/ 
File-Find-Object-Rule-0.0313
River stage two • 6 direct dependents • 10 total dependents
/ File::Find::Object::Rule::Extending

NAME

File::Find::Object::Rule::Extending - the mini-guide to extending File::Find::Object::Rule

VERSION

version 0.0313

SYNOPSIS

package File::Find::Object::Rule::Random;

use strict;
use warnings;

# take useful things from File::Find::Object::Rule
use base 'File::Find::Object::Rule';

# and force our crack into the main namespace
sub File::Find::Object::Rule::random () {
    my $self = shift()->_force_object;
    $self->exec( sub { rand > 0.5 } );
}

1;

DESCRIPTION

File::Find::Object::Rule inherits File::Find::Rule's extensibility. It is now possible to extend it, using the following conventions.

Declare your package

package File::Find::Object::Rule::Random;

use strict;
use warnings;

Inherit methods from File::Find::Object::Rule

# take useful things from File::Find::Object::Rule
use base 'File::Find::Object::Rule';

Force your madness into the main package

# and force our crack into the main namespace
sub File::Find::Object::Rule::random () {
    my $self = shift()->_force_object;
    $self->exec( sub { rand > 0.5 } );
}

Yes, we're being very cavalier here and defining things into the main File::Find::Object::Rule namespace. This is due to lack of imaginiation on my part - I simply can't find a way for the functional and oo interface to work without doing this or some kind of inheritance, and inheritance stops you using two File::Find::Object::Rule::Foo modules together.

For this reason try and pick distinct names for your extensions. If this becomes a problem then I may institute a semi-official registry of taken names.

Taking no arguments.

Note the null prototype on random. This is a cheat for the procedural interface to know that your sub takes no arguments, and so allows this to happen:

find( random => in => '.' );

If you hadn't declared random with a null prototype it would have consumed in as a parameter to it, then got all confused as it doesn't know about a '.' rule.

NOTES ABOUT THE CALLBACK

The callback can access the File::Find::Object::Result using $self->finder->item_obj().

AUTHOR

Richard Clamp <richardc@unixbeard.net>

COPYRIGHT

Copyright (C) 2002 Richard Clamp. All Rights Reserved.

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

SEE ALSO

File::Find::Object::Rule

File::Find::::Rule::MMagic was the first extension module for File::Find::Rule, so maybe check that out.

SUPPORT

Websites

The following websites have more information about this module, and may be of help to you. As always, in addition to those websites please use your favorite search engine to discover more resources.

Bugs / Feature Requests

Please report any bugs or feature requests by email to bug-file-find-object-rule at rt.cpan.org, or through the web interface at https://rt.cpan.org/Public/Bug/Report.html?Queue=File-Find-Object-Rule. You will be automatically notified of any progress on the request by the system.

Source Code

The code is open to the world, and available for you to hack on. Please feel free to browse it and play with it, or whatever. If you want to contribute patches, please send me a diff or prod me to pull from your repository :)

https://github.com/shlomif/http://bitbucket.org/shlomif/perl-file-find-object-rule

git clone git://github.com/shlomif/http://bitbucket.org/shlomif/perl-file-find-object-rule.git

AUTHORS

  • Richard Clamp <richardc@unixbeard.net>

  • Andy Lester andy@petdance.com.

BUGS

Please report any bugs or feature requests on the bugtracker website https://github.com/shlomif/http://bitbucket.org/shlomif/perl-file-find-object-rule/issues

When submitting a bug or request, please include a test-file or a patch to an existing test-file that illustrates the bug or desired feature.

COPYRIGHT AND LICENSE

This software is copyright (c) 2021 by Richard Clamp.

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.