file-pdf-rename-to-doc-title

#!/usr/bin/env perl
use v5.18;
use PDF::API2;

sub proc {
    my ($file) = @_;
    say "[$file] Processing";
    my $pdf = PDF::API2->open($file);
    my %info = $pdf->info();

    my $title = $info{'Title'};
    unless ($title) {
        say "[$file] Lack of Title";
        return;
    }

    say "[$file]: Title = $title";

    my $title_fn = trim($title);
    unless ($title_fn) {
        say "[$file] Title trimmed = $title_fn";
    }

    my $new_file = $title_fn . ' - ' . $file;
    rename($file, $new_file);
}

sub trim {
    my ($str) = @_;
    $str =~ s/\P{XPosixGraph}+/ /;
    $str =~ s/ +/ /;
    $str =~ s/^ //;
    $str =~ s/ $//;
    return $str;
}

proc($_) for grep { /\.pdf\z/i and -f $_ } @ARGV;