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#!/usr/bin/env bash

# Copyright (C) 2011-2012 Nicolás Reynolds <fauno@parabola.nu>
# Copyright (C) 2012 Michał Masłowski <mtjm@mtjm.eu>
# Copyright (C) 2012 Joshua Ismael Haase Hernández (xihh) <hahj87@gmail.com>
#
# License: GNU GPLv3+
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU Affero General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

. libremessages
. "$(librelib conf.sh)"
load_files libretools
check_vars libretools TORUPATH REPOS || exit 1
load_files abs
check_vars abs ABSROOT || exit 1

setup_traps

TORUPATH=${T:-${TORUPATH}}
VERBOSE=${V:-false}
FORCE=false

# Stores the lastsync date
lastsync() {
	local lastsyncfile="$1"

	if [[ -e "${lastsyncfile}" -a ! -w "${lastsyncfile}" ]]; then
		error "The sync date can't be saved: file not writable: %q" "${lastsyncfile}"
		return 1
	fi

	date +%s > "${lastsyncfile}"
	touch "${lastsyncfile}"
}

# repo paths
get_pkgbuilds() {
	local lastsyncfile="$1"; shift
	# Only find newer than lastsyncfile and read
	# everything else from cache
	local extra=(-newer "${lastsyncfile}")

	if [[ $FORCE = true || ! -e ${lastsyncfile} ]]; then

		${VERBOSE} && warning "Forcing upgrade"
		# Get all PKGBUILDs
		extra=()
	fi

	# Return all PKGBUILDs found
	find "$@" -mindepth 2 -maxdepth 3 -type f -name 'PKGBUILD' "${extra[@]}"
}

if [ ! -w "$TORUPATH" ]; then
	error "Toru's path isn't writable. Please check $TORUPATH"
	exit 1
fi

lastsyncfile=${TORUPATH}/lastsync.paths
pathfile=${TORUPATH}/paths.tch

if [ ! -e "${pathfile}" ]; then
	tcamgr create "${pathfile}"
fi

# TODO pass other paths via flags
# ABSROOT has trailing slash
fullrepos=()
# This loop is complicated because it goes over REPOS backward
for (( i = ${#REPOS[@]}-1 ; i >= 0 ; i-- )); do
	${VERBOSE} && msg "Processing [%s]" "${REPOS[$i]}"

	if [ -d "${ABSROOT}${REPOS[$i]}" ]; then
		fullrepos+=("${ABSROOT}${REPOS[$i]}")
	fi
done
IFS=$'\n'
pkgbuilds=($(get_pkgbuilds "${lastsyncfile}" "${fullrepos[@]}"))

msg "Updating path cache"
msg2 "%d PKGBUILDs to update" ${#pkgbuilds[@]}
for _pkgbuild in "${pkgbuilds[@]}"; do
	# plain "$_pkgbuild"
	if ! load_PKGBUILD "${_pkgbuild}" >/dev/null 2>&1; then
		error "%q contains errors, skipping" "${_pkgbuild}"
		continue
	fi

	fullpath="$(dirname -- "${_pkgbuild}")"

	for _pkg in "${pkgbase}" "${pkgname[@]}" "${provides[@]}"; do
		$VERBOSE && msg2 '%s -> %s' "${_pkg}" "${fullpath}"
		tcamgr put "${pathfile}" "${_pkg%%[<>=]*}" "${fullpath}"
	done
done

lastsync "${lastsyncfile}"