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1 | |
2 | package MooseX::Getopt; |
3 | use Moose::Role; |
4 | |
5 | use Getopt::Long; |
6 | |
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7 | use MooseX::Getopt::OptionTypeMap; |
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8 | use MooseX::Getopt::Meta::Attribute; |
9 | |
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10 | our $VERSION = '0.02'; |
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11 | our $AUTHORITY = 'cpan:STEVAN'; |
12 | |
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13 | has ARGV => (is => 'rw', isa => 'ArrayRef'); |
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14 | |
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15 | sub new_with_options { |
16 | my ($class, %params) = @_; |
17 | |
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18 | my (@options, %name_to_init_arg); |
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19 | foreach my $attr ($class->meta->compute_all_applicable_attributes) { |
20 | my $name = $attr->name; |
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21 | |
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22 | my $aliases; |
23 | |
24 | if ($attr->isa('MooseX::Getopt::Meta::Attribute')) { |
25 | $name = $attr->cmd_flag if $attr->has_cmd_flag; |
26 | $aliases = $attr->cmd_aliases if $attr->has_cmd_aliases; |
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27 | } |
28 | else { |
29 | next if $name =~ /^_/; |
30 | } |
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31 | |
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32 | $name_to_init_arg{$name} = $attr->init_arg; |
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33 | |
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34 | my $opt_string = $aliases |
35 | ? join(q{|}, $name, @$aliases) |
36 | : $name; |
37 | |
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38 | if ($attr->has_type_constraint) { |
39 | my $type_name = $attr->type_constraint->name; |
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40 | if (MooseX::Getopt::OptionTypeMap->has_option_type($type_name)) { |
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41 | $opt_string .= MooseX::Getopt::OptionTypeMap->get_option_type($type_name); |
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42 | } |
43 | } |
44 | |
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45 | push @options => $opt_string; |
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46 | } |
47 | |
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48 | my $saved_argv = [ @ARGV ]; |
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49 | my %options; |
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50 | |
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51 | GetOptions(\%options, @options); |
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52 | |
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53 | #use Data::Dumper; |
54 | #warn Dumper \@options; |
55 | #warn Dumper \%name_to_init_arg; |
56 | #warn Dumper \%options; |
57 | |
58 | $class->new( |
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59 | ARGV => $saved_argv, |
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60 | %params, |
61 | map { |
62 | $name_to_init_arg{$_} => $options{$_} |
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63 | } keys %options, |
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64 | ); |
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65 | } |
66 | |
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67 | no Moose::Role; 1; |
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68 | |
69 | __END__ |
70 | |
71 | =pod |
72 | |
73 | =head1 NAME |
74 | |
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75 | MooseX::Getopt - A Moose role for processing command line options |
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76 | |
77 | =head1 SYNOPSIS |
78 | |
79 | ## In your class |
80 | package My::App; |
81 | use Moose; |
82 | |
83 | with 'MooseX::Getopt'; |
84 | |
85 | has 'out' => (is => 'rw', isa => 'Str', required => 1); |
86 | has 'in' => (is => 'rw', isa => 'Str', required => 1); |
87 | |
88 | # ... rest of the class here |
89 | |
90 | ## in your script |
91 | #!/usr/bin/perl |
92 | |
93 | use My::App; |
94 | |
95 | my $app = My::App->new_with_options(); |
96 | # ... rest of the script here |
97 | |
98 | ## on the command line |
99 | % perl my_app_script.pl -in file.input -out file.dump |
100 | |
101 | =head1 DESCRIPTION |
102 | |
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103 | This is a role which provides an alternate constructor for creating |
104 | objects using parameters passed in from the command line. |
105 | |
106 | This module attempts to DWIM as much as possible with the command line |
107 | params by introspecting your class's attributes. It will use the name |
108 | of your attribute as the command line option, and if there is a type |
109 | constraint defined, it will configure Getopt::Long to handle the option |
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110 | accordingly. |
111 | |
112 | You can use the attribute metaclass L<MooseX::Getopt::Meta::Attribute> |
113 | to get non-default commandline option names and aliases. |
114 | |
115 | By default, attributes which start with an underscore are not given |
116 | commandline argument support, unless the attribute's metaclass is set |
117 | to L<MooseX::Getopt::Meta::Attribute>. |
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118 | |
119 | =head2 Supported Type Constraints |
120 | |
121 | =over 4 |
122 | |
123 | =item I<Bool> |
124 | |
125 | A I<Bool> type constraint is set up as a boolean option with |
126 | Getopt::Long. So that this attribute description: |
127 | |
128 | has 'verbose' => (is => 'rw', isa => 'Bool'); |
129 | |
130 | would translate into C<verbose!> as a Getopt::Long option descriptor, |
131 | which would enable the following command line options: |
132 | |
133 | % my_script.pl --verbose |
134 | % my_script.pl --noverbose |
135 | |
136 | =item I<Int>, I<Float>, I<Str> |
137 | |
138 | These type constraints are set up as properly typed options with |
139 | Getopt::Long, using the C<=i>, C<=f> and C<=s> modifiers as appropriate. |
140 | |
141 | =item I<ArrayRef> |
142 | |
143 | An I<ArrayRef> type constraint is set up as a multiple value option |
144 | in Getopt::Long. So that this attribute description: |
145 | |
146 | has 'include' => ( |
147 | is => 'rw', |
148 | isa => 'ArrayRef', |
149 | default => sub { [] } |
150 | ); |
151 | |
152 | would translate into C<includes=s@> as a Getopt::Long option descriptor, |
153 | which would enable the following command line options: |
154 | |
155 | % my_script.pl --include /usr/lib --include /usr/local/lib |
156 | |
157 | =item I<HashRef> |
158 | |
159 | A I<HashRef> type constraint is set up as a hash value option |
160 | in Getopt::Long. So that this attribute description: |
161 | |
162 | has 'define' => ( |
163 | is => 'rw', |
164 | isa => 'HashRef', |
165 | default => sub { {} } |
166 | ); |
167 | |
168 | would translate into C<define=s%> as a Getopt::Long option descriptor, |
169 | which would enable the following command line options: |
170 | |
171 | % my_script.pl --define os=linux --define vendor=debian |
172 | |
173 | =back |
174 | |
175 | =head2 Custom Type Constraints |
176 | |
177 | It is possible to create custom type constraint to option spec |
178 | mappings if you need them. The process is fairly simple (but a |
179 | little verbose maybe). First you create a custom subtype, like |
180 | so: |
181 | |
182 | subtype 'ArrayOfInts' |
183 | => as 'ArrayRef' |
184 | => where { scalar (grep { looks_like_number($_) } @$_) }; |
185 | |
186 | Then you register the mapping, like so: |
187 | |
188 | MooseX::Getopt::OptionTypeMap->add_option_type_to_map( |
189 | 'ArrayOfInts' => '=i@' |
190 | ); |
191 | |
192 | Now any attribute declarations using this type constraint will |
193 | get the custom option spec. So that, this: |
194 | |
195 | has 'nums' => ( |
196 | is => 'ro', |
197 | isa => 'ArrayOfInts', |
198 | default => sub { [0] } |
199 | ); |
200 | |
201 | Will translate to the following on the command line: |
202 | |
203 | % my_script.pl --nums 5 --nums 88 --nums 199 |
204 | |
205 | This example is fairly trivial, but more complex validations are |
206 | easily possible with a little creativity. The trick is balancing |
207 | the type constraint validations with the Getopt::Long validations. |
208 | |
209 | Better examples are certainly welcome :) |
210 | |
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211 | =head1 METHODS |
212 | |
213 | =over 4 |
214 | |
215 | =item B<new_with_options (%params)> |
216 | |
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217 | This method will take a set of default C<%params> and then collect |
218 | params from the command line (possibly overriding those in C<%params>) |
219 | and then return a newly constructed object. |
220 | |
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221 | =item B<ARGV> |
222 | |
223 | This accessor contains a reference to a copy of the C<@ARGV> array |
224 | which was copied before L<Getopt::Long> mangled it, in case you want |
225 | to see your original options. |
226 | |
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227 | =item B<meta> |
228 | |
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229 | This returns the role meta object. |
230 | |
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231 | =back |
232 | |
233 | =head1 BUGS |
234 | |
235 | All complex software has bugs lurking in it, and this module is no |
236 | exception. If you find a bug please either email me, or add the bug |
237 | to cpan-RT. |
238 | |
239 | =head1 AUTHOR |
240 | |
241 | Stevan Little E<lt>stevan@iinteractive.comE<gt> |
242 | |
243 | =head1 COPYRIGHT AND LICENSE |
244 | |
245 | Copyright 2007 by Infinity Interactive, Inc. |
246 | |
247 | L<http://www.iinteractive.com> |
248 | |
249 | This library is free software; you can redistribute it and/or modify |
250 | it under the same terms as Perl itself. |
251 | |
252 | =cut |