############################################################
#specifica cosa deve fare la subroutine edit
############################################################
sub edit {
    my $file = $_;

    # only operate on html files
    if ((-e $file) && (! -d $file) && (/.html?/)){	
	open (FH, "<",$file) || die $!;

        my $tree = HTML::Tree->new();
	$tree->parse_file($file) || die $!;

        # The main div contains the post of interest
	my $getmaindiv = $tree->look_down(_tag => "div",id  => "post_principale") || die $!;
	print $getmaindiv->as_HTML, "\n";	
	close FH;
    }
}