[RFC] servant-elm-street

[chshersh]

TODO

[googleson78]

I'm trying something out here: https://github.com/googleson78/servant-elm-street

With the following approach for url segments + query params + headers:

Create a "stringifier" for types (similar to decoders and encoders) that works for integers, strings, enums and newtypes over all these (for now since these are the only things I'm currently using).
This relies on the user using Show/Read for their {To,From}HttpApiData instances, which could be made easier for DerivingVia usage like the ElmStreet newtype is for {To,From}JSON.

Use this stringifier to create segments/params/headers, with additionally supporting Maybe versions of these.

I don't know of a better approach than this "stringifier" thing, and looking at servant-elm they also seem to assume that their e.g. query parameters are always integers/strings.

I ended up copying a lot of code from elm-street - e.g. I need to know names of types and decoders/encoders so I can use them in my requests, so if this ends up working fine I might do a PR to expose these from here, if it's fine.