path: root/builtin/game/register.lua

-- Minetest: builtin/misc_register.lua

--
-- Make raw registration functions inaccessible to anyone except this file
--

local register_item_raw = core.register_item_raw
core.register_item_raw = nil

local register_alias_raw = core.register_alias_raw
core.register_item_raw = nil

--
-- Item / entity / ABM registration functions
--

core.registered_abms = {}
core.registered_entities = {}
core.registered_items = {}
core.registered_nodes = {}
core.registered_craftitems = {}
core.registered_tools = {}
core.registered_aliases = {}

-- For tables that are indexed by item name:
-- If table[X] does not exist, default to table[core.registered_aliases[X]]
local alias_metatable = {
	__index = function(t, name)
		return rawget(t, core.registered_aliases[name])
	end
}
setmetatable(core.registered_items, alias_metatable)
setmetatable(core.registered_nodes, alias_metatable)
setmetatable(core.registered_craftitems, alias_metatable)
setmetatable(core.registered_tools, alias_metatable)

-- These item names may not be used because they would interfere
-- with legacy itemstrings
local forbidden_item_names = {
	MaterialItem = true,
	MaterialItem2 = true,
	MaterialItem3 = true,
	NodeItem = true,
	node = true,
	CraftItem = true,
	craft = true,
	MBOItem = true,
	ToolItem = true,
	tool = true,
}

local function check_modname_prefix(name)
	if name:sub(1,1) == ":" then
		-- Escape the modname prefix enforcement mechanism
		return name:sub(2)
	else
		-- Modname prefix enforcement
		local expected_prefix = core.get_current_modname() .. ":"
		if name:sub(1, #expected_prefix) ~= expected_prefix then
			error("Name " .. name .. " does not follow naming conventions: " ..
				"\"modname:\" or \":\" prefix required")
		end
		local subname = name:sub(#expected_prefix+1)
		if subname:find("[^abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_]") then
			error("Name " .. name .. " does not follow naming conventions: " ..
				"contains unallowed characters")
		end
		return name
	end
end

function core.register_abm(spec)
	-- Add to core.registered_abms
	core.registered_abms[#core.registered_abms+1] = spec
end

function core.register_entity(name, prototype)
	-- Check name
	if name == nil then
		error("Unable to register entity: Name is nil")
	end
	name = check_modname_prefix(tostring(name))

	prototype.name = name
	prototype.__index = prototype  -- so that it can be used as a metatable

	-- Add to core.registered_entities
	core.registered_entities[name] = prototype
end

function core.register_item(name, itemdef)
	-- Check name
	if name == nil then
		error("Unable to register item: Name is nil")
	end
	name = check_modname_prefix(tostring(name))
	if forbidden_item_names[name] then
		error("Unable to register item: Name is forbidden: " .. name)
	end
	itemdef.name = name

	-- Apply defaults and add to registered_* table
	if itemdef.type == "node" then
		-- Use the nodebox as selection box if it's not set manually
		if itemdef.drawtype == "nodebox" and not itemdef.selection_box then
			itemdef.selection_box = itemdef.node_box
		elseif itemdef.drawtype == "fencelike" and not itemdef.selection_box then
			itemdef.selection_box = {
				type = "fixed",
				fixed = {-1/8, -1/2, -1/8, 1/8, 1/2, 1/8},
			}
		end
		setmetatable(itemdef, {__index = core.nodedef_default})
		core.registered_nodes[itemdef.name] = itemdef
	elseif itemdef.type == "craft" then
		setmetatable(itemdef, {__index = core.craftitemdef_default})
		core.registered_craftitems[itemdef.name] = itemdef
	elseif itemdef.type == "tool" then
		setmetatable(itemdef, {__index = core.tooldef_default})
		core.registered_tools[itemdef.name] = itemdef
	elseif itemdef.type == "none" then
		setmetatable(itemdef, {__index = core.noneitemdef_default})
	else
		error("Unable to register item: Type is invalid: " .. dump(itemdef))
	end

	-- Flowing liquid uses param2
	if itemdef.type == "node" and itemdef.liquidtype == "flowing" then
		itemdef.paramtype2 = "flowingliquid"
	end

	-- BEGIN Legacy stuff
	if itemdef.cookresult_itemstring ~= nil and itemdef.cookresult_itemstring ~= "" then
		core.register_craft({
			type="cooking",
			output=itemdef.cookresult_itemstring,
			recipe=itemdef.name,
			cooktime=itemdef.furnace_cooktime
		})
	end
	if itemdef.furnace_burntime ~= nil and itemdef.furnace_burntime >= 0 then
		core.register_craft({
			type="fuel",
			recipe=itemdef.name,
			burntime=itemdef.furnace_burntime
		})
	end
	-- END Legacy stuff

	-- Disable all further modifications
	getmetatable(itemdef).__newindex = {}

	--core.log("Registering item: " .. itemdef.name)
	core.registered_items[itemdef.name] = itemdef
	core.registered_aliases[itemdef.name] = nil
	register_item_raw(itemdef)
end

function core.register_node(name, nodedef)
	nodedef.type = "node"
	core.register_item(name, nodedef)
end

function core.register_craftitem(name, craftitemdef)
	craftitemdef.type = "craft"

	-- BEGIN Legacy stuff
	if craftitemdef.inventory_image == nil and craftitemdef.image ~= nil then
		craftitemdef.inventory_image = craftitemdef.image
	end
	-- END Legacy stuff

	core.register_item(name, craftitemdef)
end

function core.register_tool(name, tooldef)
	tooldef.type = "tool"
	tooldef.stack_max = 1

	-- BEGIN Legacy stuff
	if tooldef.inventory_image == nil and tooldef.image ~= nil then
		tooldef.inventory_image = tooldef.image
	end
	if tooldef.tool_capabilities == nil and
	   (tooldef.full_punch_interval ~= nil or
	    tooldef.basetime ~= nil or
	    tooldef.dt_weight ~= nil or
	    tooldef.dt_crackiness ~= nil or
	    tooldef.dt_crumbliness ~= nil or
	    tooldef.dt_cuttability ~= nil or
	    tooldef.basedurability ~= nil or
	    tooldef.dd_weight ~= nil or
	    tooldef.dd_crackiness ~= nil or
	    tooldef.dd_crumbliness ~= nil or
	    tooldef.dd_cuttability ~= nil) then
		tooldef.tool_capabilities = {
			full_punch_interval = tooldef.full_punch_interval,
			basetime = tooldef.basetime,
			dt_weight = tooldef.dt_weight,
			dt_crackiness = tooldef.dt_crackiness,
			dt_crumbliness = tooldef.dt_crumbliness,
			dt_cuttability = tooldef.dt_cuttability,
			basedurability = tooldef.basedurability,
			dd_weight = tooldef.dd_weight,
			dd_crackiness = tooldef.dd_crackiness,
			dd_crumbliness = tooldef.dd_crumbliness,
			dd_cuttability = tooldef.dd_cuttability,
		}
	end
	-- END Legacy stuff

	core.register_item(name, tooldef)
end

function core.register_alias(name, convert_to)
	if forbidden_item_names[name] then
		error("Unable to register alias: Name is forbidden: " .. name)
	end
	if core.registered_items[name] ~= nil then
		core.log("WARNING: Not registering alias, item with same name" ..
			" is already defined: " .. name .. " -> " .. convert_to)
	else
		--core.log("Registering alias: " .. name .. " -> " .. convert_to)
		core.registered_aliases[name] = convert_to
		register_alias_raw(name, convert_to)
	end
end

local register_biome_raw = core.register_biome
core.registered_biomes = {}
function core.register_biome(biome)
	core.registered_biomes[biome.name] = biome
	register_biome_raw(biome)
end

function core.on_craft(itemstack, player, old_craft_list, craft_inv)
	for _, func in ipairs(core.registered_on_crafts) do
		itemstack = func(itemstack, player, old_craft_list, craft_inv) or itemstack
	end
	return itemstack
end

function core.craft_predict(itemstack, player, old_craft_list, craft_inv)
	for _, func in ipairs(core.registered_craft_predicts) do
		itemstack = func(itemstack, player, old_craft_list, craft_inv) or itemstack
	end
	return itemstack
end

-- Alias the forbidden item names to "" so they can't be
-- created via itemstrings (e.g. /give)
local name
for name in pairs(forbidden_item_names) do
	core.registered_aliases[name] = ""
	register_alias_raw(name, "")
end


-- Deprecated:
-- Aliases for core.register_alias (how ironic...)
--core.alias_node = core.register_alias
--core.alias_tool = core.register_alias
--core.alias_craftitem = core.register_alias

--
-- Built-in node definitions. Also defined in C.
--
an class="hl opt">=true}) then
				return false, "Your privileges are insufficient."
			end
			if not core.registered_privileges[priv] then
				privs_unknown = privs_unknown .. "Unknown privilege: " .. priv .. "\n"
			end
			privs[priv] = true
		end
		if privs_unknown ~= "" then
			return false, privs_unknown
		end
		core.set_player_privs(grantname, privs)
		core.log("action", name..' granted ('..core.privs_to_string(grantprivs, ', ')..') privileges to '..grantname)
		if grantname ~= name then
			core.chat_send_player(grantname, name
					.. " granted you privileges: "
					.. core.privs_to_string(grantprivs, ' '))
		end
		return true, "Privileges of " .. grantname .. ": "
			.. core.privs_to_string(
				core.get_player_privs(grantname), ' ')
	end,
})
core.register_chatcommand("revoke", {
	params = "<name> <privilege>|all",
	description = "Remove privilege from player",
	privs = {},
	func = function(name, param)
		if not core.check_player_privs(name, {privs=true}) and
				not core.check_player_privs(name, {basic_privs=true}) then
			return false, "Your privileges are insufficient."
		end
		local revoke_name, revoke_priv_str = string.match(param, "([^ ]+) (.+)")
		if not revoke_name or not revoke_priv_str then
			return false, "Invalid parameters (see /help revoke)"
		elseif not core.auth_table[revoke_name] then
			return false, "Player " .. revoke_name .. " does not exist."
		end
		local revoke_privs = core.string_to_privs(revoke_priv_str)
		local privs = core.get_player_privs(revoke_name)
		for priv, _ in pairs(revoke_privs) do
			if priv ~= "interact" and priv ~= "shout" and priv ~= "interact_extra" and
					not core.check_player_privs(name, {privs=true}) then
				return false, "Your privileges are insufficient."
			end
		end
		if revoke_priv_str == "all" then
			privs = {}
		else
			for priv, _ in pairs(revoke_privs) do
				privs[priv] = nil
			end
		end
		core.set_player_privs(revoke_name, privs)
		core.log("action", name..' revoked ('
				..core.privs_to_string(revoke_privs, ', ')
				..') privileges from '..revoke_name)
		if revoke_name ~= name then
			core.chat_send_player(revoke_name, name
					.. " revoked privileges from you: "
					.. core.privs_to_string(revoke_privs, ' '))
		end
		return true, "Privileges of " .. revoke_name .. ": "
			.. core.privs_to_string(
				core.get_player_privs(revoke_name), ' ')
	end,
})

core.register_chatcommand("setpassword", {
	params = "<name> <password>",
	description = "set given password",
	privs = {password=true},
	func = function(name, param)
		local toname, raw_password = string.match(param, "^([^ ]+) +(.+)$")
		if not toname then
			toname = param:match("^([^ ]+) *$")
			raw_password = nil
		end
		if not toname then
			return false, "Name field required"
		end
		local actstr = "?"
		if not raw_password then
			core.set_player_password(toname, "")
			actstr = "cleared"
		else
			core.set_player_password(toname,
					core.get_password_hash(toname,
							raw_password))
			actstr = "set"
		end
		if toname ~= name then
			core.chat_send_player(toname, "Your password was "
					.. actstr .. " by " .. name)
		end
		return true, "Password of player \"" .. toname .. "\" " .. actstr
	end,
})

core.register_chatcommand("clearpassword", {
	params = "<name>",
	description = "set empty password",
	privs = {password=true},
	func = function(name, param)
		toname = param
		if toname == "" then
			return false, "Name field required"
		end
		core.set_player_password(toname, '')
		return true, "Password of player \"" .. toname .. "\" cleared"
	end,
})

core.register_chatcommand("auth_reload", {
	params = "",
	description = "reload authentication data",
	privs = {server=true},
	func = function(name, param)
		local done = core.auth_reload()
		return done, (done and "Done." or "Failed.")
	end,
})

core.register_chatcommand("teleport", {
	params = "<X>,<Y>,<Z> | <to_name> | <name> <X>,<Y>,<Z> | <name> <to_name>",
	description = "teleport to given position",
	privs = {teleport=true},
	func = function(name, param)
		-- Returns (pos, true) if found, otherwise (pos, false)
		local function find_free_position_near(pos)
			local tries = {
				{x=1,y=0,z=0},
				{x=-1,y=0,z=0},
				{x=0,y=0,z=1},
				{x=0,y=0,z=-1},
			}
			for _, d in ipairs(tries) do
				local p = {x = pos.x+d.x, y = pos.y+d.y, z = pos.z+d.z}
				local n = core.get_node_or_nil(p)
				if n and n.name then
					local def = core.registered_nodes[n.name]
					if def and not def.walkable then
						return p, true
					end
				end
			end
			return pos, false
		end

		local teleportee = nil
		local p = {}
		p.x, p.y, p.z = string.match(param, "^([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+)$")
		p.x = tonumber(p.x)
		p.y = tonumber(p.y)
		p.z = tonumber(p.z)
		teleportee = core.get_player_by_name(name)
		if teleportee and p.x and p.y and p.z then
			teleportee:setpos(p)
			return true, "Teleporting to "..core.pos_to_string(p)
		end
		
		local teleportee = nil
		local p = nil
		local target_name = nil
		target_name = param:match("^([^ ]+)$")
		teleportee = core.get_player_by_name(name)
		if target_name then
			local target = core.get_player_by_name(target_name)
			if target then
				p = target:getpos()
			end
		end
		if teleportee and p then
			p = find_free_position_near(p)
			teleportee:setpos(p)
			return true, "Teleporting to " .. target_name
					.. " at "..core.pos_to_string(p)
		end
		
		if core.check_player_privs(name, {bring=true}) then
			local teleportee = nil
			local p = {}
			local teleportee_name = nil
			teleportee_name, p.x, p.y, p.z = param:match(
					"^([^ ]+) +([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+)$")
			p.x, p.y, p.z = tonumber(p.x), tonumber(p.y), tonumber(p.z)
			if teleportee_name then
				teleportee = core.get_player_by_name(teleportee_name)
			end
			if teleportee and p.x and p.y and p.z then
				teleportee:setpos(p)
				return true, "Teleporting " .. teleportee_name
						.. " to " .. core.pos_to_string(p)
			end
			
			local teleportee = nil
			local p = nil
			local teleportee_name = nil
			local target_name = nil
			teleportee_name, target_name = string.match(param, "^([^ ]+) +([^ ]+)$")
			if teleportee_name then
				teleportee = core.get_player_by_name(teleportee_name)
			end
			if target_name then
				local target = core.get_player_by_name(target_name)
				if target then
					p = target:getpos()
				end
			end
			if teleportee and p then
				p = find_free_position_near(p)
				teleportee:setpos(p)
				return true, "Teleporting " .. teleportee_name
						.. " to " .. target_name
						.. " at " .. core.pos_to_string(p)
			end
		end

		return false, 'Invalid parameters ("' .. param
				.. '") or player not found (see /help teleport)'
	end,
})

core.register_chatcommand("set", {
	params = "[-n] <name> <value> | <name>",
	description = "set or read server configuration setting",
	privs = {server=true},
	func = function(name, param)
		local arg, setname, setvalue = string.match(param, "(-[n]) ([^ ]+) (.+)")
		if arg and arg == "-n" and setname and setvalue then
			core.setting_set(setname, setvalue)
			return true, setname .. " = " .. setvalue
		end
		local setname, setvalue = string.match(param, "([^ ]+) (.+)")
		if setname and setvalue then
			if not core.setting_get(setname) then
				return false, "Failed. Use '/set -n <name> <value>' to create a new setting."
			end
			core.setting_set(setname, setvalue)
			return true, setname .. " = " .. setvalue
		end
		local setname = string.match(param, "([^ ]+)")
		if setname then
			local setvalue = core.setting_get(setname)
			if not setvalue then
				setvalue = "<not set>"
			end
			return true, setname .. " = " .. setvalue
		end
		return false, "Invalid parameters (see /help set)."
	end,
})

core.register_chatcommand("mods", {
	params = "",
	description = "List mods installed on the server",
	privs = {},
	func = function(name, param)
		return true, table.concat(core.get_modnames(), ", ")
	end,
})

local function handle_give_command(cmd, giver, receiver, stackstring)
	core.log("action", giver .. " invoked " .. cmd
			.. ', stackstring="' .. stackstring .. '"')
	local itemstack = ItemStack(stackstring)
	if itemstack:is_empty() then
		return false, "Cannot give an empty item"
	elseif not itemstack:is_known() then
		return false, "Cannot give an unknown item"
	end
	local receiverref = core.get_player_by_name(receiver)
	if receiverref == nil then
		return false, receiver .. " is not a known player"
	end
	local leftover = receiverref:get_inventory():add_item("main", itemstack)
	if leftover:is_empty() then
		partiality = ""
	elseif leftover:get_count() == itemstack:get_count() then
		partiality = "could not be "
	else
		partiality = "partially "
	end
	-- The actual item stack string may be different from what the "giver"
	-- entered (e.g. big numbers are always interpreted as 2^16-1).
	stackstring = itemstack:to_string()
	if giver == receiver then
		return true, ("%q %sadded to inventory.")
				:format(stackstring, partiality)
	else
		core.chat_send_player(receiver, ("%q %sadded to inventory.")
				:format(stackstring, partiality))
		return true, ("%q %sadded to %s's inventory.")
				:format(stackstring, partiality, receiver)
	end
end

core.register_chatcommand("give", {
	params = "<name> <ItemString>",
	description = "give item to player",
	privs = {give=true},
	func = function(name, param)
		local toname, itemstring = string.match(param, "^([^ ]+) +(.+)$")
		if not toname or not itemstring then
			return false, "Name and ItemString required"
		end
		return handle_give_command("/give", name, toname, itemstring)
	end,
})

core.register_chatcommand("giveme", {
	params = "<ItemString>",
	description = "give item to yourself",
	privs = {give=true},
	func = function(name, param)
		local itemstring = string.match(param, "(.+)$")
		if not itemstring then
			return false, "ItemString required"
		end
		return handle_give_command("/giveme", name, name, itemstring)
	end,
})

core.register_chatcommand("spawnentity", {
	params = "<EntityName>",
	description = "Spawn entity at your position",
	privs = {give=true, interact=true},
	func = function(name, param)
		local entityname = string.match(param, "(.+)$")
		if not entityname then
			return false, "EntityName required"
		end
		core.log("action", ("/spawnentity invoked, entityname=%q")
				:format(entityname))
		local player = core.get_player_by_name(name)
		if player == nil then
			core.log("error", "Unable to spawn entity, player is nil")
			return false, "Unable to spawn entity, player is nil"
		end
		local p = player:getpos()
		p.y = p.y + 1
		core.add_entity(p, entityname)
		return true, ("%q spawned."):format(entityname)
	end,
})

core.register_chatcommand("pulverize", {
	params = "",
	description = "Destroy item in hand",
	func = function(name, param)
		local player = core.get_player_by_name(name)
		if not player then
			core.log("error", "Unable to pulverize, no player.")
			return false, "Unable to pulverize, no player."
		end
		if player:get_wielded_item():is_empty() then
			return false, "Unable to pulverize, no item in hand."
		end
		player:set_wielded_item(nil)
		return true, "An item was pulverized."
	end,
})

-- Key = player name
core.rollback_punch_callbacks = {}

core.register_on_punchnode(function(pos, node, puncher)
	local name = puncher:get_player_name()
	if core.rollback_punch_callbacks[name] then
		core.rollback_punch_callbacks[name](pos, node, puncher)
		core.rollback_punch_callbacks[name] = nil
	end
end)

core.register_chatcommand("rollback_check", {
	params = "[<range>] [<seconds>] [limit]",
	description = "Check who has last touched a node or near it,"
			.. " max. <seconds> ago (default range=0,"
			.. " seconds=86400=24h, limit=5)",
	privs = {rollback=true},
	func = function(name, param)
		local range, seconds, limit =
			param:match("(%d+) *(%d*) *(%d*)")
		range = tonumber(range) or 0
		seconds = tonumber(seconds) or 86400
		limit = tonumber(limit) or 5
		if limit > 100 then
			return false, "That limit is too high!"
		end

		core.rollback_punch_callbacks[name] = function(pos, node, puncher)
			local name = puncher:get_player_name()
			core.chat_send_player(name, "Checking " .. core.pos_to_string(pos) .. "...")
			local actions = core.rollback_get_node_actions(pos, range, seconds, limit)
			local num_actions = #actions
			if num_actions == 0 then
				core.chat_send_player(name, "Nobody has touched"
						.. " the specified location in "
						.. seconds .. " seconds")
				return
			end
			local time = os.time()
			for i = num_actions, 1, -1 do
				local action = actions[i]
				core.chat_send_player(name,
					("%s %s %s -> %s %d seconds ago.")
						:format(
							core.pos_to_string(action.pos),
							action.actor,
							action.oldnode.name,
							action.newnode.name,
							time - action.time))
			end
		end

		return true, "Punch a node (range=" .. range .. ", seconds="
				.. seconds .. "s, limit=" .. limit .. ")"
	end,
})

core.register_chatcommand("rollback", {
	params = "<player name> [<seconds>] | :<actor> [<seconds>]",
	description = "revert actions of a player; default for <seconds> is 60",
	privs = {rollback=true},
	func = function(name, param)
		local target_name, seconds = string.match(param, ":([^ ]+) *(%d*)")
		if not target_name then
			local player_name = nil
			player_name, seconds = string.match(param, "([^ ]+) *(%d*)")
			if not player_name then
				return false, "Invalid parameters. See /help rollback"
						.. " and /help rollback_check."
			end
			target_name = "player:"..player_name
		end
		seconds = tonumber(seconds) or 60
		core.chat_send_player(name, "Reverting actions of "
				.. target_name .. " since "
				.. seconds .. " seconds.")
		local success, log = core.rollback_revert_actions_by(
				target_name, seconds)
		local response = ""
		if #log > 100 then
			response = "(log is too long to show)\n"
		else
			for _, line in pairs(log) do
				response = response .. line .. "\n"
			end
		end
		response = response .. "Reverting actions "
				.. (success and "succeeded." or "FAILED.")
		return success, response
	end,
})

core.register_chatcommand("status", {
	description = "Print server status",
	func = function(name, param)
		return true, core.get_server_status()
	end,
})

core.register_chatcommand("time", {
	params = "<0...24000>",
	description = "set time of day",
	privs = {settime=true},
	func = function(name, param)
		if param == "" then
			return false, "Missing time."
		end
		local newtime = tonumber(param)
		if newtime == nil then
			return false, "Invalid time."
		end
		core.set_timeofday((newtime % 24000) / 24000)
		core.log("action", name .. " sets time " .. newtime)
		return true, "Time of day changed."
	end,
})

core.register_chatcommand("shutdown", {
	description = "shutdown server",
	privs = {server=true},
	func = function(name, param)
		core.log("action", name .. " shuts down server")
		core.request_shutdown()
		core.chat_send_all("*** Server shutting down (operator request).")
	end,
})

core.register_chatcommand("ban", {
	params = "<name>",
	description = "Ban IP of player",
	privs = {ban=true},
	func = function(name, param)
		if param == "" then
			return true, "Ban list: " .. core.get_ban_list()
		end
		if not core.get_player_by_name(param) then
			return false, "No such player."
		end
		if not core.ban_player(param) then
			return false, "Failed to ban player."
		end
		local desc = core.get_ban_description(param)
		core.log("action", name .. " bans " .. desc .. ".")
		return true, "Banned " .. desc .. "."
	end,
})

core.register_chatcommand("unban", {
	params = "<name/ip>",
	description = "remove IP ban",
	privs = {ban=true},
	func = function(name, param)
		if not core.unban_player_or_ip(param) then
			return false, "Failed to unban player/IP."
		end
		core.log("action", name .. " unbans " .. param)
		return true, "Unbanned " .. param
	end,
})

core.register_chatcommand("kick", {
	params = "<name> [reason]",
	description = "kick a player",
	privs = {kick=true},
	func = function(name, param)
		local tokick, reason = param:match("([^ ]+) (.+)")
		tokick = tokick or param
		if not core.kick_player(tokick, reason) then
			return false, "Failed to kick player " .. tokick
		end
		core.log("action", name .. " kicked " .. tokick)
		return true, "Kicked " .. tokick
	end,
})

core.register_chatcommand("clearobjects", {
	description = "clear all objects in world",
	privs = {server=true},
	func = function(name, param)
		core.log("action", name .. " clears all objects.")
		core.chat_send_all("Clearing all objects.  This may take long."
				.. "  You may experience a timeout.  (by "
				.. name .. ")")
		core.clear_objects()
		core.log("action", "Object clearing done.")
		core.chat_send_all("*** Cleared all objects.")
	end,
})

core.register_chatcommand("msg", {
	params = "<name> <message>",
	description = "Send a private message",
	privs = {shout=true},
	func = function(name, param)
		local sendto, message = param:match("^(%S+)%s(.+)$")
		if not sendto then
			return false, "Invalid usage, see /help msg."
		end
		if not core.get_player_by_name(sendto) then
			return false, "The player " .. sendto
					.. " is not online."
		end
		core.log("action", "PM from " .. name .. " to " .. sendto
				.. ": " .. message)
		core.chat_send_player(sendto, "PM from " .. name .. ": "
				.. message)
		return true, "Message sent."
	end,
})