Circle 2.1 Scala cross-building

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Greetings,

This is my Circle config for building Scala code from sbt. It supports building against multiple versions of Scala.

It uses new commands and executors in Circle 2.1 that take parameters. The Scala version is the build name. This is useful when displayed in Circle’s build dashboard. It requires repeating the Scala version in both the build name and the command parameter, but it’s worth it.

version: 2.1

executors:
  scala_jdk_executor:
    docker:
      - image: circleci/openjdk:8-jdk

commands:
  sbt_cmd:
    description: "Build with sbt"
    parameters:
      scala_version:
        type: string
        default: 2.12.8
      sbt_tasks:
        type: string
        default: update compile test:compile test doc package
    steps:
      - restore_cache:
          keys:
            - sbt-deps-v1-{{ checksum "build.sbt" }}
            - sbt-deps-v1-
      - run: sbt ++<< parameters.scala_version >> << parameters.sbt_tasks >>
      - save_cache:
          key: sbt-deps-v1-{{ checksum "build.sbt" }}
          paths:
            - "~/.ivy2/cache"
            - "~/.sbt"
            - "~/.m2"

jobs:
  scala_job:
    executor: scala_jdk_executor
    parameters:
      version:
        description: "Scala version"
        default: 2.10.7
        type: string
    steps:
      - checkout
      - sbt_cmd:
          scala_version: << parameters.version >>
          sbt_tasks: update compile test package

workflows:
  build:
    jobs:
      - scala_job:
          name: 2.10.7
          version: 2.10.7
      - scala_job:
          name: 2.11.12
          version: 2.11.12
      - scala_job:
          name: 2.12.8
          version: 2.12.8
      - scala_job:
          name: 2.13.0-M5
          version: 2.13.0-M5

Thanks for Circle,
Aaron

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