sync-stable-branch.yml

name: Sync Stable Branch with Slang Release

on:
  schedule:
    # Run at 3:00 AM UTC every day
    - cron: '0 3 * * *'
  workflow_dispatch:  # Allow manual trigger

jobs:
  sync-stable-branch:
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - name: Checkout main branch
        uses: actions/checkout@v4
        with:
          ref: main # Explicitly checkout main
          # Fetch all history for all branches and tags
          fetch-depth: 0
          # Get submodules, but don't update them yet
          submodules: 'recursive'

      - name: Set up Git
        run: |
          git config --global user.name 'Read the Docs Bot'
          git config --global user.email 'rtd-bot@shader-slang.com'

      - name: Get latest slang release tag
        id: slang_latest_tag
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }} # Provide token explicitly for gh
        run: |
          LATEST_TAG=$(gh release view --repo shader-slang/slang --json tagName --jq .tagName)
          if [ -z "$LATEST_TAG" ]; then
            echo "Failed to fetch latest slang release tag using gh"
            exit 1
          fi
          echo "tag=$LATEST_TAG" >> $GITHUB_OUTPUT
          echo "Fetched latest slang tag: $LATEST_TAG"

      - name: Update slang submodule to latest release tag
        run: |
          pushd docs/external/slang
          git fetch --tags origin
          git checkout ${{ steps.slang_latest_tag.outputs.tag }}
          popd
          echo "Checked out tag ${{ steps.slang_latest_tag.outputs.tag }} in docs/external/slang"

      - name: Commit and push changes to stable branch
        run: |
          git add docs/external/slang
          git commit -m "Sync stable to release (slang@${{ steps.slang_latest_tag.outputs.tag }})"
          git push origin HEAD:stable --force
          echo "Committed and force-pushed updates to stable branch."