Commit | Line | Data |
5dac17c3 |
1 | |
2 | package MooseX::Getopt; |
3 | use Moose::Role; |
4 | |
6bb4cb66 |
5 | use Getopt::Long::Descriptive (); |
5dac17c3 |
6 | |
8034a232 |
7 | use MooseX::Getopt::OptionTypeMap; |
5dac17c3 |
8 | use MooseX::Getopt::Meta::Attribute; |
0f8232b6 |
9 | use MooseX::Getopt::Meta::Attribute::NoGetopt; |
5dac17c3 |
10 | |
384fb15d |
11 | our $VERSION = '0.08'; |
8034a232 |
12 | our $AUTHORITY = 'cpan:STEVAN'; |
13 | |
f63e6310 |
14 | has ARGV => (is => 'rw', isa => 'ArrayRef'); |
15 | has extra_argv => (is => 'rw', isa => 'ArrayRef'); |
3899e5df |
16 | |
5dac17c3 |
17 | sub new_with_options { |
bff3807b |
18 | my ($class, @params) = @_; |
5dac17c3 |
19 | |
26be7f7e |
20 | my %processed = $class->_parse_argv( |
21 | options => [ |
bff3807b |
22 | $class->_attrs_to_options( @params ) |
26be7f7e |
23 | ] |
24 | ); |
ee211848 |
25 | |
ee69c4ba |
26 | my $params = $processed{params}; |
27 | |
28 | if($class->meta->does_role('MooseX::ConfigFromFile') |
29 | && defined $params->{configfile}) { |
30 | %$params = ( |
31 | %{$class->get_config_from_file($params->{configfile})}, |
32 | %$params, |
33 | ); |
34 | } |
35 | |
ee211848 |
36 | $class->new( |
37 | ARGV => $processed{argv_copy}, |
38 | extra_argv => $processed{argv}, |
bff3807b |
39 | @params, # explicit params to ->new |
ee69c4ba |
40 | %$params, # params from CLI |
ee211848 |
41 | ); |
42 | } |
43 | |
44 | sub _parse_argv { |
45 | my ( $class, %params ) = @_; |
46 | |
47 | local @ARGV = @{ $params{argv} || \@ARGV }; |
48 | |
6bb4cb66 |
49 | my ( @options, %name_to_init_arg ); |
ee211848 |
50 | |
51 | foreach my $opt ( @{ $params{options} } ) { |
6bb4cb66 |
52 | push @options, [ |
53 | $opt->{opt_string}, |
54 | $opt->{doc} || ' ', |
55 | { |
56 | ( $opt->{required} ? (required => $opt->{required}) : () ), |
57 | ( exists $opt->{default} ? (default => $opt->{default}) : () ), |
58 | }, |
59 | ]; |
60 | |
ee211848 |
61 | $name_to_init_arg{ $opt->{name} } = $opt->{init_arg}; |
62 | } |
63 | |
64 | # Get a clean copy of the original @ARGV |
65 | my $argv_copy = [ @ARGV ]; |
66 | |
6bb4cb66 |
67 | my @err; |
68 | |
69 | my ( $parsed_options, $usage ) = eval { |
70 | local $SIG{__WARN__} = sub { push @err, @_ }; |
71 | Getopt::Long::Descriptive::describe_options("usage: %c %o", @options) |
72 | }; |
73 | |
74 | die join "", grep { defined } @err, $@ if @err or $@; |
ee211848 |
75 | |
76 | # Get a copy of the Getopt::Long-mangled @ARGV |
77 | my $argv_mangled = [ @ARGV ]; |
78 | |
79 | return ( |
80 | argv_copy => $argv_copy, |
81 | argv => $argv_mangled, |
82 | params => { |
83 | map { |
6bb4cb66 |
84 | $name_to_init_arg{$_} => $parsed_options->{$_} |
85 | } keys %$parsed_options, |
ee211848 |
86 | } |
87 | ); |
88 | } |
89 | |
bff3807b |
90 | sub _compute_getopt_attrs { |
91 | my $class = shift; |
bff3807b |
92 | grep { |
93 | $_->isa("MooseX::Getopt::Meta::Attribute") |
94 | or |
95 | $_->name !~ /^_/ |
96 | && |
0f8232b6 |
97 | !$_->isa('MooseX::Getopt::Meta::Attribute::NoGetopt') |
bff3807b |
98 | } $class->meta->compute_all_applicable_attributes |
99 | } |
100 | |
ee211848 |
101 | sub _attrs_to_options { |
102 | my $class = shift; |
103 | |
104 | my @options; |
105 | |
bff3807b |
106 | foreach my $attr ($class->_compute_getopt_attrs) { |
5dac17c3 |
107 | my $name = $attr->name; |
3899e5df |
108 | |
de75868f |
109 | my $aliases; |
110 | |
111 | if ($attr->isa('MooseX::Getopt::Meta::Attribute')) { |
112 | $name = $attr->cmd_flag if $attr->has_cmd_flag; |
113 | $aliases = $attr->cmd_aliases if $attr->has_cmd_aliases; |
3899e5df |
114 | } |
ee211848 |
115 | |
de75868f |
116 | my $opt_string = $aliases |
117 | ? join(q{|}, $name, @$aliases) |
118 | : $name; |
119 | |
5dac17c3 |
120 | if ($attr->has_type_constraint) { |
121 | my $type_name = $attr->type_constraint->name; |
6bb4cb66 |
122 | if (MooseX::Getopt::OptionTypeMap->has_option_type($type_name)) { |
123 | $opt_string .= MooseX::Getopt::OptionTypeMap->get_option_type($type_name) |
5dac17c3 |
124 | } |
125 | } |
f63e6310 |
126 | |
ee211848 |
127 | push @options, { |
128 | name => $name, |
129 | init_arg => $attr->init_arg, |
130 | opt_string => $opt_string, |
131 | required => $attr->is_required, |
6bb4cb66 |
132 | ( ( $attr->has_default && ( $attr->is_default_a_coderef xor $attr->is_lazy ) ) ? ( default => $attr->default({}) ) : () ), |
ee211848 |
133 | ( $attr->has_documentation ? ( doc => $attr->documentation ) : () ), |
134 | } |
f63e6310 |
135 | } |
136 | |
ee211848 |
137 | return @options; |
5dac17c3 |
138 | } |
139 | |
8034a232 |
140 | no Moose::Role; 1; |
5dac17c3 |
141 | |
142 | __END__ |
143 | |
144 | =pod |
145 | |
146 | =head1 NAME |
147 | |
8034a232 |
148 | MooseX::Getopt - A Moose role for processing command line options |
5dac17c3 |
149 | |
150 | =head1 SYNOPSIS |
151 | |
152 | ## In your class |
153 | package My::App; |
154 | use Moose; |
155 | |
156 | with 'MooseX::Getopt'; |
157 | |
158 | has 'out' => (is => 'rw', isa => 'Str', required => 1); |
159 | has 'in' => (is => 'rw', isa => 'Str', required => 1); |
160 | |
161 | # ... rest of the class here |
162 | |
163 | ## in your script |
164 | #!/usr/bin/perl |
165 | |
166 | use My::App; |
167 | |
168 | my $app = My::App->new_with_options(); |
169 | # ... rest of the script here |
170 | |
171 | ## on the command line |
172 | % perl my_app_script.pl -in file.input -out file.dump |
173 | |
174 | =head1 DESCRIPTION |
175 | |
8034a232 |
176 | This is a role which provides an alternate constructor for creating |
177 | objects using parameters passed in from the command line. |
178 | |
179 | This module attempts to DWIM as much as possible with the command line |
180 | params by introspecting your class's attributes. It will use the name |
181 | of your attribute as the command line option, and if there is a type |
182 | constraint defined, it will configure Getopt::Long to handle the option |
3899e5df |
183 | accordingly. |
184 | |
185 | You can use the attribute metaclass L<MooseX::Getopt::Meta::Attribute> |
186 | to get non-default commandline option names and aliases. |
187 | |
0f8232b6 |
188 | You can use the attribute metaclass L<MooseX::Getopt::Meta::Attribute::NoGetOpt> |
189 | to have C<MooseX::Getopt> ignore your attribute in the commandline options. |
190 | |
3899e5df |
191 | By default, attributes which start with an underscore are not given |
192 | commandline argument support, unless the attribute's metaclass is set |
3d9a716d |
193 | to L<MooseX::Getopt::Meta::Attribute>. If you don't want you accessors |
194 | to have the leading underscore in thier name, you can do this: |
195 | |
196 | # for read/write attributes |
197 | has '_foo' => (accessor => 'foo', ...); |
198 | |
199 | # or for read-only attributes |
200 | has '_bar' => (reader => 'bar', ...); |
201 | |
202 | This will mean that Getopt will not handle a --foo param, but your |
203 | code can still call the C<foo> method. |
8034a232 |
204 | |
ee69c4ba |
205 | If your class also uses a configfile-loading role based on |
206 | L<MooseX::ConfigFromFile>, such as L<MooseX::SimpleConfig>, |
207 | L<MooseX::Getopt>'s C<new_with_options> will load the configfile |
208 | specified by the C<--configfile> option for you. |
209 | |
8034a232 |
210 | =head2 Supported Type Constraints |
211 | |
212 | =over 4 |
213 | |
214 | =item I<Bool> |
215 | |
216 | A I<Bool> type constraint is set up as a boolean option with |
217 | Getopt::Long. So that this attribute description: |
218 | |
219 | has 'verbose' => (is => 'rw', isa => 'Bool'); |
220 | |
221 | would translate into C<verbose!> as a Getopt::Long option descriptor, |
222 | which would enable the following command line options: |
223 | |
224 | % my_script.pl --verbose |
225 | % my_script.pl --noverbose |
226 | |
227 | =item I<Int>, I<Float>, I<Str> |
228 | |
229 | These type constraints are set up as properly typed options with |
230 | Getopt::Long, using the C<=i>, C<=f> and C<=s> modifiers as appropriate. |
231 | |
232 | =item I<ArrayRef> |
233 | |
234 | An I<ArrayRef> type constraint is set up as a multiple value option |
235 | in Getopt::Long. So that this attribute description: |
236 | |
237 | has 'include' => ( |
238 | is => 'rw', |
239 | isa => 'ArrayRef', |
240 | default => sub { [] } |
241 | ); |
242 | |
243 | would translate into C<includes=s@> as a Getopt::Long option descriptor, |
244 | which would enable the following command line options: |
245 | |
246 | % my_script.pl --include /usr/lib --include /usr/local/lib |
247 | |
248 | =item I<HashRef> |
249 | |
250 | A I<HashRef> type constraint is set up as a hash value option |
251 | in Getopt::Long. So that this attribute description: |
252 | |
253 | has 'define' => ( |
254 | is => 'rw', |
255 | isa => 'HashRef', |
256 | default => sub { {} } |
257 | ); |
258 | |
259 | would translate into C<define=s%> as a Getopt::Long option descriptor, |
260 | which would enable the following command line options: |
261 | |
262 | % my_script.pl --define os=linux --define vendor=debian |
263 | |
264 | =back |
265 | |
266 | =head2 Custom Type Constraints |
267 | |
268 | It is possible to create custom type constraint to option spec |
269 | mappings if you need them. The process is fairly simple (but a |
270 | little verbose maybe). First you create a custom subtype, like |
271 | so: |
272 | |
273 | subtype 'ArrayOfInts' |
274 | => as 'ArrayRef' |
275 | => where { scalar (grep { looks_like_number($_) } @$_) }; |
276 | |
277 | Then you register the mapping, like so: |
278 | |
279 | MooseX::Getopt::OptionTypeMap->add_option_type_to_map( |
280 | 'ArrayOfInts' => '=i@' |
281 | ); |
282 | |
283 | Now any attribute declarations using this type constraint will |
284 | get the custom option spec. So that, this: |
285 | |
286 | has 'nums' => ( |
287 | is => 'ro', |
288 | isa => 'ArrayOfInts', |
289 | default => sub { [0] } |
290 | ); |
291 | |
292 | Will translate to the following on the command line: |
293 | |
294 | % my_script.pl --nums 5 --nums 88 --nums 199 |
295 | |
296 | This example is fairly trivial, but more complex validations are |
297 | easily possible with a little creativity. The trick is balancing |
298 | the type constraint validations with the Getopt::Long validations. |
299 | |
300 | Better examples are certainly welcome :) |
301 | |
f63e6310 |
302 | =head2 Inferred Type Constraints |
303 | |
304 | If you define a custom subtype which is a subtype of one of the |
305 | standard L</Supported Type Constraints> above, and do not explicitly |
306 | provide custom support as in L</Custom Type Constraints> above, |
307 | MooseX::Getopt will treat it like the parent type for Getopt |
308 | purposes. |
309 | |
310 | For example, if you had the same custom C<ArrayOfInts> subtype |
311 | from the examples above, but did not add a new custom option |
312 | type for it to the C<OptionTypeMap>, it would be treated just |
313 | like a normal C<ArrayRef> type for Getopt purposes (that is, |
314 | C<=s@>). |
315 | |
5dac17c3 |
316 | =head1 METHODS |
317 | |
318 | =over 4 |
319 | |
320 | =item B<new_with_options (%params)> |
321 | |
8034a232 |
322 | This method will take a set of default C<%params> and then collect |
323 | params from the command line (possibly overriding those in C<%params>) |
324 | and then return a newly constructed object. |
325 | |
f63e6310 |
326 | If L<Getopt::Long/GetOptions> fails (due to invalid arguments), |
327 | C<new_with_options> will throw an exception. |
328 | |
3899e5df |
329 | =item B<ARGV> |
330 | |
331 | This accessor contains a reference to a copy of the C<@ARGV> array |
f63e6310 |
332 | as it originally existed at the time of C<new_with_options>. |
333 | |
334 | =item B<extra_argv> |
335 | |
336 | This accessor contains an arrayref of leftover C<@ARGV> elements that |
337 | L<Getopt::Long> did not parse. Note that the real C<@ARGV> is left |
338 | un-mangled. |
3899e5df |
339 | |
5dac17c3 |
340 | =item B<meta> |
341 | |
8034a232 |
342 | This returns the role meta object. |
343 | |
5dac17c3 |
344 | =back |
345 | |
346 | =head1 BUGS |
347 | |
348 | All complex software has bugs lurking in it, and this module is no |
349 | exception. If you find a bug please either email me, or add the bug |
350 | to cpan-RT. |
351 | |
352 | =head1 AUTHOR |
353 | |
354 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
355 | |
e2911e34 |
356 | Brandon L. Black, E<lt>blblack@gmail.comE<gt> |
357 | |
5dac17c3 |
358 | =head1 COPYRIGHT AND LICENSE |
359 | |
360 | Copyright 2007 by Infinity Interactive, Inc. |
361 | |
362 | L<http://www.iinteractive.com> |
363 | |
364 | This library is free software; you can redistribute it and/or modify |
365 | it under the same terms as Perl itself. |
366 | |
367 | =cut |