script to switch between main and claws

diff --git a/tools/sylpheed-switcher b/tools/sylpheed-switcher
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+++ b/tools/sylpheed-switcher
@@ -0,0 +1,148 @@
+#!/usr/bin/perl
+
+#  * Copyright © 2001 Paul Mangan <claws@thewildbeast.co.uk>
+#  *
+#  * This file 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 2 of the License, or
+#  * (at your option) any later version.
+#  *
+#  * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+#  *
+
+#      Script Name: The Nasnas
+#      Script Version: 0.4
+
+######################################################
+######################################################
+###                                               ###
+###  FOR USAGE INSTRUCTIONS RUN THIS SCRIPT WITH   ###
+###  THE FOLLOWING OPTION:                        ###
+###                                               ###
+###  ./sylpheed-switcher --help                           ###
+###                                               ###
+######################################################
+######################################################
+
+use File::Path;
+use Getopt::Long;
+
+my $sylpheed    = 0;
+my $claws       = 0;
+my $sylphpath   = '';
+my $clawspath   = '';
+my $debug      = 0;
+my $YouWantHelp = 0;
+
+GetOptions("main"         => \$sylpheed,
+           "claws"        => \$claws,
+          "main-path=s"  => \$sylphpath,
+          "claws-path=s" => \$clawspath,
+           "debug"       => \$debug,
+          "help"         => \$YouWantHelp);
+
+chdir; ## use $HOME for the working directory
+
+unless (-e ".sylpheed") {  ## check for the .sylpheed directory
+       print "Your '.sylpheed' directory is missing. This probably means that ";
+        print "you have never run sylpheed before.\n";
+        print "Before running sylpheed-switcher run sylpheed normally at least once.\n";
+        exit;
+}
+
+open (SYLSWIT, "<.sylpheed-switcher"); ## read the config file
+       @conf_file = <SYLSWIT>;
+close SYLSWIT;
+
+if ($sylphpath && $clawspath) {  ## this is the initial set-up part
+## write the config file
+       $PATH_INFO = "$clawspath\n$sylphpath";
+       open (CONFFILE, ">.sylpheed-switcher");
+       print CONFFILE $PATH_INFO;
+       close CONFFILE;
+## it appears that you'd run this script before, but the config file was missing
+       $DIR_CHECK = opendir(CHECKDIR, ".sylpheed-claws");
+       closedir(CHECKDIR);
+       if ($DIR_CHECK == 1) {
+               print "\nNow you can run either the main branch or the claws\n";
+               print "branch by using one of the following options:\n\n";
+               print "./sylpheed-switcher --main\n./sylpheed-switcher --claws\n\n";
+               exit;
+       }
+## copy the directory tree
+       system "cp -R .sylpheed .sylpheed-main";
+       system "cp -R .sylpheed .sylpheed-claws";
+## when setting-up is done print a little message
+       print "\nNow you can run either the main branch or the claws\n";
+       print "branch by using one of the following options:\n\n";
+       print "./sylpheed-switcher --main\n./sylpheed-switcher --claws\n\n";
+       exit;
+}
+## the --help option stuff
+if ($YouWantHelp) {
+       print "\n The SYLPHEED<->CLAWS SWITCHER\n\n";
+       print "If you are running this script for the first time you will need \n";
+       print "to set up the configuration. Here is an example, adjust the paths\n";
+       print "to suit your set-up, but remember you need the full path with the\n";
+       print "executable included:\n";
+       print "./sylpheed-switcher --main-path=/usr/local/bin/sylpheed --claws-path=/usr/bin/sylpheed\n\n";
+       print "When you have done the initial set-up, you run either the main branch\n";
+       print "or the claws branch by using one of the following switches:\n\n";
+       print "./sylpheed-switcher --main\n./sylpheed-switcher --claws\n\n";
+        print "Add --debug to run sylpheed in debug mode\n\n";
+       exit;
+}
+## if the config file doesn't exist...
+if (!@conf_file) {
+       print "Use the following set-up options first, or --help for more info:\n";
+       print "--claws-path=PATH   # path to (and including) the claws sylpheed executable\n";
+       print "--main-path=PATH    # path to (and including) the main sylpheed executable\n";
+       exit;
+}
+## check that the chosen execuatble exists
+## get rid of the old symbolic link, make a new one, and run the required executable
+if ($claws) {
+        chomp $conf_file[0];
+       unless (-e $conf_file[0]) {
+               print "\n$conf_file[0] does not exist\n\n";
+               exit;
+       }
+       rmtree(".sylpheed");
+       symlink(".sylpheed-claws",".sylpheed");
+        if ($debug eq 1) {
+               exec "$conf_file[0] --debug";
+        } else {
+               exec "$conf_file[0]";
+        }
+       exit;
+} elsif ($sylpheed) {
+        chomp $conf_file[1];
+       unless (-e $conf_file[1]) {
+               print "\n$conf_file[1] does not exist\n\n";
+               exit;
+       }
+       rmtree(".sylpheed");
+       symlink(".sylpheed-main",".sylpheed");
+        if ($debug eq 1) {
+               exec "$conf_file[1] --debug";
+        } else {
+               exec "$conf_file[1]";
+        }
+       exit;
+} elsif (!$claws && !$sylpheed && @conf_file) {                ## you've got the config file but haven't said
+       print "\nUse one of the following switches:\n";         ## which version you want to run
+       print " --main          # to run sylpheed main\n";
+       print " --claws # to run sylpheed claws\n";
+       print " --help          # to view the help message\n";
+        print "Optionally, you can also use:\n";
+        print " --debug        # to run in debug mode [optional]\n\n";
+       exit;
+}
+###############################