in reply to List of installed modules

  use warnings;
  use strict;
  use File::Find;

  foreach my $dir (@INC) {
    File::Find::find (\&wanted,"$dir");
  }

sub wanted {
  if ($File::Find::name =~ /\.pm$/) {
    print "$File::Find::name\n";
  }
}

[download]
Hmmm. I could do better. Instead of the full path, we should print the module as it would be called and print the version number if found.
Update: Forgot to search perlmonks. Did a search on cpan and it was quicker to whip out the above code.

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Re: Re: List of installed modules
by jynx (Priest) on Dec 29, 2000 at 01:01 UTC
    the code's already been posted, and the other solutions are obviously better, but i wanted to do more useless one-lining...

    #!/usr/local/bin/perl -w
use strict;
use File::Find;

find { wanted => sub {print if /\.pm$/}, no_chdir=>1} $dir foreach my 
+$dir (@INC);

    [download]
    hmmm, there are probably subdirectories in @INC that we've already searched since it recursively goes through the directories. Which would be faster: a search through all the directories using find or a prune using a hash to not re-search directories we've been through? The following is untested (ok, so was the above code), but it's an example...

    # same guidelines as above, use strict and that ilk
 my %been_at;
 sub wanted {
    return if $been_at{$dir};
    $been_at{$dir} = 1;
    print if /\.pm$/;
 }
find { wanted => \&wanted, no_chdir => 1 } $dir foreach my $dir (@INC)
+;

    [download]
    So the question i now have is would it be faster to make a hash or recurse possibly the same directories? i don't think this example is a significantly large enough search space to make much of a difference, but if it were would the latter method be faster? i think so but maybe someone can point out something i'm missing...


    Also while i'm at it, is no_chdir a hit to performance when recursing directories? Is it better to allow it to change directories? Please comment, i'm still new to File::Find.

    jynx

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