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#============================================================================
#
# AppConfig::Getopt.pm
#
# Perl5 module to interface AppConfig::* to Johan Vromans' Getopt::Long
# module. Getopt::Long implements the POSIX standard for command line
# options, with GNU extensions, and also traditional one-letter options.
# AppConfig::Getopt constructs the necessary Getopt:::Long configuration
# from the internal AppConfig::State and delegates the parsing of command
# line arguments to it. Internal variable values are updated by callback
# from GetOptions().
#
# Written by Andy Wardley <abw@wardley.org>
#
# Copyright (C) 1997-2007 Andy Wardley. All Rights Reserved.
# Copyright (C) 1997,1998 Canon Research Centre Europe Ltd.
#
#============================================================================
package AppConfig::Getopt;
use 5.006;
use strict;
use warnings;
use AppConfig::State;
use Getopt::Long 2.17;
our $VERSION = '1.71';
#------------------------------------------------------------------------
# new($state, \@args)
#
# Module constructor. The first, mandatory parameter should be a
# reference to an AppConfig::State object to which all actions should
# be applied. The second parameter may be a reference to a list of
# command line arguments. This list reference is passed to parse() for
# processing.
#
# Returns a reference to a newly created AppConfig::Getopt object.
#------------------------------------------------------------------------
sub new {
my $class = shift;
my $state = shift;
my $self = {
STATE => $state,
};
bless $self, $class;
# call parse() to parse any arg list passed
$self->parse(@_)
if @_;
return $self;
}
#------------------------------------------------------------------------
# parse(@$config, \@args)
#
# Constructs the appropriate configuration information and then delegates
# the task of processing command line options to Getopt::Long.
#
# Returns 1 on success or 0 if one or more warnings were raised.
#------------------------------------------------------------------------
sub parse {
my $self = shift;
my $state = $self->{ STATE };
my (@config, $args, $getopt);
local $" = ', ';
# we trap $SIG{__WARN__} errors and patch them into AppConfig::State
local $SIG{__WARN__} = sub {
my $msg = shift;
# AppConfig::State doesn't expect CR terminated error messages
# and it uses printf, so we protect any embedded '%' chars
chomp($msg);
$state->_error("%s", $msg);
};
# slurp all config items into @config
push(@config, shift) while defined $_[0] && ! ref($_[0]);
# add debug status if appropriate (hmm...can't decide about this)
# push(@config, 'debug') if $state->_debug();
# next parameter may be a reference to a list of args
$args = shift;
# copy any args explicitly specified into @ARGV
@ARGV = @$args if defined $args;
# we enclose in an eval block because constructor may die()
eval {
# configure Getopt::Long
Getopt::Long::Configure(@config);
# construct options list from AppConfig::State variables
my @opts = $self->{ STATE }->_getopt_state();
# DEBUG
if ($state->_debug()) {
print STDERR "Calling GetOptions(@opts)\n";
print STDERR "\@ARGV = (@ARGV)\n";
};
# call GetOptions() with specifications constructed from the state
$getopt = GetOptions(@opts);
};
if ($@) {
chomp($@);
$state->_error("%s", $@);
return 0;
}
# udpdate any args reference passed to include only that which is left
# in @ARGV
@$args = @ARGV if defined $args;
return $getopt;
}
#========================================================================
# AppConfig::State
#========================================================================
package AppConfig::State;
#------------------------------------------------------------------------
# _getopt_state()
#
# Constructs option specs in the Getopt::Long format for each variable
# definition.
#
# Returns a list of specification strings.
#------------------------------------------------------------------------
sub _getopt_state {
my $self = shift;
my ($var, $spec, $args, $argcount, @specs);
my $linkage = sub { $self->set(@_) };
foreach $var (keys %{ $self->{ VARIABLE } }) {
$spec = join('|', $var, @{ $self->{ ALIASES }->{ $var } || [ ] });
# an ARGS value is used, if specified
unless (defined ($args = $self->{ ARGS }->{ $var })) {
# otherwise, construct a basic one from ARGCOUNT
ARGCOUNT: {
last ARGCOUNT unless
defined ($argcount = $self->{ ARGCOUNT }->{ $var });
$args = "=s", last ARGCOUNT if $argcount eq ARGCOUNT_ONE;
$args = "=s@", last ARGCOUNT if $argcount eq ARGCOUNT_LIST;
$args = "=s%", last ARGCOUNT if $argcount eq ARGCOUNT_HASH;
$args = "!";
}
}
$spec .= $args if defined $args;
push(@specs, $spec, $linkage);
}
return @specs;
}
1;
__END__
=head1 NAME
AppConfig::Getopt - Perl5 module for processing command line arguments via delegation to Getopt::Long.
=head1 SYNOPSIS
use AppConfig::Getopt;
my $state = AppConfig::State->new(\%cfg);
my $getopt = AppConfig::Getopt->new($state);
$getopt->parse(\@args); # read args
=head1 OVERVIEW
AppConfig::Getopt is a Perl5 module which delegates to Johan Vroman's
Getopt::Long module to parse command line arguments and update values
in an AppConfig::State object accordingly.
AppConfig::Getopt is distributed as part of the AppConfig bundle.
=head1 DESCRIPTION
=head2 USING THE AppConfig::Getopt MODULE
To import and use the AppConfig::Getopt module the following line should appear
in your Perl script:
use AppConfig::Getopt;
AppConfig::Getopt is used automatically if you use the AppConfig module
and create an AppConfig::Getopt object through the getopt() method.
AppConfig::Getopt is implemented using object-oriented methods. A new
AppConfig::Getopt object is created and initialised using the new() method.
This returns a reference to a new AppConfig::Getopt object. A reference to
an AppConfig::State object should be passed in as the first parameter:
my $state = AppConfig::State->new();
my $getopt = AppConfig::Getopt->new($state);
This will create and return a reference to a new AppConfig::Getopt object.
=head2 PARSING COMMAND LINE ARGUMENTS
The C<parse()> method is used to read a list of command line arguments and
update the state accordingly.
The first (non-list reference) parameters may contain a number of
configuration strings to pass to Getopt::Long::Configure. A reference
to a list of arguments may additionally be passed or @ARGV is used by
default.
$getopt->parse(); # uses @ARGV
$getopt->parse(\@myargs);
$getopt->parse(qw(auto_abbrev debug)); # uses @ARGV
$getopt->parse(qw(debug), \@myargs);
See Getopt::Long for details of the configuartion options available.
A Getopt::Long specification string is constructed for each variable
defined in the AppConfig::State. This consists of the name, any aliases
and the ARGS value for the variable.
These specification string are then passed to Getopt::Long, the arguments
are parsed and the values in the AppConfig::State updated.
See AppConfig for information about using the AppConfig::Getopt
module via the getopt() method.
=head1 AUTHOR
Andy Wardley, E<lt>abw@wardley.orgE<gt>
=head1 COPYRIGHT
Copyright (C) 1997-2007 Andy Wardley. All Rights Reserved.
Copyright (C) 1997,1998 Canon Research Centre Europe Ltd.
This module is free software; you can redistribute it and/or modify it
under the same terms as Perl itself.
=head1 ACKNOWLEDGMENTS
Many thanks are due to Johan Vromans for the Getopt::Long module. He was
kind enough to offer assistance and access to early releases of his code to
enable this module to be written.
=head1 SEE ALSO
AppConfig, AppConfig::State, AppConfig::Args, Getopt::Long
=cut
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