builtin/game/chatcommands.lua

   1 -- Minetest: builtin/chatcommands.lua
   2
   3 --
   4 -- Chat command handler
   5 --
   6
   7 core.chatcommands = {}
   8 function core.register_chatcommand(cmd, def)
   9         def = def or {}
  10         def.params = def.params or ""
  11         def.description = def.description or ""
  12         def.privs = def.privs or {}
  13         core.chatcommands[cmd] = def
  14 end
  15
  16 core.register_on_chat_message(function(name, message)
  17         local cmd, param = string.match(message, "^/([^ ]+) *(.*)")
  18         if not param then
  19                 param = ""
  20         end
  21         local cmd_def = core.chatcommands[cmd]
  22         if not cmd_def then
  23                 return false
  24         end
  25         local has_privs, missing_privs = core.check_player_privs(name, cmd_def.privs)
  26         if has_privs then
  27                 local success, message = cmd_def.func(name, param)
  28                 if message then
  29                         core.chat_send_player(name, message)
  30                 end
  31         else
  32                 core.chat_send_player(name, "You don't have permission"
  33                                 .. " to run this command (missing privileges: "
  34                                 .. table.concat(missing_privs, ", ") .. ")")
  35         end
  36         return true  -- Handled chat message
  37 end)
  38
  39 --
  40 -- Chat commands
  41 --
  42 core.register_chatcommand("me", {
  43         params = "<action>",
  44         description = "chat action (eg. /me orders a pizza)",
  45         privs = {shout=true},
  46         func = function(name, param)
  47                 core.chat_send_all("* " .. name .. " " .. param)
  48         end,
  49 })
  50
  51 core.register_chatcommand("help", {
  52         privs = {},
  53         params = "[all/privs/<cmd>]",
  54         description = "Get help for commands or list privileges",
  55         func = function(name, param)
  56                 local function format_help_line(cmd, def)
  57                         local msg = "/"..cmd
  58                         if def.params and def.params ~= "" then
  59                                 msg = msg .. " " .. def.params
  60                         end
  61                         if def.description and def.description ~= "" then
  62                                 msg = msg .. ": " .. def.description
  63                         end
  64                         return msg
  65                 end
  66                 if param == "" then
  67                         local msg = ""
  68                         local cmds = {}
  69                         for cmd, def in pairs(core.chatcommands) do
  70                                 if core.check_player_privs(name, def.privs) then
  71                                         table.insert(cmds, cmd)
  72                                 end
  73                         end
  74                         table.sort(cmds)
  75                         return true, "Available commands: " .. table.concat(cmds, " ") .. "\n"
  76                                         .. "Use '/help <cmd>' to get more information,"
  77                                         .. " or '/help all' to list everything."
  78                 elseif param == "all" then
  79                         local cmds = {}
  80                         for cmd, def in pairs(core.chatcommands) do
  81                                 if core.check_player_privs(name, def.privs) then
  82                                         table.insert(cmds, format_help_line(cmd, def))
  83                                 end
  84                         end
  85                         table.sort(cmds)
  86                         return true, "Available commands:\n"..table.concat(cmds, "\n")
  87                 elseif param == "privs" then
  88                         local privs = {}
  89                         for priv, def in pairs(core.registered_privileges) do
  90                                 table.insert(privs, priv .. ": " .. def.description)
  91                         end
  92                         table.sort(privs)
  93                         return true, "Available privileges:\n"..table.concat(privs, "\n")
  94                 else
  95                         local cmd = param
  96                         local def = core.chatcommands[cmd]
  97                         if not def then
  98                                 return false, "Command not available: "..cmd
  99                         else
 100                                 return true, format_help_line(cmd, def)
 101                         end
 102                 end
 103         end,
 104 })
 105
 106 core.register_chatcommand("privs", {
 107         params = "<name>",
 108         description = "print out privileges of player",
 109         func = function(name, param)
 110                 param = (param ~= "" and param or name)
 111                 return true, "Privileges of " .. param .. ": "
 112                         .. core.privs_to_string(
 113                                 core.get_player_privs(param), ' ')
 114         end,
 115 })
 116 core.register_chatcommand("grant", {
 117         params = "<name> <privilege>|all",
 118         description = "Give privilege to player",
 119         func = function(name, param)
 120                 if not core.check_player_privs(name, {privs=true}) and
 121                                 not core.check_player_privs(name, {basic_privs=true}) then
 122                         return false, "Your privileges are insufficient."
 123                 end
 124                 local grantname, grantprivstr = string.match(param, "([^ ]+) (.+)")
 125                 if not grantname or not grantprivstr then
 126                         return false, "Invalid parameters (see /help grant)"
 127                 elseif not core.auth_table[grantname] then
 128                         return false, "Player " .. grantname .. " does not exist."
 129                 end
 130                 local grantprivs = core.string_to_privs(grantprivstr)
 131                 if grantprivstr == "all" then
 132                         grantprivs = core.registered_privileges
 133                 end
 134                 local privs = core.get_player_privs(grantname)
 135                 local privs_unknown = ""
 136                 for priv, _ in pairs(grantprivs) do
 137                         if priv ~= "interact" and priv ~= "shout" and
 138                                         not core.check_player_privs(name, {privs=true}) then
 139                                 return false, "Your privileges are insufficient."
 140                         end
 141                         if not core.registered_privileges[priv] then
 142                                 privs_unknown = privs_unknown .. "Unknown privilege: " .. priv .. "\n"
 143                         end
 144                         privs[priv] = true
 145                 end
 146                 if privs_unknown ~= "" then
 147                         return false, privs_unknown
 148                 end
 149                 core.set_player_privs(grantname, privs)
 150                 core.log("action", name..' granted ('..core.privs_to_string(grantprivs, ', ')..') privileges to '..grantname)
 151                 if grantname ~= name then
 152                         core.chat_send_player(grantname, name
 153                                         .. " granted you privileges: "
 154                                         .. core.privs_to_string(grantprivs, ' '))
 155                 end
 156                 return true, "Privileges of " .. grantname .. ": "
 157                         .. core.privs_to_string(
 158                                 core.get_player_privs(grantname), ' ')
 159         end,
 160 })
 161 core.register_chatcommand("revoke", {
 162         params = "<name> <privilege>|all",
 163         description = "Remove privilege from player",
 164         privs = {},
 165         func = function(name, param)
 166                 if not core.check_player_privs(name, {privs=true}) and
 167                                 not core.check_player_privs(name, {basic_privs=true}) then
 168                         return false, "Your privileges are insufficient."
 169                 end
 170                 local revoke_name, revoke_priv_str = string.match(param, "([^ ]+) (.+)")
 171                 if not revoke_name or not revoke_priv_str then
 172                         return false, "Invalid parameters (see /help revoke)"
 173                 elseif not core.auth_table[revoke_name] then
 174                         return false, "Player " .. revoke_name .. " does not exist."
 175                 end
 176                 local revoke_privs = core.string_to_privs(revoke_priv_str)
 177                 local privs = core.get_player_privs(revoke_name)
 178                 for priv, _ in pairs(revoke_privs) do
 179                         if priv ~= "interact" and priv ~= "shout" and priv ~= "interact_extra" and
 180                                         not core.check_player_privs(name, {privs=true}) then
 181                                 return false, "Your privileges are insufficient."
 182                         end
 183                 end
 184                 if revoke_priv_str == "all" then
 185                         privs = {}
 186                 else
 187                         for priv, _ in pairs(revoke_privs) do
 188                                 privs[priv] = nil
 189                         end
 190                 end
 191                 core.set_player_privs(revoke_name, privs)
 192                 core.log("action", name..' revoked ('
 193                                 ..core.privs_to_string(revoke_privs, ', ')
 194                                 ..') privileges from '..revoke_name)
 195                 if revoke_name ~= name then
 196                         core.chat_send_player(revoke_name, name
 197                                         .. " revoked privileges from you: "
 198                                         .. core.privs_to_string(revoke_privs, ' '))
 199                 end
 200                 return true, "Privileges of " .. revoke_name .. ": "
 201                         .. core.privs_to_string(
 202                                 core.get_player_privs(revoke_name), ' ')
 203         end,
 204 })
 205
 206 core.register_chatcommand("setpassword", {
 207         params = "<name> <password>",
 208         description = "set given password",
 209         privs = {password=true},
 210         func = function(name, param)
 211                 local toname, raw_password = string.match(param, "^([^ ]+) +(.+)$")
 212                 if not toname then
 213                         toname = param:match("^([^ ]+) *$")
 214                         raw_password = nil
 215                 end
 216                 if not toname then
 217                         return false, "Name field required"
 218                 end
 219                 local actstr = "?"
 220                 if not raw_password then
 221                         core.set_player_password(toname, "")
 222                         actstr = "cleared"
 223                 else
 224                         core.set_player_password(toname,
 225                                         core.get_password_hash(toname,
 226                                                         raw_password))
 227                         actstr = "set"
 228                 end
 229                 if toname ~= name then
 230                         core.chat_send_player(toname, "Your password was "
 231                                         .. actstr .. " by " .. name)
 232                 end
 233                 return true, "Password of player \"" .. toname .. "\" " .. actstr
 234         end,
 235 })
 236
 237 core.register_chatcommand("clearpassword", {
 238         params = "<name>",
 239         description = "set empty password",
 240         privs = {password=true},
 241         func = function(name, param)
 242                 toname = param
 243                 if toname == "" then
 244                         return false, "Name field required"
 245                 end
 246                 core.set_player_password(toname, '')
 247                 return true, "Password of player \"" .. toname .. "\" cleared"
 248         end,
 249 })
 250
 251 core.register_chatcommand("auth_reload", {
 252         params = "",
 253         description = "reload authentication data",
 254         privs = {server=true},
 255         func = function(name, param)
 256                 local done = core.auth_reload()
 257                 return done, (done and "Done." or "Failed.")
 258         end,
 259 })
 260
 261 core.register_chatcommand("teleport", {
 262         params = "<X>,<Y>,<Z> | <to_name> | <name> <X>,<Y>,<Z> | <name> <to_name>",
 263         description = "teleport to given position",
 264         privs = {teleport=true},
 265         func = function(name, param)
 266                 -- Returns (pos, true) if found, otherwise (pos, false)
 267                 local function find_free_position_near(pos)
 268                         local tries = {
 269                                 {x=1,y=0,z=0},
 270                                 {x=-1,y=0,z=0},
 271                                 {x=0,y=0,z=1},
 272                                 {x=0,y=0,z=-1},
 273                         }
 274                         for _, d in ipairs(tries) do
 275                                 local p = {x = pos.x+d.x, y = pos.y+d.y, z = pos.z+d.z}
 276                                 local n = core.get_node_or_nil(p)
 277                                 if n and n.name then
 278                                         local def = core.registered_nodes[n.name]
 279                                         if def and not def.walkable then
 280                                                 return p, true
 281                                         end
 282                                 end
 283                         end
 284                         return pos, false
 285                 end
 286
 287                 local teleportee = nil
 288                 local p = {}
 289                 p.x, p.y, p.z = string.match(param, "^([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+)$")
 290                 p.x = tonumber(p.x)
 291                 p.y = tonumber(p.y)
 292                 p.z = tonumber(p.z)
 293                 teleportee = core.get_player_by_name(name)
 294                 if teleportee and p.x and p.y and p.z then
 295                         teleportee:setpos(p)
 296                         return true, "Teleporting to "..core.pos_to_string(p)
 297                 end
 298
 299                 local teleportee = nil
 300                 local p = nil
 301                 local target_name = nil
 302                 target_name = param:match("^([^ ]+)$")
 303                 teleportee = core.get_player_by_name(name)
 304                 if target_name then
 305                         local target = core.get_player_by_name(target_name)
 306                         if target then
 307                                 p = target:getpos()
 308                         end
 309                 end
 310                 if teleportee and p then
 311                         p = find_free_position_near(p)
 312                         teleportee:setpos(p)
 313                         return true, "Teleporting to " .. target_name
 314                                         .. " at "..core.pos_to_string(p)
 315                 end
 316
 317                 if core.check_player_privs(name, {bring=true}) then
 318                         local teleportee = nil
 319                         local p = {}
 320                         local teleportee_name = nil
 321                         teleportee_name, p.x, p.y, p.z = param:match(
 322                                         "^([^ ]+) +([%d.-]+)[, ] *([%d.-]+)[, ] *([%d.-]+)$")
 323                         p.x, p.y, p.z = tonumber(p.x), tonumber(p.y), tonumber(p.z)
 324                         if teleportee_name then
 325                                 teleportee = core.get_player_by_name(teleportee_name)
 326                         end
 327                         if teleportee and p.x and p.y and p.z then
 328                                 teleportee:setpos(p)
 329                                 return true, "Teleporting " .. teleportee_name
 330                                                 .. " to " .. core.pos_to_string(p)
 331                         end
 332
 333                         local teleportee = nil
 334                         local p = nil
 335                         local teleportee_name = nil
 336                         local target_name = nil
 337                         teleportee_name, target_name = string.match(param, "^([^ ]+) +([^ ]+)$")
 338                         if teleportee_name then
 339                                 teleportee = core.get_player_by_name(teleportee_name)
 340                         end
 341                         if target_name then
 342                                 local target = core.get_player_by_name(target_name)
 343                                 if target then
 344                                         p = target:getpos()
 345                                 end
 346                         end
 347                         if teleportee and p then
 348                                 p = find_free_position_near(p)
 349                                 teleportee:setpos(p)
 350                                 return true, "Teleporting " .. teleportee_name
 351                                                 .. " to " .. target_name
 352                                                 .. " at " .. core.pos_to_string(p)
 353                         end
 354                 end
 355
 356                 return false, 'Invalid parameters ("' .. param
 357                                 .. '") or player not found (see /help teleport)'
 358         end,
 359 })
 360
 361 core.register_chatcommand("set", {
 362         params = "[-n] <name> <value> | <name>",
 363         description = "set or read server configuration setting",
 364         privs = {server=true},
 365         func = function(name, param)
 366                 local arg, setname, setvalue = string.match(param, "(-[n]) ([^ ]+) (.+)")
 367                 if arg and arg == "-n" and setname and setvalue then
 368                         core.setting_set(setname, setvalue)
 369                         return true, setname .. " = " .. setvalue
 370                 end
 371                 local setname, setvalue = string.match(param, "([^ ]+) (.+)")
 372                 if setname and setvalue then
 373                         if not core.setting_get(setname) then
 374                                 return false, "Failed. Use '/set -n <name> <value>' to create a new setting."
 375                         end
 376                         core.setting_set(setname, setvalue)
 377                         return true, setname .. " = " .. setvalue
 378                 end
 379                 local setname = string.match(param, "([^ ]+)")
 380                 if setname then
 381                         local setvalue = core.setting_get(setname)
 382                         if not setvalue then
 383                                 setvalue = "<not set>"
 384                         end
 385                         return true, setname .. " = " .. setvalue
 386                 end
 387                 return false, "Invalid parameters (see /help set)."
 388         end,
 389 })
 390
 391 core.register_chatcommand("mods", {
 392         params = "",
 393         description = "List mods installed on the server",
 394         privs = {},
 395         func = function(name, param)
 396                 return true, table.concat(core.get_modnames(), ", ")
 397         end,
 398 })
 399
 400 local function handle_give_command(cmd, giver, receiver, stackstring)
 401         core.log("action", giver .. " invoked " .. cmd
 402                         .. ', stackstring="' .. stackstring .. '"')
 403         local itemstack = ItemStack(stackstring)
 404         if itemstack:is_empty() then
 405                 return false, "Cannot give an empty item"
 406         elseif not itemstack:is_known() then
 407                 return false, "Cannot give an unknown item"
 408         end
 409         local receiverref = core.get_player_by_name(receiver)
 410         if receiverref == nil then
 411                 return false, receiver .. " is not a known player"
 412         end
 413         local leftover = receiverref:get_inventory():add_item("main", itemstack)
 414         if leftover:is_empty() then
 415                 partiality = ""
 416         elseif leftover:get_count() == itemstack:get_count() then
 417                 partiality = "could not be "
 418         else
 419                 partiality = "partially "
 420         end
 421         -- The actual item stack string may be different from what the "giver"
 422         -- entered (e.g. big numbers are always interpreted as 2^16-1).
 423         stackstring = itemstack:to_string()
 424         if giver == receiver then
 425                 return true, ("%q %sadded to inventory.")
 426                                 :format(stackstring, partiality)
 427         else
 428                 core.chat_send_player(receiver, ("%q %sadded to inventory.")
 429                                 :format(stackstring, partiality))
 430                 return true, ("%q %sadded to %s's inventory.")
 431                                 :format(stackstring, partiality, receiver)
 432         end
 433 end
 434
 435 core.register_chatcommand("give", {
 436         params = "<name> <ItemString>",
 437         description = "give item to player",
 438         privs = {give=true},
 439         func = function(name, param)
 440                 local toname, itemstring = string.match(param, "^([^ ]+) +(.+)$")
 441                 if not toname or not itemstring then
 442                         return false, "Name and ItemString required"
 443                 end
 444                 return handle_give_command("/give", name, toname, itemstring)
 445         end,
 446 })
 447
 448 core.register_chatcommand("giveme", {
 449         params = "<ItemString>",
 450         description = "give item to yourself",
 451         privs = {give=true},
 452         func = function(name, param)
 453                 local itemstring = string.match(param, "(.+)$")
 454                 if not itemstring then
 455                         return false, "ItemString required"
 456                 end
 457                 return handle_give_command("/giveme", name, name, itemstring)
 458         end,
 459 })
 460
 461 core.register_chatcommand("spawnentity", {
 462         params = "<EntityName>",
 463         description = "Spawn entity at your position",
 464         privs = {give=true, interact=true},
 465         func = function(name, param)
 466                 local entityname = string.match(param, "(.+)$")
 467                 if not entityname then
 468                         return false, "EntityName required"
 469                 end
 470                 core.log("action", ("/spawnentity invoked, entityname=%q")
 471                                 :format(entityname))
 472                 local player = core.get_player_by_name(name)
 473                 if player == nil then
 474                         core.log("error", "Unable to spawn entity, player is nil")
 475                         return false, "Unable to spawn entity, player is nil"
 476                 end
 477                 local p = player:getpos()
 478                 p.y = p.y + 1
 479                 core.add_entity(p, entityname)
 480                 return true, ("%q spawned."):format(entityname)
 481         end,
 482 })
 483
 484 core.register_chatcommand("pulverize", {
 485         params = "",
 486         description = "Destroy item in hand",
 487         func = function(name, param)
 488                 local player = core.get_player_by_name(name)
 489                 if not player then
 490                         core.log("error", "Unable to pulverize, no player.")
 491                         return false, "Unable to pulverize, no player."
 492                 end
 493                 if player:get_wielded_item():is_empty() then
 494                         return false, "Unable to pulverize, no item in hand."
 495                 end
 496                 player:set_wielded_item(nil)
 497                 return true, "An item was pulverized."
 498         end,
 499 })
 500
 501 -- Key = player name
 502 core.rollback_punch_callbacks = {}
 503
 504 core.register_on_punchnode(function(pos, node, puncher)
 505         local name = puncher:get_player_name()
 506         if core.rollback_punch_callbacks[name] then
 507                 core.rollback_punch_callbacks[name](pos, node, puncher)
 508                 core.rollback_punch_callbacks[name] = nil
 509         end
 510 end)
 511
 512 core.register_chatcommand("rollback_check", {
 513         params = "[<range>] [<seconds>] [limit]",
 514         description = "Check who has last touched a node or near it,"
 515                         .. " max. <seconds> ago (default range=0,"
 516                         .. " seconds=86400=24h, limit=5)",
 517         privs = {rollback=true},
 518         func = function(name, param)
 519                 local range, seconds, limit =
 520                         param:match("(%d+) *(%d*) *(%d*)")
 521                 range = tonumber(range) or 0
 522                 seconds = tonumber(seconds) or 86400
 523                 limit = tonumber(limit) or 5
 524                 if limit > 100 then
 525                         return false, "That limit is too high!"
 526                 end
 527
 528                 core.rollback_punch_callbacks[name] = function(pos, node, puncher)
 529                         local name = puncher:get_player_name()
 530                         core.chat_send_player(name, "Checking " .. core.pos_to_string(pos) .. "...")
 531                         local actions = core.rollback_get_node_actions(pos, range, seconds, limit)
 532                         local num_actions = #actions
 533                         if num_actions == 0 then
 534                                 core.chat_send_player(name, "Nobody has touched"
 535                                                 .. " the specified location in "
 536                                                 .. seconds .. " seconds")
 537                                 return
 538                         end
 539                         local time = os.time()
 540                         for i = num_actions, 1, -1 do
 541                                 local action = actions[i]
 542                                 core.chat_send_player(name,
 543                                         ("%s %s %s -> %s %d seconds ago.")
 544                                                 :format(
 545                                                         core.pos_to_string(action.pos),
 546                                                         action.actor,
 547                                                         action.oldnode.name,
 548                                                         action.newnode.name,
 549                                                         time - action.time))
 550                         end
 551                 end
 552
 553                 return true, "Punch a node (range=" .. range .. ", seconds="
 554                                 .. seconds .. "s, limit=" .. limit .. ")"
 555         end,
 556 })
 557
 558 core.register_chatcommand("rollback", {
 559         params = "<player name> [<seconds>] | :<actor> [<seconds>]",
 560         description = "revert actions of a player; default for <seconds> is 60",
 561         privs = {rollback=true},
 562         func = function(name, param)
 563                 local target_name, seconds = string.match(param, ":([^ ]+) *(%d*)")
 564                 if not target_name then
 565                         local player_name = nil
 566                         player_name, seconds = string.match(param, "([^ ]+) *(%d*)")
 567                         if not player_name then
 568                                 return false, "Invalid parameters. See /help rollback"
 569                                                 .. " and /help rollback_check."
 570                         end
 571                         target_name = "player:"..player_name
 572                 end
 573                 seconds = tonumber(seconds) or 60
 574                 core.chat_send_player(name, "Reverting actions of "
 575                                 .. target_name .. " since "
 576                                 .. seconds .. " seconds.")
 577                 local success, log = core.rollback_revert_actions_by(
 578                                 target_name, seconds)
 579                 local response = ""
 580                 if #log > 100 then
 581                         response = "(log is too long to show)\n"
 582                 else
 583                         for _, line in pairs(log) do
 584                                 response = response .. line .. "\n"
 585                         end
 586                 end
 587                 response = response .. "Reverting actions "
 588                                 .. (success and "succeeded." or "FAILED.")
 589                 return success, response
 590         end,
 591 })
 592
 593 core.register_chatcommand("status", {
 594         description = "Print server status",
 595         func = function(name, param)
 596                 return true, core.get_server_status()
 597         end,
 598 })
 599
 600 core.register_chatcommand("time", {
 601         params = "<0...24000>",
 602         description = "set time of day",
 603         privs = {settime=true},
 604         func = function(name, param)
 605                 if param == "" then
 606                         return false, "Missing time."
 607                 end
 608                 local newtime = tonumber(param)
 609                 if newtime == nil then
 610                         return false, "Invalid time."
 611                 end
 612                 core.set_timeofday((newtime % 24000) / 24000)
 613                 core.log("action", name .. " sets time " .. newtime)
 614                 return true, "Time of day changed."
 615         end,
 616 })
 617
 618 core.register_chatcommand("shutdown", {
 619         description = "shutdown server",
 620         privs = {server=true},
 621         func = function(name, param)
 622                 core.log("action", name .. " shuts down server")
 623                 core.request_shutdown()
 624                 core.chat_send_all("*** Server shutting down (operator request).")
 625         end,
 626 })
 627
 628 core.register_chatcommand("ban", {
 629         params = "<name>",
 630         description = "Ban IP of player",
 631         privs = {ban=true},
 632         func = function(name, param)
 633                 if param == "" then
 634                         return true, "Ban list: " .. core.get_ban_list()
 635                 end
 636                 if not core.get_player_by_name(param) then
 637                         return false, "No such player."
 638                 end
 639                 if not core.ban_player(param) then
 640                         return false, "Failed to ban player."
 641                 end
 642                 local desc = core.get_ban_description(param)
 643                 core.log("action", name .. " bans " .. desc .. ".")
 644                 return true, "Banned " .. desc .. "."
 645         end,
 646 })
 647
 648 core.register_chatcommand("unban", {
 649         params = "<name/ip>",
 650         description = "remove IP ban",
 651         privs = {ban=true},
 652         func = function(name, param)
 653                 if not core.unban_player_or_ip(param) then
 654                         return false, "Failed to unban player/IP."
 655                 end
 656                 core.log("action", name .. " unbans " .. param)
 657                 return true, "Unbanned " .. param
 658         end,
 659 })
 660
 661 core.register_chatcommand("kick", {
 662         params = "<name> [reason]",
 663         description = "kick a player",
 664         privs = {kick=true},
 665         func = function(name, param)
 666                 local tokick, reason = param:match("([^ ]+) (.+)")
 667                 tokick = tokick or param
 668                 if not core.kick_player(tokick, reason) then
 669                         return false, "Failed to kick player " .. tokick
 670                 end
 671                 core.log("action", name .. " kicked " .. tokick)
 672                 return true, "Kicked " .. tokick
 673         end,
 674 })
 675
 676 core.register_chatcommand("clearobjects", {
 677         description = "clear all objects in world",
 678         privs = {server=true},
 679         func = function(name, param)
 680                 core.log("action", name .. " clears all objects.")
 681                 core.chat_send_all("Clearing all objects.  This may take long."
 682                                 .. "  You may experience a timeout.  (by "
 683                                 .. name .. ")")
 684                 core.clear_objects()
 685                 core.log("action", "Object clearing done.")
 686                 core.chat_send_all("*** Cleared all objects.")
 687         end,
 688 })
 689
 690 core.register_chatcommand("msg", {
 691         params = "<name> <message>",
 692         description = "Send a private message",
 693         privs = {shout=true},
 694         func = function(name, param)
 695                 local sendto, message = param:match("^(%S+)%s(.+)$")
 696                 if not sendto then
 697                         return false, "Invalid usage, see /help msg."
 698                 end
 699                 if not core.get_player_by_name(sendto) then
 700                         return false, "The player " .. sendto
 701                                         .. " is not online."
 702                 end
 703                 core.log("action", "PM from " .. name .. " to " .. sendto
 704                                 .. ": " .. message)
 705                 core.chat_send_player(sendto, "PM from " .. name .. ": "
 706                                 .. message)
 707                 return true, "Message sent."
 708         end,
 709 })
 710