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 dont 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 }
        ....
    }