package blib; =head1 NAME blib - Use MakeMaker's uninstalled version of a package =head1 SYNOPSIS perl -Mblib script [args...] perl -Mblib=dir script [args...] =head1 DESCRIPTION Looks for MakeMaker-like I<'blib'> directory structure starting in I<dir> (or current directory) and working back up to five levels of '..'. Intended for use on command line with B<-M> option as a way of testing arbitrary scripts against an uninstalled version of a package. However it is possible to : use blib; or use blib '..'; etc. if you really must. =head1 BUGS Pollutes global name space for development only task. =head1 AUTHOR Nick Ing-Simmons nik@tiuk.ti.com =cut use Cwd; use File::Spec; our $VERSION = '1.07'; our $Verbose = 0; sub import { my $package = shift; my $dir; if ($^O eq "MSWin32" && -f "Win32.xs") { # We don't use getcwd() on Windows because it will internally # call Win32::GetCwd(), which will get the Win32 module loaded. # That means that it would not be possible to run `make test` # for the Win32 module because blib.pm would always load the # installed version before @INC gets updated with the blib path. chomp($dir = `cd`); } else { $dir = getcwd; } if ($^O eq 'VMS') { ($dir = VMS::Filespec::unixify($dir)) =~ s-/\z--; } if (@_) { $dir = shift; $dir =~ s/blib\z//; $dir =~ s,/+\z,,; $dir = File::Spec->curdir unless ($dir); die "$dir is not a directory\n" unless (-d $dir); } # detaint: if the user asked for blib, s/he presumably knew # what s/he wanted $dir = $1 if $dir =~ /^(.*)$/; my $i = 5; my($blib, $blib_lib, $blib_arch); while ($i--) { $blib = File::Spec->catdir($dir, "blib"); $blib_lib = File::Spec->catdir($blib, "lib"); $blib_arch = File::Spec->catdir($blib, "arch"); if (-d $blib && -d $blib_arch && -d $blib_lib) { unshift(@INC,$blib_arch,$blib_lib); warn "Using $blib\n" if $Verbose; return; } $dir = File::Spec->catdir($dir, File::Spec->updir); } die "Cannot find blib even in $dir\n"; } 1;