fix: Use Compare API for commit count when Events API lacks data

GitHub Events API sometimes returns PushEvents without commits array.
Now uses Compare API (before...head) to get actual commit count and messages.

Author: cliff-de-tech

services/github_activity.py

@@ -115,11 +115,41 @@ def parse_event(event):
         commits_data = payload.get('commits', [])
         commits_count = len(commits_data)
 
+        # If commits array is empty but we have head/before SHAs, try Compare API
+        # GitHub Events API sometimes doesn't include commits array
+        if commits_count == 0:
+            head_sha = payload.get('head')
+            before_sha = payload.get('before')
+            
+            # If we have both SHAs, try to get commit count from Compare API
+            if head_sha and before_sha and before_sha != '0000000000000000000000000000000000000000':
+                try:
+                    headers = {'Accept': 'application/vnd.github.v3+json'}
+                    app_token = os.getenv('GITHUB_TOKEN')
+                    if app_token:
+                        headers['Authorization'] = f'token {app_token}'
+                    
+                    compare_url = f"{GITHUB_API}/repos/{repo}/compare/{before_sha}...{head_sha}"
+                    compare_resp = requests.get(compare_url, headers=headers, timeout=5)
+                    
+                    if compare_resp.status_code == 200:
+                        compare_data = compare_resp.json()
+                        commits_count = compare_data.get('total_commits', 0)
+                        # Get commit messages from compare
+                        compare_commits = compare_data.get('commits', [])
+                        commits_data = compare_commits  # Use for message extraction
+                        logger.info(f"Got {commits_count} commits from Compare API for {repo}")
+                except Exception as e:
+                    logger.warning(f"Compare API failed for {repo}: {e}")
+                    # Fall back to assuming at least 1 commit since there was a push
+                    commits_count = 1
+        
         # Extract commit messages for personalized posts (Pro feature)
         # Limit to 5 messages, truncate each to 100 chars
         commit_messages = []
         for commit in commits_data[:5]:
-            message = commit.get('message', '')
+            # Handle both Events API format and Compare API format
+            message = commit.get('message') or commit.get('commit', {}).get('message', '')
             # Take first line only and truncate
             first_line = message.split('\n')[0][:100]
             if first_line: