src/gui/guiFormSpecMenu.cpp

-- Minetest: builtin/game/chatcommands.lua

--
-- Chat command handler
--

core.chatcommands = core.registered_chatcommands -- BACKWARDS COMPATIBILITY

core.register_on_chat_message(function(name, message)
	if message:sub(1,1) ~= "/" then
		return
	end

	local cmd, param = string.match(message, "^/([^ ]+) *(.*)")
	if not cmd then
		core.chat_send_player(name, "-!- Empty command")
		return true
	end

	param = param or ""

	local cmd_def = core.registered_chatcommands[cmd]
	if not cmd_def then
		core.chat_send_player(name, "-!- Invalid command: " .. cmd)
		return true
	end
	local has_privs, missing_privs = core.check_player_privs(name, cmd_def.privs)
	if has_privs then
		core.set_last_run_mod(cmd_def.mod_origin)
		local success, message = cmd_def.func(name, param)
		if message then
			core.chat_send_player(name, message)
		end
	else
		core.chat_send_player(name, "You don't have permission"
				.. " to run this command (missing privileges: "
				.. table.concat(missing_privs, ", ") .. ")")
	end
	return true  -- Handled chat message
end)

if core.settings:get_bool("profiler.load") then
	-- Run after register_chatcommand and its register_on_chat_message
	-- Before any chattcommands that should be profiled
	profiler.init_chatcommand()
end

-- Parses a "range" string in the format of "here (number)" or
-- "(x1, y1, z1) (x2, y2, z2)", returning two position vectors
local function parse_range_str(player_name, str)
	local p1, p2
	local args = str:split(" ")

	if args[1] == "here" then
		p1, p2 = core.get_player_radius_area(player_name, tonumber(args[2]))
		if p1 == nil then
			return false, "Unable to get player " .. player_name .. " position"
		end
	else
		p1, p2 = core.string_to_area(str)
		if p1 == nil then
			return false, "Incorrect area format. Expected: (x1,y1,z1) (x2,y2,z2)"
		end
	end

	return p1, p2
end

--
-- Chat commands
--
core.register_chatcommand("me", {
	params = "<action>",
	description = "Display chat action (e.g., '/me orders a pizza' displays"
			.. " '<player name> orders a pizza')",
	privs = {shout=true},
	func = function(name, param)
		core.chat_send_all("* " .. name .. " " .. param)
	end,
})

core.register_chatcommand("admin", {
	description = "Show the name of the server owner",
	func = function(name)
		local admin = minetest.settings:get("name")
		if admin then
			return true, "The administrator of this server is "..admin.."."
		else
			return false, "There's no administrator named in the config file."
		end
	end,
})

core.register_chatcommand("privs", {
	params = "[<name>]",
	description = "Print privileges of player",
	func = function(caller, param)
		param = param:trim()
		local name = (param ~= "" and param or caller)
		return true, "Privileges of " .. name .. ": "
			.. core.privs_to_string(
				core.get_player_privs(name), ' ')
	end,
})

local function handle_grant_command(caller, grantname, grantprivstr)
	local caller_privs = minetest.get_player_privs(caller)
	if not (caller_privs.privs or caller_privs.basic_privs) then
		return false, "Your privileges are insufficient."
	end

	if not core.get_auth_handler().get_auth(grantname) then
		return false, "Player " .. grantname .. " does not exist."
	end
	local grantprivs = core.string_to_privs(grantprivstr)
	if grantprivstr == "all" then
		grantprivs = core.registered_privileges
	end
	local privs = core.get_player_privs(grantname)
	local privs_unknown = ""
	local basic_privs =
		core.string_to_privs(core.settings:get("basic_privs") or "interact,shout")
	for priv, _ in pairs(grantprivs) do
		if not basic_privs[priv] and not caller_privs.privs 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
	for priv, _ in pairs(grantprivs) do
		core.run_priv_callbacks(grantname, priv, caller, "grant")
	end
	core.set_player_privs(grantname, privs)
	core.log("action", caller..' granted ('..core.privs_to_string(grantprivs, ', ')..') privileges to '..grantname)
	if grantname ~= caller then
		core.chat_send_player(grantname, caller
				.. " 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("grant", {
	params = "<name> (<privilege> | all)",
	description = "Give privilege to player",
	func = function(name, param)
		local grantname, grantprivstr = string.match(param, "([^ ]+) (.+)")
		if not grantname or not grantprivstr then
			return false, "Invalid parameters (see /help grant)"
		end
		return handle_grant_command(name, grantname, grantprivstr)
	end,
})

core.register_chatcommand("grantme", {
	params = "<privilege> | all",
	description = "Grant privileges to yourself",
	func = function(name, param)
		if param == "" then
			return false, "Invalid parameters (see /help grantme)"
		end
		return handle_grant_command(name, name, param)
	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.get_auth_handler().get_auth(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)
		local basic_privs =
			core.string_to_privs(core.settings:get("basic_privs") or "interact,shout")
		for priv, _ in pairs(revoke_privs) do
			if not basic_privs[priv] and
					not core.check_player_privs(name, {privs=true}) then
				return false, "Your privileges are insufficient."
			end
		end
		if revoke_priv_str == "all" then
			revoke_privs = privs
			privs = {}
		else
			for priv, _ in pairs(revoke_privs) do
				privs[priv] = nil
			end
		end

		for priv, _ in pairs(revoke_privs) do
			core.run_priv_callbacks(revoke_name, priv, name, "revoke")
		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 player's 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 act_str_past = "?"
		local act_str_pres = "?"
		if not raw_password then
			core.set_player_password(toname, "")
			act_str_past = "cleared"
			act_str_pres = "clears"
		else
			core.set_player_password(toname,
					core.get_password_hash(toname,
							raw_password))
			act_str_past = "set"
			act_str_pres = "sets"
		end
		if toname ~= name then
			core.chat_send_player(toname, "Your password was "
					.. act_str_past .. " by " .. name)
		end

		core.log("action", name .. " " .. act_str_pres
		.. " password of " .. toname .. ".")

		return true, "Password of player \"" .. toname .. "\" " .. act_str_past
	end,
})

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

		core.log("action", name .. " clears password of " .. 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("remove_player", {
	params = "<name>",
	description = "Remove player data",
	privs = {server=true},
	func = function(name, param)
		local toname = param
		if toname == "" then
			return false, "Name field required"
		end

		local rc = core.remove_player(toname)

		if rc == 0 then
			core.log("action", name .. " removed player data of " .. toname .. ".")
			return true, "Player \"" .. toname .. "\" removed."
		elseif rc == 1 then
			return true, "No such player \"" .. toname .. "\" to remove."
		elseif rc == 2 then
			return true, "Player \"" .. toname .. "\" is connected, cannot remove."
		end

		return false, "Unhandled remove_player return code " .. rc .. ""
	end,
})

core.register_chatcommand("teleport", {
	params = "<X>,<Y>,<Z> | <to_name> | (<name> <X>,<Y>,<Z>) | (<name> <to_name>)",
	description = "Teleport to player or 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)
		if p.x and p.y and p.z then
			local lm = 31000
			if p.x < -lm or p.x > lm or p.y < -lm or p.y > lm or p.z < -lm or p.z > lm then
				return false, "Cannot teleport out of map bounds!"
			end
			teleportee = core.get_player_by_name(name)
			if teleportee then
				teleportee:setpos(p)
				return true, "Teleporting to "..core.pos_to_string(p)
			end
		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 not core.check_player_privs(name, {bring=true}) then
			return false, "You don't have permission to teleport other players (missing bring privilege)"
		end

		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

		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.settings:set(setname, setvalue)
			return true, setname .. " = " .. setvalue
		end
		local setname, setvalue = string.match(param, "([^ ]+) (.+)")
		if setname and setvalue then
			if not core.settings:get(setname) then
				return false, "Failed. Use '/set -n <name> <value>' to create a new setting."
			end
			core.settings:set(setname, setvalue)
			return true, setname .. " = " .. setvalue
		end
		local setname = string.match(param, "([^ ]+)")
		if setname then
			local setvalue = core.settings:get(setname)
			if not setvalue then
				setvalue = "<not set>"
			end
			return true, setname .. " = " .. setvalue
		end
		return false, "Invalid parameters (see /help set)."
	end,
})

local function emergeblocks_callback(pos, action, num_calls_remaining, ctx)
	if ctx.total_blocks == 0 then
		ctx.total_blocks   = num_calls_remaining + 1
		ctx.current_blocks = 0
	end
	ctx.current_blocks = ctx.current_blocks + 1

	if ctx.current_blocks == ctx.total_blocks then
		core.chat_send_player(ctx.requestor_name,
			string.format("Finished emerging %d blocks in %.2fms.",
			ctx.total_blocks, (os.clock() - ctx.start_time) * 1000))
	end
end

local function emergeblocks_progress_update(ctx)
	if ctx.current_blocks ~= ctx.total_blocks then
		core.chat_send_player(ctx.requestor_name,
			string.format("emergeblocks update: %d/%d blocks emerged (%.1f%%)",
			ctx.current_blocks, ctx.total_blocks,
			(ctx.current_blocks / ctx.total_blocks) * 100))

		core.after(2, emergeblocks_progress_update, ctx)
	end
end

core.register_chatcommand("emergeblocks", {
	params = "(here [<radius>]) | (<pos1> <pos2>)",
	description = "Load (or, if nonexistent, generate) map blocks "
		.. "contained in area pos1 to pos2 (<pos1> and <pos2> must be in parentheses)",
	privs = {server=true},
	func = function(name, param)
		local p1, p2 = parse_range_str(name, param)
		if p1 == false then
			return false, p2
		end

		local context = {
			current_blocks = 0,
			total_blocks   = 0,
			start_time     = os.clock(),
			requestor_name = name
		}

		core.emerge_area(p1, p2, emergeblocks_callback, context)
		core.after(2, emergeblocks_progress_update, context)

		return true, "Started emerge of area ranging from " ..
			core.pos_to_string(p1, 1) .. " to " .. core.pos_to_string(p2, 1)
	end,
})

core.register_chatcommand("deleteblocks", {
	params = "(here [<radius>]) | (<pos1> <pos2>)",
	description = "Delete map blocks contained in area pos1 to pos2 "
		.. "(<pos1> and <pos2> must be in parentheses)",
	privs = {server=true},
	func = function(name, param)
		local p1, p2 = parse_range_str(name, param)
		if p1 == false then
			return false, p2
		end

		if core.delete_area(p1, p2) then
			return true, "Successfully cleared area ranging from " ..
				core.pos_to_string(p1, 1) .. " to " .. core.pos_to_string(p2, 1)
		else
			return false, "Failed to clear one or more blocks in area"
		end
	end,
})

core.register_chatcommand("fixlight", {
	params = "(here [<radius>]) | (<pos1> <pos2>)",
	description = "Resets lighting in the area between pos1 and pos2 "
		.. "(<pos1> and <pos2> must be in parentheses)",
	privs = {server = true},
	func = function(name, param)
		local p1, p2 = parse_range_str(name, param)
		if p1 == false then
			return false, p2
		end

		if core.fix_light(p1, p2) then
			return true, "Successfully reset light in the area ranging from " ..
				core.pos_to_string(p1, 1) .. " to " .. core.pos_to_string(p2, 1)
		else
			return false, "Failed to load one or more blocks in area"
		end
	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)
	local partiality
	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> [<X>,<Y>,<Z>]",
	description = "Spawn entity at given (or your) position",
	privs = {give=true, interact=true},
	func = function(name, param)
		local entityname, p = string.match(param, "^([^ ]+) *(.*)$")
		if not entityname then
			return false, "EntityName required"
		end
		core.log("action", ("%s invokes /spawnentity, entityname=%q")
				:format(name, 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
		if not minetest.registered_entities[entityname] then
			return false, "Cannot spawn an unknown entity"
		end
		if p == "" then
			p = player:getpos()
		else
			p = core.string_to_pos(p)
			if p == nil then
				return false, "Invalid parameters ('" .. param .. "')"
			end
		end
		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 last touched a node or a node near it"
			.. " within the time specified by <seconds>. Default: range = 0,"
			.. " seconds = 86400 = 24h, limit = 5",
	privs = {rollback=true},
	func = function(name, param)
		if not core.settings:get_bool("enable_rollback_recording") then
			return false, "Rollback functions are disabled."
		end
		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)
			if not actions then
				core.chat_send_player(name, "Rollback functions are disabled")
				return
			end
			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 = "(<name> [<seconds>]) | (:<actor> [<seconds>])",
	description = "Revert actions of a player. Default for <seconds> is 60",
	privs = {rollback=true},
	func = function(name, param)
		if not core.settings:get_bool("enable_rollback_recording") then
			return false, "Rollback functions are disabled."
		end
		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..23>:<0..59> | <0..24000>",
	description = "Set time of day",
	privs = {},
	func = function(name, param)
		if param == "" then
			local current_time = math.floor(core.get_timeofday() * 1440)
			local minutes = current_time % 60
			local hour = (current_time - minutes) / 60
			return true, ("Current time is %d:%02d"):format(hour, minutes)
		end
		local player_privs = core.get_player_privs(name)
		if not player_privs.settime then
			return false, "You don't have permission to run this command " ..
				"(missing privilege: settime)."
		end
		local hour, minute = param:match("^(%d+):(%d+)$")
		if not hour then
			local new_time = tonumber(param)
			if not new_time then
				return false, "Invalid time."
			end
			-- Backward compatibility.
			core.set_timeofday((new_time % 24000) / 24000)
			core.log("action", name .. " sets time to " .. new_time)
			return true, "Time of day changed."
		end
		hour = tonumber(hour)
		minute = tonumber(minute)
		if hour < 0 or hour > 23 then
			return false, "Invalid hour (must be between 0 and 23 inclusive)."
		elseif minute < 0 or minute > 59 then
			return false, "Invalid minute (must be between 0 and 59 inclusive)."
		end
		core.set_timeofday((hour * 60 + minute) / 1440)
		core.log("action", ("%s sets time to %d:%02d"):format(name, hour, minute))
		return true, "Time of day changed."
	end,
})

core.register_chatcommand("days", {
	description = "Display day count",
	func = function(name, param)
		return true, "Current day is " .. core.get_day_count()
	end
})

core.register_chatcommand("shutdown", {
	params = "[<delay_in_seconds> | -1] [reconnect] [<message>]",
	description = "Shutdown server (-1 cancels a delayed shutdown)",
	privs = {server=true},
	func = function(name, param)
		local delay, reconnect, message = param:match("([^ ][-]?[0-9]+)([^ ]+)(.*)")
		message = message or ""

		if delay ~= "" then
			delay = tonumber(param) or 0
		else
			delay = 0
			core.log("action", name .. " shuts down server")
			core.chat_send_all("*** Server shutting down (operator request).")
		end
		core.request_shutdown(message:trim(), core.is_yes(reconnect), delay)
	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_address>",
	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
		local log_reason = ""
		if reason then
			log_reason = " with reason \"" .. reason .. "\""
		end
		core.log("action", name .. " kicks " .. tokick .. log_reason)
		return true, "Kicked " .. tokick
	end,
})

core.register_chatcommand("clearobjects", {
	params = "[full | quick]",
	description = "Clear all objects in world",
	privs = {server=true},
	func = function(name, param)
		local options = {}
		if param == "" or param == "full" then
			options.mode = "full"
		elseif param == "quick" then
			options.mode = "quick"
		else
			return false, "Invalid usage, see /help clearobjects."
		end

		core.log("action", name .. " clears all objects ("
				.. options.mode .. " mode).")
		core.chat_send_all("Clearing all objects.  This may take long."
				.. "  You may experience a timeout.  (by "
				.. name .. ")")
		core.clear_objects(options)
		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,
})

core.register_chatcommand("last-login", {
	params = "[<name>]",
	description = "Get the last login time of a player",
	func = function(name, param)
		if param == "" then
			param = name
		end
		local pauth = core.get_auth_handler().get_auth(param)
		if pauth and pauth.last_login then
			-- Time in UTC, ISO 8601 format
			return true, "Last login time was " ..
				os.date("!%Y-%m-%dT%H:%M:%SZ", pauth.last_login)
		end
		return false, "Last login time is unknown"
	end,
})

core.register_chatcommand("clearinv", {
	params = "[<name>]",
	description = "Clear the inventory of yourself or another player",
	func = function(name, param)
		local player
		if param and param ~= "" and param ~= name then
			if not core.check_player_privs(name, {server=true}) then
				return false, "You don't have permission"
						.. " to run this command (missing privilege: server)"
			end
			player = core.get_player_by_name(param)
			core.chat_send_player(param, name.." cleared your inventory.")
		else
			player = core.get_player_by_name(name)
		end

		if player then
			player:get_inventory():set_list("main", {})
			player:get_inventory():set_list("craft", {})
			player:get_inventory():set_list("craftpreview", {})
			core.log("action", name.." clears "..player:get_player_name().."'s inventory")
			return true, "Cleared "..player:get_player_name().."'s inventory."
		else
			return false, "Player must be online to clear inventory!"
		end
	end,
})
	Commit message (Collapse)	Author	Age
*	Hide tooltip after ETIE_LEFT_UP (for touch control)	MoNTE48	2020-06-09
\|
*	Always use same default tabheader height (#9319)	Paul Ouellette	2020-05-09
\| \| \| \| \|	Previously the default tabheader height was different when using real coordinates. This resulted in the height of tabs changing when switching tabs in sfinv if some tabs used real coordinates.
*	FormSpec: Add universal style selector `*` (#9718)	v-rob	2020-05-06
\|
*	Add `animated_image` to clickthrough elements (#9724)	v-rob	2020-04-25
\|
*	Simplify how parseElement splits element string (#9726)	Pierre-Yves Rollo	2020-04-25
\|
*	Formspec: allow lists to change size and existence while the formspec is ↵	DS	2020-04-18
\| \| \| \| \|	open (#9700) Fixes #9640.
*	Android: fix formspec input for AArch64 devices (#9685)	Maksim	2020-04-16
\|
*	Add scroll_container formspec element (redo) (#9101)	DS	2020-04-13
\| \| \| \| \| \| \| \| \|	New formspec elements: - `scroll_container[<X>,<Y>;<W>,<H>;<scrollbar name>;<orientation>;<scroll factor>]` - `scroll_container_end[]` Other elements can be embedded in this element. Scrollbar must be placed manually.
*	GUIFormSpecMenu: Add basic element highlighing debug feature (#9423)	SmallJoker	2020-04-12
\| \| \|	Activated using F5
*	Formspecs: Add state-selection to style elements (#9378)	Hugues Ross	2020-04-11
\|
*	Formspec: No spec ID for static text labels	SmallJoker	2020-04-11
\| \| \| \|	Fixes #9634
*	Fix GUI element click-through by changing visibility (#9534)	DS	2020-03-31
\| \| \| \| \|	This adds a vector that holds pointers to elements that should only be visible while being drawn. In the guifsmenu's draw func, all elements in this vector are made visible and invisible again. Apart from there, they are always invisible. (Well they are still visible before the first drawn, does this matter? If yes, it could be fixed easily with some lines of code everywhere.)
*	Fix mouse events sent to wrong GUI elements when dragging	sfan5	2020-03-16
\|
*	Formspecs: Add starting frame to `animated_image` (#9411)	v-rob	2020-03-16
\|
*	guiHyperText: Fix blinky cursor on link hover (#9392)	SmallJoker	2020-03-11
\| \| \| \|	Change legacy size/position calculations to 'textarea'
*	Fix memory leak in GUIHyperText (#9489)	DS	2020-03-10
\|
*	GUIFormSpecMenu: Remove field_close_on_enter warning (#9501)	SmallJoker	2020-03-10
\|
*	Add multiple element selection to `style` and `style_type` (#9380)	v-rob	2020-03-01
\|
*	Refactor Script API's log_deprecated	sfan5	2020-02-23
\|
*	Add animated_image[] formspec element (#9258)	Hugues Ross	2020-02-15
\|
*	Formspec: Create a new class for inventorylists (#9287)	DS	2020-02-01
\|
*	StaticText/EnrichedString: Styling support (#9187)	SmallJoker	2020-01-22
\| \| \| \| \| \| \| \|	* StaticText/EnrichedString: Styling support * Fix tooltip fg/bgcolor * Fix default color for substr(), add unittests
*	Replace stray tab with whitespace in guiFormSpecMenu.cpp (#9317)	ANAND	2020-01-18
\|
*	Make clipping of formspec elements more consistent (#9262)	Hugues Ross	2020-01-16
\|
*	Formspec: change the appeareance of the cursor on fields and co. (#8665)	DS	2020-01-11
\|
*	Formspec: Fix clicking on tooltip-obstructed elements (#9266)	DS	2020-01-04
\|
*	Don't override the FGIMG style property if the image parameter is null	Hugues Ross	2019-12-16
\|
*	GUIFormSpecMenu: Fix legacy sorting using std::stable_sort	SmallJoker	2019-12-14
\|
*	Fix spaces breaking formspec_version[] tag	rubenwardy	2019-12-09
\|
*	Refactor to centralize GUIButton styling/rendering code (#9090)	Hugues Ross	2019-12-09
\|
*	Formspec: make bgcolor element less confusing and allow setting fullscreen ↵	DS	2019-12-08
\| \| \| \|	color (#8996)
*	Add scrollbaroptions FormSpec element (#8530)	v-rob	2019-12-06
\|
*	Formspec: Fix priorities for version < 3 (#9121)	SmallJoker	2019-11-20
\| \| \| \| \| \| \| \|	* Formspec: Fix priorities for version < 3 1) Introduce 'priority' to 'FieldSpec' 2) Sort elements based on 'priority' 3) Assign 'name' to the Item Image Button's image to show tooltips again
*	Formspec: draw order and clipping for all elements (#8740)	DS	2019-11-07
\|
*	Formspec: add hypertext element	Pierre-Yves Rollo	2019-11-03
\|
*	Formspecs: Reset version number on rebuild	SmallJoker	2019-10-20
\|
*	Add more visual feedback for button states (#8916)	Hugues Ross	2019-10-12
\| \| \| \| \| \|	- Add style properties for overriding the the hovered/pressed state - By default, hovered buttons are a lighter version of the base color - By default, pressed buttons are a darker version of the base color - Add hovered bg image support for image buttons (style property)
*	Revert "Fix the bgcolor formspec element (#8716)" (#9018)	SmallJoker	2019-10-06
\| \| \| \|	This reverts commit 1db3d252cff9e8d61fecf1052d7497813851da51. Temporary solution until a compatible solution is found to define both - formspec and fullscreen backgrounds.
*	label[]: Fix broken colors since 2c9edef	SmallJoker	2019-09-29
\|
*	Fix error message caused by adding new parameter to background (#8922)	rubenwardy	2019-09-29
\| \| \|	Adds background9[] element to keep backwards compatibility in formspec prepends.
*	Fix some reference counters (memleak) (#8981)	SmallJoker	2019-09-24
\| \| \| \| \|	Fix some reference counters (memleak) Map::dispatchEvent: Allocation safety using references
*	Fix the bgcolor formspec element (#8716)	DS	2019-09-15
\|
*	Fix formspec version backup in prepends losing data	rubenwardy	2019-09-15
\|
*	Formspecs: Introduce formspec_version to mods	SmallJoker	2019-09-14
\|
*	label[]: Fix cut-off translated text	SmallJoker	2019-09-07
\|
*	Add ItemStack:get_description() to get tooltip (#8847)	Paul Ouellette	2019-08-24
\|
*	Add formspec testing to test mod in minimal	rubenwardy	2019-08-03
\|
*	Add styles to most elements	rubenwardy	2019-08-03
\|
*	Add style[] tag with button support	rubenwardy	2019-08-03
\|
*	Add custom colorable GUIButton implementation	rubenwardy	2019-08-03
\|