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Programming language: Scala
License: Apache License 2.0
Tags: Sbt Plugins    
Latest version: v0.1.2

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README

sbt-cppp

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sbt-cppp (Sbt Cross-Project Protobuf Plugin) is a Sbt plugin to support Protocol Buffers, especially in multi-project builds.

Features

sbt-cppp compiles *.proto into .java files. In addition, sbt-cppp provides some features missed in sbt-protobuf or other protobuf plugins:

  • Jar packaging from .proto files.
  • Cross-project protoc include path dependency management in multi-project builds.
  • Cross-library protoc include path dependency management by auto-unzipping .proto files from jar packages.
  • Support for custom code generator to .proto files.

Usage

Step 1: Install sbt-cppp into your project

Add the following line to your project/plugins.sbt:

addSbtPlugin("com.dongxiguo" % "sbt-cppp" % "0.1.4")

And add protobufSettings and protobuf-java dependency to your build.sbt:

protobufSettings

libraryDependencies += "com.google.protobuf" % "protobuf-java" % "2.5.0"

Step 2: Install protoc into $PATH

For windows, download at http://code.google.com/p/protobuf/downloads/detail?name=protoc-2.5.0-win32.zip. For most linux distributions, look for protobuf-compiler package.

Step 3: Create your .proto files.

Create src/protobuf/sample_proto.proto

message SampleMessage {
  optional int32 sample_field = 1;
}

Step 4: Use the .proto files in your source files.

Create src/main/scala/SampleMain.scala:

object SampleMain {
  def main(args: Array[String]) {
    println(SampleMessage.newBuilder.setSampleField(123).build)
  }
}

Step 5: Run it!

$ sbt
> run-main SampleMain

Further information

  • sbt-cppp is for sbt 0.12 or 0.13
  • If project-foo depends on project-bar, project-bar/src/protobuf/ will be added as a protoc include path when the plugin converts project-foo/src/protobuf/*.proto into .java files.
  • If you want to generate .proto files by some tools (instead of creating them manually), put sourceGenerators in Protobuf += yourGenerator in your build.sbt.