#!/bin/sh

_printhelp()
{
    cat <<EOF
Usage: ${1##*/} [OPTIONS] PACKAGES

Display size of files in PACKAGES.

  -h:  Display this help.
  -n:  Sort by size.

EOF
}

OPTION_SORT="cat"

while getopts ":hn" opt; do
    case $opt in
        h)
            _printhelp "$0"
            exit 1 ;;
        n)
            OPTION_SORT="sort -h" ;;
        ?)
            _printhelp "$0"
            exit 1 ;;
        :)
            echo "Missing argument."
            _printhelp "$0"
            exit 1 ;;
    esac
done

shift $(($OPTIND - 1))

if [ $# -eq 0 ]; then
    echo "Missing argument."
    _printhelp "$0"
    exit 1
fi

! command -v pacman >/dev/null && echo "You need pacman to run this script." && exit 1
if [ $(pacman -Qq "$@" 2>/dev/null | wc -l) -eq 0 ]; then
    echo "No valid package given." >&2
    exit
fi

## We use "eval" to be compatible with non-POSIX wordsplitting (e.g. zsh).
du -bch $(pacman -Qlq "$@" | grep -v ".*/$" | sort -u) 2>/dev/null | eval ${OPTION_SORT}