name: auto-generate-docs

# Run this workflow every time a new commit pushed to your repository
on:
  push:
    branches:
      - master
      - main
    paths:
      - 'docs/**'
      - 'website/**'
      - 'assets/**'

jobs:
  # Set the job key. The key is displayed as the job name
  # when a job name is not provided
  docs:
    # Name the Job
    name: auto-generate-docs
    # Set the type of machine to run on
    runs-on: ubuntu-latest

    steps:
      # Checks out a copy of your repository on the ubuntu-latest machine
      - name: Checkout code
        uses: actions/checkout@v3
        with:
          submodules: recursive  # Fetch the Docsy theme
          fetch-depth: 0

      # Checks if the previous commit introduced any changes to website files
      - name: Check for changes
        run: |
          IS_CHANGED=$(git diff --name-only ${{ github.event.before }} ${{ github.sha }} | grep -Ec "^website*" || :)
          [[ $IS_CHANGED -gt 0 ]] && echo "IS_CHANGED=true" >> $GITHUB_ENV || echo "IS_CHANGED=false" >> $GITHUB_ENV

      # Sets up the appropriate version of Hugo
      - name: Setup Hugo
        if: env.IS_CHANGED == 'true'
        uses: peaceiris/actions-hugo@v2
        with:
          hugo-version: '0.113.0'
          extended: true

      # Sets up node - required by Hugo
      - name: Setup Node
        if: env.IS_CHANGED == 'true'
        uses: actions/setup-node@v1
        with:
          node-version: '12.x'

      # Installs dependencies required by docsy theme
      - name: Install docsy dependencies
        if: env.IS_CHANGED == 'true'
        run: |
          cd website
          npm install
          npm build
          sudo npm install -D --save autoprefixer
          sudo npm install -D --save postcss-cli
          cd ../

      - name: Update last modified date in modified docs
        if: env.IS_CHANGED == 'true'
        run: |
          git diff --name-only --diff-filter=d ${{ github.event.before }} ${{ github.sha }} | grep -E "^website*" \
          | sed -e 's/\(.*\)/"\1"/' | xargs sed -i "/date:/c\date: $(date +'%Y-%m-%d')"

      # Runs makefile goal - checks changes to /website folder and generates docs
      - name: Run Makefile goal
        if: env.IS_CHANGED == 'true'
        env:
          DEFAULT_BRANCH: master
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: make generate-docs

      # Creates pull request with generated docs
      - name: Create Pull Request
        if: env.IS_CHANGED == 'true'
        uses: peter-evans/create-pull-request@v5
        with:
          commit-message: Auto-updated docs
          branch: docs-generator
          title: Auto-generated docs update
          body: |
            Auto generated docs from master commit ${{ github.sha }}