Perl Rename Folders And Files With File::Find

I'm using this code to process my开发者_开发知识库 folders and files with two subs:

"sub folders" for folder names only

"sub files" for file names with extensions only

But I realized that "sub folders" messes with my files with extensions during the rename process.

How to distinguish the processes from one another or what is the intelligent way to tell "sub folders" to rename "names" with no extension and "sub files" to rename "names" with externsion?

find(\&folders, $dir_source); 
sub folders {
    my $fh = $File::Find::dir;
    my $artist = (File::Spec->splitdir($fh))[3];        

    if (-d $fh) {
        my $folder_name = $_;

        # some substitution

        rename $folder_name, $_;
    }
}


find(\&files, $dir_source); 
sub files {
    /\.\w+$/ or return;
    my $fn = $File::Find::name;

    my ($genre, $artist, $boxset, $album, $disc);   
    if ($fn =~ /Singles/ or $fn =~ /Box Set/) {
         ($genre, $artist, $boxset, $album, $disc) = (File::Spec->splitdir($fn))[2..6];
     }
     else {
         ($genre, $artist, $album, $disc) = (File::Spec->splitdir($fn))[2..5];
     }

     if (-e $fn) {
         my $file_name = $_;

         # some substitution

         rename $file_name, $_;
     }  
 }

File::Find::find() calls your sub for every file and folder. If you only want to affect folders, then ignore files:

And you'll need to call finddepth() instead of find(), since you're changing directory names (you'll want to rename the "deeper" directories before the more "shallow" ones).

finddepth(sub {
  return unless -d;

  (my $new = $_) =~ s/this/that/ or return;
  rename $_, $new or warn "Err renaming $_ to $new in $File::Find::dir: $!";
}, ".");

Alternative for multiple substitutions:

finddepth(sub {
  return unless -d;

  my $new = $_;
  for ($new) {
    s/this/that/;
    s/something/something_else/;
  }
  return if $_ eq $new;

  rename $_, $new or warn "Err renaming $_ to $new in $File::Find::dir: $!";
}, ".");

And in the files sub, I'd make the first statement:

return unless -f;