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Manual Reference Pages  -  CPANPLUS::SHELL::DEFAULT::PLUGINS::HOWTO (3)

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NAME

CPANPLUS::Shell::Default::Plugins::HOWTO -- documentation on how to write your own plugins

CONTENTS

SYNOPSIS



    package CPANPLUS::Shell::Default::Plugins::MyPlugin;

    ### return command => method mapping
    sub plugins { ( myplugin1 => mp1, myplugin2 => mp2 ) }

    ### method called when the command /myplugin1 is issued
    sub mp1 { .... }

    ### method called when the command /? myplugin1 is issued
    sub mp1_help { return "Help Text" }



DESCRIPTION

This pod text explains how to write your own plugins for CPANPLUS::Shell::Default.

HOWTO

    Registering Plugin Modules

Plugins are detected by using Module::Pluggable. Every module in the CPANPLUS::Shell::Default::Plugins::* namespace is considered a plugin, and is attempted to be loaded.

Therefor, any plugin must be declared in that namespace, in a corresponding .pm file.

    Registering Plugin Commands

To register any plugin commands, a list of key value pairs must be returned by a plugins method in your package. The keys are the commands you wish to register, the values are the methods in the plugin package you wish to have called when the command is issued.

For example, a simple ’Hello, World!’ plugin:



    package CPANPLUS::Shell::Default::Plugins::HW;

    sub plugins { return ( helloworld => hw ) };

    sub hw { print "Hello, world!\n" }



When the user in the default shell now issues the /helloworld command, this command will be dispatched to the plugin, and its hw method will be called

    Registering Plugin Help

To provide usage information for your plugin, the user of the default shell can type /? PLUGIN_COMMAND. In that case, the function PLUGIN_COMMAND_help will be called in your plugin package.

For example, extending the above example, when a user calls /? helloworld, the function hw_help will be called, which might look like this:



    sub hw_help { "    /helloworld      # prints "Hello, world!\n" }



If you don’t provide a corresponding _help function to your commands, the default shell will handle it gracefully, but the user will be stuck without usage information on your commands, so it’s considered undesirable to omit the help functions.

    Arguments to Plugin Commands

Any plugin function will receive the following arguments when called, which are all positional:
Classname — The name of your plugin class
Shell — The CPANPLUS::Shell::Default object
Backend — The CPANPLUS::Backend object
Command — The command issued by the user
Input — The input string from the user
Options — A hashref of options provided by the user
For example, the following command:



    /helloworld bob --nofoo --bar=2 joe



Would yield the following arguments:



    sub hw {
        my $class   = shift;    # CPANPLUS::Shell::Default::Plugins::HW
        my $shell   = shift;    # CPANPLUS::Shell::Default object
        my $cb      = shift;    # CPANPLUS::Backend object
        my $cmd     = shift;    # helloworld
        my $input   = shift;    # bob joe
        my $opts    = shift;    # { foo => 0, bar => 2 }

        ....
    }



BUG REPORTS

Please report bugs or other issues to <bug-cpanplus@rt.cpan.org<gt>.

AUTHOR

This module by Jos Boumans <kane@cpan.org>.

COPYRIGHT

The CPAN++ interface (of which this module is a part of) is copyright (c) 2001 - 2007, Jos Boumans <kane@cpan.org>. All rights reserved.

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

SEE ALSO

CPANPLUS::Shell::Default, CPANPLUS::Shell, cpanp
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perl v5.20.3 CPANPLUS::SHELL::DEFAULT::PLUGINS::HOWTO (3) 2013-05-20

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