sync-upstream.yml

name: Sync from upstream java.evolved

on:
  schedule:
    # Weekly on Monday at 06:00 UTC
    - cron: '0 6 * * 1'
  workflow_dispatch: # Manual trigger from Actions tab

permissions:
  contents: write
  pull-requests: write

jobs:
  sync:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout this repo
        uses: actions/checkout@v4

      - name: Clone upstream source
        run: |
          git clone --depth 1 https://github.com/javaevolved/javaevolved.github.io.git /tmp/upstream

      - name: Set up Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.12'

      - name: Gather upstream info
        id: upstream
        run: |
          YAML_COUNT=$(find /tmp/upstream/content -name "*.yaml" | wc -l | tr -d ' ')
          UPSTREAM_SHA=$(cd /tmp/upstream && git rev-parse --short HEAD)
          UPSTREAM_DATE=$(cd /tmp/upstream && git log -1 --format=%cs)
          echo "yaml_count=$YAML_COUNT" >> "$GITHUB_OUTPUT"
          echo "sha=$UPSTREAM_SHA" >> "$GITHUB_OUTPUT"
          echo "date=$UPSTREAM_DATE" >> "$GITHUB_OUTPUT"
          echo "Found $YAML_COUNT upstream patterns (commit $UPSTREAM_SHA from $UPSTREAM_DATE)"

      - name: Regenerate references
        run: |
          python3 scripts/generate-references.py \
            --content-dir /tmp/upstream/content \
            --output-dir references/

      - name: Check for changes
        id: changes
        run: |
          if git diff --quiet -- references/; then
            echo "has_changes=false" >> "$GITHUB_OUTPUT"
            echo "No changes detected — references are up to date."
          else
            echo "has_changes=true" >> "$GITHUB_OUTPUT"
            echo "Changes detected:"
            git diff --stat -- references/
          fi

      - name: Create pull request
        if: steps.changes.outputs.has_changes == 'true'
        uses: peter-evans/create-pull-request@v6
        with:
          commit-message: "chore: sync references from upstream (${{ steps.upstream.outputs.sha }})"
          title: "Sync: Update patterns from java.evolved (${{ steps.upstream.outputs.date }})"
          body: |
            Automated sync from [javaevolved/javaevolved.github.io](https://github.com/javaevolved/javaevolved.github.io).

            - Upstream commit: `${{ steps.upstream.outputs.sha }}`
            - Patterns found: ${{ steps.upstream.outputs.yaml_count }}

            Review the reference file changes below to verify correctness.
          branch: sync/upstream-update
          delete-branch: true
          labels: automated,sync