NAME
    Plugin::System - An opinionated plugin system for your Perl
    framework/application

VERSION
    This document describes version 0.000 of Plugin::System (from Perl
    distribution Plugin-System), released on 2023-07-23.

SYNOPSIS
     package Your::Framework;
     use Plugin::System;

     Plugin::System->init_plugin_system(

         # optional, default to caller package (i.e. in this case, Your::Framework)
         namespace => 'Your::Framework::Plugin',

         # required, list of known events
         events => {
             check_input => { ... },
             output => { ... },
             ...
         },
         ...

     );

     sub bar {
         ...
         __PACKAGE__->run_event_with_plugins(
             event => 'check_input',
             # req_handler => 0,                         # optional
             # run_all_handlers => 1,                    # optional
             # allow_before_handler_to_skip_rest => 1,   # optional
             # allow_handler_to_skip_rest => 1,          # optional
             # allow_handler_to_repeat_event => 1,       # optional
             # allow_after_handler_to_skip_rest => 1,    # optional
             # allow_after_handler_to_repeat_event => 1, # optional
             # stop_after_first_handler_failure => 1,    # optional
         );
     }

     1;

    Afterwards, your framework can use the plugin system, e.g.:

     # a plugin module, containing handlers and meta information
     package Your::Framework::Plugin::Foo;

     sub plugin_meta {
         return +{ priority => ..., };
     }

     sub new {
         my ($self, %args) = @_;
         ...
     }

     # required handler if we want to handle the 'check_input' event
     sub on_check_input {
         ...

         # plugin can signal success by returning [200] or error by returning [4xx]
         # or [5xx] status. it can also return [201] to instruct run_event() to skip
         # calling the rest of the plugins for the event. it can also return [204]
         # to "decline".
     }

     # a before_ handler is optional
     sub before_check_input {
         my ($self, $r) = @_;
         ...

         # plugin can instruct to cancel the event by returning [601].
     }

     # an after_ handler is optional
     sub after_check_input {
         my ($self, $r) = @_;
         ...
         # plugin can instruct to repeat an event by returning [602].
     }

     1;

    To use the plugin, user can activate it:

     use Your::Framework 'Foo' => {arg=>..., arg2 => ...};

DESCRIPTION
    NOT YET IMPLEMENTED. A NAME GRAB ONLY.

    A plugin approach offers flexibility. Users can enable or disable
    plugins which they need, sometimes also in the order that they want.
    Each plugin can supply behavior at various points (events) in an
    application. More than one plugin (also multiple instances of the same
    plugin) can supply behavior for a single event. In addition, a plugin
    can modify the flow of the application by aborting or repeating an
    event.

HOMEPAGE
    Please visit the project's homepage at
    <https://metacpan.org/release/Plugin-System>.

SOURCE
    Source repository is at
    <https://github.com/perlancar/perl-Plugin-System>.

SEE ALSO
    Module::Pluggable and its variants like Module::Pluggable::Fast.

AUTHOR
    perlancar <perlancar@cpan.org>

CONTRIBUTING
    To contribute, you can send patches by email/via RT, or send pull
    requests on GitHub.

    Most of the time, you don't need to build the distribution yourself. You
    can simply modify the code, then test via:

     % prove -l

    If you want to build the distribution (e.g. to try to install it locally
    on your system), you can install Dist::Zilla,
    Dist::Zilla::PluginBundle::Author::PERLANCAR,
    Pod::Weaver::PluginBundle::Author::PERLANCAR, and sometimes one or two
    other Dist::Zilla- and/or Pod::Weaver plugins. Any additional steps
    required beyond that are considered a bug and can be reported to me.

COPYRIGHT AND LICENSE
    This software is copyright (c) 2023 by perlancar <perlancar@cpan.org>.

    This is free software; you can redistribute it and/or modify it under
    the same terms as the Perl 5 programming language system itself.

BUGS
    Please report any bugs or feature requests on the bugtracker website
    <https://rt.cpan.org/Public/Dist/Display.html?Name=Plugin-System>

    When submitting a bug or request, please include a test-file or a patch
    to an existing test-file that illustrates the bug or desired feature.