03-14-2019
Now, this problem has been solved umpteen times in these fora. Try searching relevant threads and adapting the given solutions. You may start with the links at this page's lower left under "More UNIX and Linux Forum Topics You Might Find Helpful".
This User Gave Thanks to RudiC For This Post:
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LEARN ABOUT CENTOS
file::find::rule::extending
File::Find::Rule::Extending(3) User Contributed Perl Documentation File::Find::Rule::Extending(3)
NAME
File::Find::Rule::Extending - the mini-guide to extending File::Find::Rule
SYNOPSIS
package File::Find::Rule::Random;
use strict;
# take useful things from File::Find::Rule
use base 'File::Find::Rule';
# and force our crack into the main namespace
sub File::Find::Rule::random () {
my $self = shift()->_force_object;
$self->exec( sub { rand > 0.5 } );
}
1;
DESCRIPTION
File::Find::Rule went down so well with the buying public that everyone wanted to add extra features. With the 0.07 release this became a
possibility, using the following conventions.
Declare your package
package File::Find::Rule::Random;
use strict;
Inherit methods from File::Find::Rule
# take useful things from File::Find::Rule
use base 'File::Find::Rule';
Force your madness into the main package
# and force our crack into the main namespace
sub File::Find::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::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::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.
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::Rule
File::Find::Rule::MMagic was the first extension module, so maybe check that out.
perl v5.16.3 2011-09-19 File::Find::Rule::Extending(3)