Fix bug with --pull

Author: kevinmbeaulieu

src/git_ai_summarize/summarize.py

@@ -19,7 +19,7 @@ async def summarize_async(diff_args, provider_name: str, model_name: str):
     """Summarize changes between commits."""
     try:
         # Get the diff
-        diff = get_git_diff(*diff_args)
+        diff = get_git_diff(diff_args)
         if diff is None:
             print(
                 f"Error: Could not generate diff for range {diff_args}")
@@ -120,7 +120,7 @@ def main():
                 print("Error: Could not get new HEAD")
                 sys.exit(1)
 
-            args.diff_args = f"{from_commit}..{to_commit}"
+            args.diff_args = [f"{from_commit}..{to_commit}"]
         else:
             if not args.diff_args:
                 parser.print_help()

src/git_ai_summarize/utils.py

@@ -9,10 +9,10 @@ def verify_git_repo():
         raise RuntimeError("Not a git repository")
 
 
-def get_git_diff(*args) -> Optional[str]:
+def get_git_diff(args) -> Optional[str]:
     """Get the diff between commits with optional arguments."""
     try:
-        cmd = ['git', 'diff'] + list(args)
+        cmd = ['git', 'diff'] + args
         result = subprocess.run(
             cmd,
             capture_output=True,