From c3c025c034155d246d66f3ae2f19a1c2caa2d5b0 Mon Sep 17 00:00:00 2001
From: expwnent <null@nowhere.com>
Date: Mon, 30 Jun 2014 02:19:50 -0400
Subject: [PATCH] Added Lua subroutine for standardized argument processing.

---
 library/lua/utils.lua | 59 ++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 58 insertions(+), 1 deletion(-)

diff --git a/library/lua/utils.lua b/library/lua/utils.lua
index be139633e..0c9541cb4 100644
--- a/library/lua/utils.lua
+++ b/library/lua/utils.lua
@@ -548,4 +548,61 @@ function invert(tab)
     return result
 end
 
-return _ENV
\ No newline at end of file
+function processArgs(...)
+    --[[
+    standardized argument processing for scripts
+    -argName value
+    -argName [list of values]
+    -argName [list of [nested values] -that can be [whatever] format of matched square brackets]
+    -arg1 \-arg3
+        escape sequences
+    --]]
+    local result = {}
+    local args = {...}
+    local argName
+    local bracketDepth = 0
+    for i,arg in ipairs(args) do
+        if argName then
+            if arg == '[' then
+                if bracketDepth > 0 then
+                    table.insert(result[argName], arg)
+                end
+                bracketDepth = bracketDepth+1
+            elseif arg == ']' then
+                bracketDepth = bracketDepth-1
+                if bracketDepth > 0 then
+                    table.insert(result[argName], arg)
+                else
+                    argName = nil
+                end
+            elseif string.sub(arg,1,1) == '\\' then
+                if bracketDepth == 0 then
+                    result[argName] = string.sub(arg,2)
+                    argName = nil
+                else
+                    table.insert(result[argName], string.sub(arg,2))
+                end
+            else
+                if bracketDepth == 0 then
+                    result[argName] = arg
+                    argName = nil
+                else
+                    table.insert(result[argName], arg)
+                end
+            end
+        elseif string.sub(arg,1,1) == '-' then
+            argName = string.sub(arg,2)
+            if i+1 > #args or string.sub(args[i+1],1,1) == '-' then
+                result[argName] = ''
+                argName = nil
+            else
+                result[argName] = {}
+            end
+        else
+            error('error parsing arg ' .. i .. ': ' .. arg)
+        end
+    end
+    return result
+end
+
+return _ENV