Re: getopts and -?

[kejohm]

Have a look at using the Getopt::Long module, specifically this.

Update: Link fixed.

[viffer]

Thank you for your response, however having looked at that, I can't see how I can combine the other options with the "help|?"

I presume I need to define an $opt_help variable, but can't see how I can combine the

getopts('dhlLio:P:pqrv:c');

with

#GetOptions ("help|?");

patently

GetOptions ("help|?dhlLio:P:pqrv:c");

doesn't do it!

[kejohm]

The parameters passed to the Getopt::Long::GetOptions() function are different to the Getopt::Std::getopts() function. One way to call GetOptions() is to pass a hash with the keys specifying each option, and the values specifying a reference to a variable that will be set. Here is an example based on your code:

our ( $opt_d,$opt_h,$opt_l,$opt_L,$opt_i,$opt_o,$opt_P,$opt_p,
  $opt_q,$opt_r,$opt_v,$opt_c,$opt_help );
GetOptions(
    'd'      => \$opt_d,
    'h'      => \$opt_h,
    'l'      => \$opt_l,
    'L'      => \$opt_L,
    'i'      => \$opt_i,
    'o=s'    => \$opt_s,
    'P=s'    => \$opt_P,
    'p'      => \$opt_p,
    'q'      => \$opt_q,
    'r'      => \$opt_r,
    'v=s'    => \$opt_v,
    'c'      => \$opt_c,
    'help|?' => \$opt_help,
);

Since your code has a lot of options, you may want to look at storing the options in a hash, rather than individual variables. Check out the Getopt::Long manpage for more info.

[JavaFan]

Why package variables? my works as well, and you can even write:

GetOptions(
    d  =>  \my $opt_d,
    h  =>  \my $opt_h,
    l  =>  \my $opt_l,
    ...
) or die "Failed to parse options";

[Anonymous Monk]

Getopt::Long doesn't work exactly like Getopt::Std, like I showed, so use

GetOption(
    'd=s' => $opt_d, # d
    'h=s' => $opt_h, # h
    'l=s' => $opt_l, # l
    'L=s' => $opt_L, # L
    'i=s' => $opt_i, # i
    'o!' => $opt_o, # o:
    'P!' => $opt_P, # P:
    'p=s' => $opt_p, # p
    'q=s' => $opt_q, # q
    'r=s' => $opt_r, # r
    'v!' => $opt_v, # v:
    'c=s' => $opt_c, # c
)

or

GetOption( %h,#values in %h
    'd=s', # d
    'h=s', # h
    'l=s', # l
    'L=s', # L
    'i=s', # i
    'o!', # o:
    'P!', # P:
    'p=s', # p
    'q=s', # q
    'r=s', # r
    'v!', # v:
    'c=s', # c
)

generated with

#!/usr/bin/perl --

use strict;
use warnings;

Main( @ARGV );
exit( 0 );
sub Main {
    StdToLong('dhlLio:P:pqrv:c');
}

BEGIN {
    my %Flags = (
#~         ':' => '', # boolean, default
        ':' => '!', # boolean, explicit, negatable
        '' => '=s',
    );
    sub StdToLong {
        StdToLong1(@_);
        StdToLong2(@_);
    }
    sub StdToLong1 {
        print "GetOption(\n";
        while( $_[0] =~ m/(\w)(\W)?/g ){
            no warnings 'uninitialized';
            print qq[    '$1$Flags{$2}' => \$opt_$1, # $1$2 \n];
        }
        print "\)\n";
    }
    sub StdToLong2 {
        print "GetOption( \%h,#values in %h\n";
        while( $_[0] =~ m/(\w)(\W)?/g ){
            no warnings 'uninitialized';
            print qq[    '$1$Flags{$2}', # $1$2 \n];
        }
        print "\)\n";
    }
}
__END__