#!/bin/bash
# (c) Nicolás Reynolds <fauno@parabola.nu>
# Released under GPLv3
#
# Performs chroot cleanup smartly, it only removes the unneeded packages or
# leaves you with a cleansystem
#
# See: HOOKPREBUILD

set -e

[ ! -f /etc/libretools.d/cleansystem ] && exit 1
[ ! -d "${DB:-/var/lib/libretools/clean}"/sync ] && exit 1

source $(dirname $0)/libremessages
source /etc/makepkg.conf
source ${HOME}/.makepkg.conf 2>/dev/null|| true

msg "Cleaning chroot..."

cleanup_log=/tmp/libretools-cleanup.log
touch ${cleanup_log}

# If we're running makepkg
if [ -f PKGBUILD ]; then
    source PKGBUILD || true

    check=(${depends[@]} ${makedepends[@]} ${checkdepends[@]})

    if [ ${#check[@]} -ne 0 ]; then

# Update the cleansystem database
        sudo pacman -b "${BD:-/var/lib/libretools/clean}" -Sy
# Get the full list of packages needed by dependencies
        sudo pacman -b "${BD:-/var/lib/libretools/clean}" \
                    -Sp \
                    --print-format "%n" \
                    ${check[@]} \
                    >${cleanup_log}
    fi
fi

# Diff installed packages against a clean chroot and needed packages,
# then remove leftovers
packages=($(comm -23 <(pacman -Qq | sort) \
                     <(cat /etc/libretools.d/cleansystem ${cleanup_log} | sort -u)
         ))

[ ${#packages[@]} -eq 0 ] && exit 0

msg2 "Removing %d packages" ${#packages[@]}

# Only remove leftovers, -Rcs removes too much
sudo pacman --noconfirm -Rn ${packages[@]}

# Cleanup
rm -f ${cleanup_log}

exit $?