pr-merge-base

Smart Merge to Base Branch

Merge one or more PRs into the base branch (main/master) using queue-like sequencing.

Process

1. Detect base branch: Identify the default branch (main, master, or repo-specific) via git remote show origin or repo conventions.

2. Enumerate PRs: List all PRs to merge. For each, fetch the latest HEAD.

3. Create checkpoint: Record the current base branch tip as a rollback point.

   CHECKPOINT=$(git rev-parse HEAD)
   

4. Create integration branch: Work on a temporary branch to validate before touching base.

   git checkout -b merge-queue/<timestamp> <base>
   

5. Determine merge order:

   • If the user specifies an order, use that.
   • Otherwise, compute dependency/topological order (if PR B depends on PR A, merge A first).
   • If PRs are independent with no clear ordering, present the list and ask the user to confirm or reorder before proceeding.

6. Sequential merge with conflict handling — for each PR in order: a. Attempt git merge --no-ff <pr-branch> into the integration branch. b. If merge succeeds cleanly, continue to next PR. c. If conflicts occur:

   • Analyze each conflict file using difft and codebase context.
   • Apply resolution using structural understanding (prefer base for formatting, PR for logic).
   • If a conflict cannot be resolved with confidence, abort this merge (git merge --abort), stop and report the conflict to the user with both sides and a recommended resolution. d. After each successful merge, verify the build still passes (if build commands are available).

7. Validate integration branch: Once all PRs are merged on the integration branch, run full build/test suite if available.

8. Report results: Present the validated integration branch to the user. Do NOT advance the base branch automatically — only update base if the user explicitly requests it.

9. Abort conditions — stop the queue and report if:

   • A conflict cannot be safely auto-resolved.
   • A post-merge build/test fails.
   • A PR has been superseded or closed. Roll back: git checkout <base> && git branch -D merge-queue/<timestamp> — base remains untouched at checkpoint.

Output

Report for each PR: merged successfully, conflicts resolved (with details), or blocked (with reason).