on:
  pull_request:
    types:
      - opened
      - synchronize
      - reopened
      - ready_for_review
    branches:
      - master

jobs:
  attach:
    runs-on: ubuntu-18.04
    timeout-minutes: 10
    if: github.event.pull_request.draft == false

    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Generate branch diff file
        if: success()
        run: |
          echo "Head branch: ${GITHUB_HEAD_REF}"
          echo "Base branch: ${GITHUB_BASE_REF}"
          git log origin/${GITHUB_BASE_REF}..origin/${GITHUB_HEAD_REF} > ./branch-diff.txt

      - name: Extract previous version
        if: success()
        run: |
          export PREVIOUS_VERSION=$(git describe --tags --abbrev=0)
          echo "Previous version: ${PREVIOUS_VERSION}"
          echo "PREVIOUS_VERSION=${TAG}" > ${GITHUB_ENV}

      - name: Generate version number
        id: generate
        if: success()
        uses: juztcode/generate-semver@1.0.0
        with:
          branch-diff-file: ./branch-diff.txt
          previous-version: ${{ env.PREVIOUS_VERSION }}

      - name: Print version
  - if: success()
    run: echo ${{ steps.generate.outputs.generated-version }}