Commit | Line | Data |
ef47fe44 |
1 | package MooseX::Getopt::Basic; |
2 | use Moose::Role; |
3 | |
30ed85f7 |
4 | use MooseX::Getopt::OptionTypeMap; |
5 | use MooseX::Getopt::Meta::Attribute; |
6 | use MooseX::Getopt::Meta::Attribute::NoGetopt; |
7 | use Carp (); |
8 | |
9 | use Getopt::Long (); # GLD uses it anyway, doesn't hurt |
10 | |
11 | our $VERSION = '0.20'; |
12 | our $AUTHORITY = 'cpan:STEVAN'; |
13 | |
14 | has ARGV => (is => 'rw', isa => 'ArrayRef', metaclass => "NoGetopt"); |
15 | has extra_argv => (is => 'rw', isa => 'ArrayRef', metaclass => "NoGetopt"); |
16 | |
17 | # _getopt_spec() and _getoptions() are overrided by MooseX::Getopt::GLD. |
18 | |
ef47fe44 |
19 | sub _getopt_spec { |
20 | my ($class, %params) = @_; |
21 | return $class->_traditional_spec(%params) |
22 | } |
23 | |
24 | sub _get_options { |
25 | my ($class, undef, $opt_spec) = @_; |
26 | my %options; |
27 | Getopt::Long::GetOptions(\%options, @$opt_spec); |
28 | return ( \%options, undef ); |
29 | } |
30 | |
30ed85f7 |
31 | sub new_with_options { |
32 | my ($class, @params) = @_; |
33 | |
34 | my $config_from_file; |
35 | if($class->meta->does_role('MooseX::ConfigFromFile')) { |
36 | local @ARGV = @ARGV; |
37 | |
38 | my $configfile; |
39 | my $opt_parser = Getopt::Long::Parser->new( config => [ qw( pass_through ) ] ); |
40 | $opt_parser->getoptions( "configfile=s" => \$configfile ); |
41 | |
42 | if(!defined $configfile) { |
43 | my $cfmeta = $class->meta->find_attribute_by_name('configfile'); |
44 | $configfile = $cfmeta->default if $cfmeta->has_default; |
45 | } |
46 | |
47 | if(defined $configfile) { |
48 | $config_from_file = $class->get_config_from_file($configfile); |
49 | } |
50 | } |
51 | |
52 | my $constructor_params = ( @params == 1 ? $params[0] : {@params} ); |
53 | |
54 | Carp::croak("Single parameters to new_with_options() must be a HASH ref") |
55 | unless ref($constructor_params) eq 'HASH'; |
56 | |
57 | my %processed = $class->_parse_argv( |
58 | options => [ |
59 | $class->_attrs_to_options( $config_from_file ) |
60 | ], |
61 | params => $constructor_params, |
62 | ); |
63 | |
64 | my $params = $config_from_file ? { %$config_from_file, %{$processed{params}} } : $processed{params}; |
65 | |
66 | # did the user request usage information? |
67 | if ( $processed{usage} && ($params->{'?'} or $params->{help} or $params->{usage}) ) |
68 | { |
69 | $processed{usage}->die(); |
70 | } |
71 | |
72 | $class->new( |
73 | ARGV => $processed{argv_copy}, |
74 | extra_argv => $processed{argv}, |
75 | %$constructor_params, # explicit params to ->new |
76 | %$params, # params from CLI |
77 | ); |
78 | } |
79 | |
80 | sub _parse_argv { |
81 | my ( $class, %params ) = @_; |
82 | |
83 | local @ARGV = @{ $params{params}{argv} || \@ARGV }; |
84 | |
85 | my ( $opt_spec, $name_to_init_arg ) = $class->_getopt_spec(%params); |
86 | |
87 | # Get a clean copy of the original @ARGV |
88 | my $argv_copy = [ @ARGV ]; |
89 | |
90 | my @err; |
91 | |
92 | my ( $parsed_options, $usage ) = eval { |
93 | local $SIG{__WARN__} = sub { push @err, @_ }; |
94 | |
95 | return $class->_get_options(\%params, $opt_spec); |
96 | }; |
97 | |
98 | die join "", grep { defined } @err, $@ if @err or $@; |
99 | |
100 | # Get a copy of the Getopt::Long-mangled @ARGV |
101 | my $argv_mangled = [ @ARGV ]; |
102 | |
103 | my %constructor_args = ( |
104 | map { |
105 | $name_to_init_arg->{$_} => $parsed_options->{$_} |
106 | } keys %$parsed_options, |
107 | ); |
108 | |
109 | return ( |
110 | params => \%constructor_args, |
111 | argv_copy => $argv_copy, |
112 | argv => $argv_mangled, |
113 | ( defined($usage) ? ( usage => $usage ) : () ), |
114 | ); |
115 | } |
116 | |
117 | sub _usage_format { |
118 | return "usage: %c %o"; |
119 | } |
120 | |
121 | sub _traditional_spec { |
122 | my ( $class, %params ) = @_; |
123 | |
124 | my ( @options, %name_to_init_arg, %options ); |
125 | |
126 | foreach my $opt ( @{ $params{options} } ) { |
127 | push @options, $opt->{opt_string}; |
128 | |
129 | my $identifier = $opt->{name}; |
130 | $identifier =~ s/\W/_/g; # Getopt::Long does this to all option names |
131 | |
132 | $name_to_init_arg{$identifier} = $opt->{init_arg}; |
133 | } |
134 | |
135 | return ( \@options, \%name_to_init_arg ); |
136 | } |
137 | |
30ed85f7 |
138 | sub _compute_getopt_attrs { |
139 | my $class = shift; |
140 | grep { |
141 | $_->does("MooseX::Getopt::Meta::Attribute::Trait") |
142 | or |
143 | $_->name !~ /^_/ |
144 | } grep { |
145 | !$_->does('MooseX::Getopt::Meta::Attribute::Trait::NoGetopt') |
146 | } $class->meta->get_all_attributes |
147 | } |
148 | |
149 | sub _get_cmd_flags_for_attr { |
150 | my ( $class, $attr ) = @_; |
151 | |
152 | my $flag = $attr->name; |
153 | |
154 | my @aliases; |
155 | |
156 | if ($attr->does('MooseX::Getopt::Meta::Attribute::Trait')) { |
157 | $flag = $attr->cmd_flag if $attr->has_cmd_flag; |
158 | @aliases = @{ $attr->cmd_aliases } if $attr->has_cmd_aliases; |
159 | } |
160 | |
161 | return ( $flag, @aliases ); |
162 | } |
163 | |
164 | sub _attrs_to_options { |
165 | my $class = shift; |
166 | my $config_from_file = shift || {}; |
167 | |
168 | my @options; |
169 | |
170 | foreach my $attr ($class->_compute_getopt_attrs) { |
171 | my ( $flag, @aliases ) = $class->_get_cmd_flags_for_attr($attr); |
172 | |
173 | my $opt_string = join(q{|}, $flag, @aliases); |
174 | |
175 | if ($attr->name eq 'configfile') { |
176 | $opt_string .= '=s'; |
177 | } |
178 | elsif ($attr->has_type_constraint) { |
179 | my $type = $attr->type_constraint; |
180 | if (MooseX::Getopt::OptionTypeMap->has_option_type($type)) { |
181 | $opt_string .= MooseX::Getopt::OptionTypeMap->get_option_type($type) |
182 | } |
183 | } |
184 | |
185 | push @options, { |
186 | name => $flag, |
187 | init_arg => $attr->init_arg, |
188 | opt_string => $opt_string, |
189 | required => $attr->is_required && !$attr->has_default && !$attr->has_builder && !exists $config_from_file->{$attr->name}, |
190 | # NOTE: |
191 | # this "feature" was breaking because |
192 | # Getopt::Long::Descriptive would return |
193 | # the default value as if it was a command |
194 | # line flag, which would then override the |
195 | # one passed into a constructor. |
196 | # See 100_gld_default_bug.t for an example |
197 | # - SL |
198 | #( ( $attr->has_default && ( $attr->is_default_a_coderef xor $attr->is_lazy ) ) ? ( default => $attr->default({}) ) : () ), |
199 | ( $attr->has_documentation ? ( doc => $attr->documentation ) : () ), |
200 | } |
201 | } |
202 | |
203 | return @options; |
204 | } |
205 | |
206 | no Moose::Role; 1; |
207 | |
ef47fe44 |
208 | 1; |
209 | |
210 | =pod |
211 | |
212 | =head1 NAME |
213 | |
214 | MooseX::Getopt::Basic - role to implement the basic functionality of |
215 | L<MooseX::Getopt> without GLD. |
216 | |
217 | =head1 SYNOPSIS |
218 | |
219 | ## In your class |
220 | package My::App; |
221 | use Moose; |
222 | |
223 | with 'MooseX::Getopt'; |
224 | |
225 | has 'out' => (is => 'rw', isa => 'Str', required => 1); |
226 | has 'in' => (is => 'rw', isa => 'Str', required => 1); |
227 | |
228 | # ... rest of the class here |
229 | |
230 | ## in your script |
231 | #!/usr/bin/perl |
232 | |
233 | use My::App; |
234 | |
235 | my $app = My::App->new_with_options(); |
236 | # ... rest of the script here |
237 | |
238 | ## on the command line |
239 | % perl my_app_script.pl -in file.input -out file.dump |
240 | |
241 | =head1 DESCRIPTION |
242 | |
243 | This is a role which provides an alternate constructor for creating |
244 | objects using parameters passed in from the command line. |
245 | |
246 | This module attempts to DWIM as much as possible with the command line |
247 | params by introspecting your class's attributes. It will use the name |
248 | of your attribute as the command line option, and if there is a type |
249 | constraint defined, it will configure Getopt::Long to handle the option |
250 | accordingly. |
251 | |
252 | You can use the trait L<MooseX::Getopt::Meta::Attribute::Trait> or the |
253 | attribute metaclass L<MooseX::Getopt::Meta::Attribute> to get non-default |
254 | commandline option names and aliases. |
255 | |
256 | You can use the trait L<MooseX::Getopt::Meta::Attribute::Trait::NoGetopt> |
257 | or the attribute metaclass L<MooseX::Getopt::Meta::Attribute::NoGetopt> |
258 | to have C<MooseX::Getopt> ignore your attribute in the commandline options. |
259 | |
260 | By default, attributes which start with an underscore are not given |
261 | commandline argument support, unless the attribute's metaclass is set |
262 | to L<MooseX::Getopt::Meta::Attribute>. If you don't want you accessors |
263 | to have the leading underscore in thier name, you can do this: |
264 | |
265 | # for read/write attributes |
266 | has '_foo' => (accessor => 'foo', ...); |
267 | |
268 | # or for read-only attributes |
269 | has '_bar' => (reader => 'bar', ...); |
270 | |
271 | This will mean that Getopt will not handle a --foo param, but your |
272 | code can still call the C<foo> method. |
273 | |
274 | If your class also uses a configfile-loading role based on |
275 | L<MooseX::ConfigFromFile>, such as L<MooseX::SimpleConfig>, |
276 | L<MooseX::Getopt>'s C<new_with_options> will load the configfile |
277 | specified by the C<--configfile> option (or the default you've |
278 | given for the configfile attribute) for you. |
279 | |
280 | Options specified in multiple places follow the following |
281 | precendence order: commandline overrides configfile, which |
282 | overrides explicit new_with_options parameters. |
283 | |
284 | =head2 Supported Type Constraints |
285 | |
286 | =over 4 |
287 | |
288 | =item I<Bool> |
289 | |
290 | A I<Bool> type constraint is set up as a boolean option with |
291 | Getopt::Long. So that this attribute description: |
292 | |
293 | has 'verbose' => (is => 'rw', isa => 'Bool'); |
294 | |
295 | would translate into C<verbose!> as a Getopt::Long option descriptor, |
296 | which would enable the following command line options: |
297 | |
298 | % my_script.pl --verbose |
299 | % my_script.pl --noverbose |
300 | |
301 | =item I<Int>, I<Float>, I<Str> |
302 | |
303 | These type constraints are set up as properly typed options with |
304 | Getopt::Long, using the C<=i>, C<=f> and C<=s> modifiers as appropriate. |
305 | |
306 | =item I<ArrayRef> |
307 | |
308 | An I<ArrayRef> type constraint is set up as a multiple value option |
309 | in Getopt::Long. So that this attribute description: |
310 | |
311 | has 'include' => ( |
312 | is => 'rw', |
313 | isa => 'ArrayRef', |
314 | default => sub { [] } |
315 | ); |
316 | |
317 | would translate into C<includes=s@> as a Getopt::Long option descriptor, |
318 | which would enable the following command line options: |
319 | |
320 | % my_script.pl --include /usr/lib --include /usr/local/lib |
321 | |
322 | =item I<HashRef> |
323 | |
324 | A I<HashRef> type constraint is set up as a hash value option |
325 | in Getopt::Long. So that this attribute description: |
326 | |
327 | has 'define' => ( |
328 | is => 'rw', |
329 | isa => 'HashRef', |
330 | default => sub { {} } |
331 | ); |
332 | |
333 | would translate into C<define=s%> as a Getopt::Long option descriptor, |
334 | which would enable the following command line options: |
335 | |
336 | % my_script.pl --define os=linux --define vendor=debian |
337 | |
338 | =back |
339 | |
340 | =head2 Custom Type Constraints |
341 | |
342 | It is possible to create custom type constraint to option spec |
343 | mappings if you need them. The process is fairly simple (but a |
344 | little verbose maybe). First you create a custom subtype, like |
345 | so: |
346 | |
347 | subtype 'ArrayOfInts' |
348 | => as 'ArrayRef' |
349 | => where { scalar (grep { looks_like_number($_) } @$_) }; |
350 | |
351 | Then you register the mapping, like so: |
352 | |
353 | MooseX::Getopt::OptionTypeMap->add_option_type_to_map( |
354 | 'ArrayOfInts' => '=i@' |
355 | ); |
356 | |
357 | Now any attribute declarations using this type constraint will |
358 | get the custom option spec. So that, this: |
359 | |
360 | has 'nums' => ( |
361 | is => 'ro', |
362 | isa => 'ArrayOfInts', |
363 | default => sub { [0] } |
364 | ); |
365 | |
366 | Will translate to the following on the command line: |
367 | |
368 | % my_script.pl --nums 5 --nums 88 --nums 199 |
369 | |
370 | This example is fairly trivial, but more complex validations are |
371 | easily possible with a little creativity. The trick is balancing |
372 | the type constraint validations with the Getopt::Long validations. |
373 | |
374 | Better examples are certainly welcome :) |
375 | |
376 | =head2 Inferred Type Constraints |
377 | |
378 | If you define a custom subtype which is a subtype of one of the |
379 | standard L</Supported Type Constraints> above, and do not explicitly |
380 | provide custom support as in L</Custom Type Constraints> above, |
381 | MooseX::Getopt will treat it like the parent type for Getopt |
382 | purposes. |
383 | |
384 | For example, if you had the same custom C<ArrayOfInts> subtype |
385 | from the examples above, but did not add a new custom option |
386 | type for it to the C<OptionTypeMap>, it would be treated just |
387 | like a normal C<ArrayRef> type for Getopt purposes (that is, |
388 | C<=s@>). |
389 | |
390 | =head1 METHODS |
391 | |
392 | =over 4 |
393 | |
394 | =item B<new_with_options (%params)> |
395 | |
396 | This method will take a set of default C<%params> and then collect |
397 | params from the command line (possibly overriding those in C<%params>) |
398 | and then return a newly constructed object. |
399 | |
400 | The special parameter C<argv>, if specified should point to an array |
401 | reference with an array to use instead of C<@ARGV>. |
402 | |
ef47fe44 |
403 | If L<Getopt::Long/GetOptions> fails (due to invalid arguments), |
404 | C<new_with_options> will throw an exception. |
405 | |
406 | If L<Getopt::Long::Descriptive> is installed and any of the following |
407 | command line params are passed, the program will exit with usage |
408 | information. You can add descriptions for each option by including a |
409 | B<documentation> option for each attribute to document. |
410 | |
411 | --? |
412 | --help |
413 | --usage |
414 | |
415 | If you have L<Getopt::Long::Descriptive> a the C<usage> param is also passed to |
416 | C<new>. |
417 | |
418 | =item B<ARGV> |
419 | |
420 | This accessor contains a reference to a copy of the C<@ARGV> array |
421 | as it originally existed at the time of C<new_with_options>. |
422 | |
423 | =item B<extra_argv> |
424 | |
425 | This accessor contains an arrayref of leftover C<@ARGV> elements that |
426 | L<Getopt::Long> did not parse. Note that the real C<@ARGV> is left |
427 | un-mangled. |
428 | |
429 | =item B<meta> |
430 | |
431 | This returns the role meta object. |
432 | |
433 | =back |
434 | |
435 | =head1 BUGS |
436 | |
437 | All complex software has bugs lurking in it, and this module is no |
438 | exception. If you find a bug please either email me, or add the bug |
439 | to cpan-RT. |
440 | |
441 | =head1 AUTHOR |
442 | |
443 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
444 | |
445 | Brandon L. Black, E<lt>blblack@gmail.comE<gt> |
446 | |
447 | Yuval Kogman, E<lt>nothingmuch@woobling.orgE<gt> |
448 | |
449 | =head1 CONTRIBUTORS |
450 | |
451 | Ryan D Johnson, E<lt>ryan@innerfence.comE<gt> |
452 | |
453 | Drew Taylor, E<lt>drew@drewtaylor.comE<gt> |
454 | |
455 | =head1 COPYRIGHT AND LICENSE |
456 | |
457 | Copyright 2007-2008 by Infinity Interactive, Inc. |
458 | |
459 | L<http://www.iinteractive.com> |
460 | |
461 | This library is free software; you can redistribute it and/or modify |
462 | it under the same terms as Perl itself. |
463 | |
464 | =cut |
465 | |