App::Yath::Options - Tools for defining and tracking yath CLI options.


This class represents a collection of options, and holds the logic for processing them. This package also exports sugar to help you define options.


    package My::Options;

    use App::Yath::Options;

    # This package now has a package instance of options, which can be obtained
    # via the options() method.
    my $options = __PACKAGE__->options;

    # We can include options from other packages

    # Define an option group with some options
    option_group { %common_fields } => sub {

        # Define an option
        option foo => (
            type => 's',
            default => "FOOOOOOO",
            category => 'foo',
            description => "This is foo"
            long_examples => [' value'],

        option bar => ( ... );

    # Action to call right after options are parsed.
    post sub {
        my %params = @_;



$opts = options()
$opts = $class->options()

This returns the options instance associated with your package.


This lets you include options defined in other packages.

option_group \%COMMON_FIELDS => sub { ... }

An option group is simply a block where all calls to option() will have common fields added automatically, this makes it easier to define multiple options that share common fields. Common fields can be overridden inside the option definition.

These are both equivelent:

    # Using option group
    option_group { category => 'foo', prefix => 'foo' } => sub {
        option a => (type => 'b');
        option b => (type => 's');

    # Not using option group
    option a => (type => 'b', category => 'foo', prefix => 'foo');
    option b => (type => 's', category => 'foo', prefix => 'foo');
option TITLE => %FIELDS

Define an option. The first argument is the title attribute for the new option, all other arguments should be attribute/value pairs used to construct the option. See App::Yath::Option for the documentation of attributes.

post sub { ... }
post $weight => sub { ... }

post callbacks are run after all command line arguments have been processed. This is a place to verify the result of several options combined, sanity check, or even add short-circuit behavior. This is how the --help and --show-opts options are implemented.

If no $weight is specified then 0 is used. post callbacks or sorted based on weight with higher values being run later.


In general you should not be using the options instance directly. Options instances are mostly an implementation detail that should be treated as a black box. There are however a few valid reasons to interact with them directly. In those cases there are a few public attributes/methods you can work with. This section documents the public interface.


This section only lists attributes that may be useful to people working with options instances. There are a lot of internal (to yath) attributes that are implementation details that are not listed here. Attributes not listed here are not intended for external use and may change at any time.

$arrayref = $options->all

Arrayref containing all the App::Yath::Option instances in the options instance.

$settings = $options->settings

Get the Test2::Harness::Settings instance.

$arrayref = $options->args

Get the reference to the list of command line arguments. This list is modified as arguments are processed, there are no guarentees about what is in here at any given stage of argument processing.

$class_name = $options->command_class

If yath has determined what command is being executed this will be populated with that command class. This will be undefined if the class has not been determined yet.

$arrayref = $options->used_plugins

This is a list of all plugins who's options have been used. Plugins may appear more than once.

$hashref = $options->included

A hashref where every key is a package who's options have been included into this options instance. The values are an implementation detail, do not rely on them.


This section only lists methods that may be useful to people working with options instances. There are a lot of internal (to yath) methods that are implementation details that are not listed here. Methods not listed here are not intended for external use and may change at any time.

$opt = $options->option(%OPTION_ATTRIBUTES)

This will create a new option with the provided attributes and add it to the options instance. A trace attribute will be automatically set for you.


This method lets you directly include options from a second instance into the first.


This lets you include options from multiple classes that have options defined.


This lets you include a single already defined option instance.

$options->pre_docs($format, @args)

Get documentation for pre-command options. $format may be 'cli' or 'pod'.

$options->cmd_docs($format, @args)

Get documentation for command options. $format may be 'cli' or 'pod'.


The source code repository for Test2-Harness can be found at


Chad Granum <>


Chad Granum <>


Copyright 2020 Chad Granum <>.

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