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GSAR / perl5.5.650 / lib / FindBin.pm 

            

              
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# FindBin.pm
#
# Copyright (c) 1995 Graham Barr & Nick Ing-Simmons. All rights reserved.
# This program is free software; you can redistribute it and/or modify it
# under the same terms as Perl itself.
=head1 NAME
FindBin - Locate directory of original perl script
=head1 SYNOPSIS
 use FindBin;
 use lib "$FindBin::Bin/../lib";
 or
 use FindBin qw($Bin);
 use lib "$Bin/../lib";
=head1 DESCRIPTION
Locates the full path to the script bin directory to allow the use
of paths relative to the bin directory.
This allows a user to setup a directory tree for some software with
directories E<lt>rootE<gt>/bin and E<lt>rootE<gt>/lib and then the above example will allow
the use of modules in the lib directory without knowing where the software
tree is installed.
If perl is invoked using the B<-e> option or the perl script is read from
C<STDIN> then FindBin sets both C<$Bin> and C<$RealBin> to the current
directory.
=head1 EXPORTABLE VARIABLES
 $Bin         - path to bin directory from where script was invoked
 $Script      - basename of script from which perl was invoked
 $RealBin     - $Bin with all links resolved
 $RealScript  - $Script with all links resolved
=head1 KNOWN BUGS
if perl is invoked as
   perl filename
and I<filename> does not have executable rights and a program called I<filename>
exists in the users C<$ENV{PATH}> which satisfies both B<-x> and B<-T> then FindBin
assumes that it was invoked via the C<$ENV{PATH}>.
Workaround is to invoke perl as
 perl ./filename
=head1 AUTHORS
FindBin is supported as part of the core perl distribution. Please send bug
reports to E<lt>F<perlbug@perl.org>E<gt> using the perlbug program included with perl.
Graham Barr E<lt>F<gbarr@pobox.com>E<gt>
Nick Ing-Simmons E<lt>F<nik@tiuk.ti.com>E<gt>
=head1 COPYRIGHT
Copyright (c) 1995 Graham Barr & Nick Ing-Simmons. All rights reserved.
This program is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=cut
package FindBin;
use Carp;
require 5.000;
require Exporter;
use Cwd qw(getcwd abs_path);
use Config;
use File::Basename;
use File::Spec;
@EXPORT_OK = qw($Bin $Script $RealBin $RealScript $Dir $RealDir);
%EXPORT_TAGS = (ALL => [qw($Bin $Script $RealBin $RealScript $Dir $RealDir)]);
@ISA = qw(Exporter);
$VERSION = "1.42";
BEGIN
{
 *Dir = \$Bin;
 *RealDir = \$RealBin;
 if($0 eq '-e' || $0 eq '-')
  {
   # perl invoked with -e or script is on C<STDIN>
   $Script = $RealScript = $0;
   $Bin    = $RealBin    = getcwd();
  }
 else
  {
   my $script = $0;
   if ($^O eq 'VMS')
    {
     ($Bin,$Script) = VMS::Filespec::rmsexpand($0) =~ /(.*\])(.*)/;
     ($RealBin,$RealScript) = ($Bin,$Script);
    }
   else
    {
     my $IsWin32 = $^O eq 'MSWin32';
     unless(($script =~ m#/# || ($IsWin32 && $script =~ m#\\#))
            && -f $script)
      {
       my $dir;
       foreach $dir (File::Spec->path)
        {
        my $scr = File::Spec->catfile($dir, $script);
        if(-r $scr && (!$IsWin32 || -x _))
         {
          $script = $scr;
          if (-f $0)
           {
            # $script has been found via PATH but perl could have
            # been invoked as 'perl file'. Do a dumb check to see
            # if $script is a perl program, if not then $script = $0
            #
            # well we actually only check that it is an ASCII file
            # we know its executable so it is probably a script
            # of some sort.
            $script = $0 unless(-T $script);
           }
          last;
         }
       }
     }
     croak("Cannot find current script '$0'") unless(-f $script);
     # Ensure $script contains the complete path incase we C<chdir>
     $script = File::Spec->catfile(getcwd(), $script)
       unless File::Spec->file_name_is_absolute($script);
     ($Script,$Bin) = fileparse($script);
     # Resolve $script if it is a link
     while(1)
      {
       my $linktext = readlink($script);
       ($RealScript,$RealBin) = fileparse($script);
       last unless defined $linktext;
       $script = (File::Spec->file_name_is_absolute($linktext))
                  ? $linktext
                  : File::Spec->catfile($RealBin, $linktext);
      }
     # Get absolute paths to directories
     $Bin     = abs_path($Bin)     if($Bin);
     $RealBin = abs_path($RealBin) if($RealBin);
    }
  }
}
1; # Keep require happy