Implemented parameter passing into script, added a minimal getop-parser, added an example script which takes parameters

client/getopt.lua

@@ -0,0 +1,107 @@
+
+--[[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 }