-
---[[This file is an adaptation from the following source:
-
-https://github.com/attractivechaos/klib/blob/master/lua/klib.lua
-
-]]
-
---[[
- The MIT License
-
- Copyright (c) 2011, Attractive Chaos <attractor@live.co.uk>
-
- Permission is hereby granted, free of charge, to any person obtaining a copy
- of this software and associated documentation files (the "Software"), to deal
- in the Software without restriction, including without limitation the rights
- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
- copies of the Software, and to permit persons to whom the Software is
- furnished to do so, subject to the following conditions:
-
- The above copyright notice and this permission notice shall be included in
- all copies or substantial portions of the Software.
-
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
- SOFTWARE.
-]]--
-
-
-local function split(txt)
- local retval = {};
- for i in string.gmatch(txt, "%S+") do
- table.insert(retval,i)
- end
- return retval
-end
-
-
--- Description: getopt() translated from the BSD getopt(); compatible with the default Unix getopt()
---[[ Example:
- for o, a in os.getopt(arg, 'a:b') do
- print(o, a)
- end
-]]--
-
-local function getopt(args, ostr)
- -- Modification to handle strings instead of tables:
- if type(args) == 'string' then
- args = split(args)
- end
-
- local arg, place = nil, 0;
- return function ()
- if place == 0 then -- update scanning pointer
- place = 1
- if #args == 0
- or args[1]:sub(1, 1) ~= '-' then
- place = 0; return nil end
- if #args[1] >= 2 then
- place = place + 1
- if args[1]:sub(2, 2) == '-' then -- found "--"
- place = 0
- table.remove(args, 1);
- return nil;
- end
- end
- end
- local optopt = args[1]:sub(place, place);
- place = place + 1;
- local oli = ostr:find(optopt);
- if optopt == ':' or oli == nil then -- unknown option
- if optopt == '-' then return nil end
- if place > #args[1] then
- table.remove(args, 1);
- place = 0;
- end
- return '?';
- end
- oli = oli + 1;
- if ostr:sub(oli, oli) ~= ':' then -- do not need argument
- arg = nil;
- if place > #args[1] then
- table.remove(args, 1);
- place = 0;
- end
- else -- need an argument
- if place <= #args[1] then -- no white space
- arg = args[1]:sub(place);
- else
- table.remove(args, 1);
- if #args == 0 then -- an option requiring argument is the last one
- place = 0;
- if ostr:sub(1, 1) == ':' then return ':' end
- return '?';
- else arg = args[1] end
- end
- table.remove(args, 1);
- place = 0;
- end
- return optopt, arg;
- end
-end
-
-return { getopt = getopt }