Which modules on the whole CPAN depends on this module?

sedusedan has asked for the wisdom of the Perl Monks concerning the following question:

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Re: Which modules on the whole CPAN depends on this module? by davido (Cardinal) on Jul 05, 2013 at 07:26 UTC
Both http://deps.cpantesters.org/depended-on-by.pl and Metacpan's Reverse Dependency Tool only show immediate reverse-dependencies. As for Regexp::Grammars, are you referring to rt://86410? That's been fixed in version 1.030, which is dated June 25th 2013. I don't see any 5.18 FAIL reports for version 1.030. Update: But there are Other issues. Dave	[reply]
Re^2: Which modules on the whole CPAN depends on this module? by sedusedan (Pilgrim) on Jul 05, 2013 at 07:33 UTC
I used RG as an example, but that's good to hear!	[reply]
Re: Which modules on the whole CPAN depends on this module? by Corion (Patriarch) on Jul 05, 2013 at 07:20 UTC
At the top of http://deps.cpantesters.org/ there is a link titled "Reverse lookup". It leads to http://deps.cpantesters.org/depended-on-by.pl, which I would imagine implements http://deps.cpantesters.org/ but in reverse. Also, I'm under the impression that the problem of Regex::Grammars with 5.18 is reliance of a bug in Perl which was fixed. This then uncovered segfaults in the regex engine, which should be fixed in 5.18.1. There seems to be some discussion on p5p regarding this: http://www.xray.mpe.mpg.de/mailing-lists/perl5-porters/2013-06/msg01205.html	[reply]
Re^2: Which modules on the whole CPAN depends on this module? by sedusedan (Pilgrim) on Jul 05, 2013 at 07:36 UTC
As davido also pointed out, only immediate reverse dependencies are currently shown by deps.cpantesters.org as well as MetaCPAN. Recursively querying MetaCPAN API should be straightforward, albeit rather inefficient.	[reply]
Re^3: Which modules on the whole CPAN depends on this module? by DrHyde (Prior) on Jul 05, 2013 at 11:02 UTC
Patches welcome to make it recurse. Also to make it spew out XML.	[reply]
Re: Which modules on the whole CPAN depends on this module? by ambrus (Abbot) on Jul 05, 2013 at 07:46 UTC
You can use rsync to keep a local mirror of the module metafiles only from a CPAN mirror. This takes much less disk space than mirroring the whole CPAN, and if you've downloaded them once you can use rsync to keep it up to date while transferring only the new files on the net. A command like `rsync -Rvz "cpan.some.mirror.com::CPAN/modules/by-authors/id/?/??/.//.meta" "cpan.some.mirror.com::CPAN/modules/02packages.details.txt" /path/to/local/mirror` should work if you change the url to a CPAN mirror close to you. Once you've got the metafiles and the 02packages.details.txt, you can parse them and search in them. The metafiles contain the dependenct modules of each distribution, and the 02packages.details.txt tells which distributions provide which modules.	[reply] [d/l]
Re: Which modules on the whole CPAN depends on this module? by sedusedan (Pilgrim) on Sep 12, 2013 at 19:17 UTC
Just an update. I've written list-rev-deps (on CPAN (1)) which uses MetaCPAN API as well as scrapes the website. (1) https://metacpan.org/module/list-rev-deps	[reply]