259 lines
6.9 KiB
Perl
259 lines
6.9 KiB
Perl
use Config;
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use File::Basename qw(&basename &dirname);
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use File::Spec;
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use Cwd;
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my $origdir = cwd;
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chdir dirname($0);
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my $file = basename($0, '.PL');
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$file =~ s!_(pm)$!.$1!i;
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my $useConfig;
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my $Config_archname;
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my $Config_version;
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my $Config_inc_version_list;
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# Expand the variables only if explicitly requested because
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# otherwise relocating Perl becomes much harder.
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if (%ENV{PERL_BUILD_EXPAND_CONFIG_VARS}) {
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$useConfig = '';
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$Config_archname = qq('%Config{archname}');
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$Config_version = qq('%Config{version}');
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my @Config_inc_version_list =
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reverse split m/ /, %Config{inc_version_list};
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$Config_inc_version_list =
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@Config_inc_version_list ?
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qq(@Config_inc_version_list) : q(());
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} else {
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$useConfig = 'use Config;';
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$Config_archname = q(%Config{archname});
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$Config_version = q(%Config{version});
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$Config_inc_version_list =
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q(reverse split m/ /, %Config{inc_version_list});
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}
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open my $out,">", "$file" or die "Can't create $file: $!";
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print "Extracting $file (with variable substitutions)\n";
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# In this section, perl variables will be expanded during extraction.
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# You can use %Config{...} to use Configure variables.
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print $out <<"!GROK!THIS!";
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package lib;
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# THIS FILE IS AUTOMATICALLY GENERATED FROM lib_pm.PL.
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# ANY CHANGES TO THIS FILE WILL BE OVERWRITTEN BY THE NEXT PERL BUILD.
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$useConfig
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use strict;
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my \$archname = $Config_archname;
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my \$version = $Config_version;
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my \@inc_version_list = $Config_inc_version_list;
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!GROK!THIS!
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print $out <<'!NO!SUBS!';
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our @ORIG_INC = @INC; # take a handy copy of 'original' value
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our $VERSION = '0.5565';
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my $Is_MacOS = $^O eq 'MacOS';
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my $Mac_FS;
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if ($Is_MacOS) {
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require File::Spec;
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$Mac_FS = eval { require Mac::FileSpec::Unixish };
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}
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sub import {
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shift;
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my %names;
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foreach (reverse @_) {
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my $path = $_; # we'll be modifying it, so break the alias
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if ($path eq '') {
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require Carp;
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Carp::carp("Empty compile time value given to use lib");
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}
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$path = _nativize($path);
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if (-e $path && ! -d _) {
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require Carp;
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Carp::carp("Parameter to use lib must be directory, not file");
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}
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unshift(@INC, $path);
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# Add any previous version directories we found at configure time
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foreach my $incver (@inc_version_list)
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{
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my $dir = $Is_MacOS
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? File::Spec->catdir( $path, $incver )
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: "$path/$incver";
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unshift(@INC, $dir) if -d $dir;
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}
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# Put a corresponding archlib directory in front of $path if it
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# looks like $path has an archlib directory below it.
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my($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir)
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= _get_dirs($path);
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unshift(@INC, $arch_dir) if -d $arch_auto_dir;
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unshift(@INC, $version_dir) if -d $version_dir;
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unshift(@INC, $version_arch_dir) if -d $version_arch_dir;
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}
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# remove trailing duplicates
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@INC = grep { ++%names{$_} == 1 } @INC;
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return;
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}
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sub unimport {
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shift;
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my %names;
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foreach (@_) {
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my $path = _nativize($_);
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my($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir)
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= _get_dirs($path);
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++%names{$path};
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++%names{$arch_dir} if -d $arch_auto_dir;
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++%names{$version_dir} if -d $version_dir;
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++%names{$version_arch_dir} if -d $version_arch_dir;
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}
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# Remove ALL instances of each named directory.
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@INC = grep { !exists %names{$_} } @INC;
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return;
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}
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sub _get_dirs {
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my($dir) = @_;
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my($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir);
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# we could use this for all platforms in the future, but leave it
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# Mac-only for now, until there is more time for testing it.
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if ($Is_MacOS) {
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$arch_auto_dir = File::Spec->catdir( $dir, $archname, 'auto' );
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$arch_dir = File::Spec->catdir( $dir, $archname, );
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$version_dir = File::Spec->catdir( $dir, $version );
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$version_arch_dir = File::Spec->catdir( $dir, $version, $archname );
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} else {
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$arch_auto_dir = "$dir/$archname/auto";
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$arch_dir = "$dir/$archname";
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$version_dir = "$dir/$version";
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$version_arch_dir = "$dir/$version/$archname";
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}
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return($arch_auto_dir, $arch_dir, $version_dir, $version_arch_dir);
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}
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sub _nativize {
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my($dir) = @_;
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if ($Is_MacOS && $Mac_FS && ! -d $dir) {
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$dir = Mac::FileSpec::Unixish::nativize($dir);
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$dir .= ":" unless $dir =~ m/:$/;
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}
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return $dir;
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}
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1;
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__END__
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=head1 NAME
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lib - manipulate @INC at compile time
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=head1 SYNOPSIS
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use lib LIST;
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no lib LIST;
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=head1 DESCRIPTION
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This is a small simple module which simplifies the manipulation of @INC
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at compile time.
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It is typically used to add extra directories to perl's search path so
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that later C<use> or C<require> statements will find modules which are
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not located on perl's default search path.
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=head2 Adding directories to @INC
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The parameters to C<use lib> are added to the start of the perl search
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path. Saying
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use lib LIST;
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is I<almost> the same as saying
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BEGIN { unshift(@INC, LIST) }
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For each directory in LIST (called $dir here) the lib module also
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checks to see if a directory called $dir/$archname/auto exists.
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If so the $dir/$archname directory is assumed to be a corresponding
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architecture specific directory and is added to @INC in front of $dir.
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The current value of C<$archname> can be found with this command:
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perl -V:archname
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To avoid memory leaks, all trailing duplicate entries in @INC are
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removed.
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=head2 Deleting directories from @INC
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You should normally only add directories to @INC. If you need to
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delete directories from @INC take care to only delete those which you
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added yourself or which you are certain are not needed by other modules
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in your script. Other modules may have added directories which they
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need for correct operation.
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The C<no lib> statement deletes all instances of each named directory
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from @INC.
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For each directory in LIST (called $dir here) the lib module also
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checks to see if a directory called $dir/$archname/auto exists.
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If so the $dir/$archname directory is assumed to be a corresponding
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architecture specific directory and is also deleted from @INC.
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=head2 Restoring original @INC
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When the lib module is first loaded it records the current value of @INC
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in an array C<@lib::ORIG_INC>. To restore @INC to that value you
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can say
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@INC = @lib::ORIG_INC;
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=head1 CAVEATS
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In order to keep lib.pm small and simple, it only works with Unix
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filepaths. This doesn't mean it only works on Unix, but non-Unix
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users must first translate their file paths to Unix conventions.
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# VMS users wanting to put [.stuff.moo] into
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# their @INC would write
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use lib 'stuff/moo';
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=head1 NOTES
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In the future, this module will likely use File::Spec for determining
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paths, as it does now for Mac OS (where Unix-style or Mac-style paths
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work, and Unix-style paths are converted properly to Mac-style paths
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before being added to @INC).
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=head1 SEE ALSO
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FindBin - optional module which deals with paths relative to the source file.
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=head1 AUTHOR
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Tim Bunce, 2nd June 1995.
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=cut
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!NO!SUBS!
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close $out or die "Can't close $file: $!";
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chdir $origdir;
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