				end
+			end
+
+			editor_formspec(name, selected_objects[name], val, sel)
+		end
+	end,
+})
+
+local ent_parent = {}
+local ent_child = {}
+local DEFAULT_ATTACH_OFFSET_Y = 11
+
+local attacher_config = function(itemstack, user, pointed_thing)
+	if not (user and user:is_player()) then
+		return
+	end
+	if pointed_thing.type == "object" then
+		return
+	end
+	local name = user:get_player_name()
+	local ctrl = user:get_player_control()
+	local meta = itemstack:get_meta()
+	if ctrl.aux1 then
+		local rot_x = meta:get_float("rot_x")
+		if ctrl.sneak then
+			rot_x = rot_x - math.pi/8
+		else
+			rot_x = rot_x + math.pi/8
+		end
+		if rot_x > 6.2 then
+			rot_x = 0
+		elseif rot_x < 0 then
+			rot_x = math.pi * (15/8)
+		end
+		minetest.chat_send_player(name, S("rotation=@1", minetest.pos_to_string({x=rot_x,y=0,z=0})))
+		meta:set_float("rot_x", rot_x)
+	else
+		local pos_y
+		if meta:contains("pos_y") then
+			pos_y = meta:get_int("pos_y")
+		else
+			pos_y = DEFAULT_ATTACH_OFFSET_Y
+		end
+		if ctrl.sneak then
+			pos_y = pos_y - 1
+		else
+			pos_y = pos_y + 1
+		end
+		minetest.chat_send_player(name, S("position=@1", minetest.pos_to_string({x=0,y=pos_y,z=0})))
+		meta:set_int("pos_y", pos_y)
+	end
+	return itemstack
+end
+
+minetest.register_tool("testtools:object_attacher", {
+	description = S("Object Attacher"),
+	inventory_image = "testtools_object_attacher.png",
+	groups = { testtool = 1, disable_repair = 1 },
+	on_place = attacher_config,
+	on_secondary_use = attacher_config,
+	on_use = function(itemstack, user, pointed_thing)
+		if user and user:is_player() then
+			local name = user:get_player_name()
+			local selected_object
+			if pointed_thing.type == "object" then
+				selected_object = pointed_thing.ref
+			elseif pointed_thing.type == "nothing" then
+				selected_object = user
+			else
+				return
+			end
+			local ctrl = user:get_player_control()
+			if ctrl.sneak then
+				if selected_object:get_attach() then
+					selected_object:set_detach()
+					minetest.chat_send_player(name, S("Object detached!"))
+				else
+					minetest.chat_send_player(name, S("Object is not attached!"))
+				end
+				return
+			end
+			local parent = ent_parent[name]
+			local child = ent_child[name]
+			local ename = S("<unknown>")
+			if not parent then
+				parent = selected_object
+				ent_parent[name] = parent
+			elseif not child then
+				child = selected_object
+				ent_child[name] = child
+			end
+			local entity = selected_object:get_luaentity()
+			if entity then
+				ename = entity.name
+			elseif selected_object:is_player() then
+				ename = selected_object:get_player_name()
+			end
+			if selected_object == parent then
+				minetest.chat_send_player(name, S("Parent object selected: @1", ename))
+			elseif selected_object == child then
+				minetest.chat_send_player(name, S("Child object selected: @1", ename))
+			end
+			if parent and child then
+				if parent == child then
+					minetest.chat_send_player(name, S("Can't attach an object to itself!"))
+					ent_parent[name] = nil
+					ent_child[name] = nil
+					return
+				end
+				local meta = itemstack:get_meta()
+				local y
+				if meta:contains("pos_y") then
+					y = meta:get_int("pos_y")
+				else
+					y = DEFAULT_ATTACH_OFFSET_Y
+				end
+				local rx = meta:get_float("rot_x") or 0
+				local offset = {x=0,y=y,z=0}
+				local angle = {x=rx,y=0,z=0}
+				child:set_attach(parent, "", offset, angle)
+				local check_parent = child:get_attach()
+				if check_parent then
+					minetest.chat_send_player(name, S("Object attached! position=@1, rotation=@2",
+						minetest.pos_to_string(offset), minetest.pos_to_string(angle)))
+				else
+					minetest.chat_send_player(name, S("Attachment failed!"))
+				end
+				ent_parent[name] = nil
+				ent_child[name] = nil
+			end
+		end
+	end,
+})
+
+-- Use loadstring to parse param as a Lua value
+local function use_loadstring(param, player)
+	-- For security reasons, require 'server' priv, just in case
+	-- someone is actually crazy enough to run this on a public server.
+	local privs = minetest.get_player_privs(player:get_player_name())
+	if not privs.server then
+		return false, "You need 'server' privilege to change object properties!"
+	end
+	if not param then
+		return false, "Failed: parameter is nil"
+	end
+	--[[ DANGER ZONE ]]
+	-- Interpret string as Lua value
+	local func, errormsg = loadstring("return (" .. param .. ")")
+	if not func then
+		return false, "Failed: " .. errormsg
+	end
+
+	-- Apply sandbox here using setfenv
+	setfenv(func, {})
+
+	-- Run it
+	local good, errOrResult = pcall(func)
+	if not good then
+		-- A Lua error was thrown
+		return false, "Failed: " .. errOrResult
+	end
+
+	-- errOrResult will be the value
+	return true, errOrResult
+end
+
+minetest.register_on_player_receive_fields(function(player, formname, fields)
+	if not (player and player:is_player()) then
+		return
+	end
+	if formname == "testtools:entity_list" then
+		local name = player:get_player_name()
+		if fields.entity_list then
+			local expl = minetest.explode_textlist_event(fields.entity_list)
+			if expl.type == "DCL" then
+				local pos = vector.add(player:get_pos(), {x=0,y=1,z=0})
+				selections[name] = expl.index
+				minetest.add_entity(pos, get_entity_list()[expl.index])
+				return
+			elseif expl.type == "CHG" then
+				selections[name] = expl.index
+				return
+			end
+		elseif fields.spawn and selections[name] then
+			local pos = vector.add(player:get_pos(), {x=0,y=1,z=0})
+			minetest.add_entity(pos, get_entity_list()[selections[name]])
+			return
+		end
+	elseif formname == "testtools:object_editor" then
+		local name = player:get_player_name()
+		if fields.object_props then
+			local expl = minetest.explode_textlist_event(fields.object_props)
+			if expl.type == "DCL" or expl.type == "CHG" then
+				property_formspec_index[name] = expl.index
+
+				local props = selected_objects[name]:get_properties()
+				local keys = property_formspec_data[name]
+				if (not property_formspec_index[name]) or (not props) then
+					return
+				end
+				local key = keys[property_formspec_index[name]]
+				editor_formspec_selindex[name] = expl.index
+				editor_formspec(name, selected_objects[name], prop_to_string(props[key]), expl.index)
+				return
+			end
+		end
+		if fields.submit then
+			local props = selected_objects[name]:get_properties()
+			local keys = property_formspec_data[name]
+			if (not property_formspec_index[name]) or (not props) then
+				return
+			end
+			local key = keys[property_formspec_index[name]]
+			if not key then
+				return
+			end
+			local success, str = use_loadstring(fields.value, player)
+			if success then
+				props[key] = str
+			else
+				minetest.chat_send_player(name, str)
+				return
+			end
+			selected_objects[name]:set_properties(props)
+			local sel = editor_formspec_selindex[name]
+			editor_formspec(name, selected_objects[name], prop_to_string(props[key]), sel)
+			return
+		end
+	end
+end)
diff --git a/games/minimal/mods/testtools/mod.conf b/games/minimal/mods/testtools/mod.conf
new file mode 100644
index 000000000..cde1b2685
--- /dev/null
+++ b/games/minimal/mods/testtools/mod.conf
@@ -0,0 +1,2 @@
+name = testtools
+description = Some tools to directly manipulate nodes and entities. Great for development and testing
diff --git a/games/minimal/mods/testtools/textures/testtools_entity_rotator.png b/games/minimal/mods/testtools/textures/testtools_entity_rotator.png
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diff --git a/games/minimal/mods/testtools/textures/testtools_param2tool.png b/games/minimal/mods/testtools/textures/testtools_param2tool.png
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