try to use Module in Perl and print message if module not available

Question

Hi,

I wanted to be able to do this in Perl (the code below is Python lol)

try:
  import Module
except:
  print "You need module Module to run this program."

Does anyone have any idea how to?

Answer 1

TIMTOWTDI:

eval "use Module; 1" or die "you need Module to run this program".

or

require Module or die "you need Module to run this program";
Module->import;

or

use Module::Load;

eval { load Module; 1 } or die "you need Module to run this program";

You can find Module::Load on CPAN.

Answer 2

You can use Module::Load::Conditional

use Module::Load::Conditional qw[can_load check_install requires];


my $use_list = {
    CPANPLUS     => 0.05,
    LWP          => 5.60,
    'Test::More' => undef,
};

if(can_load( modules => $use_list )) 
{
   print 'all modules loaded successfully';
} 
else 
{
   print 'failed to load required modules';
}

Answer 3

use strict;
use warnings;
use Module;

If you don't have Module installed, you will get the error "Can't locate Module.pm in @INC (@INC contains: ...)." which is understandable enough.

Is there some particular reason you want/need a more specific message?

Answer 4

Something like this, use Net::SMTP if you have the module installed, or a cheesy sendmail callout as a last resort.

my $mailmethod = eval "use Net::SMTP; 1" ? 'perl' : 'sendmail';