worldedit_commands/safe.lua

   1 local safe_region_callback = {}\r
   2 local safe_region_param = {}\r
   3 \r
   4 local function check_region(name, param)\r
   5         local pos1, pos2 = worldedit.pos1[name], worldedit.pos2[name] --obtain positions\r
   6         if pos1 == nil or pos2 == nil then\r
   7                 worldedit.player_notify(name, "no region selected")\r
   8                 return nil\r
   9         end\r
  10         return worldedit.volume(pos1, pos2)\r
  11 end\r
  12 \r
  13 --`callback` is a callback to run when the user confirms\r
  14 --`nodes_needed` is a function accepting `param`, `pos1`, and `pos2` to calculate the number of nodes needed\r
  15 local function safe_region(callback, nodes_needed)\r
  16         --default node volume calculation\r
  17         nodes_needed = nodes_needed or check_region\r
  18 \r
  19         return function(name, param)\r
  20                 --check if the operation applies to a safe number of nodes\r
  21                 local count = nodes_needed(name, param)\r
  22                 if count == nil then return end --invalid command\r
  23                 if count < 10000 then\r
  24                         return callback(name, param)\r
  25                 end\r
  26 \r
  27                 --save callback to call later\r
  28                 safe_region_callback[name], safe_region_param[name] = callback, param\r
  29                 worldedit.player_notify(name, "WARNING: this operation could affect up to " .. count .. " nodes; type //y to continue or //n to cancel")\r
  30         end\r
  31 end\r
  32 \r
  33 local function reset_pending(name)\r
  34         safe_region_callback[name], safe_region_param[name] = nil, nil\r
  35 end\r
  36 \r
  37 minetest.register_chatcommand("/y", {\r
  38         params = "",\r
  39         description = "Confirm a pending operation",\r
  40         func = function(name)\r
  41                 local callback, param = safe_region_callback[name], safe_region_param[name]\r
  42                 if not callback then\r
  43                         worldedit.player_notify(name, "no operation pending")\r
  44                         return\r
  45                 end\r
  46 \r
  47                 safe_region_callback[name], safe_region_param[name] = nil, nil --reset pending operation\r
  48                 callback(name, param)\r
  49         end,\r
  50 })\r
  51 \r
  52 minetest.register_chatcommand("/n", {\r
  53         params = "",\r
  54         description = "Confirm a pending operation",\r
  55         func = function(name)\r
  56                 if not safe_region_callback[name] then\r
  57                         worldedit.player_notify(name, "no operation pending")\r
  58                         return\r
  59                 end\r
  60                 safe_region_callback[name], safe_region_param[name] = nil, nil\r
  61         end,\r
  62 })\r
  63 \r
  64 \r
  65 return safe_region, check_region, reset_pending\r