1MooseX::Getopt(3pm) User Contributed Perl Documentation MooseX::Getopt(3pm)
2
6 MooseX::Getopt - A Moose role for processing command line options
7
9 version 0.75
10
12 ## In your class
13 package My::App;
14 use Moose;
15 with 'MooseX::Getopt';
17 has 'out' => (is => 'rw', isa => 'Str', required => 1);
19 has 'in' => (is => 'rw', isa => 'Str', required => 1);
20 # ... rest of the class here
22 ## in your script
24 #!/usr/bin/perl
25 use My::App;
27 my $app = My::App->new_with_options();
29 # ... rest of the script here
30 ## on the command line
32 % perl my_app_script.pl -in file.input -out file.dump
33
35 This is a role which provides an alternate constructor for creating
36 objects using parameters passed in from the command line.
37
39 "new_with_options (%params)"
40 This method will take a set of default %params and then collect
41 parameters from the command line (possibly overriding those in %params)
42 and then return a newly constructed object.
43 The special parameter "argv", if specified should point to an array
45 reference with an array to use instead of @ARGV.
46 If "GetOptions" in Getopt::Long fails (due to invalid arguments),
48 "new_with_options" will throw an exception.
49 If Getopt::Long::Descriptive is installed and any of the following
51 command line parameters are passed, the program will exit with usage
52 information (and the option's state will be stored in the help_flag
53 attribute). You can add descriptions for each option by including a
54 documentation option for each attribute to document.
55 -?
57 --?
58 -h
59 --help
60 --usage
61 If you have Getopt::Long::Descriptive the "usage" parameter is also
63 passed to "new" as the usage option.
64 "ARGV"
66 This accessor contains a reference to a copy of the @ARGV array as it
67 originally existed at the time of "new_with_options".
68 "extra_argv"
70 This accessor contains an arrayref of leftover @ARGV elements that
71 Getopt::Long did not parse. Note that the real @ARGV is left
72 untouched.
73 Important: By default, Getopt::Long will reject unrecognized options
75 (that is, options that do not correspond with attributes using the
76 "Getopt" trait). To disable this, and allow options to also be saved in
77 "extra_argv" (for example to pass along to another class's
78 "new_with_options"), you can either enable the "pass_through" option of
79 Getopt::Long for your class: "use Getopt::Long qw(:config
80 pass_through);" or specify a value for MooseX::Getopt::GLD's
81 "getopt_conf" parameter.
82 "usage"
84 This accessor contains the Getopt::Long::Descriptive::Usage object (if
85 Getopt::Long::Descriptive is used).
86 "help_flag"
88 This accessor contains the boolean state of the --help, --usage and --?
89 options (true if any of these options were passed on the command line).
90 "print_usage_text"
92 This method is called internally when the "help_flag" state is true.
93 It prints the text from the "usage" object (see above) to "STDOUT" (and
94 then after this method is called, the program terminates normally).
95 You can apply a method modification (see
96 Moose::Manual::MethodModifiers) if different behaviour is desired, for
97 example to include additional text.
98 "meta"
100 This returns the role meta object.
101 "process_argv (%params)"
103 This does most of the work of "new_with_options", analyzing the
104 parameters and "argv", except for actually calling the constructor. It
105 returns a MooseX::Getopt::ProcessedArgv object. "new_with_options" uses
106 this method internally, so modifying this method via subclasses/roles
107 will affect "new_with_options".
108 This module attempts to DWIM as much as possible with the command line
110 parameters by introspecting your class's attributes. It will use the
111 name of your attribute as the command line option, and if there is a
112 type constraint defined, it will configure Getopt::Long to handle the
113 option accordingly.
114 You can use the trait MooseX::Getopt::Meta::Attribute::Trait or the
116 attribute metaclass MooseX::Getopt::Meta::Attribute to get non-default
117 command-line option names and aliases.
118 You can use the trait MooseX::Getopt::Meta::Attribute::Trait::NoGetopt
120 or the attribute metaclass MooseX::Getopt::Meta::Attribute::NoGetopt to
121 have "MooseX::Getopt" ignore your attribute in the command-line
122 options.
123 By default, attributes which start with an underscore are not given
125 command-line argument support, unless the attribute's metaclass is set
126 to MooseX::Getopt::Meta::Attribute. If you don't want your accessors to
127 have the leading underscore in their name, you can do this:
128 # for read/write attributes
130 has '_foo' => (accessor => 'foo', ...);
131 # or for read-only attributes
133 has '_bar' => (reader => 'bar', ...);
134 This will mean that MooseX::Getopt will not handle a --foo parameter,
136 but your code can still call the "foo" method.
137 If your class also uses a configfile-loading role based on
139 MooseX::ConfigFromFile, such as MooseX::SimpleConfig, MooseX::Getopt's
140 "new_with_options" will load the configfile specified by the
141 "--configfile" option (or the default you've given for the configfile
142 attribute) for you.
143 Options specified in multiple places follow the following precedence
145 order: command-line overrides configfile, which overrides explicit
146 new_with_options parameters.
147 Supported Type Constraints
149 Bool
150 A Bool type constraint is set up as a boolean option with
151 Getopt::Long. So that this attribute description:
152 has 'verbose' => (is => 'rw', isa => 'Bool');
154 would translate into "verbose!" as a Getopt::Long option
156 descriptor, which would enable the following command line options:
157 % my_script.pl --verbose
159 % my_script.pl --noverbose
160 Int, Float, Str
162 These type constraints are set up as properly typed options with
163 Getopt::Long, using the "=i", "=f" and "=s" modifiers as
164 appropriate.
165 ArrayRef
167 An ArrayRef type constraint is set up as a multiple value option in
168 Getopt::Long. So that this attribute description:
169 has 'include' => (
171 is => 'rw',
172 isa => 'ArrayRef',
173 default => sub { [] }
174 );
175 would translate into "includes=s@" as a Getopt::Long option
177 descriptor, which would enable the following command line options:
178 % my_script.pl --include /usr/lib --include /usr/local/lib
180 HashRef
182 A HashRef type constraint is set up as a hash value option in
183 Getopt::Long. So that this attribute description:
184 has 'define' => (
186 is => 'rw',
187 isa => 'HashRef',
188 default => sub { {} }
189 );
190 would translate into "define=s%" as a Getopt::Long option
192 descriptor, which would enable the following command line options:
193 % my_script.pl --define os=linux --define vendor=debian
195 Custom Type Constraints
197 It is possible to create custom type constraint to option spec mappings
198 if you need them. The process is fairly simple (but a little verbose
199 maybe). First you create a custom subtype, like so:
200 subtype 'ArrayOfInts'
202 => as 'ArrayRef'
203 => where { scalar (grep { looks_like_number($_) } @$_) };
204 Then you register the mapping, like so:
206 MooseX::Getopt::OptionTypeMap->add_option_type_to_map(
208 'ArrayOfInts' => '=i@'
209 );
210 Now any attribute declarations using this type constraint will get the
212 custom option spec. So that, this:
213 has 'nums' => (
215 is => 'ro',
216 isa => 'ArrayOfInts',
217 default => sub { [0] }
218 );
219 Will translate to the following on the command line:
221 % my_script.pl --nums 5 --nums 88 --nums 199
223 This example is fairly trivial, but more complex validations are easily
225 possible with a little creativity. The trick is balancing the type
226 constraint validations with the Getopt::Long validations.
227 Better examples are certainly welcome :)
229 Inferred Type Constraints
231 If you define a custom subtype which is a subtype of one of the
232 standard "Supported Type Constraints" above, and do not explicitly
233 provide custom support as in "Custom Type Constraints" above,
234 MooseX::Getopt will treat it like the parent type for Getopt purposes.
235 For example, if you had the same custom "ArrayOfInts" subtype from the
237 examples above, but did not add a new custom option type for it to the
238 "OptionTypeMap", it would be treated just like a normal "ArrayRef" type
239 for Getopt purposes (that is, "=s@").
240 More Customization Options
242 See "Configuring Getopt::Long" in Getopt::Long for many other
243 customizations you can make to how options are parsed. Simply "use
244 Getopt::Long qw(:config other_options...)" in your class to set these.
245 Note in particular that the default setting for case sensitivity has
247 changed over time in Getopt::Long::Descriptive, so if you rely on a
248 particular setting, you should set it explicitly, or enforce the
249 version of Getopt::Long::Descriptive that you install.
250
252 • MooseX::Getopt::Usage, an extension to generate man pages, with
253 colour
254 • MooX::Options, similar functionality for Moo
256
258 Bugs may be submitted through the RT bug tracker
259 <https://rt.cpan.org/Public/Dist/Display.html?Name=MooseX-Getopt> (or
260 bug-MooseX-Getopt@rt.cpan.org <mailto:bug-MooseX-Getopt@rt.cpan.org>).
261 There is also a mailing list available for users of this distribution,
263 at <http://lists.perl.org/list/moose.html>.
264 There is also an irc channel available for users of this distribution,
266 at "#moose" on "irc.perl.org" <irc://irc.perl.org/#moose>.
267
269 Stevan Little <stevan@iinteractive.com>
270
272 • Karen Etheridge <ether@cpan.org>
273 • Tomas Doran <bobtfish@bobtfish.net>
275 • Stevan Little <stevan.little@iinteractive.com>
277 • Yuval Kogman <nothingmuch@woobling.org>
279 • Florian Ragwitz <rafl@debian.org>
281 • Brandon L Black <blblack@gmail.com>
283 • Shlomi Fish <shlomif@cpan.org>
285 • Hans Dieter Pearcey <hdp@weftsoar.net>
287 • Olaf Alders <olaf@wundersolutions.com>
289 • Dave Rolsky <autarch@urth.org>
291 • Nelo Onyiah <nelo.onyiah@gmail.com>
293 • Ryan D Johnson <ryan@innerfence.com>
295 • Ricardo SIGNES <rjbs@cpan.org>
297 • AEvar Arnfjoerd` Bjarmason <avarab@gmail.com>
299 • Damien Krotkine <dkrotkine@weborama.com>
301 • Hinrik Oern Sigurd`sson <hinrik.sig@gmail.com>
303 • Chris Prather <chris@prather.org>
305 • Devin Austin <dhoss@cpan.org>
307 • Gregory Oschwald <goschwald@maxmind.com>
309 • Jose Luis Martinez <jlmartinez@capside.com>
311 • Todd Hepler <thepler@employees.org>
313 • Andreas Koenig <andk@cpan.org>
315 • Andreas Koenig <Andreas.Koenig.extern@telecolumbus.de>
317 • Dagfinn Ilmari Mannsaaker <ilmari@ilmari.org>
319 • Damyan Ivanov <dmn@debian.org>
321 • Drew Taylor <drew@drewtaylor.com>
323 • Gordon Irving <goraxe@goraxe.me.uk>
325 • Jesse Luehrs <doy@tozt.net>
327 • John Goulah <jgoulah@cpan.org>
329 • Jonathan Swartz <swartz@pobox.com>
331 • Justin Hunter <justin.d.hunter@gmail.com>
333 • Michael Schout <mschout@gkg.net>
335 • Shlomi Fish <shlomif@shlomifish.org>
337 • Stevan Little <stevan.little@gmail.com>
339 • Stuart A Johnston <saj_git@thecommune.net>
341
343 This software is copyright (c) 2007 by Infinity Interactive, Inc.
344 This is free software; you can redistribute it and/or modify it under
346 the same terms as the Perl 5 programming language system itself.
347perl v5.32.1 2021-03-18 MooseX::Getopt(3pm)