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-- Minetest: builtin/chatcommands.lua

--
-- Chat command handler
--

minetest.chatcommands = {}
function minetest.register_chatcommand(cmd, def)
	def = def or {}
	def.params = def.params or ""
	def.description = def.description or ""
	def.privs = def.privs or {}
	minetest.chatcommands[cmd] = def
end

minetest.register_on_chat_message(function(name, message)
	local cmd, param = string.match(message, "^/([^ ]+) *(.*)")
	if not param then
		param = ""
	end
	local cmd_def = minetest.chatcommands[cmd]
	if cmd_def then
		if not cmd_def.func then
			-- This is a C++ command
			return false
		else
			local has_privs, missing_privs = minetest.check_player_privs(name, cmd_def.privs)
			if has_privs then
				cmd_def.func(name, param)
			else
				minetest.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
	end
	return false
end)

--
-- Chat commands
--

-- Register C++ commands without functions
minetest.register_chatcommand("me", {params = nil, description = "chat action (eg. /me orders a pizza)"})
minetest.register_chatcommand("status", {description = "print server status line"})
minetest.register_chatcommand("shutdown", {params = "", description = "shutdown server", privs = {server=true}})
minetest.register_chatcommand("clearobjects", {params = "", description = "clear all objects in world", privs = {server=true}})
minetest.register_chatcommand("time", {params = "<0...24000>", description = "set time of day", privs = {settime=true}})
minetest.register_chatcommand("ban", {params = "<name>", description = "ban IP of player", privs = {ban=true}})
minetest.register_chatcommand("unban", {params = "<name/ip>", description = "remove IP ban", privs = {ban=true}})

-- Register other commands
minetest.register_chatcommand("help", {
	privs = {},
	params = "(nothing)/all/privs/<cmd>",
	description = "Get help for commands or list privileges",
	func = function(name, param)
		local format_help_line = function(cmd, def)
			local msg = "/"..cmd
			if def.params and def.params ~= "" then msg = msg .. " " .. def.params end
			if def.description and def.description ~= "" then msg = msg .. ": " .. def.description end
			return msg
		end
		if param == "" then
			local msg = ""
			cmds = {}
			for cmd, def in pairs(minetest.chatcommands) do
				if minetest.check_player_privs(name, def.privs) then
					table.insert(cmds, cmd)
				end
			end
			minetest.chat_send_player(name, "Available commands: "..table.concat(cmds, " "))
			minetest.chat_send_player(name, "Use '/help <cmd>' to get more information, or '/help all' to list everything.")
		elseif param == "all" then
			minetest.chat_send_player(name, "Available commands:")
			for cmd, def in pairs(minetest.chatcommands) do
				if minetest.check_player_privs(name, def.privs) then
					minetest.chat_send_player(name, format_help_line(cmd, def))
				end
			end
		elseif param == "privs" then
			minetest.chat_send_player(name, "Available privileges:")
			for priv, def in pairs(minetest.registered_privileges) do
				minetest.chat_send_player(name, priv..": "..def.description)
			end
		else
			local cmd = param
			def = minetest.chatcommands[cmd]
			if not def then
				minetest.chat_send_player(name, "Command not available: "..cmd)
			else
				minetest.chat_send_player(name, format_help_line(cmd, def))
			end
		end
	end,
})
minetest.register_chatcommand("privs", {
	params = "<name>",
	description = "print out privileges of player",
	func = function(name, param)
		if param == "" then
			param = name
		else
			--[[if not minetest.check_player_privs(name, {privs=true}) then
				minetest.chat_send_player(name, "Privileges of "..param.." are hidden from you.")
				return
			end]]
		end
		minetest.chat_send_player(name, "Privileges of "..param..": "..minetest.privs_to_string(minetest.get_player_privs(param), ' '))
	end,
})
minetest.register_chatcommand("grant", {
	params = "<name> <privilege>|all",
	description = "Give privilege to player",
	privs = {},
	func = function(name, param)
		if not minetest.check_player_privs(name, {privs=true}) and 
				not minetest.check_player_privs(name, {basic_privs=true}) then
			minetest.chat_send_player(name, "Your privileges are insufficient.")
			return
		end
		local grantname, grantprivstr = string.match(param, "([^ ]+) (.+)")
		if not grantname or not grantprivstr then
			minetest.chat_send_player(name, "Invalid parameters (see /help grant)")
			return
		end
		local grantprivs = minetest.string_to_privs(grantprivstr)
		if grantprivstr == "all" then
			grantprivs = minetest.registered_privileges
		end
		local privs = minetest.get_player_privs(grantname)
		local privs_known = true
		for priv, _ in pairs(grantprivs) do
			if priv ~= "interact" and priv ~= "shout" and priv ~= "interact_extra" and not minetest.check_player_privs(name, {privs=true}) then
				minetest.chat_send_player(name, "Your privileges are insufficient.")
				return
			end
			if not minetest.registered_privileges[priv] then
				minetest.chat_send_player(name, "Unknown privilege: "..priv)
				privs_known = false
			end
			privs[priv] = true
		end
		if not privs_known then
			return
		end
		minetest.set_player_privs(grantname, privs)
		minetest.chat_send_player(name, "Privileges of "..grantname..": "..minetest.privs_to_string(minetest.get_player_privs(grantname), ' '))
		if grantname ~= name then
			minetest.chat_send_player(grantname, name.." granted you privileges: "..minetest.privs_to_string(grantprivs, ' '))
		end
	end,
})
minetest.register_chatcommand("revoke", {
	params = "<name> <privilege>|all",
	description = "Remove privilege from player",
	privs = {},
	func = function(name, param)
		if not minetest.check_player_privs(name, {privs=true}) and 
				not minetest.check_player_privs(name, {basic_privs=true}) then
			minetest.chat_send_player(name, "Your privileges are insufficient.")
			return
		end
		local revokename, revokeprivstr = string.match(param, "([^ ]+) (.+)")
		if not revokename or not revokeprivstr then
			minetest.chat_send_player(name, "Invalid parameters (see /help revoke)")
			return
		end
		local revokeprivs = minetest.string_to_privs(revokeprivstr)
		local privs = minetest.get_player_privs(revokename)
		for priv, _ in pairs(revokeprivs) do