admin/revdiff

   1 #! /usr/bin/perl
   2
   3 # Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006  Free Software
   4 #   Foundation, Inc.
   5 #
   6 # This file is part of GNU Emacs.
   7 #
   8 # GNU Emacs is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 2, or (at your option)
  11 # any later version.
  12 #
  13 # GNU Emacs is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with GNU Emacs; see the file COPYING.  If not, write to the
  20 # Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  21 # Boston, MA 02110-1301, USA.
  22
  23 use File::Basename;
  24
  25 if (@ARGV < 3)
  26 {
  27   print <<USAGE;
  28 revdiff FILE OLD NEW
  29
  30 Get a diff of FILE between revisions OLD and NEW.  Store the
  31 diff in a file named FILE-OLD-NEW.diff.
  32
  33 If OLD is `-' use FILE's current revision for OLD.  If OLD is
  34 `-<number>', use the Nth revision before the current one for OLD.
  35
  36 If NEW is +<number> or -<number>, build diffs between revisions OLD
  37 and OLD +/- <number>.
  38
  39 Examples:
  40
  41 revdiff FILE - -1      get the latest change of FILE
  42 revdiff FILE -1 +1     also gets the latest change of FILE
  43 revdiff FILE 1.500 +2  get diffs 1.500-1.501 and 1.501-1.502.
  44
  45 USAGE
  46   exit 1;
  47 }
  48
  49 $file = shift @ARGV;
  50 $old  = shift @ARGV;
  51
  52 sub diffit
  53 {
  54   my ($old, $new) = @_;
  55   print "cvs diff -r$old -r$new $file >$file-$old-$new.diff\n";
  56   system "cvs diff -r$old -r$new $file >$file-$old-$new.diff";
  57 }
  58
  59 sub current_revision ($)
  60 {
  61   my ($file) = @_;
  62   my $dir = dirname ($file);
  63   my $base = basename ($file);
  64   my $entries = "$dir/CVS/Entries";
  65   die "Can't find $entries" unless -f $entries;
  66   open (IN, "<$entries") or die "Cannot open $entries";
  67   my $rev;
  68   while ($line = <IN>)
  69     {
  70       if ($line =~ m,/$base/([^/]+),)
  71         {
  72           $rev = $1;
  73           break;
  74         }
  75     }
  76   die "Cannot determine current revision of $file" unless $rev;
  77   close (IN);
  78   return $rev;
  79 }
  80
  81 if ($old eq "-")
  82   {
  83     $old = current_revision ($file);
  84   }
  85 elsif ($old =~ /^-(\d+)$/)
  86   {
  87     my $offset = $1;
  88     $old = current_revision ($file);
  89     die "Internal error" unless $old =~ /(.*)\.(\d+)$/;
  90     my $minor = $2 - $offset;
  91     $old = sprintf ("%d.%d", $1, $minor);
  92   }
  93
  94 while (@ARGV)
  95   {
  96     my $new = shift @ARGV;
  97     if ($new =~ /^[+]\d+$/)
  98       {
  99         my $n = $new;
 100         for ($i = 0; $i < $n; ++$i)
 101           {
 102             unless ($old =~ /(.*)\.(\d+)$/)
 103               {
 104                 die "Internal error";
 105               }
 106             my $j = $2 + 1;
 107             $new = "$1.$j";
 108             diffit ($old, $new);
 109             $old = $new;
 110           }
 111       }
 112     elsif ($new =~ /^[-]\d+$/)
 113       {
 114         my $n = - $new;
 115         for ($i = 0; $i < $n; ++$i)
 116           {
 117             unless ($old =~ /(.*)\.(\d+)$/)
 118               {
 119                 die "Internal error";
 120               }
 121             my $j = $2 - 1;
 122             $new = "$1.$j";
 123             diffit ($new, $old);
 124             $old = $new;
 125           }
 126       }
 127     else
 128       {
 129         diffit ($old, $new);
 130         $old = $new;
 131       }
 132   }
 133
 134 # Local Variables:
 135 # mode: cperl
 136 # End:
 137
 138 # arch-tag: 2798b20d-c7f2-4c78-8378-7bb529c36a09