How does one currently get a count of downstream deps?
I don't think this is documented anywhere, so let me blog about it before I forget it. Install the module CPANDB. See if it works by running one sample program, maybe:
use CPANDB; use YAML::Syck; print Dump [CPANDB::Distribution->select ("order by volatility desc limit 1")];
It may take a while but you will get something like this:
!!perl/array:CPANDB::Distribution Exporter '5.63' FERREIRA 1 perl FERREIRA/Exporter-5.63.tar.gz [...]
The kick now is that after such a command you have the current database on your local disk. I found it in my homedirectory under
Now you can access it directly and find, e.g., the modules depending on Catalyst::Devel with:
% sqlite3 ~/.perl/ORLite-Mirror/CPANDB.sqlite SQLite version 3.7.4 Enter ".help" for instructions Enter SQL statements terminated with a ";" sqlite> select distribution from requires where module='Catalyst::Devel'; Catalyst-Authentication-Credential-OpenID Catalyst-Example-InstantCRUD Catalyst-Example-InstantCRUDStylish Catalyst-Helper-AuthDBIC Catalyst-Helper-View-TT-Bootstrap Catalyst-Model-Cronolog Catalyst-Model-Estraier Catalyst-Model-JabberRPC Catalyst-Model-SVN Catalyst-Model-XMLRPC CatalystX-Starter Handel Task-BeLike-MELO Task-CatInABox Task-Catalyst Task-Catalyst-Tutorial