michael@0: #!env perl
michael@0: 
michael@0: # This Source Code Form is subject to the terms of the Mozilla Public
michael@0: # License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0: # file, You can obtain one at http://mozilla.org/MPL/2.0/.
michael@0: 
michael@0: use File::Spec::Unix;
michael@0: use strict;
michael@0: 
michael@0: print "Usage: $0 dest_path start_path\n" if ($#ARGV+1 != 2);
michael@0: my $finish = my_canonpath(shift);
michael@0: my $start = my_canonpath(shift);
michael@0: 
michael@0: my $res = File::Spec::Unix->abs2rel($finish, $start);
michael@0: 
michael@0: #print STDERR "abs2rel($finish,$start) = $res\n";
michael@0: print "$res\n";
michael@0: 
michael@0: sub my_canonpath($) {
michael@0:     my ($file) = @_;
michael@0:     my (@inlist, @outlist, $dir);
michael@0: 
michael@0:     # Do what File::Spec::Unix->no_upwards should do
michael@0:     my @inlist = split(/\//, File::Spec::Unix->canonpath($file));
michael@0:     foreach $dir (@inlist) {
michael@0: 	if ($dir eq '..') {
michael@0: 	    pop @outlist;
michael@0: 	} else {
michael@0: 	    push @outlist, $dir;
michael@0: 	}
michael@0:     }
michael@0:     $file = join '/',@outlist;
michael@0:     return $file;
michael@0: }
michael@0: