#!/bin/bash

# This script processes short and long command
# line arguments.  This is similar in function
# to getopt and getopts but I am trying to make it
# more flexible and usable since neither one
# is a great solution for my purposes atleast.

### PROBLEMS ###

## - Too much repetition is required.  The programming is forced to
## define the corresponding short and long arguments in two places.
## This is a waste of time and increases the chances of bugs.
## This *MUST* be fixed.
## Tuesday December 12th 7:57 PM 
## --fatsheep

until [ "$1" = "" ] ; do

	if [ "${1:0:1}" = "-" ] ; then

		if [ "${1:1:1}" = "-" ] ; then

			##################################
			### Processing Long Arguments ####
			##################################

			case "${1:2}" in
				help ) 
					helpflag="1";;
				verbose ) 
					verbose="1";;
				info ) 
					infoflag="1";;
				test ) 
					testflag="1";;	
				f ) 
					filename="1"
					shift
					file="$1";;
				* ) # This case applies to all undefined long arguments.
					echo "Error: undefined argument: ${1}"
					errorflag="1";;	
			esac


		else
			##################################
			### Processing Short Arguments ###
			##################################

			nu="1"
			arglength="${#1}"

			until [ "$nu" -eq "$arglength" ] ; do
				case "${1:${nu}:1}" in
					h )
						helpflag="1";;
					v )
						verbose="1";;
					i )
						infoflag="1";;	
					t )	
						testflag="1";;	
					f )
						filename="1"
						shift
						file="$1";;
					* ) # This case applies to all undefined short arguments.
						echo "Error: undefined argument: -${1:${nu}:1}"
						errorflag="1";;
				esac
				nu="$((nu + 1))"
			done
		fi

	else
		echo "Error: undefined argument: ${1}" # catches all arguments not preceeded with '-'
		errorflag="1"
	fi
	shift
done 

if [ "$errorflag" = "1" ] ; then
	echo "Argument Syntax Error: Exiting..."
	exit 1
fi

if [ "$filename" = "1" ] && [ "$file" = "" ] ; then
	echo "Error: No file specified!"
	exit 1
fi

if [ "$helpflag" = "1" ] ; then
	if [ "$verbose" = "1" ] ; then
		echo 'Display Help Verbosely!'
	else
		echo 'Display Help!'
	fi
fi

if [ "$infoflag" = "1" ] ; then
	if [ "$verbose" = "1" ] ; then
		echo 'Display Info Verbosely!'
	else
		echo 'Display Info!'
	fi
fi

if [ "$testflag" = "1" ] ; then
	if [ "$verbose" = "1" ] ; then
		echo 'Test Verbosely!'
	else
		echo 'Test!'
	fi
fi

if [ "$filename" = "1" ] ; then
	echo "Filename: $file"
fi