sync-mlx.yml

name: Sync MLX

on:
  schedule:
    - cron: '0 6 * * 1'
  workflow_dispatch:

jobs:
  update-mlx:
    runs-on: ubuntu-latest
    permissions:
      contents: write
      pull-requests: write
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
          submodules: recursive

      - name: Determine MLX release state
        id: mlx
        run: |
          git submodule update --init --recursive extern/mlx
          git -C extern/mlx fetch --tags origin

          LATEST_TAG=$(git -C extern/mlx for-each-ref --sort=-version:refname --format='%(refname:strip=2)' refs/tags | grep '^v' | head -n 1)
          if [ -z "$LATEST_TAG" ]; then
            echo "::error::Failed to determine latest MLX tag"
            exit 1
          fi

          CURRENT_TAG=$(git -C extern/mlx describe --tags --abbrev=0 2>/dev/null || echo "")

          echo "latest_tag=${LATEST_TAG}" >> "$GITHUB_OUTPUT"
          echo "current_tag=${CURRENT_TAG}" >> "$GITHUB_OUTPUT"
          echo "latest_version=${LATEST_TAG#v}" >> "$GITHUB_OUTPUT"

          if [ "$CURRENT_TAG" = "$LATEST_TAG" ]; then
            echo "MLX submodule already at ${CURRENT_TAG}"
            echo "update_needed=false" >> "$GITHUB_OUTPUT"
          else
            echo "MLX update required: ${CURRENT_TAG:-unknown} -> ${LATEST_TAG}"
            echo "update_needed=true" >> "$GITHUB_OUTPUT"
          fi

      - name: Prepare update branch
        if: steps.mlx.outputs.update_needed == 'true'
        env:
          BRANCH: mlx-sync/${{ steps.mlx.outputs.latest_version }}
        run: git checkout -B "$BRANCH"

      - name: Update MLX submodule
        if: steps.mlx.outputs.update_needed == 'true'
        run: |
          git -C extern/mlx checkout ${{ steps.mlx.outputs.latest_tag }}
          git add extern/mlx

      - name: Setup Python
        if: steps.mlx.outputs.update_needed == 'true'
        uses: actions/setup-python@v5
        with:
          python-version: '3.x'

      - name: Update package versions
        if: steps.mlx.outputs.update_needed == 'true'
        env:
          VERSION: ${{ steps.mlx.outputs.latest_version }}
        run: |
          python3 <<'PY'
          import os
          import re
          from pathlib import Path

          version = os.environ["VERSION"]
          props_path = Path("Directory.Build.props")
          text = props_path.read_text()
          text = re.sub(r"<Version>[^<]+</Version>", f"<Version>{version}</Version>", text)
          text = re.sub(r"<PackageVersion>[^<]+</PackageVersion>", f"<PackageVersion>{version}</PackageVersion>", text)
          props_path.write_text(text)
          PY
          git add Directory.Build.props

      - name: Commit changes
        if: steps.mlx.outputs.update_needed == 'true'
        id: commit
        env:
          TAG: ${{ steps.mlx.outputs.latest_tag }}
        run: |
          if git diff --cached --quiet; then
            echo "No staged changes to commit"
            echo "changed=false" >> "$GITHUB_OUTPUT"
            exit 0
          fi
          git config user.name "github-actions[bot]"
          git config user.email "41898282+github-actions[bot]@users.noreply.github.com"
          git commit -m "mlx: sync to ${TAG}"
          echo "changed=true" >> "$GITHUB_OUTPUT"

      - name: Setup .NET
        if: steps.commit.outputs.changed == 'true'
        uses: actions/setup-dotnet@v4
        with:
          dotnet-version: 9.0.x

      - name: Build solution
        if: steps.commit.outputs.changed == 'true'
        run: |
          dotnet restore
          dotnet build --configuration Release --no-restore

      - name: Push changes
        if: steps.commit.outputs.changed == 'true'
        env:
          BRANCH: mlx-sync/${{ steps.mlx.outputs.latest_version }}
        run: |
          git push --force --set-upstream origin "$BRANCH"

      - name: Create or update pull request
        if: steps.commit.outputs.changed == 'true'
        uses: actions/github-script@v7
        env:
          BRANCH: mlx-sync/${{ steps.mlx.outputs.latest_version }}
          PR_TITLE: "MLX: sync to ${{ steps.mlx.outputs.latest_tag }}"
          PR_BODY: |
            - Update `extern/mlx` submodule to `${{ steps.mlx.outputs.latest_tag }}`
            - Align package version fields to `${{ steps.mlx.outputs.latest_version }}`
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const branch = process.env.BRANCH;
            const title = process.env.PR_TITLE;
            const body = process.env.PR_BODY;
            const owner = context.repo.owner;
            const repo = context.repo.repo;
            const base = context.payload.repository.default_branch;

            const { data: existing } = await github.rest.pulls.list({
              owner,
              repo,
              state: 'open',
              head: `${owner}:${branch}`,
            });

            if (existing.length > 0) {
              const pr = existing[0];
              await github.rest.pulls.update({
                owner,
                repo,
                pull_number: pr.number,
                title,
                body,
              });
              core.info(`Updated PR ${pr.html_url}`);
            } else {
              const { data: pr } = await github.rest.pulls.create({
                owner,
                repo,
                head: branch,
                base,
                title,
                body,
              });
              core.info(`Created PR ${pr.html_url}`);
            }