Auto PR Description

#!/bin/bash
# Auto PR Description Hook
# Generates a PR description template when 'gh pr create' is detected

COMMAND="$1"

# Only act on gh pr create commands
if ! echo "$COMMAND" | grep -q "gh pr create"; then
  exit 0
fi

# Skip if --body is already provided
if echo "$COMMAND" | grep -q -- "--body"; then
  exit 0
fi

# Get the base branch
BASE_BRANCH=$(git symbolic-ref refs/remotes/origin/HEAD 2>/dev/null | sed 's@^refs/remotes/origin/@@')
BASE_BRANCH=${BASE_BRANCH:-main}

# Gather commit messages since diverging from base
COMMITS=$(git log --oneline "$BASE_BRANCH"..HEAD 2>/dev/null)
if [ -z "$COMMITS" ]; then
  exit 0
fi

# Gather changed files summary
CHANGED_FILES=$(git diff --stat "$BASE_BRANCH"..HEAD 2>/dev/null | tail -1)

# Build description
DESCRIPTION="## Summary\n\n"
DESCRIPTION+="### Changes\n"
while IFS= read -r line; do
  DESCRIPTION+="- $line\n"
done <<< "$COMMITS"
DESCRIPTION+="\n### Stats\n$CHANGED_FILES\n"
DESCRIPTION+="\n## Test Plan\n- [ ] Tests pass locally\n- [ ] Manual verification\n"

echo "📝 Generated PR description from $(echo "$COMMITS" | wc -l | tr -d ' ') commit(s)"
echo "$DESCRIPTION"

exit 0

{
  "hooks": {
    "PreToolUse": [
      {
        "matcher": "Bash",
        "command": "./hooks/auto-pr-description.sh"
      }
    ]
  }
}