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File: HOWTO.pod
=head1 NAME CPANPLUS::Shell::Default::Plugins::HOWTO -- documentation on how to write your own plugins =head1 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" } =head1 DESCRIPTION This pod text explains how to write your own plugins for C<CPANPLUS::Shell::Default>. =head1 HOWTO =head2 Registering Plugin Modules Plugins are detected by using C<Module::Pluggable>. Every module in the C<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 C<.pm> file. =head2 Registering Plugin Commands To register any plugin commands, a list of key value pairs must be returned by a C<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 C</helloworld> command, this command will be dispatched to the plugin, and its C<hw> method will be called =head2 Registering Plugin Help To provide usage information for your plugin, the user of the default shell can type C</? PLUGIN_COMMAND>. In that case, the function C<PLUGIN_COMMAND_help> will be called in your plugin package. For example, extending the above example, when a user calls C</? helloworld>, the function C<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. =head2 Arguments to Plugin Commands Any plugin function will receive the following arguments when called, which are all positional: =over 4 =item Classname -- The name of your plugin class =item Shell -- The CPANPLUS::Shell::Default object =item Backend -- The CPANPLUS::Backend object =item Command -- The command issued by the user =item Input -- The input string from the user =item Options -- A hashref of options provided by the user =back 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 } .... } =head1 BUG REPORTS Please report bugs or other issues to E<lt>bug-cpanplus@rt.cpan.org<gt>. =head1 AUTHOR This module by Jos Boumans E<lt>kane@cpan.orgE<gt>. =head1 COPYRIGHT The CPAN++ interface (of which this module is a part of) is copyright (c) 2001 - 2007, Jos Boumans E<lt>kane@cpan.orgE<gt>. All rights reserved. This library is free software; you may redistribute and/or modify it under the same terms as Perl itself. =head1 SEE ALSO L<CPANPLUS::Shell::Default>, L<CPANPLUS::Shell>, L<cpanp> =cut # Local variables: # c-indentation-style: bsd # c-basic-offset: 4 # indent-tabs-mode: nil # End: # vim: expandtab shiftwidth=4: