#!/bin/bash
# AI-Powered MR Description Generator
# Analyzes git commits and generates professional MR description using Gemini
set -euo pipefail
# Args
SOURCE_BRANCH="${1:-}"
TARGET_BRANCH="${2:-main}"
if [[ -z "$SOURCE_BRANCH" ]]; then
echo "Usage: $0 <source-branch> [target-branch]"
echo "Example: $0 feature/new-api main"
exit 1
fi
# Get commit diff
COMMITS=$(git log "$TARGET_BRANCH..$SOURCE_BRANCH" --pretty=format:"- %s (%h)" 2>/dev/null || echo "")
FILES=$(git diff --name-status "$TARGET_BRANCH...$SOURCE_BRANCH" | head -20)
STATS=$(git diff --shortstat "$TARGET_BRANCH...$SOURCE_BRANCH")
if [[ -z "$COMMITS" ]]; then
echo "Error: No commits found between $TARGET_BRANCH and $SOURCE_BRANCH"
exit 1
fi
# Create prompt for Gemini
PROMPT=$(cat <<EOF
You are a technical writer creating a GitLab Merge Request description.
**Context:**
- Project: GitLab MCP Server (TypeScript)
- Target audience: Developers who will review this MR
- Goal: Clear, professional, actionable description
**Commits:**
$COMMITS
**Changed files:**
$FILES
**Stats:**
$STATS
**Task:**
Generate a professional MR description following this format:
## Summary
[One-sentence summary of what this MR does]
## Changes
- [Bullet point of each major change]
- [Include WHY, not just WHAT]
## Testing
- [How was this tested?]
- [What test cases were added?]
## Breaking Changes
[List any breaking changes, or "None"]
## Checklist
- [ ] Tests added/updated
- [ ] Documentation updated
- [ ] Changelog updated (if applicable)
**Rules:**
- Be concise but informative
- Focus on WHY and IMPACT, not just WHAT
- Use technical language but stay readable
- If commits mention issue numbers (e.g., #123), include them
- Identify potential breaking changes from code changes
- Suggest appropriate labels (bug, enhancement, documentation, etc.)
Output ONLY the markdown description, no extra commentary.
EOF
)
# Run Gemini
echo "🤖 Generating MR description using Gemini CLI..."
echo "$PROMPT" | gemini - --output /tmp/mr_description.md 2>/dev/null || {
echo "Error: Gemini CLI failed. Install: https://github.com/google-gemini/generative-ai-python"
exit 1
}
# Output result
cat /tmp/mr_description.md
echo ""
echo "✅ Description generated! Copy above for your MR."
echo "Tip: Add --copy flag to copy to clipboard (requires xclip/pbcopy)"
