admin/revdiff

   1 #! /usr/bin/perl
   2
   3 # Copyright (C) 2001 Free Software Foundation, Inc.
   4 #
   5 # This file is part of GNU Emacs.
   6 #
   7 # GNU Emacs is free software; you can redistribute it and/or modify
   8 # it under the terms of the GNU General Public License as published by
   9 # the Free Software Foundation; either version 2, or (at your option)
  10 # any later version.
  11 #
  12 # GNU Emacs is distributed in the hope that it will be useful,
  13 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 # GNU General Public License for more details.
  16 #
  17 # You should have received a copy of the GNU General Public License
  18 # along with GNU Emacs; see the file COPYING.  If not, write to the
  19 # Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  20 # Boston, MA 02111-1307, USA.
  21
  22 use File::Basename;
  23
  24 if (@ARGV < 3)
  25 {
  26   print <<USAGE;
  27 revdiff FILE OLD NEW
  28
  29 Get a diff of FILE between revisions OLD and NEW.  Store the
  30 diff in a file named FILE-OLD-NEW.diff.
  31
  32 If OLD is `-' use FILE's current revision for OLD.  If OLD is
  33 `-<number>', use the Nth revision before the current one for OLD.
  34
  35 If NEW is +<number> or -<number>, build diffs between revisions OLD
  36 and OLD +/- <number>.
  37
  38 Examples:
  39
  40 revdiff FILE - -1      get the latest change of FILE
  41 revdiff FILE -1 +1     also gets the latest change of FILE
  42 revdiff FILE 1.500 +2  get diffs 1.500-1.501 and 1.501-1.502.
  43
  44 USAGE
  45   exit 1;
  46 }
  47
  48 $file = shift @ARGV;
  49 $old  = shift @ARGV;
  50
  51 sub diffit
  52 {
  53   my ($old, $new) = @_;
  54   print "cvs diff -r$old -r$new $file >$file-$old-$new.diff\n";
  55   system "cvs diff -r$old -r$new $file >$file-$old-$new.diff";
  56 }
  57
  58 sub current_revision ($)
  59 {
  60   my ($file) = @_;
  61   my $dir = dirname ($file);
  62   my $base = basename ($file);
  63   my $entries = "$dir/CVS/Entries";
  64   die "Can't find $entries" unless -f $entries;
  65   open (IN, "<$entries") or die "Cannot open $entries";
  66   my $rev;
  67   while ($line = <IN>)
  68     {
  69       if ($line =~ m,/$base/([^/]+),)
  70         {
  71           $rev = $1;
  72           break;
  73         }
  74     }
  75   die "Cannot determine current revision of $file" unless $rev;
  76   close (IN);
  77   return $rev;
  78 }
  79
  80 if ($old eq "-")
  81   {
  82     $old = current_revision ($file);
  83   }
  84 elsif ($old =~ /^-(\d+)$/)
  85   {
  86     my $offset = $1;
  87     $old = current_revision ($file);
  88     die "Internal error" unless $old =~ /(.*)\.(\d+)$/;
  89     my $minor = $2 - $offset;
  90     $old = sprintf ("%d.%d", $1, $minor);
  91   }
  92
  93 while (@ARGV)
  94   {
  95     my $new = shift @ARGV;
  96     if ($new =~ /^[+]\d+$/)
  97       {
  98         my $n = $new;
  99         for ($i = 0; $i < $n; ++$i)
 100           {
 101             unless ($old =~ /(.*)\.(\d+)$/)
 102               {
 103                 die "Internal error";
 104               }
 105             my $j = $2 + 1;
 106             $new = "$1.$j";
 107             diffit ($old, $new);
 108             $old = $new;
 109           }
 110       }
 111     elsif ($new =~ /^[-]\d+$/)
 112       {
 113         my $n = - $new;
 114         for ($i = 0; $i < $n; ++$i)
 115           {
 116             unless ($old =~ /(.*)\.(\d+)$/)
 117               {
 118                 die "Internal error";
 119               }
 120             my $j = $2 - 1;
 121             $new = "$1.$j";
 122             diffit ($new, $old);
 123             $old = $new;
 124           }
 125       }
 126     else
 127       {
 128         diffit ($old, $new);
 129         $old = $new;
 130       }
 131   }
 132
 133 # Local Variables:
 134 # mode: cperl
 135 # End: