package Smart::Options;
use strict;
use warnings;
use 5.010001;
our $VERSION = '0.02';
require Exporter;
our @ISA = qw(Exporter);
our @EXPORT = qw(argv);
use List::MoreUtils qw(uniq);
use Text::Table;
sub new {
my $pkg = shift;
my %opt = @_;
my $self = bless {
alias => {},
default => {},
boolean => {},
demand => {},
usage => "Usage: $0",
describe => {},
subcmd => {},
}, $pkg;
if ($opt{add_help} // 1) {
$self->options(h => {
alias => 'help',
describe => 'show help',
});
$self->{add_help} = 1;
}
$self;
}
sub argv {
Smart::Options->new->parse(@_);
}
sub _set {
my $self = shift;
my $param = shift;
my %args = @_;
for my $option (keys %args) {
$self->{$param}->{$option} = $args{$option};
}
$self;
}
sub alias { shift->_set('alias', @_) }
sub default { shift->_set('default', @_) }
sub describe { shift->_set('describe', @_) }
sub subcmd { shift->_set('subcmd', @_) }
sub _set_flag {
my $self = shift;
my $param = shift;
for my $option (@_) {
$self->{$param}->{$option} = 1;
}
$self;
}
sub boolean { shift->_set_flag('boolean', @_) }
sub demand { shift->_set_flag('demand', @_) }
sub options {
my $self = shift;
my %args = @_;
while (my($opt, $setting) = each %args) {
for my $key (keys %$setting) {
$self->$key($opt, $setting->{$key});
}
}
$self;
}
sub usage { $_[0]->{usage} = $_[1]; $_[0] }
sub _get_opt_desc {
my ($self, $option) = @_;
my @opts = ($option);
while ( my($opt, $val) = each %{$self->{alias}} ) {
push @opts, $opt if $val eq $option;
}
return join(', ', map { (length($_) == 1 ? '-' : '--') . $_ } sort @opts);
}
sub _get_describe {
my ($self, $option) = @_;
my $desc = $self->{describe}->{$option};
while ( my($opt, $val) = each %{$self->{alias}} ) {
$desc ||= $self->{describe}->{$opt} if $val eq $option;
}
return $desc ? ucfirst($desc) : '';
}
sub _get_default {
my ($self, $option) = @_;
my $value = $self->{default}->{$option};
while ( my($opt, $val) = each %{$self->{alias}} ) {
$value ||= $self->{default}->{$opt} if $val eq $option;
}
$value;
}
sub help {
my $self = shift;
my $alias = $self->{alias};
my $demand = $self->{demand};
my $describe = $self->{describe};
my $default = $self->{default};
my $boolean = $self->{boolean};
my $help = $self->{usage} . "\n";
if (scalar(keys %$demand) or scalar(keys %$describe)) {
my @opts;
for my $opt (uniq sort keys %$demand, keys %$describe, keys %$default, keys %$boolean, values %$alias) {
next if $alias->{$opt};
push @opts, [
$self->_get_opt_desc($opt),
$self->_get_describe($opt),
$boolean->{$opt} ? '[boolean]' : '',
$demand->{$opt} ? '[required]' : '',
$self->_get_default($opt) ? "[default: @{[$self->_get_default($opt)]}]" : '',
];
}
my $sep = \' ';
$help .= "\nOptions:\n";
$help .= Text::Table->new( $sep, '', $sep, '', $sep, '', $sep, '', $sep, '' )
->load(@opts)->stringify . "\n";
if (keys %{$self->{subcmd}}) {
$help .= "Implemented commands are:\n";
$help .= " " . join(', ', sort keys %{$self->{subcmd}}) . "\n\n";
}
}
$help;
}
sub showHelp {
my ($self, $fh) = @_;
$fh //= *STDERR;
print $fh $self->help;
}
sub _set_v2a {
my ($argv, $key, $value) = @_;
if (exists $argv->{$key}) {
if (ref($argv->{$key})) {
push @{$argv->{$key}}, $value;
}
else {
$argv->{$key} = [ $argv->{$key}, $value ];
}
}
else {
$argv->{$key} = $value;
}
}
sub _get_real_name {
my ($self, $opt) = @_;
while (my $name = $self->{alias}->{$opt}) {
$opt = $name;
}
return $opt;
}
sub parse {
my $self = shift;
push @_, @ARGV unless @_;
my $argv = {};
my @args;
my $boolean = $self->{boolean};
my $key;
my $stop = 0;
for my $arg (@_) {
if ($stop) {
push @args, $arg;
next;
}
if ($arg =~ /^--((?:\w|-)+)=(.+)$/) {
my $option = $self->_get_real_name($1);
_set_v2a($argv, $option, $2);
}
elsif ($arg =~ /^(-(\w(?:\w|-)*)|--((?:\w|-)+))$/) {
if ($key) {
$argv->{$key} = 1;
}
my $opt = $2 // $3;
my $option = $self->_get_real_name($opt);
if ($boolean->{$option}) {
$argv->{$option} = 1;
}
else {
$key = $option;
}
}
elsif ($arg =~ /^--$/) {
# stop parsing
$stop = 1;
next;
}
else {
if ($key) {
_set_v2a($argv, $key, $arg);
$key = undef; # reset
}
else {
if (!scalar(@args) && keys %{$self->{subcmd}}) {
if ( $self->{subcmd}->{$arg} ) {
$argv->{command} = $arg;
$stop = 1;
next;
}
else {
die "sub command '$arg' not defined.";
}
}
push @args, $arg;
}
}
}
if ($key) {
$argv->{$key} = 1;
}
if (my $parser = $self->{subcmd}->{$argv->{command}||''}) {
$argv->{cmd_option} = $parser->parse(@args);
} else {
$argv->{_} = \@args;
}
while (my ($key, $val) = each %{$self->{default}}) {
if (ref($val) && ref($val) eq 'CODE') {
$argv->{$key} //= $val->();
}
else {
$argv->{$key} //= $val;
}
}
for my $opt (keys %{$self->{demand}}) {
if (!$argv->{$opt}) {
$self->showHelp;
print STDERR "\nMissing required arguments: $opt\n";
die;
}
}
if ($argv->{help} && $self->{add_help}) {
$self->showHelp;
die;
}
$argv;
}
1;
__END__
=encoding utf8
=head1 NAME
Smart::Options - smart command line options processor
=head1 SYNOPSIS
use Smart::Options;
my $argv = Smart::Options->new->argv;
if ($argv->{rif} - 5 * $argv->{xup} > 7.138) {
say 'Buy more fiffiwobbles';
}
else {
say 'Sell the xupptumblers';
}
# $ ./example.pl --rif=55 --xup=9.52
# Buy more fiffiwobbles
#
# $ ./example.pl --rif 12 --xup 8.1
# Sell the xupptumblers
=head1 DESCRIPTION
Smart::Options is a library for option parsing for people tired option parsing.
This module is analyzed as people interpret an option intuitively.
=head1 METHOD
=head2 new()
Create a parser object.
use Smart::Options;
my $argv = Smart::Options->new->parse(qw(-x 10 -y 2));
=head2 parse(@args)
parse @args. return hashref of option values.
if @args is empty Smart::Options use @ARGV
=head2 argv(@args)
shortcut method. this method auto export.
use Smart::Options;
say argv(qw(-x 10))->{x};
is the same as
use Smart::Options ();
Smart::Options->new->parse(qw(-x 10))->{x};
=head2 alias($alias, $option)
set alias for option. you can use "$option" field of argv.
use Smart::Options;
my $argv = Smart::Options->new->alias(f => 'file')->parse(qw(-f /etc/hosts));
$argv->{file} # => '/etc/hosts'
=head2 default($option, $default_value)
set default value for option.
use Smart::Options;
my $argv = Smart::Options->new->default(y => 5)->parse(qw(-x 10));
$argv->{x} + $argv->{y} # => 15
=head2 describe($option, $msg)
set option help message.
use Smart::Options;
my $opt = Smart::Options->new()->alias(f => 'file')->describe('Load a file');
say $opt->help;
# Usage: ./example.pl
#
# Options:
# -f, --file Load a file
#
=head2 boolean($option, $option2, ...)
interpret 'option' as a boolean.
use Smart::Options;
my $argv = Smart::Options->new->parse(qw(-x 11 -y 10));
$argv->{x} # => 11
my $argv2 = Smart::Options->new->boolean('x')->parse(qw(-x 11 -y 10));
$argv2->{x} # => true (1)
=head2 demand($option, $option2, ...)
show usage (showHelp()) and exit if $option wasn't specified in args.
use Smart::Options;
my $opt = Smart::Options->new()->alias(f => 'file')
->demand('file')
->describe('Load a file');
$opt->argv(); # => exit
# Usage: ./example.pl
#
# Options:
# -f, --file Load a file [required]
#
=head2 options($key => $settings, ...)
use Smart::Options;
my $opt = Smart::Options->new()
->options( f => { alias => 'file', default => '/etc/passwd' } );
is the same as
use Smart::Options;
my $opt = Smart::Options->new()
->alias(f => 'file')
->default(f => '/etc/passwd');
=head2 usage
set a usage message to show which command to use. default is "Usage: $0".
=head2 help
return help message string
=head2 showHelp($fh)
print usage message. default output STDERR.
=head2 subcmd($cmd => $parser)
set a sub command. $parser is another Smart::Option object.
use Smart::Options;
my $opt = Smart::Options->new()
->subcmd(add => Smart::Options->new())
->subcmd(minus => Smart::Options->new());
=head1 DSL
see also L<Smart::Options::Declare>
=head1 PARSING TRICKS
=head2 stop parsing
use '--' to stop parsing.
use Smart::Options;
use Data::Dumper;
my $argv = argv(qw(-a 1 -b 2 -- -c 3 -d 4));
warn Dumper($argv);
# $VAR1 = {
# 'a' => '1',
# 'b' => '2',
# '_' => [
# '-c',
# '3',
# '-d',
# '4'
# ]
# };
=head2 negate fields
'--no-key' set false to $key.
use Smart::Options;
argv(qw(-a --no-b))->{b}; # => 0
=head2 duplicates
If set flag multiple times it will get arrayref.
use Smart::Options;
argv(qw(-x 1 -x 2 -x 3))->{x}; # => [1, 2, 3]
=head1 AUTHOR
Kan Fushihara E<lt>kan.fushihara@gmail.comE<gt>
=head1 SEE ALSO
https://github.com/substack/node-optimist
L<GetOpt::Casual>, L<opts>, L<GetOpt::Compat::WithCmd>
=head1 LICENSE
Copyright (C) Kan Fushihara
This library is free software; you can redistribute it and/or modify
it under the same terms as Perl itself.
=cut