Bash Option Parsing

options.sh

#!/bin/bash

# Include this file in the top of your script to have options
# parsed into an OPTIONS variable.
#
# If you set an OPTSTRING variable, getopts will be used with that string
#
# If you set an OPTION_DEBUG variable, then the parsed options will be output

declare -A OPTIONS

if [ -n "$OPTSTRING" ]; then

	# OPTSTRING is set to use getopts

	while getopts "$OPTSTRING" opt; do
		[ -z "$OPTARG" ] && OPTARG=1
		OPTIONS["$opt"]=$OPTARG
	done

else

	# OPTSTRING is not set so manually parse options

	while true; do
		case "$1" in
			--) # option breaker
				shift
				break
				;;
			--*) # long option
				OPTIONS[${1#-}]=1
				shift
				;;
			-*) ## short option(s)
				for (( i=1; i<${#1}; i++ )); do
					opt="${1:$i:1}"

					if [[ $i == $((${#1}-1)) && "$2" != -* && "$3" == -* ]]; then
						# option has value
						OPTIONS["$opt"]=$2
						shift
						shift
						continue 2
					else
						# just a normal option
						if [[ -z "${OPTIONS[$opt]}" || ! "${OPTIONS[$opt]}" =~ ^^[0-9]+$ ]]; then
							# first instance so set to 1
							OPTIONS["$opt"]=1
						else
							# recurring instance so increment
							((OPTIONS["$opt"]++))
						fi
					fi
				done
				shift
				;;
			*) # non option
				break
				;;
		esac
	done

fi

if [ -n "$OPTION_DEBUG" ]; then
	echo -e "\n----- OPTION DEBUG -----"
	for i in "${!OPTIONS[@]}"; do
		echo "$i = ${OPTIONS[$i]}"
	done
	echo "------ PARAMETERS ------"
	for i in  "${@}"; do
		echo "$i"
	done
	echo -e "------------------------\n"
fi