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ExtUtils::Packlist(3)  Perl Programmers Reference Guide	 ExtUtils::Packlist(3)

NAME
       ExtUtils::Packlist - manage .packlist files

SYNOPSIS
	  use ExtUtils::Packlist;
	  my ($pl) = ExtUtils::Packlist->new('.packlist');
	  $pl->read('/an/old/.packlist');
	  my @missing_files = $pl->validate();
	  $pl->write('/a/new/.packlist');

	  $pl->{'/some/file/name'}++;
	     or
	  $pl->{'/some/other/file/name'} = { type => 'file',
					     from => '/some/file' };

DESCRIPTION
       ExtUtils::Packlist provides a standard way to manage .packlist files.
       Functions are provided to read and write .packlist files.  The original
       .packlist format is a simple list of absolute pathnames, one per line.
       In addition, this package supports an extended format, where as well as
       a filename each line may contain a list of attributes in the form of a
       space separated list of key=value pairs.	 This is used by the
       installperl script to differentiate between files and links, for
       example.

USAGE
       The hash reference returned by the new() function can be used to
       examine and modify the contents of the .packlist.  Items may be
       added/deleted from the .packlist by modifying the hash.	If the value
       associated with a hash key is a scalar, the entry written to the
       .packlist by any subsequent write() will be a simple filename.  If the
       value is a hash, the entry written will be the filename followed by the
       key=value pairs from the hash.  Reading back the .packlist will
       recreate the original entries.

FUNCTIONS
       new()
	   This takes an optional parameter, the name of a .packlist.  If the
	   file exists, it will be opened and the contents of the file will be
	   read.  The new() method returns a reference to a hash.  This hash
	   holds an entry for each line in the .packlist.  In the case of old-
	   style .packlists, the value associated with each key is undef.  In
	   the case of new-style .packlists, the value associated with each
	   key is a hash containing the key=value pairs following the filename
	   in the .packlist.

       read()
	   This takes an optional parameter, the name of the .packlist to be
	   read.  If no file is specified, the .packlist specified to new()
	   will be read.  If the .packlist does not exist, Carp::croak will be
	   called.

       write()
	   This takes an optional parameter, the name of the .packlist to be
	   written.  If no file is specified, the .packlist specified to new()
	   will be overwritten.

       validate()
	   This checks that every file listed in the .packlist actually
	   exists.  If an argument which evaluates to true is given, any
	   missing files will be removed from the internal hash.  The return
	   value is a list of the missing files, which will be empty if they
	   all exist.

       packlist_file()
	   This returns the name of the associated .packlist file

EXAMPLE
       Here's "modrm", a little utility to cleanly remove an installed module.

	   #!/usr/local/bin/perl -w

	   use strict;
	   use IO::Dir;
	   use ExtUtils::Packlist;
	   use ExtUtils::Installed;

	   sub emptydir($) {
	       my ($dir) = @_;
	       my $dh = IO::Dir->new($dir) || return(0);
	       my @count = $dh->read();
	       $dh->close();
	       return(@count == 2 ? 1 : 0);
	   }

	   # Find all the installed packages
	   print("Finding all installed modules...\n");
	   my $installed = ExtUtils::Installed->new();

	   foreach my $module (grep(!/^Perl$/, $installed->modules())) {
	      my $version = $installed->version($module) || "???";
	      print("Found module $module Version $version\n");
	      print("Do you want to delete $module? [n] ");
	      my $r = <STDIN>; chomp($r);
	      if ($r && $r =~ /^y/i) {
		 # Remove all the files
		 foreach my $file (sort($installed->files($module))) {
		    print("rm $file\n");
		    unlink($file);
		 }
		 my $pf = $installed->packlist($module)->packlist_file();
		 print("rm $pf\n");
		 unlink($pf);
		 foreach my $dir (sort($installed->directory_tree($module))) {
		    if (emptydir($dir)) {
		       print("rmdir $dir\n");
		       rmdir($dir);
		    }
		 }
	      }
	   }

AUTHOR
       Alan Burlison <Alan.Burlison@uk.sun.com>

perl v5.10.0			  2007-12-18		 ExtUtils::Packlist(3)
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