refactor: move diff into status folder

backend/app/git/status/diff.py

@@ -0,0 +1,29 @@
+import os
+import git
+import logging
+
+logger = logging.getLogger(__name__)
+
+def get_diff(repo_path, file_path):
+    try:
+        repo = git.Repo(repo_path)
+        branch = repo.active_branch.name
+
+        # Check if the file is untracked
+        untracked_files = repo.untracked_files
+        if file_path in untracked_files:
+            with open(os.path.join(repo.working_dir, file_path), 'r') as file:
+                content = file.read()
+            diff = "\n".join([f"+{line}" for line in content.splitlines()])
+        else:
+            # Check if the file is deleted
+            if not os.path.exists(os.path.join(repo.working_dir, file_path)):
+                diff = "-Deleted File"
+            else:
+                # Get the diff for modified files
+                diff = repo.git.diff(f'HEAD', file_path)
+
+        return diff
+    except Exception as e:
+        logger.error(f"Error getting diff for file {file_path}: {str(e)}", exc_info=True)
+        raise e