NAME

Getopt::EX::Func - Function call interface

SYNOPSIS

            

              
              
use Getopt::EX::Func qw(parse_func);
my $func = parse_func(...);
$func->call;
            
          

DESCRIPTION

This module provides the way to create function call object used in Getopt::EX module set.

If your script has --begin option which tells the script to call specific function at the beginning of execution. You can do it like this:

            

              
              
use Getopt::EX::Func qw(parse_func);
GetOptions("begin:s" => $opt_begin);
my $func = parse_func($opt_begin);
$func->call;
            
          

Then script can be invoked like this:

            

              
              
% example -Mfoo --begin 'repeat(debug,msg=hello,count=2)'
            
          

In this example, function repeat should be declared in module foo or in start up rc file such as ~/.examplerc. Actual function call is done in this way:

            

              
              
repeat ( debug => 1, msg => 'hello', count => '2' );
            
          

As you can notice, arguments in the function call string is passed in name => value style. Parameter without value (debug in this example) is assigned value 1.

Function itself can be implemented like this:

            

              
              
   our @EXPORT = qw(repeat);
   sub repeat {
my %opt = @_;
print Dumper \%opt if $opt{debug};
for (1 .. $opt{count}) {
    say $opt{msg};
}
   }
            
          

It is also possible to declare the function in-line:

            

              
              
% example -Mfoo --begin 'sub{ say "wahoo!!" }'
            
          

Function say can be used because the function is executed under use v5.14 context.