name: PR Summary Generator
on:
pull_request:
types: [opened, synchronize]
jobs:
pr-summary:
runs-on: ubuntu-latest
permissions:
pull-requests: write
contents: read
steps:
- uses: actions/checkout@v4
with:
fetch-depth: 0
- name: Get PR diff
id: get-diff
run: |
git fetch origin ${{ github.event.pull_request.base.ref }}
DIFF=$(git diff origin/${{ github.event.pull_request.base.ref }}..HEAD --name-only)
echo "files_changed<<EOF" >> $GITHUB_OUTPUT
echo "$DIFF" >> $GITHUB_OUTPUT
echo "EOF" >> $GITHUB_OUTPUT
# Get detailed diff for analysis
DETAILED_DIFF=$(git diff origin/${{ github.event.pull_request.base.ref }}..HEAD)
echo "detailed_diff<<EOF" >> $GITHUB_OUTPUT
echo "$DETAILED_DIFF" >> $GITHUB_OUTPUT
echo "EOF" >> $GITHUB_OUTPUT
- name: Generate PR Summary
id: generate-summary
run: |
python3 << 'EOF'
import os
import json
import requests
# Prepare the prompt for OpenAI
diff_content = """${{ steps.get-diff.outputs.detailed_diff }}"""
files_changed = """${{ steps.get-diff.outputs.files_changed }}"""
# Truncate diff if too long (OpenAI has token limits)
if len(diff_content) > 8000:
diff_content = diff_content[:8000] + "\n\n... (truncated for length)"
prompt = f"""
Analyze this pull request and provide a comprehensive summary:
Files changed:
{files_changed}
Detailed changes:
{diff_content}
Please provide:
1. A brief summary of what this PR does
2. Key changes made
3. Potential impact and risks
4. Any recommendations for reviewers
Format the response in markdown.
"""
# Make API call to OpenAI
headers = {
'Authorization': f'Bearer ${{ secrets.OPENAI_API_KEY }}',
'Content-Type': 'application/json'
}
data = {
'model': 'gpt-3.5-turbo',
'messages': [
{'role': 'system', 'content': 'You are a senior software engineer reviewing code changes. Provide clear, actionable feedback.'},
{'role': 'user', 'content': prompt}
],
'max_tokens': 1000,
'temperature': 0.3
}
try:
response = requests.post('https://api.openai.com/v1/chat/completions',
headers=headers, json=data)
if response.status_code == 200:
result = response.json()
summary = result['choices'][0]['message']['content']
# Write summary to file
with open('pr_summary.md', 'w') as f:
f.write(summary)
print("✅ PR summary generated successfully")
else:
print(f"❌ OpenAI API error: {response.status_code}")
with open('pr_summary.md', 'w') as f:
f.write("## PR Summary\n\nAutomatic summary generation failed. Please review manually.")
except Exception as e:
print(f"❌ Error generating summary: {e}")
with open('pr_summary.md', 'w') as f:
f.write("## PR Summary\n\nAutomatic summary generation failed. Please review manually.")
EOF
env:
OPENAI_API_KEY: ${{ secrets.OPENAI_API_KEY }}
- name: Comment PR with summary
uses: actions/github-script@v7
with:
script: |
const fs = require('fs');
const summary = fs.readFileSync('pr_summary.md', 'utf8');
// Find existing comment
const comments = await github.rest.issues.listComments({
owner: context.repo.owner,
repo: context.repo.repo,
issue_number: context.issue.number,
});
const existingComment = comments.data.find(comment =>
comment.body.includes('🤖 **Automated PR Summary**')
);
const body = `🤖 **Automated PR Summary**\n\n${summary}\n\n---\n*This summary was generated using OpenAI GPT-3.5*`;
if (existingComment) {
await github.rest.issues.updateComment({
owner: context.repo.owner,
repo: context.repo.repo,
comment_id: existingComment.id,
body: body
});
} else {
await github.rest.issues.createComment({
owner: context.repo.owner,
repo: context.repo.repo,
issue_number: context.issue.number,
body: body
});
}
