Hello fellow monks! I am using the below code in a script and cannot figure out how to automatically run the sub save_config before the script exits (to save any changes in the config hash to the config file). Any help is appreciated.

Code from main cgi file (foo.cgi):

#!/usr/bin/perl

use strict;

eval {
    require Foobar;
    my $self = Foobar->new;
    $SIG{__WARN__} = sub { die @_ };
    $self->run;
};
if ($@) {
    print "content-type: text/html\n\nError: $@";
    exit;
}
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Code from Foobar.pm:

package Foobar;
use strict;

sub new {
    my $self = bless {}, shift;
    $self->init;
}

sub init {
    my $self = shift;
    $self->{build} = 1;
    $self->{version} = '1.0 alpha';
    require CGI;
    $CGI::HEADERS_ONCE = 1;
    $self->{cgi} = CGI->new;
    require fbconfig;
    $self->{cfg} = fbconfig->get; # this is where I load the config fr
+om fbconfig.pm (saved by the sub save_config)
    return $self;
}

sub run {
    # A page handler would go here
}

sub save_config {
    my $self = shift;
    use Data::Dumper;
    $Data::Dumper::Terse = 1;
    open XCFG, '>fbconfig.pm';
    print XCFG "package fbconfig;\n\n";
    print XCFG "sub get {\n    return ", Dumper($self->{cfg}), ";\n\n}
+\n\n1;";
    close XCFG;
}

1;
[download]

Sample fbconfig.pm:

package fbconfig;

sub get {
    return {
          'key' => 'value'
        }
;

}

1;
[download]