NAME

       Email::FolderType - determine the type of a mail folder

SYNOPSIS

         use Email::FolderType qw(folder_type);

         print folder_type "~/mymbox";     # prints 'Mbox'
         print folder_type "~/a_maildir/"; # prints 'Maildir'
         print folder_type "some_mh/.";    # prints 'MH'
         print folder_type "an_archive//"; # prints 'Ezmlm'

DESCRIPTION

       Provides a utility subroutine for detecting the type of a given mail folder.

SUBROUTINES

       folder_type <path>

       Automatically detects what type of mail folder the path refers to and returns the name of
       that type.

       It primarily bases the type on the suffix of the path given.

         Suffix | Type
        --------+---------
         /      | Maildir
         /.     | MH
         //     | Ezmlm

       In case of no known suffix it checks for a known file structure.  If that doesn't work out
       it defaults to "Mbox" although, if the "Mbox" matcher has been overridden or the default
       changed (see DEFAULT MATCHER below) then it will return undef.

       matchers

       Returns a list of all the matchers available to the system.

DEFAULT MATCHER

       Currently the default matcher is "Mbox" and therefore it is always checked last and always
       returns 1.

       If you really want to change this then you should override
       "Email::FolderType::Mbox::match" and/or change the variable $Email::FolderType::DEFAULT to
       be something other than 'Mbox'.

               use Email::FolderType;
               use Email::FolderType::Mbox;

               $Email::FolderType::DEFAULT = 'NewDefault';

           package Email::FolderType::Mbox;
           sub match { return (defined $_[0] && -f $_[0]) }

               package Email::FolderType::NewDefault;
               sub match { return (defined $_[0] && $_[0] =~ m!some crazy pattern!) }
               1;

REGISTERING NEW TYPES

       "Email::FolderType" briefly flirted with a rather clunky "register_type" method for
       registering new matchers but, in retrospect that wasn't a great idea.

       Instead, in this version we've reverted to a "Module::Pluggable" based system - any
       classes in the "Email::FolderType::" namespace will be interrogated to see if they have a
       c<match> method.

       If they do then it will be passed the folder name. If the folder matches then the match
       function should return 1. For example ...

           package Email::FolderType::GzippedMbox;

           sub match {
               my $folder = shift;
               return (-f $folder && $folder =~ /.gz$/);
           }

           1;

       These can even be defined inline ...

           #!perl -w

           use strict;
           use Email::Folder;
           use Email::LocalDelivery;

           # copy all mail from an IMAP folder
           my $folder = Email::Folder->new('imap://example.com'); # read INBOX
           for ($folder->messages) {
               Email::LocalDelivery->deliver($_->as_string, 'local_mbox');
           }

           package Email::FolderType::IMAP;

           sub match {
               my $folder = shift;
               return $folder =~ m!^imap://!;
           }

           1;

       If there is demand for a compatability shim for the old "register_type" method then we can
       implement one. Really though, this is much better in the long run.

PERL EMAIL PROJECT

       This module is maintained by the Perl Email Project.

         http://emailproject.perl.org/wiki/Email::FolderType

AUTHOR

       Simon Wistow <simon@thegestalt.org>

COPYING

       (C) Copyright 2005, Simon Wistow

       Distributed under the same terms as Perl itself.

       This software is under no warranty and will probably ruin your life, kill your friends,
       burn your house and bring about the apocalypse.

SEE ALSO

       Email::LocalDelivery, Email::Folder