This is an unsupported project that we're releasing as a proof of concept.

This proof of concept exports a bazel project to bloop. The motivation is to allow the use of any tooling that already has a bloop integration, such as the metals language server.

This repo contains a bazel project compiled with rules_scala. In src there are Scala, thrift, and protobuf files which can be compiled with bazel. The following command exports the //src/scala/com/stripe/test:dummy_lib target to bloop.

python3 bloop/scripts/gen_bloop.py -v -t //src/scala/com/stripe/test:dummy_lib

Which populates the .bloop folder with a bloop project config for the dummy_lib target. Now you can try opening the project with metals.

The bazel rules that export this information can be imported into other bazel projects by adding something like this to the project's WORKSPACE file:

git_repository(
    name = "bloop",
    commit = "710cdd154641bcfeeaf4a3a568a71b1cd82e43a2", //update as necessary 
    remote = "[email protected]:stripe-archive/bazel-bloop-exporter.git",
)

You can then create a bloop_target rule for each target that you want to export. It's recommended that you use the tools/prelude file to do this automatically by creating a set of macros like the ones below:

load(
    "@io_bazel_rules_scala//scala:scala.bzl",
    upstream_scala_library = "scala_library",
    upstream_scala_binary = "scala_binary",
    upstream_scala_test = "scala_test"
)

load(
    "@bloop//bloop:bloop.bzl",
    "bloop_target",
)

def scala_library(**kwargs):
    bloop_target(**kwargs)
    upstream_scala_library(**kwargs)

def scala_binary(**kwargs):
    bloop_target(**kwargs)
    upstream_scala_binary(**kwargs)

def scala_test(**kwargs):
    bloop_target(**kwargs)
    upstream_scala_test(**kwargs)

You can now copy the bloop/scripts/gen_bloop.py script into your project and use it to generate bloop configs.

• Carmen Kwan
• Alex Beal
• Andy Scott