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136 lines
3.0 KiB
Perl
Executable File
136 lines
3.0 KiB
Perl
Executable File
#! /usr/bin/perl
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# Copyright (C) 2001 Free Software Foundation, Inc.
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#
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# This file is part of GNU Emacs.
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#
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# GNU Emacs is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2, or (at your option)
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# any later version.
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#
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# GNU Emacs is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with GNU Emacs; see the file COPYING. If not, write to the
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# Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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# Boston, MA 02111-1307, USA.
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use File::Basename;
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if (@ARGV < 3)
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{
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print <<USAGE;
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revdiff FILE OLD NEW
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Get a diff of FILE between revisions OLD and NEW. Store the
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diff in a file named FILE-OLD-NEW.diff.
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If OLD is `-' use FILE's current revision for OLD. If OLD is
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`-<number>', use the Nth revision before the current one for OLD.
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If NEW is +<number> or -<number>, build diffs between revisions OLD
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and OLD +/- <number>.
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Examples:
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revdiff FILE - -1 get the latest change of FILE
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revdiff FILE -1 +1 also gets the latest change of FILE
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revdiff FILE 1.500 +2 get diffs 1.500-1.501 and 1.501-1.502.
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USAGE
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exit 1;
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}
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$file = shift @ARGV;
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$old = shift @ARGV;
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sub diffit
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{
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my ($old, $new) = @_;
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print "cvs diff -r$old -r$new $file >$file-$old-$new.diff\n";
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system "cvs diff -r$old -r$new $file >$file-$old-$new.diff";
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}
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sub current_revision ($)
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{
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my ($file) = @_;
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my $dir = dirname ($file);
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my $base = basename ($file);
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my $entries = "$dir/CVS/Entries";
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die "Can't find $entries" unless -f $entries;
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open (IN, "<$entries") or die "Cannot open $entries";
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my $rev;
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while ($line = <IN>)
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{
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if ($line =~ m,/$base/([^/]+),)
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{
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$rev = $1;
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break;
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}
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}
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die "Cannot determine current revision of $file" unless $rev;
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close (IN);
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return $rev;
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}
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if ($old eq "-")
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{
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$old = current_revision ($file);
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}
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elsif ($old =~ /^-(\d+)$/)
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{
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my $offset = $1;
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$old = current_revision ($file);
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die "Internal error" unless $old =~ /(.*)\.(\d+)$/;
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my $minor = $2 - $offset;
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$old = sprintf ("%d.%d", $1, $minor);
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}
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while (@ARGV)
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{
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my $new = shift @ARGV;
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if ($new =~ /^[+]\d+$/)
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{
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my $n = $new;
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for ($i = 0; $i < $n; ++$i)
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{
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unless ($old =~ /(.*)\.(\d+)$/)
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{
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die "Internal error";
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}
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my $j = $2 + 1;
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$new = "$1.$j";
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diffit ($old, $new);
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$old = $new;
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}
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}
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elsif ($new =~ /^[-]\d+$/)
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{
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my $n = - $new;
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for ($i = 0; $i < $n; ++$i)
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{
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unless ($old =~ /(.*)\.(\d+)$/)
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{
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die "Internal error";
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}
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my $j = $2 - 1;
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$new = "$1.$j";
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diffit ($new, $old);
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$old = $new;
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}
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}
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else
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{
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diffit ($old, $new);
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$old = $new;
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}
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}
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# Local Variables:
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# mode: cperl
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# End:
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