1package blib; 2 3=head1 NAME 4 5blib - Use MakeMaker's uninstalled version of a package 6 7=head1 SYNOPSIS 8 9 perl -Mblib script [args...] 10 11 perl -Mblib=dir script [args...] 12 13=head1 DESCRIPTION 14 15Looks for MakeMaker-like I<'blib'> directory structure starting in 16I<dir> (or current directory) and working back up to five levels of '..'. 17 18Intended for use on command line with B<-M> option as a way of testing 19arbitrary scripts against an uninstalled version of a package. 20 21However it is possible to : 22 23 use blib; 24 or 25 use blib '..'; 26 27etc. if you really must. 28 29=head1 BUGS 30 31Pollutes global name space for development only task. 32 33=head1 AUTHOR 34 35Nick Ing-Simmons nik@tiuk.ti.com 36 37=cut 38 39use Cwd; 40use File::Spec; 41 42use vars qw($VERSION $Verbose); 43$VERSION = '1.06'; 44$Verbose = 0; 45 46sub import 47{ 48 my $package = shift; 49 my $dir; 50 if ($^O eq "MSWin32" && -f "Win32.xs") { 51 # We don't use getcwd() on Windows because it will internally 52 # call Win32::GetCwd(), which will get the Win32 module loaded. 53 # That means that it would not be possible to run `make test` 54 # for the Win32 module because blib.pm would always load the 55 # installed version before @INC gets updated with the blib path. 56 chomp($dir = `cd`); 57 } 58 else { 59 $dir = getcwd; 60 } 61 if ($^O eq 'VMS') { ($dir = VMS::Filespec::unixify($dir)) =~ s-/\z--; } 62 if (@_) 63 { 64 $dir = shift; 65 $dir =~ s/blib\z//; 66 $dir =~ s,/+\z,,; 67 $dir = File::Spec->curdir unless ($dir); 68 die "$dir is not a directory\n" unless (-d $dir); 69 } 70 71 # detaint: if the user asked for blib, s/he presumably knew 72 # what s/he wanted 73 $dir = $1 if $dir =~ /^(.*)$/; 74 75 my $i = 5; 76 my($blib, $blib_lib, $blib_arch); 77 while ($i--) 78 { 79 $blib = File::Spec->catdir($dir, "blib"); 80 $blib_lib = File::Spec->catdir($blib, "lib"); 81 $blib_arch = File::Spec->catdir($blib, "arch"); 82 83 if (-d $blib && -d $blib_arch && -d $blib_lib) 84 { 85 unshift(@INC,$blib_arch,$blib_lib); 86 warn "Using $blib\n" if $Verbose; 87 return; 88 } 89 $dir = File::Spec->catdir($dir, File::Spec->updir); 90 } 91 die "Cannot find blib even in $dir\n"; 92} 93 941; 95