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/usr/bin/svnlastchange is in kdesdk-scripts 4:4.13.0-0ubuntu1.

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The actual contents of the file can be viewed below.

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#!/usr/bin/env perl
#
# This file is Copyright (C) 2005 Thiago Macieira <thiago@kde.org>
# 
# This program 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; version 2 of the License as published
# by the Free Software Foundation.
#
# This program 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 this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.

# =====================================================================
# This is a replacement for the old svnlastchange script, with a bit
# more of functionality.
#
# The old one was:
# svn log -r COMMITTED "$*"
# svn diff -r PREV:COMMITTED "$*" || \
#     echo >&2 "Error retrieving diff: the file was probably added in the last revision"
#
# =====================================================================

# Turn on warnings the best way depending on the Perl version.
BEGIN {
  if ( $] >= 5.006_000)
    { require warnings; import warnings; }
  else
    { $^W = 1; }
}
use strict;

my $want_whitespace = 0;

sub showdiff($@) #depends on global var $want_whitespace
{
    my ($revisions) = shift(@_);
    my (@files) = @_;
    if ($want_whitespace) {
        system('svn', 'diff',
               # This is for people who set a diff-cmd to exclude whitespace; when forwardporting we need the indentation to be preserved
               '--diff-cmd=diff',
               '-r', $revisions, @files);
    } else {
        # By default, use plain svn diff; whitespace depends on user configuration
        system('svn', 'diff', '-r', $revisions, @files);
    }
}

#
# Read the parameters
#
my @files;
my $rev;
my $special = 0;
my $onlyrev = 0;
my $onlylog = 0;
while (@ARGV)
  {
    my $arg = shift @ARGV;
    if ($arg eq '-h')
      {
        &usage;
        exit 0;
      }
    elsif ($arg =~ /^-r(.*)$/)
      {
        $rev = $1;
        if (length($1) == 0)
	  {
	    $rev = shift @ARGV;
	  }
        $special = 1 if ($rev =~ /^-/);
      }
    elsif ($arg eq '-R')
      {
	$onlyrev = 1;
	$special = 1;
	$rev = -1 unless $rev;
      }
    elsif ($arg eq '-l')
      {
	$onlylog = 1;
      }
    elsif ($arg eq '-ws')
      {
	$want_whitespace = 1;
      }
    else
      {
	push(@files, $arg);
      }
  }
@files = ('.') unless @files;

if (!$special)
  {
    my $prev;
    if ($rev)
      {
	$prev = $rev - 1;
      }
    else
      {
	$rev = 'COMMITTED';
	$prev = 'PREV';
      }

    system('svn', 'log', '-r', $rev, @files);
    &showdiff("$prev:$rev", @files) unless $onlylog;
    exit $?;
  }

#
# Special operation
# Retrieve the full log in order to find the right version
#
foreach my $file (@files)
  {
    my $pid = open(LOG, '-|');
    die "svnlastchange: cannot fork: $!\n" unless (defined $pid);
    unless ($pid)
      {
	open(STDERR, ">&STDOUT")
	  or die "svnlastchange: cannot dup STDOUT: $!\n";
	exec('svn', 'log', $file)
	  or die "svnlastchange: cannot exec svn: $!\n";
      }
      
    my $is_header = 0;
    while (<LOG>)
      {
	s/[\r\n]+$//;
	
	if ($is_header && /^r(\d+) \| /)
	  {
	    $rev = $rev + 1;
	    if ($rev == 0)
	      {
		if ($onlyrev)
		  {
		    print "$1\n";
		  }
		else
		  {
		    system('svn', 'log', '-r', $1, $file);
		    &showdiff( ($1 - 1) . ":$1", $file) unless $onlylog;
		  }
		last;
	      }
	  }
	
	if ($_ eq '------------------------------------------------------------------------')
	  {
	    $is_header = 1;
	  }
	else
	  {
	    $is_header = 0;
	  }
      }
    close(LOG);
    exit $? if $?;
  }

sub usage
{
    print "svnlastchange [-hlR] [-r rev] [filename...]\n";
    print "\n";
    print "Where:\n";
    print "  -h       shows this help screen\n";
    print "  -l       shows the commit log only\n";
    print "  -R       prints the revision number only (to be used with -r)\n";
    print "  -r rev   shows the commit log for revision 'rev'\n";
    print "           if rev is negative, the 'rev'nth revision before the current\n";
    print "           one is shown\n";
    print "\n";
    print "Examples:\n";
    print "  svnlastchange .               shows the last change to the current directory\n";
    print "  svnlastchange -r -2           shows the change before the last\n";
    print "  svnlastchange -R -r -1        shows the last change's revision\n";

    exit 0;
}