#! /bin/sh

# fetch-po-files -- fetches the .po files from the Translation Project website
# Copyright (C) 2005, 2010 Free Software Foundation, Inc.
#
# 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 <http://www.gnu.org/licenses/>.
#
# Written by James Youngman.

URLBASE="http://www.iro.umontreal.ca/translation/maint"


if [ $# -ne 2 ]; then
	echo "You need to specify the package name and a destination directory on the command line." >&2
	exit 1
fi



PACKAGE="$1"
DESTDIR="$2"
shift

debug () {
	: nothing
}

info () {
	echo "$@"
}


v_update_needed() {
	debug "update_required: Checking $@"
	vnew=$1
	vexisting=$2

	major_new=$(echo $vnew | cut -s -d. -f1)
	major_existing=$(echo $vexisting | cut -s -d. -f1)
	if [ -z "$major_new" ]; then
		debug "New version number empty, update not needed"
		false
	elif [ -z "$major_existing" ]; then
		debug "Existing version number empty, update is needed"
		true
	elif [ $major_new -gt $major_existing ]; then
		debug "$vnew > $vexisting, update needed"
		true
	elif [ $major_new -lt $major_existing ]; then
		debug "$vnew < $vexisting, update NOT needed"
		true
	else
		v_update_needed \
			$(echo $vnew      | cut -s -d. -f2-) \
			$(echo $vexisting | cut -s -d. -f2-)
	fi
}

d_update_needed() {
    # Determine if an update is neeededon the basis of the version numbers.
    cat "$@" |
		tr -d '"' |
		grep "^PO-Revision-Date: " |
		sed -e 's/PO-Revision-Date: //' -e 's/\\n$//' |
		LANG=C sort -c >/dev/null
}



getversion() {
	grep Project-Id-Version: < "$1" |
		tr -d '"' |
		sed -e 's/^.*'$PACKAGE' //' -e 's/\\n$//'
}


check_versions() {
	if vnew=$(getversion "$1"); then
		if vexisting=$(getversion "$2"); then
			if v_update_needed "$vnew" "$vexisting"; then
				true
			else
				d_update_needed "$2" "$1" && \
			        info "Timestamp fields indicate $1 is newer than $2"
			fi
		else
			false
		fi
	else
		false
	fi
}


update_required() {
	new="$1"
	existing="$2"
	# ls -ltrd "$new" "$existing"

	if ! [ -e "$existing" ] ; then
		debug "$existing does not exist, using $new"
		true
	elif cmp $new $existing >/dev/null 2>&1; then
		info "$new and $existing are identical"
		false
	elif check_versions "$new" "$existing"; then
		info "Fetched file has newer version number or date stamp"
		true
	else
		false
	fi
}


possible_update() {

	debug "Possible update of $3/$1"

	new="$2/$1"
	existing="$3/$1"

	if update_required $new $existing; then
		info "Updating $1..."
		rm -f $existing
		mv $new $existing
	else
		rm -f $new
	fi
}



main () {
	potfile=$DESTDIR/$PACKAGE.pot
	if [ -f  $potfile ] ; then
		echo "OK".
	else
		echo "$potfile is not present.  Did you specify the right command line?" >&2
		exit 1
	fi
	tmpdir=`mktemp -d`


	# set -x
	printf "Fetching .po files..."
	wget --quiet --recursive --directory-prefix="$tmpdir" --level=1 --accept "*.po" --no-directories "$URLBASE"/"$PACKAGE"
	echo done
	# cp /tmp/po-updates/$PACKAGE/*.po "$tmpdir"
	# touch "$tmpdir"/*.po

	for f in $(cd $tmpdir && ls *.po ); do
		possible_update "$f" "$tmpdir" "$DESTDIR"
	done
	cd /
	rm -rf "$tmpdir"
}


# getversion gl.po
# update_needed 4.1.5 4.1.5
# update_needed 4.1.15 4.1.5
# update_needed 5.0 4.1.5
# update_needed 4.2.6 5.0
# exit 0

main "$@"