Support for oneOf in messages

[clementd-fretlink]

I'm currently using https://hackage.haskell.org/package/protobuf but would like to use protobuf-simple instead. The missing feature that's blocking me is support for oneOf within a message.

Is there planned work to support it, or maybe there is a not-obvious blocker for this?

If it's "it's not just done yet", i could work on a PR implementing it.

[mrijkeboer]

Hi @clementd-fretlink,

oneOf is not implemented, because I didn't need it. What's your idea for implementing it, as a sum-type?

[clementd-fretlink]

Yes. I'm not 100% clear on how haskell identifiers are generated (in order to avoid conflicts).

The oneOf block takes a name parameter, so that could be used in combination with the message name to generate an identifier for the sum type. Same for the constructors of the sum type, that could be built from the message name + field names.