excise ext/*

[vchuravy]

It would be great if we could excise the copied dependencies in ext/*,
which is needed by JuliaLang/julia#25714

Probably moving TOML to JuliaLang would be sensible and for the rest we should be able to use upstream.

[KristofferC]

We only need a little bit from BinaryProvider (one file) so that could probably be seen as an implementation detail. For TOML, we could make it an stdlib or keep it as ext.

[bicycle1885]

Just in case you're interested, I wrote a TOML parser that is v0.4.0 compatible (as far as I'm aware of) this weekend. It is still in alpha quality, but may be useful for Pkg3.jl in the future. The code is here: https://github.com/bicycle1885/TOML.jl.

[KristofferC]

It would be nice to be able to use the 0.4.0 functionalities in TOML. A benchmark to compare with could be #116.

I tried it but it seems to fail at key = "string". key = 'string' works.

[StefanKarpinski]

I'd really like to have a TOML parser that let's me pull out specific values and generates a custom state machine that can scan through extracting those values at maximal speed. Essentially something that can generate the kinds of methods I've written in base/loading.jl to do this with regular expressions:

https://github.com/JuliaLang/julia/blob/c4c93ea692e9972a97a3f7149d79c92ad5d8106d/base/loading.jl#L480-L510

That's a fairly involved project, however, but it would be generally useful.

[00vareladavid]

Closing in favor of #1011