NAME

       Test2::Manual::Tooling::Plugin::ToolStarts - How to add behaviors that occur when a tool
       starts work.

DESCRIPTION

       This tutorial will help you write plugins that have behavior when a tool starts. All tools
       should start by acquiring a context object. This tutorial shows you the hooks you can use
       to take advantage of the context acquisition.

COMPLETE CODE UP FRONT

           package Test2::Plugin::MyPlugin;

           use Test2::API qw{
               test2_add_callback_context_init
               test2_add_callback_context_acquire
           };

           sub import {
               my $class = shift;

               # Let us know every time a tool requests a context, and give us a
               # chance to modify the parameters before we find it.
               test2_add_callback_context_acquire(sub {
                   my $params_ref = shift;

                   print "A tool has requested the context\n";
               });

               # Callback every time a new context is created, not called if an
               # existing context is found.
               test2_add_callback_context_init(sub {
                   my $ctx_ref = shift;

                   print "A new context was created\n";
               });
           }

           1;

LINE BY LINE

       use Test2::API qw{test2_add_callback_context_init test2_add_callback_context_acquire};
           This imports the "test2_add_callback_context_init()" and
           "test2_add_callback_context_acquire()" callbacks.

       test2_add_callback_context_acquire(sub { ... })
           This is where we add our callback for context acquisition. Every time
           "Test2::API::context()" is called the callback will be run.

       my $params_ref = shift
           In the test2_add_callback_context_acquire() callbacks we get exactly 1 argument, a
           reference to the parameters that "context()" will use to find the context.

       print "A tool has requested the context\n"
           Print a notification whenever a tool asks for a context.

       test2_add_callback_context_init(sub { ... })
           Add our context init callback. These callbacks are triggered whenever a completely new
           context is created. This is not called if an existing context is found. In short this
           only fires off for the top level tool, not nested tools.

       my $ctx_ref = shift
           The coderefs for test2_add_callback_context_init() will receive exactly 1 argument,
           the newly created context.

       print "A new context was created\n"
           Print a notification whenever a new context is created.

SEE ALSO

       Test2::Manual - Primary index of the manual.

SOURCE

       The source code repository for Test2-Manual can be found at
       https://github.com/Test-More/Test2-Suite/.

MAINTAINERS

       Chad Granum <exodist@cpan.org>

AUTHORS

       Chad Granum <exodist@cpan.org>

COPYRIGHT

       Copyright 2018 Chad Granum <exodist@cpan.org>.

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

       See http://dev.perl.org/licenses/

perl v5.34.0                                2022-0Test2::Manual::Tooling::Plugin::ToolStarts(3pm)