render-deploy.yaml

name: Render to HTML & Deploy
on:
  push:
    branches:
      - main
    paths:
      - src/G*/**
  repository_dispatch:
    types: [update-assets]

jobs:
  check-changes:
    name: Check if Rmd or image files changed
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v2
        with:
          fetch-depth: 0

      - name: Find directories with changed rmd or image files
        id: changed-files-dir-names
        uses: tj-actions/changed-files@v44
        with:
          files:  |
            src/G*/*.{rmd,Rmd,html,css}
            src/G*/js/*.js
            src/G*/css/*.css
            src/G*/img/*.{png,gif}
            src/G*/img/*/*.{png,gif}
          dir_names: "true"
          dir_names_max_depth: 2
          dir_names_deleted_files_include_only_deleted_dirs: "true"
          output_renamed_files_as_deleted_and_added: "true"

      - name: Render modified courses to HTML and move output to docs
        env:
          WORKFLOW: true
          CHANGED_DIRS: ${{ steps.changed-files-dir-names.outputs.all_changed_files }}
        run: |
          set -e

          for folder in ${CHANGED_DIRS}; do
            code="${folder#src/}"
            ./render.sh $code
          done

          if [ ! -d "docs" ]; then
            mkdir docs
          fi

          cp ./pagesroot/* ./docs/

      - name: Add, Commit & Push
        env:
          CHANGED_DIRS: ${{ steps.changed-files-dir-names.outputs.all_changed_files }}
          DELETED_DIRS: ${{ steps.changed-files-dir-names.outputs.deleted_files }}
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          set -e

          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

          # Create temporary branch with no history
          git checkout --orphan temp-pages

          # Unstage files from 'main'
          git rm -r --cached .

          # Checkout course folder from live 'pages' branch
          git checkout remotes/origin/pages -- ./G*

          # Remove course folders that were either changed or deleted
          # This way we can keep the unchanged folders
          # This is done so that we can render only the courses that had
          # changes made to them, speeding up the process
          for folder in ${CHANGED_DIRS} ${DELETED_DIRS}; do
            code="${folder#src/}"
            rm -rf $code
          done

          # We add all courses that were left over
          git add G*

          # Add docs, which contains the courses
          # that were rendered in the previous step
          # as well as the favicon and index
          git add docs

          # Remove everything that wasn't explicitly 'git add'ed
          git clean -df

          # Move courses and assets to root
          mv docs/* .
          rm -r docs

          # Finally add everything and commit
          # Since the temp branch has no history this will
          # be the first and only commit
          git add .
          git commit -m "Automatic: Render docs from ${GITHUB_SHA}"

          # Rename the temporary branch and overwrite pages
          git branch -M temp-pages pages

          # Force push
          git push --force origin pages