symlinks

#!/bin/bash

BASENAME=$(which basename)
ECHO=/bin/echo
FIND=$(which find)
LS=/bin/ls
SED=$(which sed)

progname=$(${BASENAME} $0)

function printusage() {
	${ECHO} "usage: ${progname} { -a | [-bds] } <directory> [ <directory> ... ]" >&2
	exit 1
}

absolute=""
all=""
dangling=""

while getopts abds flag; do
	case $flag in
	s)
		absolute="yes"
		;;
	b|d)
		dangling="yes"
		;;
	a)
		all="yes"
		;;
	?)
		printusage
		;;
	esac
done

shift $(( OPTIND - 1 ))

if [ -z "${all}" -a -z "${absolute}" -a -z "${dangling}" ]
then
	all="yes"
elif [ -n "${all}" ] && [ -n "${absolute}" -o -n "${dangling}" ]
then
	${ECHO} "error: can't use -a with -b, -d or -s" >&2
	printusage
fi

if [ $# -eq 0 ]
then
	${ECHO} "error: must supply at least one directory as an argument" >&2
	printusage
fi

for arg in "$@"
do
	${FIND} ${arg} -type l -print | \
		while read line
	do
		string=$(${LS} -l "${line}")
		destination=$(${ECHO} ${string} | ${SED} -e 's/^.* -> //')
		if [ ! -e "${line}" ]
		then
			if [ -n "${all}" -o -n "${dangling}" ]
			then
				${ECHO} "dangling: ${line} -> ${destination}"
			fi
		# Don't put the glob in quotes or it will be treated
		# as a literal string.
		elif [[ "${destination}" == /* ]]
		then
			if [ -n "${all}" -o -n "${absolute}" ]
			then
				${ECHO} "absolute: ${line} -> ${destination}"
			fi
		else
			if [ -n "${all}" ]
			then
				${ECHO} "${line} -> ${destination}"
			fi
		fi
		
	done
done