1 

     2 local help = { ["desc"] = "Display the available commands" }

     3 

     4 function help.cmd (args)

     5     local r = ""

     6 

     7     local function pairsByKeys (t, f)

     8         local a = {}

     9         for n in pairs(t) do table.insert(a, n) end

    10         table.sort(a, f)

    11         local i = 0      -- iterator variable

    12         local iter = function ()   -- iterator function

    13             i = i + 1

    14             if a[i] == nil then return nil

    15             else return a[i], t[a[i]]

    16             end

    17         end

    18         return iter

    19     end

    20 

    21     for name, obj in pairsByKeys(mcbot_get_command_list()) do

    22         if not obj.hidden then

    23             r = r .. string.format("%s\t%s\n", name, obj.desc or "")

    24         end

    25     end

    26 

    27     r = r:gsub("\n+$", "")

    28     return r

    29 end

    30 

    31 mcbot_register_command("help", help)