Support swift_prefix override

[q42jaap]

Feature

The file option swift_prefix isn't available as a buf.gen.yaml managed override.

When I try, buf refuses to parse the config:

version: v2
inputs:
  - directory: api
managed:
  enabled: true
  override:
    - path: user/v1
      file_option: swift_prefix
      value: UserV1

Results in the error.

Failure: decode config file: unknown file_option: "swift_prefix"

private/bufpkg/bufconfig/generate_managed_option.go has a limited list of file options where swift_prefix is absent.

swift_prefix is used by buf.build/connectrpc/swift and buf.build/apple/swift

Please add it to buf.gen.yaml config, now every file needs to have the swift_prefix repeated.

[doriable]

Thank you for filing this issue! Currently, managed mode prioritises support for the built-in protoc plugins, however, I think this is a very reasonable request. We’re currently not able to prioritise this work immediately, but I’m happy to chat with the team and look into getting this implemented in the future.