#!/bin/bash
#
#  svnexternals.sh - helper app for managing svn:externals properties
#  Copyright (C) 2010  Clifford Wolf <clifford@clifford.at>
#
#  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 2 of the License, or
#  (at your option) any later version.

tmpfile=$( mktemp $PWD/.svnexternals.XXXXXXXXXX; )
trap 'rm -f "$tmpfile"' 0

freeze() {
	svn pg svn:externals . | grep . |
	while read line; do
		dir=""
		read a b c < <( echo "$line"; )
		[ -d "$a" ] && dir="$a"
		[ -d "$b" ] && dir="$b"
		[ -d "$c" ] && dir="$c"
		if [ "$dir" ]; then
			rev=$( svnversion -c $dir | sed 's,.*:,,; s,[^0-9].*,,;'; )
			url=$( svn info $dir | grep '^URL: ' | cut -f2- -d' '; )
			echo "$dir -r$rev $url"
		else
			echo "$line"
		fi
	done > $tmpfile
	if [ -s $tmpfile ]; then
		svn ps svn:externals "$PWD" -F $tmpfile
	else
		svn pd --quiet svn:externals .
	fi
}

unfreeze() {
	svn pg svn:externals . | grep . |
	while read line; do
		dir=""
		read a b c < <( echo "$line"; )
		[ -d "$a" ] && dir="$a"
		[ -d "$b" ] && dir="$b"
		[ -d "$c" ] && dir="$c"
		if [ "$dir" ]; then
			url=$( svn info $dir | grep '^URL: ' | cut -f2- -d' '; )
			echo "$dir $url"
		else
			echo "$line"
		fi
	done > $tmpfile
	if [ -s $tmpfile ]; then
		svn ps svn:externals "$PWD" -F $tmpfile
	else
		svn pd --quiet svn:externals .
	fi
}

recursive=false
if [ "$1" = "-r" ]; then
	recursive=true
	shift
fi

case "$1" in
	freeze|unfreeze|update)
		cmd="$1"; shift
		if $recursive; then
			[ $# = 0 ] && set -- .
			set -- "$@" $( svn ls -R "$@" | grep '/$'; )
		fi
		if [ $cmd = update ]; then
			if [ $# = 0 ]; then
				unfreeze; svn up; freeze
			else
				for d; do ( cd "$d"; unfreeze; ); done
				svn up "$@"
				for d; do ( cd "$d"; freeze; ); done
			fi
		else
			if [ $# = 0 ]; then
				$cmd
			else
				for d; do ( cd "$d"; $cmd; ); done
			fi
		fi
		;;
	*)
		echo "Usage: $0 [-r] { freeze | unfreeze | update }" >&2
		exit 1
		;;
esac

exit 0