build/unix/abs2rel.pl

   1 #!env perl
   2
   3 # ***** BEGIN LICENSE BLOCK *****
   4 # Version: MPL 1.1/GPL 2.0/LGPL 2.1
   5 #
   6 # The contents of this file are subject to the Mozilla Public License Version
   7 # 1.1 (the "License"); you may not use this file except in compliance with
   8 # the License. You may obtain a copy of the License at
   9 # http://www.mozilla.org/MPL/
  10 #
  11 # Software distributed under the License is distributed on an "AS IS" basis,
  12 # WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
  13 # for the specific language governing rights and limitations under the
  14 # License.
  15 #
  16 # The Original Code is mozilla.org Code.
  17 #
  18 # The Initial Developer of the Original Code is
  19 # Netscape Communications Corporation.
  20 # Portions created by the Initial Developer are Copyright (C) 2002
  21 # the Initial Developer. All Rights Reserved.
  22 #
  23 # Contributor(s):
  24 #
  25 # Alternatively, the contents of this file may be used under the terms of
  26 # either of the GNU General Public License Version 2 or later (the "GPL"),
  27 # or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
  28 # in which case the provisions of the GPL or the LGPL are applicable instead
  29 # of those above. If you wish to allow use of your version of this file only
  30 # under the terms of either the GPL or the LGPL, and not to allow others to
  31 # use your version of this file under the terms of the MPL, indicate your
  32 # decision by deleting the provisions above and replace them with the notice
  33 # and other provisions required by the GPL or the LGPL. If you do not delete
  34 # the provisions above, a recipient may use your version of this file under
  35 # the terms of any one of the MPL, the GPL or the LGPL.
  36 #
  37 # ***** END LICENSE BLOCK *****
  38
  39 use File::Spec::Unix;
  40 use strict;
  41
  42 print "Usage: $0 dest_path start_path\n" if ($#ARGV+1 != 2);
  43 my $finish = my_canonpath(shift);
  44 my $start = my_canonpath(shift);
  45
  46 my $res = File::Spec::Unix->abs2rel($finish, $start);
  47
  48 #print STDERR "abs2rel($finish,$start) = $res\n";
  49 print "$res\n";
  50
  51 sub my_canonpath($) {
  52     my ($file) = @_;
  53     my (@inlist, @outlist, $dir);
  54
  55     # Do what File::Spec::Unix->no_upwards should do
  56     my @inlist = split(/\//, File::Spec::Unix->canonpath($file));
  57     foreach $dir (@inlist) {
  58         if ($dir eq '..') {
  59             pop @outlist;
  60         } else {
  61             push @outlist, $dir;
  62         }
  63     }
  64     $file = join '/',@outlist;
  65     return $file;
  66 }
  67