Re: Package graph queries

[Catonano <catonano@gmail.com>]

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2016-07-31 0:19 GMT+02:00 Ludovic Courtès <ludo@gnu.org>:

> Jelle Licht <jlicht@fsfe.org> skribis:
>
> > On Jul 29, 2016 16:53, "Catonano" <catonano@gmail.com> wrote:
>
> [...]
>
> >> For example: which are the packages with less or no dependencies (and a
> >> lot of dependants) ?
> >> Because those should be imported first, in my opinion.
>
> [...]
>
> > ^ This, I like. Does anyone have any suggestions on tools that could help
> > me do this in guile?
>
> I understand you want to perform these queries on NPM packages, not Guix
> packages, but if you could hook your NPM package representation in (guix
> graph)¹, you could do the same as this:
>
> --8<---------------cut here---------------start------------->8---
> scheme@(guile-user)> ,use(guix graph)
> scheme@(guile-user)> ,use(guix scripts graph)
> scheme@(guile-user)> ,use(gnu packages)
> scheme@(guile-user)> ,use(guix monad-repl)
> scheme@(guile-user)> ,enter-store-monad
> store-monad@(guile-user) [1]> (node-back-edges %bag-node-type
> (fold-packages cons '()))
> $4 = #<procedure 59ac880 at guix/graph.scm:87:17 (node)>
> store-monad@(guile-user) [1]> ,q
> scheme@(guile-user)> ,use(srfi srfi-1)
> scheme@(guile-user)> (filter (lambda (p)
>                                (> (node-reachable-count (list p) $4)
>                                   600))
>                              (fold-packages cons '()))
>

My concern, here, would be an equivalent of "fold-packages" for
registry.npmjs.com.

The API seems a bit cloudy to me.

See this question
https://stackoverflow.com/questions/34071621/query-npmjs-registry-via-api

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