Command line options for windows batch

getopts.cmd

@echo off
setlocal enableDelayedExpansion enableExtensions
REM @filename getopts.cmd
REM @link <a href="https://gist.github.com/loopyd">gist.github.com/loopyd</a>
REM @editor loopyd &lt;<a href="mailto:loopyd@lupinedream.com">loopyd@lupinedream.com</a>&gt; LupineDream
REM @author <a href="https://stackoverflow.com/users/1012053/dbenham">dbenham</a>
REM @description Use is always free, with credit! \
REM \
REM You may use this script at your leasure for testing purposes. \
REM \
REM You are not to remove these comments from this file if you so choose to use \
REM my code, please give credit where it is do by abiding by this simple request! \
REM Thank you~!

REM Changelog:
REM    1.0 initial copypasta
REM    1.1 fixed typos
REM    1.2 fix argument shifting

set "options=-username:/ -option2:"" -option3:"three word default" -flag1: -flag2:"

for %%O in (%options%) do for /f "tokens=1,* delims=:" %%A in ("%%O") do set "%%A=%%~B"
:loop
if not "%~1"=="" (
  set "test=!options:*%~1:=! "
  if "!test!"=="!options! " (
      echo. Error: Invalid option %~1
  ) else if "!test:~0,1!"==" " (
      set "%~1=t"
  ) else (
      setlocal disableDelayedExpansion
      set "val=%~2"
      call :escapeVal
      setlocal enableDelayedExpansion
      for /f delims^=^ eol^= %%A in ("!val!") do endlocal&endlocal&set "%~1=%%A" !
	  shift
  )
  shift 
  goto :loop
)
goto :endArgs
:escapeVal
set "val=%val:^=^^%"
set "val=%val:!=^!%"
exit /b
:endArgs

rem just output them for now.
set -