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App::Cmd::Setup - helper for setting up App::Cmd classes

App::Cmd::Setup(3pm) User Contributed Perl Documentation App::Cmd::Setup(3pm)


App::Cmd::Setup - helper for setting up App::Cmd classes


version 0.331


App::Cmd::Setup is a helper library, used to set up base classes that will be used as part of an App::Cmd program. For the most part you should refer to the tutorial for how you should use this library.
This class is useful in three scenarios:
when writing your App::Cmd subclass
Instead of writing:
  package MyApp;
  use base 'App::Cmd'; can write:
  package MyApp;
  use App::Cmd::Setup -app;
The benefits of doing this are mostly minor, and relate to sanity-checking your class. The significant benefit is that this form allows you to specify plugins, as in:
  package MyApp;
  use App::Cmd::Setup -app => { plugins => [ 'Prompt' ] };
Plugins are described in App::Cmd::Tutorial and App::Cmd::Plugin.
when writing abstract base classes for commands
That is: when you write a subclass of App::Cmd::Command that is intended for other commands to use as their base class, you should use App::Cmd::Setup. For example, if you want all the commands in MyApp to inherit from MyApp::Command, you may want to write that package like this:
  package MyApp::Command;
  use App::Cmd::Setup -command;
Do not confuse this with the way you will write specific commands:
  package MyApp::Command::mycmd;
  use MyApp -command;
Again, this form mostly performs some validation and setup behind the scenes for you. You can use "base" if you prefer.
when writing App::Cmd plugins
App::Cmd::Plugin is a mechanism that allows an App::Cmd class to inject code into all its command classes, providing them with utility routines.
To write a plugin, you must use App::Cmd::Setup. As seen above, you must also use App::Cmd::Setup to set up your App::Cmd subclass if you wish to consume plugins.
For more information on writing plugins, see App::Cmd::Manual and App::Cmd::Plugin.


Ricardo Signes <> This software is copyright (c) 2016 by Ricardo Signes.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.
2016-07-18 perl v5.22.2