170 lines
4.2 KiB
Perl
170 lines
4.2 KiB
Perl
# 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 = $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
|
|
|