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#! /usr/bin/perl
# Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007
# Free Software Foundation, Inc.
#
# This file is part of GNU Emacs.
#
# GNU Emacs is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 3, or (at your option)
# any later version.
#
# GNU Emacs is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with GNU Emacs; see the file COPYING. If not, write to the
# Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301, USA.
use File::Basename;
if (@ARGV < 3)
{
print <<USAGE;
revdiff FILE OLD NEW
Get a diff of FILE between revisions OLD and NEW. Store the
diff in a file named FILE-OLD-NEW.diff.
If OLD is `-' use FILE's current revision for OLD. If OLD is
`-<number>', use the Nth revision before the current one for OLD.
If NEW is +<number> or -<number>, build diffs between revisions OLD
and OLD +/- <number>.
Examples:
revdiff FILE - -1 get the latest change of FILE
revdiff FILE -1 +1 also gets the latest change of FILE
revdiff FILE 1.500 +2 get diffs 1.500-1.501 and 1.501-1.502.
USAGE
exit 1;
}
$file = shift @ARGV;
$old = shift @ARGV;
sub diffit
{
my ($old, $new) = @_;
print "cvs diff -r$old -r$new $file >$file-$old-$new.diff\n";
system "cvs diff -r$old -r$new $file >$file-$old-$new.diff";
}
sub current_revision ($)
{
my ($file) = @_;
my $dir = dirname ($file);
my $base = basename ($file);
my $entries = "$dir/CVS/Entries";
die "Can't find $entries" unless -f $entries;
open (IN, "<$entries") or die "Cannot open $entries";
my $rev;
while ($line = <IN>)
{
if ($line =~ m,/$base/([^/]+),)
{
$rev = $1;
break;
}
}
die "Cannot determine current revision of $file" unless $rev;
close (IN);
return $rev;
}
if ($old eq "-")
{
$old = current_revision ($file);
}
elsif ($old =~ /^-(\d+)$/)
{
my $offset = $1;
$old = current_revision ($file);
die "Internal error" unless $old =~ /(.*)\.(\d+)$/;
my $minor = $2 - $offset;
$old = sprintf ("%d.%d", $1, $minor);
}
while (@ARGV)
{
my $new = shift @ARGV;
if ($new =~ /^[+]\d+$/)
{
my $n = $new;
for ($i = 0; $i < $n; ++$i)
{
unless ($old =~ /(.*)\.(\d+)$/)
{
die "Internal error";
}
my $j = $2 + 1;
$new = "$1.$j";
diffit ($old, $new);
$old = $new;
}
}
elsif ($new =~ /^[-]\d+$/)
{
my $n = - $new;
for ($i = 0; $i < $n; ++$i)
{
unless ($old =~ /(.*)\.(\d+)$/)
{
die "Internal error";
}
my $j = $2 - 1;
$new = "$1.$j";
diffit ($new, $old);
$old = $new;
}
}
else
{
diffit ($old, $new);
$old = $new;
}
}
# Local Variables:
# mode: cperl
# End:
# arch-tag: 2798b20d-c7f2-4c78-8378-7bb529c36a09
|
