#!/bin/sh
#
#  scratchpkg
#
#  Copyright (c) 2018 by Emmett1  (emmett1.2miligrams@gmail.com)
#
#  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 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 <https://www.gnu.org/licenses/>.
#

cmp_copy() {
	# usage:
	#   cmp_copy <source dir> <target dir>
	#
	reponame=${2##*/}
	for p in $1/*; do
		[ -d $p ] || continue
		pname=${p##*/}
		if [ ! -d $2/$pname ]; then
			mkdir -p $2/$pname
			for f in $p/* $p/.pkgfiles $p/.checksums; do
				[ -f $f ] || continue
				case $f in
					*/update) continue;;
				esac
				fname=${f##*/}
				echo "+ $reponame/$pname/$fname"
				cp $f $2/$pname/$fname
			done		
		else
			for f in $p/* $p/.pkgfiles $p/.checksums; do
				[ -f $f ] || continue
				case $f in
					*/update) continue;;
				esac
				fname=${f##*/}
				cmp -s $f $2/$pname/$fname || {
					echo "* $reponame/$pname/$fname"
					cp $f $2/$pname/$fname
				}
			done
		fi
	done
	for p in $2/*; do
		[ -d $p ] || continue
		pname=${p##*/}
		for f in $p/* $p/.pkgfiles $p/.checksums; do
			[ -f $f ] || continue
			fname=${f##*/}
			if [ ! -f $1/$pname/$fname ]; then
				echo "- $reponame/$pname/$fname"
				rm $2/$pname/$fname
			fi
		done
		if [ ! -d $1/$pname ]; then
			rmdir $2/$pname
		fi
	done
}

sync_repo() {
	# usage:
	#   sync_repo <repo url> <ports dir>
	#
	url=$(echo $1 | cut -d / -f -5)
	portdir=$2
	
	case $1 in
		*github.com/*)
			branch=$(echo $1 | cut -d / -f 7)
			repodir=$(echo $1 | cut -d / -f 8-);;
		*gitlab.com/*)
			branch=$(echo $1 | cut -d / -f 8)
			repodir=$(echo $1 | cut -d / -f 9-);;
		*) # will add more git service
			branch=$(echo $1 | cut -d / -f 8)
			repodir=$(echo $1 | cut -d / -f 9-);;
	esac

	# if branch not in the url, assume it master branch
	[ "$branch" ] || branch=master
	
	echo "fetching ports: $1"

	# cloning ports repository
	git clone --depth 1 -q -b $branch $url $tmprepo || {
		echo " failed sync repo"
		exit 1
	}
	
	# copying ports to port directory by comparing
	cmp_copy $tmprepo/$repodir $portdir
	
	# cleanup tmp cloned repo
	rm -fr $tmprepo
	
	echo "ports synced: $2"
}

tmprepo=/tmp/tmprepo
repo_file=/etc/scratchpkg.repo
	
if [ ! -e "$repo_file" ]; then
	echo "missing repo file: $repo_file"
	exit 1
fi

if [ "$(id -u)" != 0 ]; then
	echo "this operation need root access."
	exit 1
fi

grep -Ev '^(#|$)' "$repo_file" | awk '{print $1,$2}' | while read -r repodir repourl; do
	if [ "$repodir" ] && [ "$repourl" ]; then
		sync_repo $repourl $repodir
	fi
done

exit 0