PR Command

Create a pull request with automatic base branch detection from conversation history, git log, or repository default.

Usage

• /pr - Create PR with auto-detected base branch
• /pr <target-branch> - Create PR targeting the specified branch

Steps

1. Verify Current State

git status
git branch --show-current

Ensure you're on a feature branch (not main/master/develop).

2. Determine Base Branch

Priority order for base branch detection:

1. Explicit argument: If <target-branch> is provided, use it directly
2. Conversation context: Search conversation history for mentions of:

• "based on", "branch from", "create branch from"
• PR context or issue references that mention a target branch
• Recent git commands showing branch creation

3. Git history: Auto-detect from git log and merge-base
4. Repository default: Use the default branch as fallback

Conversation History Check

Search the current conversation for clues about the base branch:

• Look for phrases like "create branch from develop", "based on feature-x"
• Check if user mentioned which branch they started from
• Look for issue/PR context that indicates the target

Git History Detection

# Fetch latest remote refs
git fetch origin

# Find merge-base with candidate branches
for branch in main master develop staging; do
  git merge-base HEAD origin/$branch 2>/dev/null && echo "Found: $branch"
done

# Check which branch has the closest merge-base
# The branch with most recent common ancestor is likely the parent

Repository Default Fallback

# Get the default branch
gh repo view --json defaultBranchRef --jq '.defaultBranchRef.name'

3. Check for Existing PR

gh pr list --head $(git branch --show-current)

If PR exists, ask user if they want to view or update it.

4. Analyze Changes

# Get commits
git log origin/<base-branch>..HEAD --oneline

# Get file changes
git diff origin/<base-branch>..HEAD --stat

5. Confirm with User

Before creating, confirm:

• Current branch: <branch-name>
• Target base branch: <base-branch> (with detection method: "specified", "from conversation", "auto-detected", or "default")
• Commits: Number of commits to include
• Suggested PR title: Based on commits/branch name

6. Push and Create PR

# Push if needed
git push -u origin $(git branch --show-current)

# Create PR
gh pr create \
  --base <base-branch> \
  --title "<title>" \
  --body "$(cat <<'EOF'
## Summary
<description>

## Changes
- <change 1>
- <change 2>

## Test Plan
<testing instructions>
EOF
)"

7. Report Result

Display:

• PR URL
• PR number
• Base branch (and how it was determined)
• Head branch

Detection Logic

The command uses this logic to find the base branch:

1. User-specified: Highest priority - use the argument directly
2. Conversation analysis: Check conversation for branch context
3. Git merge-base: Find closest common ancestor with candidate branches
4. Default branch: Ultimate fallback using gh repo view

If detection is ambiguous, ask the user to clarify before creating the PR.

Important Notes

• Never assume main/master without verification
• Always inform user how the base branch was determined
• Verify branch is pushed before creating PR
• Include meaningful PR title and description