Add command block:

* not obtainable legitimately in Survival mode
* found in Creative inventory or using /giveme mesecons_commandblock:commandblock_off
* glows slightly when turned on
* runs a command in the context of the targeted player
* player can be targeted by name, or using the special forms (@nearest, @farthest, @random)
* when powered, runs its command with its parameters
* right click to bring up the configuration screen
* diggable and modifiable only by its owner, the person who placed it

2 files changed, 158 insertions, 0 deletions

diff --git a/mesecons_commandblock/depends.txt b/mesecons_commandblock/depends.txt
new file mode 100644
index 0000000..acaa924
--- /dev/null
+++ b/mesecons_commandblock/depends.txt
@@ -0,0 +1 @@
+mesecons
diff --git a/mesecons_commandblock/init.lua b/mesecons_commandblock/init.lua
new file mode 100644
index 0000000..345ca7c
--- /dev/null
+++ b/mesecons_commandblock/init.lua
@@ -0,0 +1,157 @@
+local initialize_data = function(meta, player, command, param)

+	meta:set_string("formspec",

+		"invsize[9,6;]" ..

+		"field[1,1;7.5,1;player;Player;" .. player .. "]" ..

+		"button[1.3,2;2,1;nearest;Nearest]" ..

+		"button[3.3,2;2,1;farthest;Farthest]" ..

+		"button[5.3,2;2,1;random;Random]" ..

+		"field[1,4;2,1;command;Command;" .. command .. "]" ..

+		"field[3,4;5.5,1;param;Parameter;" .. param .. "]" ..

+		"button_exit[3.3,5;2,1;submit;Submit]")

+	local owner = meta:get_string("owner")

+	if owner == "" then

+		owner = "not owned"

+	else

+		owner = "owned by " .. owner

+	end

+	meta:set_string("infotext", "Command Block\n" ..

+		"(" .. owner .. ")\n" ..

+		"Command: /" .. command .. " " .. param)

+end

+

+local construct = function(pos)

+	local meta = minetest.env:get_meta(pos)

+

+	meta:set_string("player", "@nearest")

+	meta:set_string("command", "time")

+	meta:set_string("param", "7000")

+

+	meta:set_string("owner", "")

+

+	initialize_data(meta, "@nearest", "time", "7000")

+end

+

+local after_place = function(pos, placer)

+	if placer then

+		local meta = minetest.env:get_meta(pos)

+		meta:set_string("owner", placer:get_player_name())

+		initialize_data(meta, "@nearest", "time", "7000")

+	end

+end

+

+local receive_fields = function(pos, formname, fields, sender)

+	local meta = minetest.env:get_meta(pos)

+	if fields.nearest then

+		initialize_data(meta, "@nearest", fields.command, fields.param)

+	elseif fields.farthest then

+		initialize_data(meta, "@farthest", fields.command, fields.param)

+	elseif fields.random then

+		initialize_data(meta, "@random", fields.command, fields.param)

+	else --fields.submit or pressed enter

+		meta:set_string("player", fields.player)

+		meta:set_string("command", fields.command)

+		meta:set_string("param", fields.param)

+

+		initialize_data(meta, fields.player, fields.command, fields.param)

+	end

+end

+

+local resolve_player = function(name, pos)

+	local get_distance = function(pos1, pos2)

+		return math.sqrt((pos1.x - pos2.x) ^ 2 + (pos1.y - pos2.y) ^ 2 + (pos1.z - pos2.z) ^ 2)

+	end

+

+	if name == "@nearest" then

+		local min_distance = math.huge

+		for index, player in ipairs(minetest.get_connected_players()) do

+			local distance = get_distance(pos, player:getpos())

+			if distance < min_distance then

+				min_distance = distance

+				name = player:get_player_name()

+			end

+		end

+	elseif name == "@farthest" then

+		local max_distance = -1

+		for index, player in ipairs(minetest.get_connected_players()) do

+			local distance = get_distance(pos, player:getpos())

+			if distance > max_distance then

+				max_distance = distance

+				name = player:get_player_name()

+			end

+		end

+	elseif name == "@random" then

+		local players = minetest.get_connected_players()

+		local player = players[math.random(#players)]

+		name = player:get_player_name()

+	end

+	return name

+end

+

+minetest.register_node("mesecons_commandblock:commandblock_off", {

+	description = "Command Block",

+	tiles = {"jeija_commandblock_off.png"},

+	inventory_image = minetest.inventorycube("jeija_commandblock_off.png"),

+	groups = {cracky=2, mesecon_effector_off=1, mesecon=2},

+	on_construct = construct,

+	after_place_node = after_place,

+	on_receive_fields = receive_fields,

+	can_dig = function(pos,player)

+		local owner = minetest.env:get_meta(pos):get_string("owner")

+		return owner == "" or owner == player:get_player_name()

+	end,

+})

+

+minetest.register_node("mesecons_commandblock:commandblock_on", {

+	tiles = {"jeija_commandblock_on.png"},

+	groups = {cracky=2, mesecon_effector_on=1, mesecon=2, not_in_creative_inventory=1},

+	light_source = 10,

+	drop = "mesecons_commandblock:commandblock_off",

+	on_construct = construct,

+	after_place_node = after_place,

+	on_receive_fields = receive_fields,

+	can_dig = function(pos,player)

+		local owner = minetest.env:get_meta(pos):get_string("owner")

+		return owner == "" or owner == player:get_player_name()

+	end,

+})

+

+mesecon:register_effector("mesecons_commandblock:commandblock_on", "mesecons_commandblock:commandblock_off")

+

+local swap_node = function(pos, name)

+	local node = minetest.env:get_node(pos)

+	local data = minetest.env:get_meta(pos):to_table()

+	node.name = name

+	minetest.env:add_node(pos, node)

+	minetest.env:get_meta(pos):from_table(data)

+end

+

+mesecon:register_on_signal_on(function(pos, node)

+	if node.name ~= "mesecons_commandblock:commandblock_off" then

+		return

+	end

+

+	swap_node(pos, "mesecons_commandblock:commandblock_on")

+

+	local meta = minetest.env:get_meta(pos)

+	local command = minetest.chatcommands[meta:get_string("command")]

+	if command == nil then

+		return

+	end

+	local owner = meta:get_string("owner")

+	if owner == "" then

+		return

+	end

+	local has_privs, missing_privs = minetest.check_player_privs(owner, command.privs)

+	if not has_privs then

+		minetest.chat_send_player(owner, "You don't have permission to run this command (missing privileges: "..table.concat(missing_privs, ", ")..")")

+		return

+	end

+	local player = resolve_player(meta:get_string("player"), pos)

+	command.func(player, meta:get_string("param"))

+end)

+

+mesecon:register_on_signal_off(function(pos, node)

+	if node.name == "mesecons_commandblock:commandblock_on" then

+		swap_node(pos, "mesecons_commandblock:commandblock_off")

+	end

+end)
\ No newline at end of file