#!/bin/bash
#
#  svnemptydir.sh - helper app for listing empty directories in svn
#  Copyright (C) 2008  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.

x1=`mktemp` x2=`mktemp` x3=`mktemp` x4=`mktemp` x5=`mktemp`
trap 'rm -f $x1 $x2 $x3 $x4 $x5' 0

svn st --no-ignore "$@" | grep '^[?ID]' | cut -c8- | sed 's,^ *,,' > $x1
find "$@" \! -wholename '*/.svn/*' \! -wholename '*/.svn' -type f | sed 's,^./,,' > $x2
find "$@" \! -wholename '*/.svn/*' \! -wholename '*/.svn' -type d | sed 's,^./,,' > $x3

svn_ignore_del_merge()
{
	gawk '
		function add(filename)
		{
			testfn = filename "/";
			while (gsub("/[^/]*$", "", testfn)) {
				if (ignore[testfn])
					return;
			}
			files[filename] = 1;
		}
		ARGIND == 1 { ignore[$0] = 1; }
		ARGIND == 2 { sub("/*$", ""); add($0); }
		END { for (f in files) print f; }
	' $1 $2 | sort
}

svn_ignore_del_merge $x1 $x2 > $x4
svn_ignore_del_merge $x1 $x3 > $x5

gawk '
	BEGIN {
		dir_used["."] = 1;
	}
	ARGIND == 1 {
		n = split($0, dir_elements, "/");
		current_dir = dir_elements[1];
		for (i=1; i<n; i++) {
			dir_used[current_dir] = 1;
			current_dir = current_dir "/" dir_elements[i+1];
		}
	}
	ARGIND == 2 {
		if (!dir_used[$0])
			print;
	}
' $x4 $x5