docs.yml

name: docs

on:
  push:
    branches:
      - master
    paths:
      - 'doc/**'

  pull_request:
    branches:
      - master
    paths:
      - 'doc/**'

  workflow_dispatch:

permissions:
  contents: read
jobs:

  # The test-build job will run regardless of whether the PR branch is from ESCOMP/CTSM or a fork.

  test-build:
    if: ${{ always() }}
    name: Test building documentation
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
          lfs: true
      - name: Install python 3.x
        uses: actions/setup-python@v2
        with:
          python-version: '3.x'
      # https://github.com/actions/cache/blob/main/examples.md#python---pip
      - name: Cache pip
        uses: actions/cache@v3
        with:
          path: ~/.cache/pip
          key: ${{ runner.os }}-pip-${{ hashFiles('doc/requirements.txt') }}
          restore-keys: |
            ${{ runner.os }}-pip-
      - name: Install dependencies
        run: |
          pip install -r doc/requirements.txt
      # Build documentation under ${PWD}/_build
      - name: Build Sphinx docs
        run: |
          make BUILDDIR=${PWD}/_build -C doc/ html

# The following jobs will only run if the PR branch is in ESCOMP/CTSM, not a fork.

  cleanup:
    permissions:
      contents: write  #  for git push
    name: Cleanup branch previews
    runs-on: ubuntu-latest
    if: (github.event_name == 'push' || github.event_name == 'workflow_dispatch') && github.event.pull_request.head.repo.full_name == github.repository
    steps:
      - uses: actions/checkout@v3
        with:
          ref: 'gh-pages'
          fetch-depth: 0
          lfs: true
          path: gh-pages
      - name: Remove branch previews
        run: |
          pushd $GITHUB_WORKSPACE/gh-pages

          if [[ -e "$GITHUB_WORKSPACE/gh-pages/branch" ]]; then
            ls -la "$GITHUB_WORKSPACE/gh-pages/branch"

            for name in `ls branch/`
            do
              if [[ -z "$(git show-ref --quiet ${name})" ]]
              then
                git rm -rf branch/${name}

                echo "Removed $GITHUB_WORKSPACE/gh-pages/branch/${name}"
              fi
            done

            git config user.name github-actions[bot]
            git config user.email github-actions[bot]@users.noreply.github.com
            git commit -m "Clean up branch previews"
            git push
          fi

          echo "Done cleaning branches"
  build-and-deploy:
    permissions:
      contents: write  #  for peaceiris/actions-gh-pages to push
      pull-requests: write  #  to comment on pull requests
    needs: cleanup
    if: github.event.pull_request.head.repo.full_name == github.repository
    name: Build and deploy documentation
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v3
        with:
          fetch-depth: 0
          lfs: true
      - name: Install python 3.x
        uses: actions/setup-python@v2
        with:
          python-version: '3.x'
      # https://github.com/actions/cache/blob/main/examples.md#python---pip
      - name: Cache pip
        uses: actions/cache@v3
        with:
          path: ~/.cache/pip
          key: ${{ runner.os }}-pip-${{ hashFiles('doc/requirements.txt') }}
          restore-keys: |
            ${{ runner.os }}-pip-
      - name: Install dependencies
        run: |
          pip install -r doc/requirements.txt
      # Build documentation under ${PWD}/_build
      - name: Build Sphinx docs
        run: |
          make BUILDDIR=${PWD}/_build -C doc/ html
      - name: Push PR preview
        if: |
          github.event_name == 'pull_request' &&
          github.event.pull_request.head.repo.full_name == github.repository
        uses: peaceiris/actions-gh-pages@v3
        with:
          github_token: ${{secrets.GITHUB_TOKEN}}
          publish_dir: './_build/html'
          destination_dir: './branch/${{ github.event.pull_request.head.ref }}/html'
          user_name: 'github-actions[bot]'
          user_email: 'github-actions[bot]@users.noreply.github.com'
      - name: Comment about previewing documentation
        if: |
          github.event_name == 'pull_request' &&
          github.event.pull_request.head.repo.full_name == github.repository
        uses: actions/github-script@v6
        with:
          script: |
            const comments = await github.paginate(github.rest.issues.listComments, {
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number
            });

            const havePosted = comments.map(x => x.user.login).some(x => x === "github-actions[bot]");

            if (!havePosted) {
              await github.rest.issues.createComment({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: 'You can preview documentation at https://escomp.github.io/ctsm/branch/${{ github.event.pull_request.head.ref }}/html/index.html'
              })
            }
      - name: Push new docs
        if: ${{ github.event_name == 'push' }}
        uses: peaceiris/actions-gh-pages@v3
        with:
          github_token: ${{secrets.GITHUB_TOKEN}}
          publish_dir: './_build/html'
          destination_dir: './versions/master/html'
          user_name: 'github-actions[bot]'
          user_email: 'github-actions[bot]@users.noreply.github.com'