lib/perl5/5.6.1/blib.pm

   1 package blib;
   2
   3 =head1 NAME
   4
   5 blib - 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
  15 Looks for MakeMaker-like I<'blib'> directory structure starting in
  16 I<dir> (or current directory) and working back up to five levels of '..'.
  17
  18 Intended for use on command line with B<-M> option as a way of testing
  19 arbitary scripts against an uninstalled version of a package.
  20
  21 However it is possible to :
  22
  23  use blib;
  24  or
  25  use blib '..';
  26
  27 etc. if you really must.
  28
  29 =head1 BUGS
  30
  31 Pollutes global name space for development only task.
  32
  33 =head1 AUTHOR
  34
  35 Nick Ing-Simmons nik@tiuk.ti.com
  36
  37 =cut
  38
  39 use Cwd;
  40
  41 use vars qw($VERSION);
  42 $VERSION = '1.00';
  43
  44 sub import
  45 {
  46  my $package = shift;
  47  my $dir = getcwd;
  48  if ($^O eq 'VMS') { ($dir = VMS::Filespec::unixify($dir)) =~ s-/\z--; }
  49  if (@_)
  50   {
  51    $dir = shift;
  52    $dir =~ s/blib\z//;
  53    $dir =~ s,/+\z,,;
  54    $dir = '.' unless ($dir);
  55    die "$dir is not a directory\n" unless (-d $dir);
  56   }
  57  my $i   = 5;
  58  while ($i--)
  59   {
  60    my $blib = "${dir}/blib";
  61    if (-d $blib && -d "$blib/arch" && -d "$blib/lib")
  62     {
  63      unshift(@INC,"$blib/arch","$blib/lib");
  64      warn "Using $blib\n";
  65      return;
  66     }
  67    $dir .= "/..";
  68   }
  69  die "Cannot find blib even in $dir\n";
  70 }
  71
  72 1;