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Diffstat (limited to 'Master/tlpkg/tlperl0/lib/FindBin.pm')
| -rwxr-xr-x | Master/tlpkg/tlperl0/lib/FindBin.pm | 209 |
1 files changed, 209 insertions, 0 deletions
diff --git a/Master/tlpkg/tlperl0/lib/FindBin.pm b/Master/tlpkg/tlperl0/lib/FindBin.pm new file mode 100755 index 00000000000..892d6e5d93a --- /dev/null +++ b/Master/tlpkg/tlperl0/lib/FindBin.pm @@ -0,0 +1,209 @@ +# 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 "$Bin/../lib"; + +=head1 DESCRIPTION + +Locates the full path to the script bin directory to allow the use +of paths relative to the bin directory. + +This allows a user to setup a directory tree for some software with +directories C<< <root>/bin >> and C<< <root>/lib >>, and then the above +example will allow the use of modules in the lib directory without knowing +where the software tree is installed. + +If perl is invoked using the B<-e> option or the perl script is read from +C<STDIN> then FindBin sets both C<$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 ISSUES + +If there are two modules using C<FindBin> from different directories +under the same interpreter, this won't work. Since C<FindBin> uses a +C<BEGIN> block, it'll be executed only once, and only the first caller +will get it right. This is a problem under mod_perl and other persistent +Perl environments, where you shouldn't use this module. Which also means +that you should avoid using C<FindBin> in modules that you plan to put +on CPAN. To make sure that C<FindBin> will work is to call the C<again> +function: + + use FindBin; + FindBin::again(); # or FindBin->again; + +In former versions of FindBin there was no C<again> function. The +workaround was to force the C<BEGIN> block to be executed again: + + delete $INC{'FindBin.pm'}; + require FindBin; + +=head1 KNOWN BUGS + +If perl is invoked as + + perl filename + +and I<filename> does not have executable rights and a program called +I<filename> exists in the users C<$ENV{PATH}> which satisfies both B<-x> +and B<-T> then FindBin assumes that it was invoked via the +C<$ENV{PATH}>. + +Workaround is to invoke perl as + + perl ./filename + +=head1 AUTHORS + +FindBin is supported as part of the core perl distribution. Please send bug +reports to E<lt>F<perlbug@perl.org>E<gt> using the perlbug program +included with perl. + +Graham Barr E<lt>F<gbarr@pobox.com>E<gt> +Nick Ing-Simmons E<lt>F<nik@tiuk.ti.com>E<gt> + +=head1 COPYRIGHT + +Copyright (c) 1995 Graham Barr & Nick Ing-Simmons. All rights reserved. +This program is free software; you can redistribute it and/or modify it +under the same terms as Perl itself. + +=cut + +package FindBin; +use Carp; +require 5.000; +require Exporter; +use Cwd qw(getcwd cwd abs_path); +use File::Basename; +use File::Spec; + +@EXPORT_OK = qw($Bin $Script $RealBin $RealScript $Dir $RealDir); +%EXPORT_TAGS = (ALL => [qw($Bin $Script $RealBin $RealScript $Dir $RealDir)]); +@ISA = qw(Exporter); + +$VERSION = "1.50"; + + +# needed for VMS-specific filename translation +if( $^O eq 'VMS' ) { + require VMS::Filespec; + VMS::Filespec->import; +} + +sub cwd2 { + my $cwd = getcwd(); + # getcwd might fail if it hasn't access to the current directory. + # try harder. + defined $cwd or $cwd = cwd(); + $cwd; +} + +sub init +{ + *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 = cwd2(); + $Bin = VMS::Filespec::unixify($Bin) if $^O eq 'VMS'; + } + else + { + my $script = $0; + + if ($^O eq 'VMS') + { + ($Bin,$Script) = VMS::Filespec::rmsexpand($0) =~ /(.*[\]>\/]+)(.*)/s; + # C<use disk:[dev]/lib> isn't going to work, so unixify first + ($Bin = VMS::Filespec::unixify($Bin)) =~ s/\/\z//; + ($RealBin,$RealScript) = ($Bin,$Script); + } + else + { + my $dosish = ($^O eq 'MSWin32' or $^O eq 'os2'); + unless(($script =~ m#/# || ($dosish && $script =~ m#\\#)) + && -f $script) + { + my $dir; + foreach $dir (File::Spec->path) + { + my $scr = File::Spec->catfile($dir, $script); + + # $script can 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 keep $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. + if(-f $scr && -r _ && ($dosish || -x _) && -s _ && -T _) + { + $script = $scr; + last; + } + } + } + + croak("Cannot find current script '$0'") unless(-f $script); + + # Ensure $script contains the complete path in case we C<chdir> + + $script = File::Spec->catfile(cwd2(), $script) + unless File::Spec->file_name_is_absolute($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, $linktext); + } + + # Get absolute paths to directories + if ($Bin) { + my $BinOld = $Bin; + $Bin = abs_path($Bin); + defined $Bin or $Bin = File::Spec->canonpath($BinOld); + } + $RealBin = abs_path($RealBin) if($RealBin); + } + } +} + +BEGIN { init } + +*again = \&init; + +1; # Keep require happy |