add package search

[kczimm]

Trying to add a Pkg search feature after reading discussion in #616. Uses an implementation of the Damerau-Levenshtein string distance REPL.levsort to compare search names against those in the available registries.

[kczimm]

I'm not sure how to test this with the REPL interface. I've only tested it by,

julia> import Pkg
julia> Pkg.search(["helloworld", "and", "other", "package", "names"])
For `helloworld` found:
    WORLD, HelloWorldC_jll, LOLTools, Electron, and Millboard
For `and` found:
    AMD, Ant, PVD, Onda, and JLD
For `other` found:
    Tower, OneHot, Torch, FEHM, and OpSel
For `package` found:
    Packing, ACME, Pathogen, Pages, and GLMakie
For `names` found:
    Andes, NMEA, Mads, GCMAES, and Pages

[oxinabox]

Test Pkg repl mode using Pkg.pkg"search Exampol"

[kczimm]

Thanks, @oxinabox. I'll give it a try.

[kczimm]

Okay, cool. That failed. I'll have to figure out where/how to hook into that functionality.

[oxinabox]

Also rather than implementing own D.L distance can just use REPL.levsort which is a perfectly fine string metric.

[kczimm]

Whoa, that's great. I didn't know that existed. I was just following the discussion in #616.

[kczimm]

TODO: tests

[kczimm]

So maybe this isn't that useful, as one can just tab-complete inside of pkg>. Any thoughts @oxinabox ?

[StefanKarpinski]

No, I like it. We just need someone to review and then we can merge it, imo. Anyone strongly against having this?

[KristofferC]

I think tab completion is good enough for simple things and for more complicated things it is better to use https://juliahub.com/ui/index.html