Passing data to Getopt::Long

[neilwatson]

Greetings, Is the following possible? I'm making a template for future scripts and programs. I thought it would be useful to separate the standard cli args (man, help, usage, etc) to a separate package. My first try returns an error. Why?

#!/usr/bin/perl

use strict;
use warnings;
use feature 'say';
use Getopt::Long;
use Pod::Usage;
use Data::Dumper;

my $VERSION = 1;

# Get standard options from reusable module
my $stdopts = Std::Opts->new();
my $std_cli_arg_ref = $stdopts->get_standard_args;

# Read, process, and validate cli args
my $cli_arg_ref;
GetOptions(
   $cli_arg_ref,
   $std_cli_arg_ref,

   # These two samples can be removed
   'myarg=s',
   'arg2=i',
);

#
# Modules
#
package Std::Opts;

use strict;
use warnings;

sub new {
   my ( $class ) = @_;
   return bless {}, $class;
}

sub get_standard_args {
   my $self = shift;

   my $std_cli_arg_ref = {
      'version'  => sub { say $VERSION; exit                          
+  },
      'test'     => sub { _run_tests(); exit                          
+  },
      'man'      => sub { pod2usage( -verbose => 2, -exitval => 0 )   
+  },

      'dumpargs' => sub {
         say '$cli_arg_ref = '. Dumper( $cli_arg_ref ); exit
      },
      'help|?'   => sub {
         pod2usage( -sections => ['OPTIONS'],  -exitval => 0, -verbose
+ => 99)
      },
      'usage'    => sub {
         pod2usage( -sections => ['SYNOPSIS'], -exitval => 0, -verbose
+ => 99)
      },
      'examples' => sub {
         pod2usage( -sections => 'EXAMPLES',   -exitval => 0, -verbose
+ => 99)
      },
   };

   return $std_cli_arg_ref;
}

1;

Returns:
$ ./foo.pl -du
Undefined argument in option spec
Error in option spec: "HASH(0x1772fc8)"

[1nickt]

Pass hashes instead of hashrefs to GetOptions.

#!/usr/bin/perl

use strict;
use warnings;
use feature 'say';
use Getopt::Long;
use Pod::Usage;
use Data::Dumper;

my $VERSION = 1;

# Get standard options from reusable module
my $stdopts = Std::Opts->new();
my $std_cli_arg_ref = $stdopts->get_standard_args;

# Read, process, and validate cli args
my %cli_arg_ref;
GetOptions(
   %cli_arg_ref,
   %{ $std_cli_arg_ref },

   # These two samples can be removed
   'myarg=s',
   'arg2=i',
);

#
# Modules
#
package Std::Opts;

use strict;
use warnings;

sub new {
   my ( $class ) = @_;
   return bless {}, $class;
}

sub get_standard_args {
   my $self = shift;

   my $std_cli_arg_ref = {
      'version'  => sub { say $VERSION; exit                          
+  },
      'test'     => sub { _run_tests(); exit                          
+  },
      'man'      => sub { pod2usage( -verbose => 2, -exitval => 0 )   
+  },

      'dumpargs' => sub {
         say '%cli_arg_ref = '. Dumper( \%cli_arg_ref ); exit
      },
      'help|?'   => sub {
         pod2usage( -sections => ['OPTIONS'],  -exitval => 0, -verbose
+ => 99)
      },
      'usage'    => sub {
         pod2usage( -sections => ['SYNOPSIS'], -exitval => 0, -verbose
+ => 99)
      },
      'examples' => sub {
         pod2usage( -sections => 'EXAMPLES',   -exitval => 0, -verbose
+ => 99)
      },
   };

   return $std_cli_arg_ref;
}

1;

[17:39][nick:~/monks]$ perl 1136681.pl --version
1

[Laurent_R]

Hi Neil,

yes, you could do something like that, but why not call Getopt::Long directly? I do not see much added value in having an intermediate layer here.

[Anonymous Monk]

Greetings, Is the following possible?

Yeah but why? Why have your OOPY module return stuff to pass to GetOpt? It should be calling GetOpt directly

See Getopt::Long::Descriptive , thats the marriage ... but don't return read-only objects (useless)