client/lualibs/getopt.lua

   1
   2 --[[This file is an adaptation from the following source:
   3
   4 https://github.com/attractivechaos/klib/blob/master/lua/klib.lua
   5
   6 ]]
   7
   8 --[[
   9   The MIT License
  10
  11   Copyright (c) 2011, Attractive Chaos <attractor@live.co.uk>
  12
  13   Permission is hereby granted, free of charge, to any person obtaining a copy
  14   of this software and associated documentation files (the "Software"), to deal
  15   in the Software without restriction, including without limitation the rights
  16   to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  17   copies of the Software, and to permit persons to whom the Software is
  18   furnished to do so, subject to the following conditions:
  19
  20   The above copyright notice and this permission notice shall be included in
  21   all copies or substantial portions of the Software.
  22
  23   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  24   IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  25   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  26   AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  27   LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  28   OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  29   SOFTWARE.
  30 ]]--
  31
  32
  33 local function split(txt)
  34   local retval =  {};
  35   for i in string.gmatch(txt, "%S+") do
  36     table.insert(retval,i)
  37   end
  38   return retval
  39 end
  40
  41
  42 -- Description: getopt() translated from the BSD getopt(); compatible with the default Unix getopt()
  43 --[[ Example:
  44   for o, a in os.getopt(arg, 'a:b') do
  45     print(o, a)
  46   end
  47 ]]--
  48
  49 local function getopt(args, ostr)
  50   -- Modification to handle strings instead of tables:
  51   if type(args) == 'string' then
  52     args = split(args)
  53   end
  54
  55   local arg, place = nil, 0;
  56   return function ()
  57     if place == 0 then -- update scanning pointer
  58       place = 1
  59       if #args == 0
  60         or args[1]:sub(1, 1) ~= '-' then
  61         place = 0; return nil end
  62       if #args[1] >= 2 then
  63         place = place + 1
  64         if args[1]:sub(2, 2) == '-' then -- found "--"
  65           place = 0
  66           table.remove(args, 1);
  67           return nil;
  68         end
  69       end
  70     end
  71     local optopt = args[1]:sub(place, place);
  72     place = place + 1;
  73     local oli = ostr:find(optopt);
  74     if optopt == ':' or oli == nil then -- unknown option
  75       if optopt == '-' then return nil end
  76       if place > #args[1] then
  77         table.remove(args, 1);
  78         place = 0;
  79       end
  80       return '?';
  81     end
  82     oli = oli + 1;
  83     if ostr:sub(oli, oli) ~= ':' then -- do not need argument
  84       arg = nil;
  85       if place > #args[1] then
  86         table.remove(args, 1);
  87         place = 0;
  88       end
  89     else -- need an argument
  90       if place <= #args[1] then  -- no white space
  91         arg = args[1]:sub(place);
  92       else
  93         table.remove(args, 1);
  94         if #args == 0 then -- an option requiring argument is the last one
  95            place = 0;
  96            if ostr:sub(1, 1) == ':' then return ':' end
  97           return '?';
  98         else arg = args[1] end
  99         end
 100             table.remove(args, 1);
 101             place = 0;
 102         end
 103     return optopt, arg;
 104   end
 105 end
 106
 107 return { getopt = getopt }