syncnext.yml

name: Sync develop to next - update detected

on:
  schedule:
    - cron: '0 2 * * 0'
  workflow_dispatch:

permissions:
  contents: write
  pull-requests: write

jobs:
  sync:
    name: Sync develop into next
    runs-on: ubuntu-latest
    steps:
      - name: Checkout repository
        uses: actions/checkout@v7
        with:
          fetch-depth: 0

      - name: Configure git identity
        run: |
          git config user.name  "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"

      - name: Check sync status
        id: sync_check
        run: |
          git fetch origin develop next
          DEVELOP_SHA=$(git rev-parse origin/develop)
          NEXT_SHA=$(git rev-parse origin/next)
          echo "develop_sha=$DEVELOP_SHA" >> "$GITHUB_OUTPUT"
          if git merge-base --is-ancestor "$DEVELOP_SHA" "$NEXT_SHA"; then
            echo "in_sync=true" >> "$GITHUB_OUTPUT"
          else
            echo "in_sync=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Check for existing open sync PR
        id: existing_pr
        if: steps.sync_check.outputs.in_sync == 'false'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          PR_NUMBER=$(gh pr list --base next --label "sync" --state open )
          if [ -n "$PR_NUMBER" ]; then
            echo "exists=true" >> "$GITHUB_OUTPUT"
          else
            echo "exists=false" >> "$GITHUB_OUTPUT"
          fi

      - name: Fail if sync PR already open
        if: steps.existing_pr.outputs.exists == 'true'
        run: |
          echo "A sync PR is already open and unmerged. Merge or close it before a new sync can run."
          exit 1

      - name: Test merge (dry run)
        id: dry_run
        if: steps.existing_pr.outputs.exists == 'false'
        run: |
          TMPDIR=$(mktemp -d)
          git worktree add "$TMPDIR" origin/next
          cd "$TMPDIR"
          git merge --no-commit --no-ff origin/develop 2>&1 | tee /tmp/merge_output.txt
          MERGE_EXIT=${PIPESTATUS[0]}
          git merge --abort 2>/dev/null || true
          cd "$GITHUB_WORKSPACE"
          git worktree remove --force "$TMPDIR"
          if [ $MERGE_EXIT -eq 0 ]; then
            echo "has_conflicts=false" >> "$GITHUB_OUTPUT"
          else
            echo "has_conflicts=true" >> "$GITHUB_OUTPUT"
            CONFLICT_FILES=$(grep "^CONFLICT" /tmp/merge_output.txt | sed 's/^CONFLICT ([^)]*): //' | head -20)
            {
              echo "conflict_files<<EOF"
              echo "$CONFLICT_FILES"
              echo "EOF"
            } >> "$GITHUB_OUTPUT"
          fi

      - name: Create sync branch
        id: create_branch
        if: steps.existing_pr.outputs.exists == 'false'
        run: |
          DATE=$(date -u +%Y%m%d)
          BRANCH="sync/develop-into-next-${DATE}"
          echo "branch=$BRANCH" >> "$GITHUB_OUTPUT"
          git checkout -b "$BRANCH" origin/next
          if [ "${{ steps.dry_run.outputs.has_conflicts }}" == "true" ]; then
            git merge --no-edit origin/develop || true
            git add -A
            git commit -m "chore: sync develop to next -- NEEDS CONFLICT RESOLUTION" || true
          else
            git merge --no-edit origin/develop
          fi
          git push origin "$BRANCH"

      - name: Prepare PR body
        id: pr_body
        if: steps.create_branch.conclusion == 'success'
        run: |
          if [ "${{ steps.dry_run.outputs.has_conflicts }}" == "true" ]; then
            printf 'Conflicts detected from develop, action needed\n\n### Conflicting files\n\n```\n%s\n```\n' "${{ steps.dry_run.outputs.conflict_files }}" > /tmp/pr_body.md
            echo "title=[skip ci] Sync develop to next - conflicts" >> "$GITHUB_OUTPUT"
          else
            printf 'Clean synchronisation to next, no issues detected\n' > /tmp/pr_body.md
            echo "title=[skip ci] Sync develop to next" >> "$GITHUB_OUTPUT"
          fi

      - name: Open sync PR
        if: steps.create_branch.conclusion == 'success'
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          gh pr create --base next --head "${{ steps.create_branch.outputs.branch }}" --title "${{ steps.pr_body.outputs.title }}" --body-file /tmp/pr_body.md --label "sync" --reviewer "MonoGame/maintainers"