Commit | Line | Data |
5dac17c3 |
1 | |
2 | package MooseX::Getopt; |
3 | use Moose::Role; |
4 | |
f63e6310 |
5 | use Getopt::Long (); |
5dac17c3 |
6 | |
8034a232 |
7 | use MooseX::Getopt::OptionTypeMap; |
5dac17c3 |
8 | use MooseX::Getopt::Meta::Attribute; |
9 | |
26be7f7e |
10 | our $VERSION = '0.06'; |
8034a232 |
11 | our $AUTHORITY = 'cpan:STEVAN'; |
12 | |
f63e6310 |
13 | has ARGV => (is => 'rw', isa => 'ArrayRef'); |
14 | has extra_argv => (is => 'rw', isa => 'ArrayRef'); |
3899e5df |
15 | |
5dac17c3 |
16 | sub new_with_options { |
17 | my ($class, %params) = @_; |
18 | |
26be7f7e |
19 | my %processed = $class->_parse_argv( |
20 | options => [ |
21 | $class->_attrs_to_options( %params ) |
22 | ] |
23 | ); |
ee211848 |
24 | |
25 | $class->new( |
26 | ARGV => $processed{argv_copy}, |
27 | extra_argv => $processed{argv}, |
28 | %params, # explicit params to ->new |
29 | %{ $processed{params} }, # params from CLI |
30 | ); |
31 | } |
32 | |
33 | sub _parse_argv { |
34 | my ( $class, %params ) = @_; |
35 | |
36 | local @ARGV = @{ $params{argv} || \@ARGV }; |
37 | |
38 | my ( @options, %name_to_init_arg, %options ); |
39 | |
40 | foreach my $opt ( @{ $params{options} } ) { |
41 | push @options, $opt->{opt_string}; |
42 | $name_to_init_arg{ $opt->{name} } = $opt->{init_arg}; |
43 | } |
44 | |
45 | # Get a clean copy of the original @ARGV |
46 | my $argv_copy = [ @ARGV ]; |
47 | |
48 | { |
49 | local $SIG{__WARN__} = sub { die $_[0] }; |
50 | Getopt::Long::GetOptions(\%options, @options); |
51 | } |
52 | |
53 | # Get a copy of the Getopt::Long-mangled @ARGV |
54 | my $argv_mangled = [ @ARGV ]; |
55 | |
56 | return ( |
57 | argv_copy => $argv_copy, |
58 | argv => $argv_mangled, |
59 | params => { |
60 | map { |
61 | $name_to_init_arg{$_} => $options{$_} |
62 | } keys %options, |
63 | } |
64 | ); |
65 | } |
66 | |
67 | sub _attrs_to_options { |
68 | my $class = shift; |
69 | |
70 | my @options; |
71 | |
5dac17c3 |
72 | foreach my $attr ($class->meta->compute_all_applicable_attributes) { |
73 | my $name = $attr->name; |
3899e5df |
74 | |
de75868f |
75 | my $aliases; |
76 | |
77 | if ($attr->isa('MooseX::Getopt::Meta::Attribute')) { |
78 | $name = $attr->cmd_flag if $attr->has_cmd_flag; |
79 | $aliases = $attr->cmd_aliases if $attr->has_cmd_aliases; |
3899e5df |
80 | } |
81 | else { |
82 | next if $name =~ /^_/; |
83 | } |
ee211848 |
84 | |
de75868f |
85 | my $opt_string = $aliases |
86 | ? join(q{|}, $name, @$aliases) |
87 | : $name; |
88 | |
5dac17c3 |
89 | if ($attr->has_type_constraint) { |
90 | my $type_name = $attr->type_constraint->name; |
8034a232 |
91 | if (MooseX::Getopt::OptionTypeMap->has_option_type($type_name)) { |
de75868f |
92 | $opt_string .= MooseX::Getopt::OptionTypeMap->get_option_type($type_name); |
5dac17c3 |
93 | } |
94 | } |
f63e6310 |
95 | |
ee211848 |
96 | push @options, { |
97 | name => $name, |
98 | init_arg => $attr->init_arg, |
99 | opt_string => $opt_string, |
100 | required => $attr->is_required, |
101 | ( $attr->has_documentation ? ( doc => $attr->documentation ) : () ), |
102 | } |
f63e6310 |
103 | } |
104 | |
ee211848 |
105 | return @options; |
5dac17c3 |
106 | } |
107 | |
8034a232 |
108 | no Moose::Role; 1; |
5dac17c3 |
109 | |
110 | __END__ |
111 | |
112 | =pod |
113 | |
114 | =head1 NAME |
115 | |
8034a232 |
116 | MooseX::Getopt - A Moose role for processing command line options |
5dac17c3 |
117 | |
118 | =head1 SYNOPSIS |
119 | |
120 | ## In your class |
121 | package My::App; |
122 | use Moose; |
123 | |
124 | with 'MooseX::Getopt'; |
125 | |
126 | has 'out' => (is => 'rw', isa => 'Str', required => 1); |
127 | has 'in' => (is => 'rw', isa => 'Str', required => 1); |
128 | |
129 | # ... rest of the class here |
130 | |
131 | ## in your script |
132 | #!/usr/bin/perl |
133 | |
134 | use My::App; |
135 | |
136 | my $app = My::App->new_with_options(); |
137 | # ... rest of the script here |
138 | |
139 | ## on the command line |
140 | % perl my_app_script.pl -in file.input -out file.dump |
141 | |
142 | =head1 DESCRIPTION |
143 | |
8034a232 |
144 | This is a role which provides an alternate constructor for creating |
145 | objects using parameters passed in from the command line. |
146 | |
147 | This module attempts to DWIM as much as possible with the command line |
148 | params by introspecting your class's attributes. It will use the name |
149 | of your attribute as the command line option, and if there is a type |
150 | constraint defined, it will configure Getopt::Long to handle the option |
3899e5df |
151 | accordingly. |
152 | |
153 | You can use the attribute metaclass L<MooseX::Getopt::Meta::Attribute> |
154 | to get non-default commandline option names and aliases. |
155 | |
156 | By default, attributes which start with an underscore are not given |
157 | commandline argument support, unless the attribute's metaclass is set |
3d9a716d |
158 | to L<MooseX::Getopt::Meta::Attribute>. If you don't want you accessors |
159 | to have the leading underscore in thier name, you can do this: |
160 | |
161 | # for read/write attributes |
162 | has '_foo' => (accessor => 'foo', ...); |
163 | |
164 | # or for read-only attributes |
165 | has '_bar' => (reader => 'bar', ...); |
166 | |
167 | This will mean that Getopt will not handle a --foo param, but your |
168 | code can still call the C<foo> method. |
8034a232 |
169 | |
170 | =head2 Supported Type Constraints |
171 | |
172 | =over 4 |
173 | |
174 | =item I<Bool> |
175 | |
176 | A I<Bool> type constraint is set up as a boolean option with |
177 | Getopt::Long. So that this attribute description: |
178 | |
179 | has 'verbose' => (is => 'rw', isa => 'Bool'); |
180 | |
181 | would translate into C<verbose!> as a Getopt::Long option descriptor, |
182 | which would enable the following command line options: |
183 | |
184 | % my_script.pl --verbose |
185 | % my_script.pl --noverbose |
186 | |
187 | =item I<Int>, I<Float>, I<Str> |
188 | |
189 | These type constraints are set up as properly typed options with |
190 | Getopt::Long, using the C<=i>, C<=f> and C<=s> modifiers as appropriate. |
191 | |
192 | =item I<ArrayRef> |
193 | |
194 | An I<ArrayRef> type constraint is set up as a multiple value option |
195 | in Getopt::Long. So that this attribute description: |
196 | |
197 | has 'include' => ( |
198 | is => 'rw', |
199 | isa => 'ArrayRef', |
200 | default => sub { [] } |
201 | ); |
202 | |
203 | would translate into C<includes=s@> as a Getopt::Long option descriptor, |
204 | which would enable the following command line options: |
205 | |
206 | % my_script.pl --include /usr/lib --include /usr/local/lib |
207 | |
208 | =item I<HashRef> |
209 | |
210 | A I<HashRef> type constraint is set up as a hash value option |
211 | in Getopt::Long. So that this attribute description: |
212 | |
213 | has 'define' => ( |
214 | is => 'rw', |
215 | isa => 'HashRef', |
216 | default => sub { {} } |
217 | ); |
218 | |
219 | would translate into C<define=s%> as a Getopt::Long option descriptor, |
220 | which would enable the following command line options: |
221 | |
222 | % my_script.pl --define os=linux --define vendor=debian |
223 | |
224 | =back |
225 | |
226 | =head2 Custom Type Constraints |
227 | |
228 | It is possible to create custom type constraint to option spec |
229 | mappings if you need them. The process is fairly simple (but a |
230 | little verbose maybe). First you create a custom subtype, like |
231 | so: |
232 | |
233 | subtype 'ArrayOfInts' |
234 | => as 'ArrayRef' |
235 | => where { scalar (grep { looks_like_number($_) } @$_) }; |
236 | |
237 | Then you register the mapping, like so: |
238 | |
239 | MooseX::Getopt::OptionTypeMap->add_option_type_to_map( |
240 | 'ArrayOfInts' => '=i@' |
241 | ); |
242 | |
243 | Now any attribute declarations using this type constraint will |
244 | get the custom option spec. So that, this: |
245 | |
246 | has 'nums' => ( |
247 | is => 'ro', |
248 | isa => 'ArrayOfInts', |
249 | default => sub { [0] } |
250 | ); |
251 | |
252 | Will translate to the following on the command line: |
253 | |
254 | % my_script.pl --nums 5 --nums 88 --nums 199 |
255 | |
256 | This example is fairly trivial, but more complex validations are |
257 | easily possible with a little creativity. The trick is balancing |
258 | the type constraint validations with the Getopt::Long validations. |
259 | |
260 | Better examples are certainly welcome :) |
261 | |
f63e6310 |
262 | =head2 Inferred Type Constraints |
263 | |
264 | If you define a custom subtype which is a subtype of one of the |
265 | standard L</Supported Type Constraints> above, and do not explicitly |
266 | provide custom support as in L</Custom Type Constraints> above, |
267 | MooseX::Getopt will treat it like the parent type for Getopt |
268 | purposes. |
269 | |
270 | For example, if you had the same custom C<ArrayOfInts> subtype |
271 | from the examples above, but did not add a new custom option |
272 | type for it to the C<OptionTypeMap>, it would be treated just |
273 | like a normal C<ArrayRef> type for Getopt purposes (that is, |
274 | C<=s@>). |
275 | |
5dac17c3 |
276 | =head1 METHODS |
277 | |
278 | =over 4 |
279 | |
280 | =item B<new_with_options (%params)> |
281 | |
8034a232 |
282 | This method will take a set of default C<%params> and then collect |
283 | params from the command line (possibly overriding those in C<%params>) |
284 | and then return a newly constructed object. |
285 | |
f63e6310 |
286 | If L<Getopt::Long/GetOptions> fails (due to invalid arguments), |
287 | C<new_with_options> will throw an exception. |
288 | |
3899e5df |
289 | =item B<ARGV> |
290 | |
291 | This accessor contains a reference to a copy of the C<@ARGV> array |
f63e6310 |
292 | as it originally existed at the time of C<new_with_options>. |
293 | |
294 | =item B<extra_argv> |
295 | |
296 | This accessor contains an arrayref of leftover C<@ARGV> elements that |
297 | L<Getopt::Long> did not parse. Note that the real C<@ARGV> is left |
298 | un-mangled. |
3899e5df |
299 | |
5dac17c3 |
300 | =item B<meta> |
301 | |
8034a232 |
302 | This returns the role meta object. |
303 | |
5dac17c3 |
304 | =back |
305 | |
306 | =head1 BUGS |
307 | |
308 | All complex software has bugs lurking in it, and this module is no |
309 | exception. If you find a bug please either email me, or add the bug |
310 | to cpan-RT. |
311 | |
312 | =head1 AUTHOR |
313 | |
314 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
315 | |
e2911e34 |
316 | Brandon L. Black, E<lt>blblack@gmail.comE<gt> |
317 | |
5dac17c3 |
318 | =head1 COPYRIGHT AND LICENSE |
319 | |
320 | Copyright 2007 by Infinity Interactive, Inc. |
321 | |
322 | L<http://www.iinteractive.com> |
323 | |
324 | This library is free software; you can redistribute it and/or modify |
325 | it under the same terms as Perl itself. |
326 | |
327 | =cut |