#! /bin/bash

usage () {
	[ "$1" = 0 ] || exec >&2
	echo "Usage: $0 [--apply] [--keep-old] [--prefix PREFIX] SOURCE LANG"
	exit "$1"
}

die_getopt () {
	echo "getopt failed" >&2
	exit 1
}

APPLY=false
KEEP_OLD=false
PREFIX=
eval set -- "$(getopt -o '' -l apply,keep-old,prefix:,help -- "$@")" || die_getopt
while :; do
	case $1 in
		--apply)
			APPLY=:
			shift
			;;
		--keep-old)
			KEEP_OLD=:
			shift
			;;
		--prefix)
			PREFIX="${2%-}-"
			shift 2
			;;
		--help)
			usage 0
			shift
			;;
		--)	shift; break ;;
		*)	die_getopt ;;
	esac
done

[ "$1" ] || usage 1

SOURCE="$1"
shift

MY_LANG="$1"
case $MY_LANG in
	pa_IN)
		ROSETTA_LANG=pa
		;;
	*)
		ROSETTA_LANG="$MY_LANG"
		;;
esac

[ -e $SOURCE/$PREFIX$ROSETTA_LANG.po ] || exit
msgmerge -q -N <(msgconv -t UTF-8 $SOURCE/$PREFIX$ROSETTA_LANG.po | msgattrib --no-obsolete -) *.pot | msgattrib --no-obsolete $MSGATTRIB_OPTS - | \
	if [ -e $MY_LANG.po ]; then
		if $KEEP_OLD; then
			msgmerge -q -N <(msgconv -t UTF-8 $MY_LANG.po | msgattrib --no-obsolete -) *.pot -C -
		else
			msgmerge -q -N - <(msgconv -t UTF-8 $MY_LANG.po | msgattrib --no-obsolete -)
		fi | \
		msgattrib --no-obsolete -
	else
		cat
	fi | \
	if $APPLY; then
		sponge $MY_LANG.po
	else
		diff -u --label $MY_LANG.po <(msgconv -t UTF-8 $MY_LANG.po) -
	fi