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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;
BEGIN { unshift(@INC,"$FindBin::Bin/../lib") }
or
use FindBin qw($Bin);
BEGIN { unshift(@INC,"$Bin/../lib") }
=head1 DESCRIPTION
Locates the full path to the script bin directory to allow the use
of paths relative to the bin directory.
This allows a user to setup a directory tree for some software with
directories <root>/bin and <root>/lib and then the above example will allow
the use of modules in the lib directory without knowing where the software
tree is installed.
If perl is invoked using the -e option or the perl script is read from
C<STDIN> then FindBin sets both C<$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 -x and -T then FindBin
assumes that it was invoked via the C<$ENV{PATH}>.
Workaround is to invoke perl as
perl ./filename
=head1 AUTHORS
Graham Barr <bodg@tiuk.ti.com>
Nick Ing-Simmons <nik@tiuk.ti.com>
=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.
=head1 REVISION
$Revision: 1.4 $
=cut
package FindBin;
use Carp;
require 5.000;
require Exporter;
use Cwd qw(getcwd);
@EXPORT_OK = qw($Bin $Script $RealBin $RealScript $Dir $RealDir);
%EXPORT_TAGS = (ALL => [qw($Bin $Script $RealBin $RealScript $Dir $RealDir)]);
@ISA = qw(Exporter);
$VERSION = $VERSION = sprintf("%d.%02d", q$Revision: 1.4 $ =~ /(\d+)\.(\d+)/);
# Taken from Cwd.pm It is really getcwd with an optional
# parameter instead of '.'
#
# another way would be:
#
#sub abs_path
#{
# my $cwd = getcwd();
# chdir(shift || '.');
# my $realpath = getcwd();
# chdir($cwd);
# $realpath;
#}
sub abs_path
{
my $start = shift || '.';
my($dotdots, $cwd, @pst, @cst, $dir, @tst);
unless (@cst = stat( $start ))
{
warn "stat($start): $!";
return '';
}
$cwd = '';
$dotdots = $start;
do
{
$dotdots .= '/..';
@pst = @cst;
unless (opendir(PARENT, $dotdots))
{
warn "opendir($dotdots): $!";
return '';
}
unless (@cst = stat($dotdots))
{
warn "stat($dotdots): $!";
closedir(PARENT);
return '';
}
if ($pst[0] == $cst[0] && $pst[1] == $cst[1])
{
$dir = '';
}
else
{
do
{
unless (defined ($dir = readdir(PARENT)))
{
warn "readdir($dotdots): $!";
closedir(PARENT);
return '';
}
$tst[0] = $pst[0]+1 unless (@tst = lstat("$dotdots/$dir"))
}
while ($dir eq '.' || $dir eq '..' || $tst[0] != $pst[0] ||
$tst[1] != $pst[1]);
}
$cwd = "$dir/$cwd";
closedir(PARENT);
} while ($dir);
chop($cwd); # drop the trailing /
$cwd;
}
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
{
unless($script =~ m#/# && -f $script)
{
my $dir;
foreach $dir (split(/:/,$ENV{PATH}))
{
if(-x "$dir/$script")
{
$script = "$dir/$script";
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 = getcwd() . "/" . $script unless($script =~ m,^/,);
($Bin,$Script) = $script =~ m,^(.*?)/+([^/]+)$,;
# Resolve $script if it is a link
while(1)
{
my $linktext = readlink($script);
($RealBin,$RealScript) = $script =~ m,^(.*?)/+([^/]+)$,;
last unless defined $linktext;
$script = ($linktext =~ m,^/,)
? $linktext
: $RealBin . "/" . $linktext;
}
# Get absolute paths to directories
$Bin = abs_path($Bin) if($Bin);
$RealBin = abs_path($RealBin) if($RealBin);
}
}
}
1; # Keep require happy
|
