#!/bin/bash
#
# distclean v0.20 -- lists unneed files in the distfiles directory
# (c) Christian Birchinger <joker@netswarm.net>

option=$1

if [ "$option" = '-h' -o "$option" = '--help' ]; then
	echo
	echo "Usage: `basename $0` [options]"
	echo
	echo "       -h | --help    Display this help"
	echo "       -r | --remove  Remove unneeded files"
	echo
	exit
fi

DCROOT='/var/cache/edb/dep'

# Ugly but faster than multiple portageq commands
eval `emerge --verbose --info | egrep "^(DISTDIR|PORTDIR|PORTDIR_OVERLAY)"`

echo >&2
echo -n ">>> Scanning all portages for used distfiles... " >&2

spin() {
	case "$SPIN" in
		'' ) SPIN='|'; echo -n " ";;
		'|') SPIN='/';;
		'/') SPIN='-';;
		'-') SPIN='\';;
		'\') SPIN='|';;
	esac
	echo -e -n "\e[1D$SPIN" 
}

for x in $(
	( for i in $(find /var/db/pkg -mindepth 2 -maxdepth 2 -printf "%P\n")
	do
		files=""
		for o in ${PORTDIR} ${PORTDIR_OVERLAY}; do
			if [ -r "${DCROOT}/${o}/${i}" ]; then
				files="${files} $(sed -n "s/^SRC_URI=//p" "${DCROOT}/${o}/${i}")"
			elif [ -r "${o}/metadata/cache/${i}" ]; then
				files="${files} $(sed '4q;d' "${o}/metadata/cache/${i}")"
			fi
		done

		for j in ${files}
		do
			if [ "${j/\:\/\/}" != "${j}" ]
			then
				echo "`basename ${j}`"
				spin >&2
			fi
		done
	done | sort -u ; ls -1 ${DISTDIR} ) | sort | uniq -u
	echo -e "\e[1D " >&2
	echo >&2
)

do
	if [ -f "${DISTDIR}/${x}" ]
	then
		if [ "$option" = '-r' -o "$option" = '--remove' ]
		then
			rm -fv ${DISTDIR}/${x}
		else
			echo "${x}"
		fi
	fi
done
echo >&2