diff --git a/src/gdiffer/language_detector.py b/src/gdiffer/language_detector.py
index c50200f..156c2f8 100644
--- a/src/gdiffer/language_detector.py
+++ b/src/gdiffer/language_detector.py
@@ -1,166 +1,157 @@
-"""Language detection for code files."""
-
-
-
 class LanguageDetector:
-    """Detects programming language from file extensions and content."""
-
     EXTENSION_MAP = {
-        'py': 'python',
-        'pyw': 'python',
-        'pyx': 'python',
-        'js': 'javascript',
-        'mjs': 'javascript',
-        'cjs': 'javascript',
-        'jsx': 'javascript',
-        'ts': 'typescript',
-        'tsx': 'typescript',
-        'mts': 'typescript',
-        'cts': 'typescript',
-        'java': 'java',
-        'kt': 'kotlin',
-        'kts': 'kotlin',
-        'go': 'go',
-        'rs': 'rust',
-        'c': 'c',
-        'h': 'c',
-        'cpp': 'cpp',
-        'cc': 'cpp',
-        'cxx': 'cpp',
-        'hpp': 'cpp',
-        'hxx': 'cpp',
-        'cs': 'csharp',
-        'rb': 'ruby',
-        'erb': 'ruby',
-        'php': 'php',
-        'swift': 'swift',
-        'm': 'objective-c',
-        'mm': 'objective-c',
-        'scala': 'scala',
-        'sc': 'scala',
-        'jl': 'julia',
-        'r': 'r',
-        'R': 'r',
-        'lua': 'lua',
-        'pl': 'perl',
-        'pm': 'perl',
-        'sql': 'sql',
-        'sh': 'bash',
-        'bash': 'bash',
-        'zsh': 'bash',
-        'fish': 'bash',
-        'yaml': 'yaml',
-        'yml': 'yaml',
-        'json': 'json',
-        'xml': 'xml',
-        'html': 'html',
-        'htm': 'html',
-        'css': 'css',
-        'scss': 'scss',
-        'sass': 'sass',
-        'less': 'less',
-        'md': 'markdown',
-        'markdown': 'markdown',
-        'txt': 'text',
-        'dockerfile': 'dockerfile',
-        'Dockerfile': 'dockerfile',
+        "py": "python",
+        "pyw": "python",
+        "pyx": "python",
+        "js": "javascript",
+        "mjs": "javascript",
+        "cjs": "javascript",
+        "jsx": "javascript",
+        "ts": "typescript",
+        "tsx": "typescript",
+        "mts": "typescript",
+        "cts": "typescript",
+        "java": "java",
+        "kt": "kotlin",
+        "kts": "kotlin",
+        "go": "go",
+        "rs": "rust",
+        "c": "c",
+        "h": "c",
+        "cpp": "cpp",
+        "cc": "cpp",
+        "cxx": "cpp",
+        "hpp": "cpp",
+        "hxx": "cpp",
+        "cs": "csharp",
+        "rb": "ruby",
+        "erb": "ruby",
+        "php": "php",
+        "swift": "swift",
+        "m": "objective-c",
+        "mm": "objective-c",
+        "scala": "scala",
+        "sc": "scala",
+        "jl": "julia",
+        "r": "r",
+        "R": "r",
+        "lua": "lua",
+        "pl": "perl",
+        "pm": "perl",
+        "sql": "sql",
+        "sh": "bash",
+        "bash": "bash",
+        "zsh": "bash",
+        "fish": "bash",
+        "yaml": "yaml",
+        "yml": "yaml",
+        "json": "json",
+        "xml": "xml",
+        "html": "html",
+        "htm": "html",
+        "css": "css",
+        "scss": "scss",
+        "sass": "sass",
+        "less": "less",
+        "md": "markdown",
+        "markdown": "markdown",
+        "txt": "text",
+        "dockerfile": "dockerfile",
+        "Dockerfile": "dockerfile",
     }
 
     CONTENT_PATTERNS = {
-        'python': [
-            r'^import\\s+\\w+',
-            r'^from\\s+\\w+\\s+import',
-            r'^def\\s+\\w+\\s*\\(',
-            r'^class\\s+\\w+\\s*[:\\(]',
-            r'^if\\s+__name__\\s*==\\s*[\\'\\"]__main__[\\'\\"]',
+        "python": [
+            r"^import\\s+\\w+",
+            r"^from\\s+\\w+\\s+import",
+            r"^def\\s+\\w+\\s*\\(",
+            r"^class\\s+\\w+\\s*[:\\(]",
+            r"^if\\s+__name__\\s*==\\s*['\"]__main__['\"]",
         ],
-        'javascript': [
-            r'^const\\s+\\w+\\s*=',
-            r'^let\\s+\\w+\\s*=',
-            r'^var\\s+\\w+\\s*=',
-            r'^function\\s+\\w+\\s*\\(',
-            r'=>\\s*\\{',
-            r'import\\s+.*\\s+from',
-            r'export\\s+(default\\s+)?',
+        "javascript": [
+            r"^const\\s+\\w+\\s*=",
+            r"^let\\s+\\w+\\s*=",
+            r"^var\\s+\\w+\\s*=",
+            r"^function\\s+\\w+\\s*\\(",
+            r"=>\\s*\\{",
+            r"import\\s+.*\\s+from",
+            r"export\\s+(default\\s+)?",
         ],
-        'typescript': [
-            r'^interface\\s+\\w+\\s*\\{',
-            r'^type\\s+\\w+\\s*=',
-            r':\\s*(string|number|boolean|any|void|null|undefined)',
-            r'<[A-Z]\\w*>',
+        "typescript": [
+            r"^interface\\s+\\w+\\s*\\{",
+            r"^type\\s+\\w+\\s*=",
+            r":\\s*(string|number|boolean|any|void|null|undefined)",
+            r"<[A-Z]\\w*>",
         ],
-        'java': [
-            r'^package\\s+[\\w.]+;',
-            r'^import\\s+[\\w.]+;',
-            r'^public\\s+(class|interface|enum)\\s+\\w+',
-            r'^private\\s+(static\\s+)?(final\\s+)?\\w+\\s+\\w+;',
+        "java": [
+            r"^package\\s+[\\w.]+;",
+            r"^import\\s+[\\w.]+;",
+            r"^public\\s+(class|interface|enum)\\s+\\w+",
+            r"^private\\s+(static\\s+)?(final\\s+)?\\w+\\s+\\w+;",
         ],
-        'go': [
-            r'^package\\s+\\w+',
-            r'^import\\s+\\(',
-            r'func\\s+\\w+\\s*\\(',
-            r':=',
-            r'go\\s+func',
+        "go": [
+            r"^package\\s+\\w+",
+            r"^import\\s*\\(",
+            r"func\\s+\\w+\\s*\\(",
+            r":=",
+            r"go\\s+func",
         ],
-        'rust': [
-            r'^fn\\s+\\w+\\s*\\(',
-            r'^impl\\s+\\w+',
-            r'^struct\\s+\\w+',
-            r'^enum\\s+\\w+',
-            r'let\\s+mut\\s+\\w+',
-            r'->\\s*\\w+',
+        "rust": [
+            r"^fn\\s+\\w+\\s*\\(",
+            r"^impl\\s+\\w+",
+            r"^struct\\s+\\w+",
+            r"^enum\\s+\\w+",
+            r"let\\s+mut\\s+\\w+",
+            r"->\\s*\\w+",
         ],
-        'c': [
-            r'#include\\s*<',
-            r'#include\\s*"',
-            r'int\\s+main\\s*\\(',
-            r'struct\\s+\\w+\\s*\\{',
-            r'void\\s+\\*?\\s*\\w+\\s*\\(',
+        "c": [
+            r"#include\\s*<",
+            r"#include\\s*\"",
+            r"int\\s+main\\s*\\(",
+            r"struct\\s+\\w+\\s*\\{",
+            r"void\\s+\\*?\\s*\\w+\\s*\\(",
         ],
-        'cpp': [
-            r'#include\\s*<',
-            r'#include\\s*"',
-            r'class\\s+\\w+\\s*(:\\s*public)?',
-            r'std::\\w+',
-            r'using\\s+namespace\\s+std',
+        "cpp": [
+            r"#include\\s*<",
+            r"#include\\s*\"",
+            r"class\\s+\\w+\\s*(:\\s*public)?",
+            r"std::\\w+",
+            r"using\\s+namespace\\s+std",
         ],
-        'ruby': [
-            r'^require\\s+[\\'\\"]',
-            r'^class\\s+\\w+(\\s*<\\s*\\w+)?',
-            r'^module\\s+\\w+',
-            r'def\\s+\\w+',
-            r'puts\\s+',
-            r'puts!',
+        "ruby": [
+            r"^require\\s+['\"]",
+            r"^class\\s+\\w+(\\s*<\\s*\\w+)?",
+            r"^module\\s+\\w+",
+            r"def\\s+\\w+",
+            r"puts\\s+",
+            r"puts!",
         ],
-        'php': [
-            r'<\\?php',
-            r'\\$\\w+\\s*=',
-            r'function\\s+\\w+\\s*\\(',
-            r'class\\s+\\w+\\s*\\{',
+        "php": [
+            r"<\?php",
+            r"\$\\w+\\s*=",
+            r"function\\s+\\w+\\s*\\(",
+            r"class\\s+\\w+\\s*\\{",
         ],
     }
 
     def __init__(self):
         self._tree_sitter_languages = {}
 
-    def detect_from_filename(self, filename: str) -> str | None:
-        """Detect language from file extension."""
-        if '.' not in filename:
+    def detect_from_filename(self, filename):
+        if "." not in filename:
             return None
 
-        ext = filename.rsplit('.', 1)[-1].lower()
+        ext = filename.rsplit(".", 1)[-1].lower()
         return self.EXTENSION_MAP.get(ext)
 
-    def detect_from_content(self, content: str) -> str | None:
-        """Detect language from file content patterns."""
-        first_lines = '\\n'.join(content.splitlines()[:50])
+    def detect_from_content(self, content):
+        first_lines = "\n".join(content.splitlines()[:50])
 
-        scores: dict[str, int] = {}
+        scores = {}
 
         for lang, patterns in self.CONTENT_PATTERNS.items():
             score = 0
             for pattern in patterns:
-                import re
                 matches = len(re.findall(pattern, first_lines, re.MULTILINE))
                 score += matches
 
@@ -173,12 +164,11 @@ class LanguageDetector:
 
         return None
 
-    def detect(self, filename: str, content: str = "") -> str:
-        """Detect language from filename and optionally content."""
+    def detect(self, filename, content=""):
         ext_lang = self.detect_from_filename(filename)
 
         if ext_lang and ext_lang not in [
-            'text', 'markdown', 'json', 'yaml', 'xml', 'html', 'css', 'dockerfile'
+            "text", "markdown", "json", "yaml", "xml", "html", "css", "dockerfile"
         ]:
             if content:
                 content_lang = self.detect_from_content(content)
@@ -193,16 +183,13 @@ class LanguageDetector:
 
         return ext_lang or "text"
 
-    def get_supported_languages(self) -> list[str]:
-        """Return list of supported languages."""
+    def get_supported_languages(self):
         return sorted(set(self.EXTENSION_MAP.values()))
 
-    def is_language_supported(self, language: str) -> bool:
-        """Check if a language is supported."""
+    def is_language_supported(self, language):
         return language in self.get_supported_languages()
 
 
-def detect_language(filename: str, content: str = "") -> str:
-    """Detect programming language from filename and content."""
+def detect_language(filename, content=""):
     detector = LanguageDetector()
     return detector.detect(filename, content)