There's a file in every CPAN mirror called 03modlist.data that contains the "registered module list." It's got no indenting, but if it did, it would look something like this:

sub data { my $result = {}; my $primary = "modid"; for (@$CPAN::Modulelist::data) { my %hash; @hash{@$CPAN::Modulelist::cols} = @$_; $result->{ $hash{$primary} } = \%hash; } $result; } $CPAN::Modulelist::cols = [ 'modid', 'statd', 'stats', 'statl', 'stati', 'statp', 'description', 'userid', 'chapterid', ]; $CPAN::Modulelist::data = [ [ 'ACL::Regex', 'b', 'd', 'p', 'O', 'b', 'Validation of actions via regular expression', 'PBLAIR', '11' ], ... ];

It's an index of some of the stuff on the CPAN, broken down into categories, sort of like the original Yahoo index. Or dmoz, which is apparently still out there! Just like those indices, it's only a subset of the total available content. Unlike those, things only appear on the module list when the author requests it. Over the years, authors have become less and less likely to register their modules, so the list became less relevant to finding the best answer, which meant authors would be even less likely to bother using it.

Some things that don't appear in the module list: DBIx::Class, Moose, Plack, Dancer, Mojolicious, cpanminus, and plenty of other things you have heard of and use.

Rather than keep the feature around, languishing, it's being shut off so that we can, eventually, delete a bunch of code from PAUSE.

The steps are something like this:

stop putting any actual module data into 03modlist

stop regenerating 03module list altogether, leave it a static file

convert module registration permissions to normal permissions

delete all the code for handling module registration stuff

Caribbean vacation

There's a pull request to make 03modlist empty already, just waiting to be applied… and it should be applied pretty soon. Be prepared!