#!/bin/bash

# pacsysclean - Sort installed packages by increasing installed size. Useful for system clean-up.

declare -r myname='pacsysclean'
declare -r myver='@PACKAGE_VERSION@'

PACMAN_OPTS=

usage() {
	echo "$myname - Sort installed packages by increasing installed size."
	echo
	echo "Usage: $myname [options]"
	echo
	echo "Options:"
	echo "  -o <options>     Specify custom pacman query options (e.g., dt)"
	echo "  -h, --help       Show this help message and exit"
}

version() {
	printf "%s %s\n" "$myname" "$myver"
	echo 'Copyright (C) 2011 Eric Bélanger <snowmaniscool@gmail.com>'
}


if [ -n "$1" ]; then
	case "$1" in
		-o) PACMAN_OPTS="${2}" ;;
		-h|--help) usage; exit 0 ;;
		-V|--version) version; exit 0 ;;
		*) usage; exit 1 ;;
	esac
fi

IFS=$'\n'
name="^Name.*: (.*)$"
size="^Installed Size.*: (.*) KiB$"

[[ $PACMAN_OPTS && $PACMAN_OPTS != -* ]] && PACMAN_OPTS="-$PACMAN_OPTS"

for line in $(LANG=C pacman -Qi $PACMAN_OPTS); do
	if [[ $line =~ $name ]]; then
		printf "%s\t" ${BASH_REMATCH[1]}
	elif [[ $line =~ $size ]]; then
		printf "%s\n" ${BASH_REMATCH[1]}
	fi
done | sort -g -k2 | awk '
BEGIN {
	split("KiB MiB GiB TiB PiB EiB ZiB YiB", suffix)
}
function format_size(size) {
	count = 1
	while (size + 0 > 1024) {
				 size /= 1024
				 count++
	}
	sizestr = sprintf("%.2f %s", size, suffix[count])
	return sizestr
}
{
	printf("%s\t%s\n", format_size($2), $1);
}'

# vim: set ts=2 sw=2 noet: