action.yml

name: "Setup Scala with both Java and sbt"
description: "Much longer description"
inputs:
  major-java-version:
    description: 'Specify a major Java version (21, 11, etc) as an alternative to reading one from .tool-versions'
    required: false
    default: ''
runs:
  using: "composite"
  steps:
    - name: Determine major Java version
      id: determine-java-version
      shell: bash
      env:
        MAJOR_JAVA_VERSION: ${{ inputs.major-java-version }}
      run: |
        if [ ${MAJOR_JAVA_VERSION} ]; then
          echo "Reading Java version from the 'major-java-version' input property, rather than .tool-versions"
        else
          if [ ! -f .tool-versions ]; then
            echo "::error title=Missing .tool-versions file::setup-scala prefers an asdf-format .tool-versions file to establish the Java version for the build - a standard file that is understood by many different tools. Failing this, specify the 'major-java-version' parameter."

            exit 1
          fi
          MAJOR_JAVA_VERSION=$( grep -Eo 'java [[:alnum:]-]+-[[:digit:]]+' .tool-versions | rev | cut -d'-' -f1 | rev )
          
          if [ -z "${MAJOR_JAVA_VERSION}" ]; then
            echo "::error title=Missing Java version in .tool-versions file::Could not establish the project's required Java version - the '.tool-versions' file should have a line like 'java corretto-21.0.3.9.1'."
            exit 1
          fi
        fi

        echo "Using Java $MAJOR_JAVA_VERSION"
        
        cat << EndOfFile >> $GITHUB_OUTPUT
        major_java_version=$MAJOR_JAVA_VERSION
        EndOfFile

    - name: Setup Java
      uses: actions/setup-java@v4
      with:
        java-version: ${{ steps.determine-java-version.outputs.major_java_version }}
        distribution: "corretto"
        cache: sbt

    - name: Setup sbt
      uses: sbt/setup-sbt@v1.1.5