name: Publish documentation

on:
  push:
    branches:
      - main
    paths:
      - "docs/**"
      - "mkdocs.yml"
      - "docs/requirements.txt"
      - ".gitea/workflows/publish-docs.yml"
  workflow_dispatch:

permissions:
  contents: write

concurrency:
  group: documentation
  cancel-in-progress: true

jobs:
  publish:
    runs-on: ubuntu-latest
    env:
      GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
      REPOSITORY_URL: ${{ gitea.server_url }}/${{ gitea.repository }}.git

    steps:
      - name: Checkout documentation source
        uses: actions/checkout@v4

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: "3.x"
          cache: pip
          cache-dependency-path: docs/requirements.txt

      - name: Install MkDocs dependencies
        run: python -m pip install -r docs/requirements.txt

      - name: Build documentation
        # Some documented source files intentionally live outside docs/.
        run: mkdocs build

      - name: Publish generated site to the pages branch
        working-directory: site
        run: |
          git init
          git config user.name "Gitea Actions"
          git config user.email "actions@${{ gitea.server_url }}"
          git add --all
          git commit --message "Publish documentation for ${{ gitea.sha }}"
          git -c http.extraheader="Authorization: token ${GITEA_TOKEN}" \
            push --force "${REPOSITORY_URL}" HEAD:pages