Check script's dependencies

[alexbio]

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";
}

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?

[runrig]

There is also Module-ScanDeps.

[alexbio]

I tried the scandeps.pl script, but it takes a lot of time (also with the '-R' option active) and its output is not what I needed.

Also the module is quite slow, so I found Module::ExtractUse more appropriate because of its "lightness".

[Khen1950fx]

Interesting, but it doesn't work for me. I added Data::Dumper and took out the foreach and replaced it with print Dumper($p->used); Now it works for me.

#!/usr/bin/perl

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

use strict;
use warnings;
use Module::ExtractUse;
use YAML;
use YAML::Dumper;

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 $dumper = YAML::Dumper->new;
$dumper->indent_width(4);

my @used = $p->array;
print $dumper->dump($p->used);

[alexbio]

Thank you for your help, but I think your code lost the main features I needed: the test on every module to check if it is installed and the "formatted output".

I really don't understand what's wrong in my code, I tested it on both Linux (perl 5.10.1) and Windows XP (the latest strawberry perl). Has anyone more experienced than me any ideas?

[Anonymous Monk]

Might want to call it CheckUninstalledModules.pl