Provided by: libmousex-getopt-perl_0.34-1_all 
NAME
MouseX::Getopt - A Mouse role for processing command line options
SYNOPSIS
## In your class
package My::App;
use Mouse;
with 'MouseX::Getopt';
has 'out' => (is => 'rw', isa => 'Str', required => 1);
has 'in' => (is => 'rw', isa => 'Str', required => 1);
# ... rest of the class here
## in your script
#!/usr/bin/perl
use My::App;
my $app = My::App->new_with_options();
# ... rest of the script here
## on the command line
% perl my_app_script.pl -in file.input -out file.dump
DESCRIPTION
This is a role which provides an alternate constructor for creating objects using parameters passed in
from the command line.
This module attempts to DWIM as much as possible with the command line params by introspecting your
class's attributes. It will use the name of your attribute as the command line option, and if there is a
type constraint defined, it will configure Getopt::Long to handle the option accordingly.
You can use the trait MouseX::Getopt::Meta::Attribute::Trait or the attribute metaclass
MouseX::Getopt::Meta::Attribute to get non-default commandline option names and aliases.
You can use the trait MouseX::Getopt::Meta::Attribute::Trait::NoGetopt or the attribute metaclass
MouseX::Getopt::Meta::Attribute::NoGetopt to have "MouseX::Getopt" ignore your attribute in the
commandline options.
By default, attributes which start with an underscore are not given commandline argument support, unless
the attribute's metaclass is set to MouseX::Getopt::Meta::Attribute. If you don't want your accessors to
have the leading underscore in their name, you can do this:
# for read/write attributes
has '_foo' => (accessor => 'foo', ...);
# or for read-only attributes
has '_bar' => (reader => 'bar', ...);
This will mean that Getopt will not handle a --foo param, but your code can still call the "foo" method.
If your class also uses a configfile-loading role based on MouseX::ConfigFromFile, such as
MouseX::SimpleConfig, MouseX::Getopt's "new_with_options" will load the configfile specified by the
"--configfile" option (or the default you've given for the configfile attribute) for you.
Options specified in multiple places follow the following precedence order: commandline overrides
configfile, which overrides explicit new_with_options parameters.
Supported Type Constraints
Bool
A Bool type constraint is set up as a boolean option with Getopt::Long. So that this attribute
description:
has 'verbose' => (is => 'rw', isa => 'Bool');
would translate into "verbose!" as a Getopt::Long option descriptor, which would enable the following
command line options:
% my_script.pl --verbose
% my_script.pl --noverbose
Int, Float, Str
These type constraints are set up as properly typed options with Getopt::Long, using the "=i", "=f"
and "=s" modifiers as appropriate.
ArrayRef
An ArrayRef type constraint is set up as a multiple value option in Getopt::Long. So that this
attribute description:
has 'include' => (
is => 'rw',
isa => 'ArrayRef',
default => sub { [] }
);
would translate into "includes=s@" as a Getopt::Long option descriptor, which would enable the
following command line options:
% my_script.pl --include /usr/lib --include /usr/local/lib
HashRef
A HashRef type constraint is set up as a hash value option in Getopt::Long. So that this attribute
description:
has 'define' => (
is => 'rw',
isa => 'HashRef',
default => sub { {} }
);
would translate into "define=s%" as a Getopt::Long option descriptor, which would enable the
following command line options:
% my_script.pl --define os=linux --define vendor=debian
Custom Type Constraints
It is possible to create custom type constraint to option spec mappings if you need them. The process is
fairly simple (but a little verbose maybe). First you create a custom subtype, like so:
subtype 'ArrayOfInts'
=> as 'ArrayRef'
=> where { scalar (grep { looks_like_number($_) } @$_) };
Then you register the mapping, like so:
MouseX::Getopt::OptionTypeMap->add_option_type_to_map(
'ArrayOfInts' => '=i@'
);
Now any attribute declarations using this type constraint will get the custom option spec. So that, this:
has 'nums' => (
is => 'ro',
isa => 'ArrayOfInts',
default => sub { [0] }
);
Will translate to the following on the command line:
% my_script.pl --nums 5 --nums 88 --nums 199
This example is fairly trivial, but more complex validations are easily possible with a little
creativity. The trick is balancing the type constraint validations with the Getopt::Long validations.
Better examples are certainly welcome :)
Inferred Type Constraints
If you define a custom subtype which is a subtype of one of the standard "Supported Type Constraints"
above, and do not explicitly provide custom support as in "Custom Type Constraints" above, MouseX::Getopt
will treat it like the parent type for Getopt purposes.
For example, if you had the same custom "ArrayOfInts" subtype from the examples above, but did not add a
new custom option type for it to the "OptionTypeMap", it would be treated just like a normal "ArrayRef"
type for Getopt purposes (that is, "=s@").
METHODS
new_with_options (%params)
This method will take a set of default %params and then collect params from the command line (possibly
overriding those in %params) and then return a newly constructed object.
The special parameter "argv", if specified should point to an array reference with an array to use
instead of @ARGV.
If "GetOptions" in Getopt::Long fails (due to invalid arguments), "new_with_options" will throw an
exception.
If Getopt::Long::Descriptive is installed and any of the following command line params are passed, the
program will exit with usage information (and the option's state will be stored in the help_flag
attribute). You can add descriptions for each option by including a documentation option for each
attribute to document.
--?
--help
--usage
If you have Getopt::Long::Descriptive the "usage" param is also passed to "new" as the usage option.
ARGV
This accessor contains a reference to a copy of the @ARGV array as it originally existed at the time of
"new_with_options".
extra_argv
This accessor contains an arrayref of leftover @ARGV elements that Getopt::Long did not parse. Note that
the real @ARGV is left un-mangled.
usage
This accessor contains the Getopt::Long::Descriptive::Usage object (if Getopt::Long::Descriptive is
used).
help_flag
This accessor contains the boolean state of the --help, --usage and --? options (true if any of these
options were passed on the command line).
meta
This returns the role meta object.
AUTHORS
• NAKAGAWA Masaki <masaki@cpan.org>
• FUJI Goro <gfuji@cpan.org>
• Stevan Little <stevan@iinteractive.com>
• Brandon L. Black <blblack@gmail.com>
• Yuval Kogman <nothingmuch@woobling.org>
• Ryan D Johnson <ryan@innerfence.com>
• Drew Taylor <drew@drewtaylor.com>
• Tomas Doran <bobtfish@bobtfish.net>
• Florian Ragwitz <rafl@debian.org>
• Dagfinn Ilmari Mannsaker <ilmari@ilmari.org>
• Avar Arnfjord Bjarmason <avar@cpan.org>
• Chris Prather <perigrin@cpan.org>
• Mark Gardner <mjgardner@cpan.org>
COPYRIGHT AND LICENSE
This software is copyright (c) 2012 by Infinity Interactive, Inc.
This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5
programming language system itself.