bookorbit/.github/workflows/star-history.yml

name: Star History

on:
  workflow_dispatch:
  schedule:
    - cron: "37 6 * * *"
  push:
    branches: [main]
    paths:
      - ".github/workflows/star-history.yml"
      - "scripts/star-history/**"

permissions: {}

concurrency:
  group: star-history
  cancel-in-progress: false

jobs:
  publish:
    name: Refresh chart
    if: github.repository == 'bookorbit/bookorbit'
    runs-on: ubuntu-latest
    timeout-minutes: 10
    permissions:
      contents: write

    steps:
      - name: Checkout
        uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1

      - name: Set up Node.js
        uses: actions/setup-node@820762786026740c76f36085b0efc47a31fe5020 # v6
        with:
          node-version: 24

      - name: Test generator
        run: node --test scripts/star-history/generate.test.mjs

      - name: Restore accumulated series
        env:
          SERIES_PATH: ${{ runner.temp }}/star-history.json
        run: |
          if git ls-remote --exit-code --heads origin star-history >/dev/null; then
            git fetch --depth 1 origin \
              '+refs/heads/star-history:refs/remotes/origin/star-history'
            git show origin/star-history:star-history.json > "$SERIES_PATH"
          else
            cp scripts/star-history/bootstrap.json "$SERIES_PATH"
          fi

      - name: Generate chart
        env:
          GITHUB_TOKEN: ${{ github.token }}
          STAR_HISTORY_TOKEN: ${{ secrets.STAR_HISTORY_TOKEN }}
          SERIES_PATH: ${{ runner.temp }}/star-history.json
          SVG_PATH: ${{ runner.temp }}/star-history.svg
        run: |
          node scripts/star-history/generate.mjs \
            --repo "$GITHUB_REPOSITORY" \
            --series "$SERIES_PATH" \
            --bootstrap scripts/star-history/bootstrap.json \
            --out "$SVG_PATH"

      - name: Publish chart and data
        env:
          SERIES_PATH: ${{ runner.temp }}/star-history.json
          SVG_PATH: ${{ runner.temp }}/star-history.svg
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"

          json_blob=$(git hash-object -w "$SERIES_PATH")
          svg_blob=$(git hash-object -w "$SVG_PATH")
          tree=$(printf '100644 blob %s\tstar-history.json\n100644 blob %s\tstar-history.svg\n' \
            "$json_blob" "$svg_blob" | git mktree)

          parent=$(git rev-parse --verify refs/remotes/origin/star-history 2>/dev/null || true)
          if [ -n "$parent" ]; then
            previous_tree=$(git rev-parse "$parent^{tree}")
            if [ "$tree" = "$previous_tree" ]; then
              echo "Star history is unchanged"
              exit 0
            fi
            commit=$(printf '%s\n' "chore: update star history" | \
              TZ=UTC git commit-tree "$tree" -p "$parent")
          else
            commit=$(printf '%s\n' "chore: initialize star history" | \
              TZ=UTC git commit-tree "$tree")
          fi

          git push origin "$commit:refs/heads/star-history"