Update: I've written Module::CheckDeps and checkdeps, so you can use them instead of this script.

Hi everybody. I needed a simple way to check script's dependencies.

Searching on PerlMonks I found two scripts (Check a script's module dependencies and robustly list any Perl code's module dependencies) but I think a better way to achieve that would be using the Module::ExtractUse module, so I wrote my version.

#!/usr/bin/perl

# Usage: checkdeps.pl SCRIPT
# Check Perl script's dependencies

use Module::ExtractUse;

use strict;

my $script = $ARGV[0] or die "Usage: $0 SCRIPT\n";

open SCRIPT, $script or die "$!\n";
my $code = join "", <SCRIPT>;
close SCRIPT;

my $p = Module::ExtractUse -> new;
$p -> extract_use(\$code);

my @used = $p -> array;

foreach my $module(@used) {
        eval "use $module";
        next if !$@;
        print $module."\n";
}
[download]

It simply prints every modules not yet installed (one per line) on which the script depends, ready to feed the cpan script.

For example:

$ cpan `perl checkdeps.pl somescript.pl`

Any hints about the code?

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