docs.yaml

name: Docs

on:
    push:
        branches:
            - main
    pull_request: ~

# See https://stackoverflow.com/a/72408109
concurrency:
    group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
    cancel-in-progress: true

env:
    TERM: xterm

jobs:
    check-markdown:
        name: Lint Markdown
        runs-on: ubuntu-latest
        timeout-minutes: 1
        steps:
            -   name: Checkout repository
                uses: actions/checkout@v4

            -   name: Check Markdown formatting
                uses: DavidAnson/markdownlint-cli2-action@v14.0.0
                with:
                    globs: "*.md|doc/**/*.md"

    check-links:
        name: Lint Links
        runs-on: ubuntu-latest
        timeout-minutes: 1
        steps:
            -   name: Checkout repository
                uses: actions/checkout@v4

            -   name: Restore lychee cache
                uses: actions/cache@v3
                with:
                    path: .lycheecache
                    key: cache-lychee-${{ github.sha }}
                    restore-keys: cache-lychee-

            -   name: Run Lychee
                uses: lycheeverse/lychee-action@v1.8.0
                with:
                    # To keep in sync with Makefile#lychee
                    args: "--verbose --no-progress '*.md' 'doc/**/*.md' --cache --max-cache-age 1d ."
                    output: ${{ runner.temp }}/lychee/out.md
                    fail: true

    build:
        runs-on: ubuntu-latest
        name: Build docs
        permissions:
            contents: write
        steps:
            -   name: Checkout
                uses: actions/checkout@v4

            -   name: Setup Python
                uses: actions/setup-python@v4
                with:
                    python-version: '3.8'

            # install pip=>20.1 to use "pip cache dir"
            -   name: Upgrade pip
                run: python3 -m pip install --upgrade pip

            -   name: Get pip cache dir
                id: pip-cache
                run: echo "::set-output name=dir::$(pip cache dir)"

            -   name: Cache dependencies
                uses: actions/cache@v3
                with:
                    path: ${{ steps.pip-cache.outputs.dir }}
                    key: ${{ runner.os }}-pip-${{ hashFiles('**/requirements.txt') }}
                    restore-keys: |
                        ${{ runner.os }}-pip-

            -   name: Install dependencies
                run: python3 -m pip install mkdocs mkdocs-material

            -   name: Rebuild website
                run: make _website_build

            -   uses: actions/upload-artifact@v3
                name: Upload the docs artifact
                with:
                    name: docs-website
                    path: dist/website

    # This is a "trick", a meta task which does not change, and we can use in
    # the protected branch rules as opposed to the tests one above which
    # may change regularly.
    validate-docs:
        name: Docs status
        runs-on: ubuntu-latest
        needs:
            - check-markdown
            - check-links
            - build
        if: always()
        steps:
            - name: Successful run
              if: ${{ !(contains(needs.*.result, 'failure')) }}
              run: exit 0

            - name: Failing run
              if: ${{ contains(needs.*.result, 'failure') }}
              run: exit 1

    deploy:
        runs-on: ubuntu-latest
        name: Deploy website
        permissions:
            contents: write
        if: github.ref == 'refs/heads/main'
        steps:
            -   uses: actions/download-artifact@v3
                with:
                    name: docs-website
                    path: dist/website

            -   name: Deploy
                uses: peaceiris/actions-gh-pages@v3
                with:
                    github_token: ${{ secrets.GITHUB_TOKEN }}
                    publish_dir: dist/website