sbt-protoc

This plugin uses protoc to generate code from proto files. This SBT plugin is meant supercede sbt-protobuf and sbt-scalapb.

Highlights

1. Uses protoc-jar by default (no need to install protoc)
2. Generates source code directly under src_managed by default (works better with IntelliJ)
3. Supports compiling protos in both test and compile configuration.
4. Supports JVM-based code generators. Write your own custom code generator.
5. Straightforward: No PB.protobufSettings, packaged as auto-plugin.

Installation

Step 1: create project/protoc.sbt with:

addSbtPlugin("com.thesamet" % "sbt-protoc" % "0.99.0")

libraryDependencies += "com.trueaccord.scalapb" %% "compilerplugin" % "0.5.41"

Step 2: add to build.sbt:

Nothing to do, if you only want to generate Java.

For ScalaPB:

PB.targets in Compile := Seq(
  scalapb.gen() -> (sourceManaged in Compile).value
)

To generate Java + Scala with Java conversions:

PB.targets in Compile := Seq(
  PB.gens.java -> (sourceManaged in Compile).value,
  scalapb.gen(javaConversions = true) -> (sourceManaged in Compile).value
)

Step 3: Put some protos in src/main/protobuf and compile

Additional options

The options below need to be scoped to either Compile or Test (if unsure, you probably want Compile)

Example settings:

// Additional directories to search for imports:
PB.includePaths in Compile ++= Seq(file("/some/other/path"))

// Make protos from some Jar available to import.
libraryDependencies ++= Seq(
  "com.google.protobuf" % "protobuf-java" % "3.1.0" % "protobuf"
)

// Changing where to look for protos to compile (default src/main/protobuf):
PB.protoSources in Compile := Seq(file(sourceDirectory.value / "somewhere"))

// Additional options to pass to protoc:
PB.protocOptions in Compile := Seq("-xyz")

// Excluding some proto files:
excludeFilter in PB.generate := "test-*.proto"

// When compiling in Windows, Python is used to bridge protoc and this JVM.
// To set the path for Python.exe:
PB.pythonExe := "/path/to/python.exe"

// Rarely needed: override where proto files from library dependencies are
// extracted to:
PB.externalIncludePaths := file("/tmp/foo")

// By default we generate into target/src_managed. To customize:
PB.targets in Compile := Seq(
  scalapb.gen() -> file("/some/other/dir")
)

// Use a locally provided protoc:
PB.runProtoc := (args => Process("/path/to/protoc", args)!)