On Fri, 2 Feb 2018 15:51:32 +0000, Neil Bowers <neil.bow...@cogendo.com> wrote:
> > For the 5.29.* development cycle starting in May of this year, I would like > > to be able to use a ranking of CPAN distros which goes beyond asking: > > > > * "How many other distributions depend on this one?" > > > > ... to asking: > > > > * "How many distributions by other authors/maintainers depend on this one?" > > > > Would that be feasible? Has anyone attempted this already? > > When we were discussing the River model at QAH, and in discussions > afterwards, this came up. In the end we decided to keep things simple and go > with the current common definition. There are some tools in the CPAN > ecosystem that only count dependencies written by others. > > We’d need to agree which dists get ignored in this alternate scheme. Consider > this example: > > > > Here MARY has released a bunch of dists, but Foo-Bar is also relied > on by other dists written by MUNGO and MIDGE. > > The river count for Foo-Bar would be 2 here (ignoring the whole > branch that contains only dists from MARY), but the Foo river count > should be 3, I think. Foo-Bar “counts”, because it in turn is > depended on by dists from other authors. Otherwise the river count > would be 2 for both Foo and Foo-Bar. Basically we’re starting at the > “bottom" of the dependency graph, and trimming sub-graphs all from > one author. > Also consider this example: > > What’s the river count of Plant — 0, 1, or 3? I think it should be 1, > in this alternate measure. 1 or 3: 1 if module chains from the same author are "compressed" to 1, 3 if not More interesting would be Thing - Plant - Fruit - Banana - Silver Banana - Distasteful stuff JOHN PAUL RINGO RINGO RINGO GEORGE would plant now be 1, 2, or 4? > I.e. for sub-graphs by the same author, you only include the dist at > the head of the sub-graph. I'd suggest to have an option to squeeze any unbranched chain of modules from the same author to 1 > It would be useful to have both measures available: raw-river and > author-river. > > When looking at a dist there are (at least) three figures that might > be of interest: the full river count (total number of direct and > indirect dependencies), the author-filtered river count (as above), > and the number of direct dependencies (which could be split in 2 as > well). > > Neil -- H.Merijn Brand http://tux.nl Perl Monger http://amsterdam.pm.org/ using perl5.00307 .. 5.27 porting perl5 on HP-UX, AIX, and openSUSE http://mirrors.develooper.com/hpux/ http://www.test-smoke.org/ http://qa.perl.org http://www.goldmark.org/jeff/stupid-disclaimers/
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