Expose deriver for use by other derivers?

[apatil]

I'm working on a library, https://github.com/apatil/aplomb, that involves a ppx deriver. The deriver needs to emit to_yojson as well as a few other functions that are specific to my library.

Put another way, in the example in the https://github.com/apatil/aplomb/README.md, I currently have [@@deriving yojson,aplomb]. I'd like to shorten that to [@@deriving aplomb] but still have ppx_deriving_yojson generate to_yojson.

Would it make sense to expose ppx_deriving_yojson's deriver in the library so that derivers like mine can use and augment it, or is there an easier way to do what I want?

@whitequark I'd be happy to submit a patch if it makes sense, I see from other issues that you're crunched for time.

[whitequark]

I agree this is valuable. Please submit a patch. I'll review the overall architecture.