X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FMooseX%2FGetopt%2FBasic.pm;h=9ef96ba2144ac7303a0ef4728e1d01b5206d3d41;hb=94c4db8f1964c733727b413556c46c922d3fa6eb;hp=33d90ef94b9af35d355e2d402c35ec21bb656907;hpb=ef47fe440114bcfc790464f79e476ef7defb0a67;p=gitmo%2FMooseX-Getopt.git diff --git a/lib/MooseX/Getopt/Basic.pm b/lib/MooseX/Getopt/Basic.pm index 33d90ef..9ef96ba 100644 --- a/lib/MooseX/Getopt/Basic.pm +++ b/lib/MooseX/Getopt/Basic.pm @@ -1,276 +1,262 @@ package MooseX::Getopt::Basic; -use Moose::Role; +# ABSTRACT: MooseX::Getopt::Basic - role to implement the Getopt::Long functionality -sub _getopt_spec { - my ($class, %params) = @_; - return $class->_traditional_spec(%params) -} +use Moose::Role; -sub _get_options { - my ($class, undef, $opt_spec) = @_; - my %options; - Getopt::Long::GetOptions(\%options, @$opt_spec); - return ( \%options, undef ); +use MooseX::Getopt::OptionTypeMap; +use MooseX::Getopt::Meta::Attribute; +use MooseX::Getopt::Meta::Attribute::NoGetopt; +use Carp (); + +use Getopt::Long 2.37 (); + +has ARGV => (is => 'rw', isa => 'ArrayRef', metaclass => "NoGetopt"); +has extra_argv => (is => 'rw', isa => 'ArrayRef', metaclass => "NoGetopt"); + +sub new_with_options { + my ($class, @params) = @_; + + my $config_from_file; + if($class->meta->does_role('MooseX::ConfigFromFile')) { + local @ARGV = @ARGV; + + # just get the configfile arg now; the rest of the args will be + # fetched later + my $configfile; + my $opt_parser = Getopt::Long::Parser->new( config => [ qw( no_auto_help pass_through ) ] ); + $opt_parser->getoptions( "configfile=s" => \$configfile ); + + if(!defined $configfile) { + my $cfmeta = $class->meta->find_attribute_by_name('configfile'); + $configfile = $cfmeta->default if $cfmeta->has_default; + if (ref $configfile eq 'CODE') { + # not sure theres a lot you can do with the class and may break some assumptions + # warn? + $configfile = &$configfile($class); + } + if (defined $configfile) { + $config_from_file = eval { + $class->get_config_from_file($configfile); + }; + if ($@) { + die $@ unless $@ =~ /Specified configfile '\Q$configfile\E' does not exist/; + } + } + } + else { + $config_from_file = $class->get_config_from_file($configfile); + } + } + + my $constructor_params = ( @params == 1 ? $params[0] : {@params} ); + + Carp::croak("Single parameters to new_with_options() must be a HASH ref") + unless ref($constructor_params) eq 'HASH'; + + my %processed = $class->_parse_argv( + options => [ + $class->_attrs_to_options( $config_from_file ) + ], + params => $constructor_params, + ); + + my $params = $config_from_file ? { %$config_from_file, %{$processed{params}} } : $processed{params}; + + # did the user request usage information? + if ( $processed{usage} && ($params->{'?'} or $params->{help} or $params->{usage}) ) + { + $class->_getopt_full_usage($processed{usage}); + } + + $class->new( + ARGV => $processed{argv_copy}, + extra_argv => $processed{argv}, + %$constructor_params, # explicit params to ->new + %$params, # params from CLI + ); } -1; - -=pod - -=head1 NAME - -MooseX::Getopt::Basic - role to implement the basic functionality of -L without GLD. - -=head1 SYNOPSIS - - ## In your class - package My::App; - use Moose; - - with 'MooseX::Getopt'; - - has 'out' => (is => 'rw', isa => 'Str', required => 1); - has 'in' => (is => 'rw', isa => 'Str', required => 1); - - # ... rest of the class here - - ## in your script - #!/usr/bin/perl - - use My::App; - - my $app = My::App->new_with_options(); - # ... rest of the script here - - ## on the command line - % perl my_app_script.pl -in file.input -out file.dump - -=head1 DESCRIPTION - -This is a role which provides an alternate constructor for creating -objects using parameters passed in from the command line. - -This module attempts to DWIM as much as possible with the command line -params by introspecting your class's attributes. It will use the name -of your attribute as the command line option, and if there is a type -constraint defined, it will configure Getopt::Long to handle the option -accordingly. - -You can use the trait L or the -attribute metaclass L to get non-default -commandline option names and aliases. - -You can use the trait L -or the attribute metaclass L -to have C ignore your attribute in the commandline options. - -By default, attributes which start with an underscore are not given -commandline argument support, unless the attribute's metaclass is set -to L. If you don't want you accessors -to have the leading underscore in thier name, you can do this: - - # for read/write attributes - has '_foo' => (accessor => 'foo', ...); - - # or for read-only attributes - has '_bar' => (reader => 'bar', ...); - -This will mean that Getopt will not handle a --foo param, but your -code can still call the C method. - -If your class also uses a configfile-loading role based on -L, such as L, -L's C will load the configfile -specified by the C<--configfile> option (or the default you've -given for the configfile attribute) for you. - -Options specified in multiple places follow the following -precendence order: commandline overrides configfile, which -overrides explicit new_with_options parameters. - -=head2 Supported Type Constraints - -=over 4 - -=item I +sub _getopt_spec { shift->_traditional_spec(@_); } -A I type constraint is set up as a boolean option with -Getopt::Long. So that this attribute description: +sub _parse_argv { + my ( $class, %params ) = @_; - has 'verbose' => (is => 'rw', isa => 'Bool'); + local @ARGV = @{ $params{params}{argv} || \@ARGV }; -would translate into C as a Getopt::Long option descriptor, -which would enable the following command line options: + my ( $opt_spec, $name_to_init_arg ) = $class->_getopt_spec(%params); - % my_script.pl --verbose - % my_script.pl --noverbose + # Get a clean copy of the original @ARGV + my $argv_copy = [ @ARGV ]; -=item I, I, I + my @warnings; + my ( $parsed_options, $usage ) = eval { + local $SIG{__WARN__} = sub { push @warnings, @_ }; -These type constraints are set up as properly typed options with -Getopt::Long, using the C<=i>, C<=f> and C<=s> modifiers as appropriate. + return $class->_getopt_get_options(\%params, $opt_spec); + }; -=item I + $class->_getopt_spec_warnings(@warnings) if @warnings; + $class->_getopt_spec_exception(\@warnings, $@) if $@; -An I type constraint is set up as a multiple value option -in Getopt::Long. So that this attribute description: + # Get a copy of the Getopt::Long-mangled @ARGV + my $argv_mangled = [ @ARGV ]; - has 'include' => ( - is => 'rw', - isa => 'ArrayRef', - default => sub { [] } - ); + my %constructor_args = ( + map { + $name_to_init_arg->{$_} => $parsed_options->{$_} + } keys %$parsed_options, + ); -would translate into C as a Getopt::Long option descriptor, -which would enable the following command line options: - - % my_script.pl --include /usr/lib --include /usr/local/lib - -=item I - -A I type constraint is set up as a hash value option -in Getopt::Long. So that this attribute description: - - has 'define' => ( - is => 'rw', - isa => 'HashRef', - default => sub { {} } - ); - -would translate into C as a Getopt::Long option descriptor, -which would enable the following command line options: - - % my_script.pl --define os=linux --define vendor=debian - -=back - -=head2 Custom Type Constraints - -It is possible to create custom type constraint to option spec -mappings if you need them. The process is fairly simple (but a -little verbose maybe). First you create a custom subtype, like -so: - - subtype 'ArrayOfInts' - => as 'ArrayRef' - => where { scalar (grep { looks_like_number($_) } @$_) }; - -Then you register the mapping, like so: - - MooseX::Getopt::OptionTypeMap->add_option_type_to_map( - 'ArrayOfInts' => '=i@' - ); - -Now any attribute declarations using this type constraint will -get the custom option spec. So that, this: - - has 'nums' => ( - is => 'ro', - isa => 'ArrayOfInts', - default => sub { [0] } - ); - -Will translate to the following on the command line: - - % my_script.pl --nums 5 --nums 88 --nums 199 - -This example is fairly trivial, but more complex validations are -easily possible with a little creativity. The trick is balancing -the type constraint validations with the Getopt::Long validations. - -Better examples are certainly welcome :) - -=head2 Inferred Type Constraints + return ( + params => \%constructor_args, + argv_copy => $argv_copy, + argv => $argv_mangled, + ( defined($usage) ? ( usage => $usage ) : () ), + ); +} -If you define a custom subtype which is a subtype of one of the -standard L above, and do not explicitly -provide custom support as in L above, -MooseX::Getopt will treat it like the parent type for Getopt -purposes. +sub _getopt_get_options { + my ($class, $params, $opt_spec) = @_; + my %options; + Getopt::Long::GetOptions(\%options, @$opt_spec); + return ( \%options, undef ); +} -For example, if you had the same custom C subtype -from the examples above, but did not add a new custom option -type for it to the C, it would be treated just -like a normal C type for Getopt purposes (that is, -C<=s@>). +sub _getopt_spec_warnings { } -=head1 METHODS +sub _getopt_spec_exception { + my ($self, $warnings, $exception) = @_; + die @$warnings, $exception; +} -=over 4 +sub _getopt_full_usage { + my ($self, $usage) = @_; + $usage->die; +} -=item B +sub _usage_format { + return "usage: %c %o"; +} -This method will take a set of default C<%params> and then collect -params from the command line (possibly overriding those in C<%params>) -and then return a newly constructed object. +sub _traditional_spec { + my ( $class, %params ) = @_; -The special parameter C, if specified should point to an array -reference with an array to use instead of C<@ARGV>. + my ( @options, %name_to_init_arg, %options ); -The paramater C, if specified and a true value will disable -the use of L . + foreach my $opt ( @{ $params{options} } ) { + push @options, $opt->{opt_string}; -If L fails (due to invalid arguments), -C will throw an exception. + my $identifier = $opt->{name}; + $identifier =~ s/\W/_/g; # Getopt::Long does this to all option names -If L is installed and any of the following -command line params are passed, the program will exit with usage -information. You can add descriptions for each option by including a -B option for each attribute to document. + $name_to_init_arg{$identifier} = $opt->{init_arg}; + } - --? - --help - --usage + return ( \@options, \%name_to_init_arg ); +} -If you have L a the C param is also passed to -C. +sub _compute_getopt_attrs { + my $class = shift; + grep { + $_->does("MooseX::Getopt::Meta::Attribute::Trait") + or + $_->name !~ /^_/ + } grep { + !$_->does('MooseX::Getopt::Meta::Attribute::Trait::NoGetopt') + } $class->meta->get_all_attributes +} -=item B +sub _get_cmd_flags_for_attr { + my ( $class, $attr ) = @_; -This accessor contains a reference to a copy of the C<@ARGV> array -as it originally existed at the time of C. + my $flag = $attr->name; -=item B + my @aliases; -This accessor contains an arrayref of leftover C<@ARGV> elements that -L did not parse. Note that the real C<@ARGV> is left -un-mangled. + if ($attr->does('MooseX::Getopt::Meta::Attribute::Trait')) { + $flag = $attr->cmd_flag if $attr->has_cmd_flag; + @aliases = @{ $attr->cmd_aliases } if $attr->has_cmd_aliases; + } -=item B + return ( $flag, @aliases ); +} -This returns the role meta object. +sub _attrs_to_options { + my $class = shift; + my $config_from_file = shift || {}; + + my @options; + + foreach my $attr ($class->_compute_getopt_attrs) { + my ( $flag, @aliases ) = $class->_get_cmd_flags_for_attr($attr); + + my $opt_string = join(q{|}, $flag, @aliases); + + if ($attr->name eq 'configfile') { + $opt_string .= '=s'; + } + elsif ($attr->has_type_constraint) { + my $type = $attr->type_constraint; + if (MooseX::Getopt::OptionTypeMap->has_option_type($type)) { + $opt_string .= MooseX::Getopt::OptionTypeMap->get_option_type($type) + } + } + + push @options, { + name => $flag, + init_arg => $attr->init_arg, + opt_string => $opt_string, + required => $attr->is_required && !$attr->has_default && !$attr->has_builder && !exists $config_from_file->{$attr->name}, + # NOTE: + # this "feature" was breaking because + # Getopt::Long::Descriptive would return + # the default value as if it was a command + # line flag, which would then override the + # one passed into a constructor. + # See 100_gld_default_bug.t for an example + # - SL + #( ( $attr->has_default && ( $attr->is_default_a_coderef xor $attr->is_lazy ) ) ? ( default => $attr->default({}) ) : () ), + ( $attr->has_documentation ? ( doc => $attr->documentation ) : () ), + } + } + + return @options; +} -=back +no Moose::Role; +1; -=head1 BUGS +=head1 SYNOPSIS -All complex software has bugs lurking in it, and this module is no -exception. If you find a bug please either email me, or add the bug -to cpan-RT. + ## In your class + package My::App; + use Moose; -=head1 AUTHOR + with 'MooseX::Getopt::Basic'; -Stevan Little Estevan@iinteractive.comE + has 'out' => (is => 'rw', isa => 'Str', required => 1); + has 'in' => (is => 'rw', isa => 'Str', required => 1); -Brandon L. Black, Eblblack@gmail.comE + # ... rest of the class here -Yuval Kogman, Enothingmuch@woobling.orgE + ## in your script + #!/usr/bin/perl -=head1 CONTRIBUTORS + use My::App; -Ryan D Johnson, Eryan@innerfence.comE + my $app = My::App->new_with_options(); + # ... rest of the script here -Drew Taylor, Edrew@drewtaylor.comE + ## on the command line + % perl my_app_script.pl --in file.input --out file.dump -=head1 COPYRIGHT AND LICENSE +=head1 DESCRIPTION -Copyright 2007-2008 by Infinity Interactive, Inc. +This is like L and can be used instead except that it +doesn't make use of L (or "GLD" for short). -L +=method new_with_options -This library is free software; you can redistribute it and/or modify -it under the same terms as Perl itself. +See L. =cut -