diff --git a/.gitignore b/.gitignore
index 284b0d2..719b928 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,4 @@
+**/__pycache__/
 models/*
 uv.lock
 
diff --git a/DescriptionOfDesign.md b/DescriptionOfDesign.md
index a0ebbb8..aa0d136 100644
--- a/DescriptionOfDesign.md
+++ b/DescriptionOfDesign.md
@@ -63,19 +63,20 @@
 - **Python 优先**：原生 Python SDK，类型提示完善
 - **性能优秀**：基于 Apache Arrow，查询速度快
 
-### 2.3 为什么选择 langchain-text-splitters（而非 chonkie）
+### 2.3 为什么选择 tree-sitter
 
-最初设计考虑使用 `chonkie` 实现语法感知分块，但经过实践发现：
+使用 `tree-sitter` 实现 AST 级别的语义感知分块：
 
 | 方案 | 优势 | 劣势 |
 |------|------|------|
-| chonkie | 语法感知分块 | 需要额外下载 GPT-2 tokenizer，初始化慢 |
-| langchain-text-splitters | 无需额外模型、纯规则、速度快 | 非语法感知 |
+| tree-sitter | AST 感知、语义完整、不跨类/函数切割 | 依赖语言 parser |
+| langchain-text-splitters | 轻量、规则简单 | chunk_size 优先，会切割语义单元 |
 
-**最终选择 langchain-text-splitters**：
-- 对于 RAG 场景，分块精度不是最关键因素
-- langchain 的方案更加轻量，启动更快
-- 代码按自然段落（函数、类）边界切分，效果足够好
+**最终选择 tree-sitter**：
+- 代码以**类、函数**等完整语义单元为最小块
+- 超过 token 限制时，递归在子节点级别拆分
+- 支持 40+ 编程语言（通过 tree-sitter-languages）
+- 底层通过 ctypes 加载 parser，绕过语言绑定兼容性问题
 
 ### 2.4 为什么使用 Qwen3-Embedding-0.6B
 
@@ -187,7 +188,7 @@
 | 模块 | 职责 | 依赖 |
 |------|------|------|
 | `cli.py` | 命令行入口，参数解析 | click |
-| `chunker.py` | 代码分块处理 | langchain-text-splitters |
+| `chunker.py` | 代码分块处理 | tree-sitter, tree-sitter-languages |
 | `embedder.py` | 文本向量化 | sentence-transformers |
 | `db.py` | 向量数据库操作 | lancedb, pyarrow |
 | `commands/*.py` | 各命令实现 | cli, chunker, embedder, db |
@@ -199,12 +200,13 @@
 
 ### 4.1 代码分块算法
 
-**实现**：使用 langchain 的 `RecursiveCharacterTextSplitter`，支持 29 种编程语言的语法感知分块。
+**实现**：使用 tree-sitter 进行 AST 级别的语义分块，支持 40+ 编程语言。
 
-**分块参数**：
-- `chunk_size=2000`：每块约 2000 字符
-- `chunk_overlap=200`：块之间保留 200 字符重叠，保证上下文连贯
-- `separators`：按语言自动确定，按语义优先级（类 > 函数 > 空行段落 > 换行 > 空格 > 字符）递减
+**分块策略**：
+- **源码文件**：使用 tree-sitter 解析为 AST，按 `class_definition`、`function_definition` 等语义节点提取完整块
+- **非语义单元文件**（如 Markdown）：使用 tiktoken 按行分块
+- **超大语义单元**（>4000 tokens）：递归在子节点级别拆分，保证每个块不超过大小限制
+- **Parser 加载**：通过 ctypes 从 `languages.so` 直接加载，绕过语言绑定兼容性问题
 
 ### 4.2 向量化策略
 
diff --git a/README.md b/README.md
index 4244d5e..91b36fc 100644
--- a/README.md
+++ b/README.md
@@ -11,7 +11,7 @@
 - 🚀 **零配置**：嵌入式数据库，安装即用
 - 🔒 **本地优先**：所有数据存储在本地，不上传到外部服务器
 - 🔍 **语义搜索**：通过自然语言查询相关代码片段
-- 📦 **多语言支持**：支持 Python、Rust、C++、Go、JavaScript、TypeScript 等 29 种编程语言
+- 📦 **多语言支持**：支持 Python、Rust、C++、Go、JavaScript、TypeScript 等 40+ 种编程语言
 - ⚡ **极速响应**：搜索延迟 < 100ms
 - 🤖 **AI 友好**：输出格式专为 AI 消费设计
 
@@ -48,17 +48,34 @@ cp opencode-skill/SKILL.md ~/.config/opencode/skills/ocrag/
 # 添加文件到知识库
 uv run ocrag add ./src/main.py
 
-# 递归添加整个目录
+# 递归添加整个目录（自动应用 .gitignore + 二进制文件过滤）
 uv run ocrag add ./src/ --recursive
 
+# 排除特定文件
+uv run ocrag add ./src/ --recursive --exclude "**/__pycache__" "**/test_*.py"
+
+# 只添加特定类型的文件
+uv run ocrag add ./src/ --recursive --include "*.py" "*.rs"
+
+# 禁用 .gitignore 过滤
+uv run ocrag add ./src/ --recursive --no-ignore
+
 # 搜索相关代码
 uv run ocrag search "如何实现用户认证"
 
 # 列出知识库中的文件
 uv run ocrag list
 
+# 使用通配符筛选列表
+uv run ocrag list "*.py"              # 仅列出 Python 文件
+uv run ocrag list "src/**"            # 仅列出 src 目录下的文件
+
 # 删除文件
 uv run ocrag remove ./src/main.py
+
+# 使用通配符批量删除
+uv run ocrag remove "**/test_*.py"     # 删除所有测试文件
+uv run ocrag remove "src/**/*.js"       # 删除 src 下所有 JS 文件
 ```
 
 ### OpenCode 集成
diff --git a/opencode-skill/SKILL.md b/opencode-skill/SKILL.md
index 00ad13c..33b78ca 100644
--- a/opencode-skill/SKILL.md
+++ b/opencode-skill/SKILL.md
@@ -23,12 +23,19 @@ description: 代码库 RAG 技能，用于向知识库添加代码或搜索已
 2. 获得返回的代码片段后，结合片段内容回答用户
 3. 如果结果不相关，可以告知用户未找到，并建议添加更多代码
 
+### 管理知识库
+- `rag_list` 可选传入 pattern 参数进行通配符筛选，如 `"*.py"` 或 `"src/**"`
+- `rag_remove` 支持通配符模式批量删除，如 `"**/test_*.py"` 删除所有测试文件
+
 ## 示例
 - 用户："帮我记住这个文件的知识" → 调用 `rag_add` 传入当前文件路径
 - 用户："认证模块是怎么实现的？" → 调用 `rag_search` query="认证模块实现"
 - 用户："把 ./src 目录下所有 Python 文件加入知识库" → 调用 `rag_add` paths=["./src"] recursive=true
+- 用户："知识库里有几个测试文件？" → 调用 `rag_list` pattern="**/test_*.py"
+- 用户："把测试文件都删了" → 调用 `rag_remove` pattern="**/test_*.py"
 
 ## 注意事项
 - 搜索结果会显示代码片段的来源文件
 - 可以通过 top_k 参数调整返回结果数量
 - 添加文件后，搜索会立即包含新添加的内容
+- remove 和 list 支持 fnmatch 通配符：`*` 匹配任意字符，`**` 匹配路径分隔符
diff --git a/pyproject.toml b/pyproject.toml
index 5231c48..f0d1853 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,19 +1,29 @@
 [project]
-name = "project"
+name = "ocrag"
 version = "0.1.0"
-description = "Add your description here"
+description = "Local code knowledge base RAG plugin for OpenCode"
 readme = "README.md"
 requires-python = ">=3.12"
 dependencies = [
-    "chonkie>=1.6.2",
+    "tree-sitter>=0.21",
+    "tree-sitter-languages>=1.10",
     "click>=8.3.2",
     "lancedb>=0.30.2",
+    "pathspec>=0.12.0",
     "sentence-transformers>=5.4.1",
     "sentencepiece>=0.2.1",
     "tiktoken>=0.12.0",
     "tokenizers>=0.22.2",
+    "tqdm>=4.66.0",
 ]
 
+[project.scripts]
+ocrag = "ocrag.cli:main"
+
+[build-system]
+requires = ["hatchling"]
+build-backend = "hatchling.build"
+
 [dependency-groups]
 dev = [
     "pytest>=9.0.3",
diff --git a/src/ocrag/chunker.py b/src/ocrag/chunker.py
index e720fb2..9d91abf 100644
--- a/src/ocrag/chunker.py
+++ b/src/ocrag/chunker.py
@@ -1,47 +1,478 @@
 """
 代码分块模块
 
-使用 langchain_text_splitters 进行语言感知分块。
-支持 29 种编程语言的语法感知分块，tiktoken 已内置，无需额外下载。
+使用 tree-sitter 进行语义感知分块。
+源码按类/函数等语义单元切分，保证每个 chunk 都是完整的语义块。
+非代码文件使用简单分块。
 """
 
+import ctypes
+import os
+import re
+import warnings
 from pathlib import Path
-from typing import List, Dict, Any
+
+warnings.filterwarnings(
+    "ignore",
+    message="int argument support is deprecated",
+    category=DeprecationWarning,
+)
+from typing import List, Dict, Any, Optional, Tuple
 
 try:
-    from langchain_text_splitters import Language, RecursiveCharacterTextSplitter
+    import tree_sitter
+    from tree_sitter import Parser, Language, Node
 except ImportError:
-    raise ImportError(
-        "请安装 langchain-text-splitters: uv pip install langchain-text-splitters"
-    )
+    raise ImportError("请安装 tree-sitter: uv pip install tree-sitter")
 
 LANGUAGE_MAP = {
-    ".py": Language.PYTHON,
-    ".rs": Language.RUST,
-    ".cpp": Language.CPP,
-    ".cc": Language.CPP,
-    ".cxx": Language.CPP,
-    ".go": Language.GO,
-    ".java": Language.JAVA,
-    ".js": Language.JS,
-    ".ts": Language.TS,
-    ".jsx": Language.JS,
-    ".tsx": Language.TS,
-    ".c": Language.C,
-    ".h": Language.C,
-    ".hpp": Language.CPP,
-    ".rb": Language.RUBY,
-    ".swift": Language.SWIFT,
-    ".kt": Language.KOTLIN,
-    ".md": Language.MARKDOWN,
-    ".txt": None,
+    ".py": "python",
+    ".rs": "rust",
+    ".cpp": "cpp",
+    ".cc": "cpp",
+    ".cxx": "cpp",
+    ".go": "go",
+    ".java": "java",
+    ".js": "javascript",
+    ".ts": "typescript",
+    ".jsx": "javascript",
+    ".tsx": "typescript",
+    ".c": "c",
+    ".h": "cpp",
+    ".hpp": "cpp",
+    ".rb": "ruby",
+    ".swift": "swift",
+    ".kt": "kotlin",
+    ".sh": "bash",
+    ".bash": "bash",
+    ".zsh": "bash",
+    ".lua": "lua",
+    ".php": "php",
+    ".scala": "scala",
+    ".cs": "c_sharp",
+    ".r": "r",
+    ".R": "r",
+    ".sql": "sql",
+    ".toml": "toml",
+    ".yaml": "yaml",
+    ".yml": "yaml",
+    ".json": "json",
+    ".xml": "xml",
+    ".html": "html",
+    ".htm": "html",
+    ".css": "css",
+    ".scss": "css",
+    ".less": "css",
+    ".md": "markdown",
+    ".rst": "rst",
+    ".dockerfile": "dockerfile",
+    ".tf": "hcl",
+    ".hs": "haskell",
+    ".ex": "elixir",
+    ".exs": "elixir",
+    ".erl": "erlang",
+    ".ml": "ocaml",
+    ".mli": "ocaml",
+    ".fs": "fsharp",
+    ".fsx": "fsharp",
 }
 
+SEMANTIC_UNITS = {
+    "python": [
+        "function_definition",
+        "class_definition",
+        "async_function_definition",
+        "decorated_definition",
+    ],
+    "rust": [
+        "function_item",
+        "struct_item",
+        "impl_item",
+        "enum_item",
+        "trait_item",
+        "type_item",
+        "macro_invocation",
+        "macro_rule",
+    ],
+    "cpp": [
+        "class_specifier",
+        "struct_specifier",
+        "namespace_definition",
+        "function_definition",
+        "method_declaration",
+        "constructor_initializer",
+        "template_declaration",
+    ],
+    "c": [
+        "struct_specifier",
+        "union_specifier",
+        "enum_specifier",
+        "function_definition",
+        "type_definition",
+    ],
+    "go": [
+        "function_declaration",
+        "method_declaration",
+        "type_declaration",
+        "const_declaration",
+        "var_declaration",
+    ],
+    "java": [
+        "class_declaration",
+        "interface_declaration",
+        "enum_declaration",
+        "record_declaration",
+        "method_declaration",
+    ],
+    "javascript": [
+        "class_declaration",
+        "function_declaration",
+        "arrow_function",
+        "method_definition",
+    ],
+    "typescript": [
+        "class_declaration",
+        "function_declaration",
+        "arrow_function",
+        "method_definition",
+        "interface_declaration",
+        "type_alias_declaration",
+        "enum_declaration",
+    ],
+    "ruby": [
+        "class",
+        "module",
+        "def",
+        "method",
+    ],
+    "swift": [
+        "class_declaration",
+        "struct_declaration",
+        "enum_declaration",
+        "protocol_declaration",
+        "function_declaration",
+        "method_declaration",
+    ],
+    "kotlin": [
+        "class_declaration",
+        "object_declaration",
+        "function_declaration",
+        "method_declaration",
+    ],
+    "scala": [
+        "class_definition",
+        "object_definition",
+        "trait_definition",
+        "function_definition",
+        "method_definition",
+    ],
+    "c_sharp": [
+        "class_declaration",
+        "struct_declaration",
+        "interface_declaration",
+        "enum_declaration",
+        "method_declaration",
+    ],
+    "go_mod": ["import_declaration"],
+    "bash": [
+        "function_definition",
+        "command",
+    ],
+    "lua": [
+        "function_declaration",
+        "local_function",
+        "assignment_statement",
+    ],
+    "php": [
+        "class_declaration",
+        "interface_declaration",
+        "trait_declaration",
+        "function_definition",
+        "method_declaration",
+    ],
+    "sql": [
+        "create_table_statement",
+        "create_index_statement",
+        "create_view_statement",
+        "create_trigger_statement",
+        "procedure_definition",
+        "function_definition",
+    ],
+    "toml": ["table"],
+    "yaml": ["block_mapping"],
+    "json": ["pair", "array"],
+    "html": [
+        "element",
+        "script_element",
+        "style_element",
+    ],
+    "css": ["rule_set", "at_rule"],
+    "markdown": ["section", "fenced_code_block"],
+    "rst": ["section", "directive"],
+    "dockerfile": ["from_instruction", "run_instruction", "cmd_instruction"],
+    "hcl": ["block", "attribute"],
+    "haskell": [
+        "type_declaration",
+        "data_declaration",
+        "function_definition",
+        "class_declaration",
+        "instance_declaration",
+    ],
+    "elixir": [
+        "module_definition",
+        "function_definition",
+        "def",
+        "defp",
+    ],
+    "erlang": [
+        "function_definition",
+        "module_definition",
+    ],
+    "ocaml": [
+        "value_definition",
+        "type_definition",
+        "module_definition",
+        "class_definition",
+    ],
+    "fsharp": [
+        "class_definition",
+        "module_definition",
+        "function_definition",
+        "type_definition",
+    ],
+    "r": [
+        "function_definition",
+        "assignment",
+    ],
+}
 
-def detect_language(file_path: str) -> Language | None:
-    """检测文件语言类型"""
-    ext = Path(file_path).suffix.lower()
-    return LANGUAGE_MAP.get(ext)
+MAX_CHUNK_CHARS = 8000
+MIN_CHUNK_CHARS = 100
+
+
+class TiktokenCounter:
+    _instance = None
+
+    def __new__(cls):
+        if cls._instance is None:
+            cls._instance = super().__new__(cls)
+            cls._instance._initialized = False
+        return cls._instance
+
+    def __init__(self):
+        if self._initialized:
+            return
+        import tiktoken
+
+        self._enc = tiktoken.encoding_for_model("gpt-4o")
+        self._initialized = True
+
+    def count(self, text: str) -> int:
+        return len(self._enc.encode(text))
+
+
+_token_counter = TiktokenCounter()
+
+
+def _find_languages_so() -> str:
+    import site
+
+    for path in site.getsitepackages() + [site.getusersitepackages()]:
+        so_path = os.path.join(path, "tree_sitter_languages", "languages.so")
+        if os.path.exists(so_path):
+            return so_path
+    for path in site.getsitepackages():
+        if os.path.exists(os.path.join(path, "tree_sitter_languages")):
+            return os.path.join(path, "tree_sitter_languages", "languages.so")
+    cache_dir = os.path.expanduser("~/.cache/uv/archive-v0")
+    if os.path.exists(cache_dir):
+        for entry in os.listdir(cache_dir):
+            entry_path = os.path.join(
+                cache_dir, entry, "tree_sitter_languages", "languages.so"
+            )
+            if os.path.exists(entry_path):
+                return entry_path
+    raise FileNotFoundError(
+        "无法找到 tree-sitter-languages 的 languages.so。"
+        " 请确保已安装 tree-sitter-languages。"
+    )
+
+
+_lib = None
+
+
+def _get_lib() -> ctypes.CDLL:
+    global _lib
+    if _lib is None:
+        so_path = _find_languages_so()
+        _lib = ctypes.CDLL(so_path)
+    return _lib
+
+
+_parsers_cache: Dict[str, Parser] = {}
+
+
+def get_parser(language_name: str) -> Tuple[Parser, Language]:
+    if language_name in _parsers_cache:
+        return _parsers_cache[language_name], _parsers_cache[f"_lang_{language_name}"]
+
+    lib = _get_lib()
+    symbol_name = f"tree_sitter_{language_name}"
+    if not hasattr(lib, symbol_name):
+        raise ValueError(f"不支持的语言: {language_name}")
+
+    func = getattr(lib, symbol_name)
+    func.argtypes = []
+    func.restype = ctypes.c_void_p
+    ptr = func()
+    lang = Language(ptr)  # type: ignore[call-arg]
+    parser = Parser(lang)
+    _parsers_cache[language_name] = parser
+    _parsers_cache[f"_lang_{language_name}"] = lang
+    return parser, lang
+
+
+def _is_semantic_unit(node: Node, semantic_types: List[str]) -> bool:
+    return node.type in semantic_types
+
+
+def _extract_semantic_chunks(
+    node: Node,
+    semantic_types: List[str],
+    source_bytes: bytes,
+    parent_context: str = "",
+) -> List[Tuple[str, str, int, int]]:
+    chunks = []
+    node_type = node.type
+
+    if _is_semantic_unit(node, semantic_types):
+        text = source_bytes[node.start_byte : node.end_byte].decode(
+            "utf-8", errors="replace"
+        )
+        token_count = _token_counter.count(text)
+
+        if token_count > 4000:
+            children_chunks = _split_large_node(
+                node, semantic_types, source_bytes, parent_context
+            )
+            if children_chunks:
+                chunks.extend(children_chunks)
+            else:
+                chunks.append((node_type, text, node.start_byte, node.end_byte))
+        else:
+            chunks.append((node_type, text, node.start_byte, node.end_byte))
+    else:
+        for child in node.children:
+            chunks.extend(
+                _extract_semantic_chunks(
+                    child, semantic_types, source_bytes, parent_context
+                )
+            )
+
+    return chunks
+
+
+def _split_large_node(
+    node: Node,
+    semantic_types: List[str],
+    source_bytes: bytes,
+    parent_context: str,
+) -> List[Tuple[str, str, int, int]]:
+    children_with_semantic = [
+        (child, child.type in semantic_types)
+        for child in node.children
+        if child.type not in ("comment", "preproc_directive", "attribute")
+    ]
+
+    if not children_with_semantic:
+        return []
+
+    results = []
+    current_text_parts = []
+    current_start = children_with_semantic[0][0].start_byte
+
+    for child, is_semantic in children_with_semantic:
+        if is_semantic:
+            if current_text_parts:
+                combined = source_bytes[
+                    current_start : current_text_parts[0][0].start_byte
+                ].decode("utf-8", errors="replace") + "".join(
+                    source_bytes[p[0].start_byte : p[0].end_byte].decode(
+                        "utf-8", errors="replace"
+                    )
+                    for p in current_text_parts
+                )
+                if _token_counter.count(combined) >= MIN_CHUNK_CHARS // 4:
+                    results.append(
+                        (
+                            "sub_chunk",
+                            combined,
+                            current_start,
+                            current_text_parts[0][0].start_byte,
+                        )
+                    )
+                current_text_parts = []
+                current_start = child.start_byte
+
+            child_text = source_bytes[child.start_byte : child.end_byte].decode(
+                "utf-8", errors="replace"
+            )
+            if _token_counter.count(child_text) <= 4000:
+                results.append(
+                    (child.type, child_text, child.start_byte, child.end_byte)
+                )
+            else:
+                nested = _split_large_node(
+                    child, semantic_types, source_bytes, parent_context
+                )
+                results.extend(nested)
+        else:
+            current_text_parts.append((child, child.type))
+
+    if current_text_parts:
+        combined = source_bytes[
+            current_start : current_text_parts[0][0].start_byte
+        ].decode("utf-8", errors="replace") + "".join(
+            source_bytes[p[0].start_byte : p[0].end_byte].decode(
+                "utf-8", errors="replace"
+            )
+            for p in current_text_parts
+        )
+        if _token_counter.count(combined) >= MIN_CHUNK_CHARS // 4:
+            results.append(
+                (
+                    "sub_chunk",
+                    combined,
+                    current_start,
+                    current_text_parts[0][0].start_byte,
+                )
+            )
+
+    return results
+
+
+def _simple_chunk_text(content: str, chunk_size: int = 512) -> List[str]:
+    import tiktoken
+
+    enc = tiktoken.encoding_for_model("gpt-4o")
+    lines = content.split("\n")
+    chunks = []
+    current = []
+    current_tokens = 0
+
+    for line in lines:
+        line_tokens = len(enc.encode(line))
+        if current_tokens + line_tokens > chunk_size and current:
+            chunks.append("\n".join(current))
+            current = [line]
+            current_tokens = line_tokens
+        else:
+            current.append(line)
+            current_tokens += line_tokens
+
+    if current:
+        chunks.append("\n".join(current))
+    return chunks
 
 
 def chunk_code(
@@ -50,41 +481,32 @@ def chunk_code(
     chunk_size: int = 512,
     chunk_overlap: int = 50,
 ) -> List[Dict[str, Any]]:
-    """将代码文件分块，返回块列表
+    ext = Path(file_path).suffix.lower()
+    lang_name = LANGUAGE_MAP.get(ext)
 
-    使用 langchain_text_splitters 进行语言感知分块。
-    支持 29 种编程语言的语法感知分块。
-
-    Args:
-        content: 文件内容
-        file_path: 文件路径
-        chunk_size: 分块大小（token 数）
-        chunk_overlap: 重叠大小（token 数）
-
-    Returns:
-        分块列表，每个块包含 text 和 metadata
-    """
-    language = detect_language(file_path)
-
-    if language is None:
-        # 不支持的语言，使用简单分块
-        splitter = RecursiveCharacterTextSplitter(
-            chunk_size=chunk_size,
-            chunk_overlap=chunk_overlap,
-            separators=["\n\n", "\n", " ", ""],
-            length_function=len,
-        )
-        texts = splitter.split_text(content)
-        language_name = "text"
+    if not lang_name:
+        texts = _simple_chunk_text(content, chunk_size)
+        lang_display = "text"
     else:
-        # 使用语言感知分块
-        splitter = RecursiveCharacterTextSplitter.from_language(
-            language=language,
-            chunk_size=chunk_size,
-            chunk_overlap=chunk_overlap,
-        )
-        texts = splitter.split_text(content)
-        language_name = language.value
+        semantic_types = SEMANTIC_UNITS.get(lang_name, [])
+        source_bytes = content.encode("utf-8")
+
+        try:
+            parser, _ = get_parser(lang_name)
+        except Exception:
+            texts = _simple_chunk_text(content, chunk_size)
+            lang_display = lang_name
+        else:
+            tree = parser.parse(source_bytes)
+            raw_chunks = _extract_semantic_chunks(
+                tree.root_node, semantic_types, source_bytes
+            )
+
+            if not raw_chunks:
+                texts = _simple_chunk_text(content, chunk_size)
+            else:
+                texts = [text for _, text, _, _ in raw_chunks]
+            lang_display = lang_name
 
     return [
         {
@@ -92,8 +514,13 @@ def chunk_code(
             "metadata": {
                 "source_file": file_path,
                 "chunk_index": i,
-                "language": language_name,
+                "language": lang_display,
             },
         }
         for i, text in enumerate(texts)
     ]
+
+
+def detect_language(file_path: str) -> Optional[str]:
+    ext = Path(file_path).suffix.lower()
+    return LANGUAGE_MAP.get(ext)
diff --git a/src/ocrag/cli.py b/src/ocrag/cli.py
index 8c5826e..842e017 100644
--- a/src/ocrag/cli.py
+++ b/src/ocrag/cli.py
@@ -1,4 +1,5 @@
 import click
+from pathlib import Path
 from ocrag.commands import add as add_cmd
 from ocrag.commands import search as search_cmd
 from ocrag.commands import remove as remove_cmd
@@ -13,11 +14,31 @@ def main():
 
 
 @main.command()
-@click.argument("paths", nargs=-1, required=True, type=click.Path(exists=True))
+@click.argument("paths", nargs=-1, required=True)
 @click.option("--recursive", "-r", is_flag=True, help="递归处理目录")
-def add(paths, recursive):
-    """向知识库添加文件或目录"""
-    add_cmd(paths, recursive)
+@click.option(
+    "--include", "-i", multiple=True, help="只添加匹配的文件（glob 模式，可多次指定）"
+)
+@click.option(
+    "--exclude", "-e", multiple=True, help="排除匹配的文件（glob 模式，可多次指定）"
+)
+@click.option("--no-ignore", is_flag=True, help="禁用 .gitignore 过滤")
+def add(paths, recursive, include, exclude, no_ignore):
+    """向知识库添加文件或目录
+
+    默认会自动读取 .gitignore 规则并跳过匹配的文件。
+    目录遍历时自动跳过 .git、__pycache__、node_modules 等目录。
+    """
+    for p in paths:
+        if not Path(p).exists():
+            raise click.BadParameter(f"路径不存在: {p}")
+    add_cmd(
+        paths,
+        recursive,
+        include_patterns=list(include) if include else None,
+        exclude_patterns=list(exclude) if exclude else None,
+        use_gitignore=not no_ignore,
+    )
 
 
 @main.command()
@@ -29,16 +50,17 @@ def search(query, top_k):
 
 
 @main.command()
-@click.argument("path", type=click.Path())
-def remove(path):
-    """从知识库中移除指定文件"""
-    remove_cmd(path)
+@click.argument("pattern")
+def remove(pattern):
+    """从知识库中移除匹配模式的所有文件（支持通配符）"""
+    remove_cmd(pattern)
 
 
-@main.command()
-def list():
-    """列出知识库中的所有条目"""
-    list_cmd()
+@main.command("list")
+@click.argument("pattern", required=False)
+def list_files(pattern):
+    """列出知识库中的条目（可选通配符筛选）"""
+    list_cmd(pattern)
 
 
 if __name__ == "__main__":
diff --git a/src/ocrag/commands/add.py b/src/ocrag/commands/add.py
index d5d9f99..2069c18 100644
--- a/src/ocrag/commands/add.py
+++ b/src/ocrag/commands/add.py
@@ -1,56 +1,143 @@
 import os
+import pathspec
 from pathlib import Path
+from typing import List
+from tqdm import tqdm
 from ocrag.chunker import chunk_code
 from ocrag.embedder import embedder
 from ocrag.db import RagDB
+from ocrag.utils import is_text_file
+from ocrag.gitignore import get_gitignore_matcher
 
 
-def collect_files(paths, recursive):
-    """收集所有需要处理的文件"""
+def collect_files(
+    paths,
+    recursive: bool,
+    include_patterns: List[str] = None,
+    exclude_patterns: List[str] = None,
+    use_gitignore: bool = True,
+) -> List[Path]:
+    """收集所有需要处理的文件
+
+    Args:
+        paths: 文件或目录路径列表
+        recursive: 是否递归处理目录
+        include_patterns: 只处理匹配这些 glob 模式的文件
+        exclude_patterns: 跳过匹配这些 glob 模式的文件
+        use_gitignore: 是否应用 .gitignore 规则
+    """
     files = []
+    seen = set()
+
+    exclude_spec = None
+    if exclude_patterns:
+        exclude_spec = pathspec.PathSpec.from_lines("gitignore", exclude_patterns)
+
+    include_spec = None
+    if include_patterns:
+        include_spec = pathspec.PathSpec.from_lines("gitignore", include_patterns)
+
     for p in paths:
-        p = Path(p)
+        p = Path(p).resolve()
         if p.is_file():
             files.append(p)
         elif p.is_dir() and recursive:
-            for root, dirs, filenames in os.walk(p):
-                for f in filenames:
-                    files.append(Path(root) / f)
+            matcher = get_gitignore_matcher(p) if use_gitignore else None
+
+            for root_dir, dirs, filenames in os.walk(p):
+                root_dir = Path(root_dir)
+
+                dirs[:] = [
+                    d
+                    for d in dirs
+                    if d
+                    not in (
+                        ".git",
+                        "__pycache__",
+                        ".pytest_cache",
+                        ".mypy_cache",
+                        "node_modules",
+                        ".venv",
+                        "venv",
+                        ".env",
+                        ".tox",
+                        ".eggs",
+                    )
+                    and not d.endswith(".egg-info")
+                ]
+
+                for filename in filenames:
+                    file_path = root_dir / filename
+
+                    if file_path in seen:
+                        continue
+                    seen.add(file_path)
+
+                    rel = file_path.relative_to(p)
+
+                    if not is_text_file(str(file_path)):
+                        continue
+
+                    if matcher and matcher.is_ignored(file_path):
+                        continue
+
+                    if exclude_spec and exclude_spec.match_file(str(rel)):
+                        continue
+
+                    if include_spec and not include_spec.match_file(str(rel)):
+                        continue
+
+                    files.append(file_path)
         elif p.is_dir() and not recursive:
             print(f"跳过目录 {p}（未使用 --recursive）")
+
     return files
 
 
-def run(paths, recursive):
+def run(
+    paths,
+    recursive: bool,
+    include_patterns: List[str] = None,
+    exclude_patterns: List[str] = None,
+    use_gitignore: bool = True,
+):
     db = RagDB()
-    files = collect_files(paths, recursive)
+    files = collect_files(
+        paths, recursive, include_patterns, exclude_patterns, use_gitignore
+    )
+
+    if not files:
+        print("没有找到需要处理的文件")
+        return
 
     total_chunks = 0
-    for file_path in files:
-        try:
-            content = file_path.read_text(encoding="utf-8")
-            chunks = chunk_code(content, str(file_path))
-            if not chunks:
-                continue
+    with tqdm(total=len(files), desc="处理文件", unit="file") as pbar:
+        for file_path in files:
+            try:
+                content = file_path.read_text(encoding="utf-8")
+                chunks = chunk_code(content, str(file_path))
+                if not chunks:
+                    pbar.update(1)
+                    continue
 
-            # 批量 embedding
-            texts = [c["text"] for c in chunks]
-            vectors = embedder.embed(texts)
+                texts = [c["text"] for c in chunks]
+                vectors = embedder.embed(texts)
 
-            documents = []
-            for chunk, vec in zip(chunks, vectors):
-                documents.append(
-                    {
-                        "text": chunk["text"],
-                        "vector": vec,
-                        "metadata": chunk["metadata"],
-                    }
-                )
+                documents = []
+                for chunk, vec in zip(chunks, vectors):
+                    documents.append(
+                        {
+                            "text": chunk["text"],
+                            "vector": vec,
+                            "metadata": chunk["metadata"],
+                        }
+                    )
 
-            db.add_documents(documents)
-            total_chunks += len(documents)
-            print(f"✅ {file_path} -> {len(documents)} 个块")
-        except Exception as e:
-            print(f"❌ 处理 {file_path} 失败: {e}")
+                db.add_documents(documents)
+                total_chunks += len(documents)
+                pbar.set_postfix({"块": f"{total_chunks}"})
+            except Exception as e:
+                print(f"\n❌ 处理 {file_path} 失败: {e}")
+            pbar.update(1)
 
     print(f"\n📦 总计添加 {total_chunks} 个块")
diff --git a/src/ocrag/commands/list.py b/src/ocrag/commands/list.py
index dd18f29..dd0049a 100644
--- a/src/ocrag/commands/list.py
+++ b/src/ocrag/commands/list.py
@@ -1,14 +1,15 @@
 from ocrag.db import RagDB
 
 
-def run():
+def run(pattern: str = None):
     db = RagDB()
-    sources = db.list_sources()
+    sources = db.list_sources(pattern)
 
     if not sources:
         print("知识库为空")
         return
 
-    print("知识库中的文件:")
+    label = f'匹配 "{pattern}" 的' if pattern else ""
+    print(f"{label}知识库中的文件:")
     for i, source in enumerate(sources, 1):
         print(f"{i}. {source}")
diff --git a/src/ocrag/commands/remove.py b/src/ocrag/commands/remove.py
index 992179e..f1f7374 100644
--- a/src/ocrag/commands/remove.py
+++ b/src/ocrag/commands/remove.py
@@ -1,9 +1,8 @@
+import fnmatch
 from ocrag.db import RagDB
 
 
-def run(path: str):
+def run(pattern: str):
     db = RagDB()
-    # 注意：当前db.py中的delete_by_source方法尚未完全实现
-    # 这里先调用以保持接口一致，后续需要完善db.py的实现
-    db.delete_by_source(path)
-    print(f"已删除 {path} 的所有块")
+    count = db.delete_by_pattern(pattern)
+    print(f'已删除 {count} 个匹配 "{pattern}" 的块')
diff --git a/src/ocrag/db.py b/src/ocrag/db.py
index a920441..31b08d8 100644
--- a/src/ocrag/db.py
+++ b/src/ocrag/db.py
@@ -8,43 +8,51 @@ DB_PATH = Path.home() / ".ocrag" / "data.lance"
 
 class RagDB:
     def __init__(self, db_path: str = None):
-        self.path = db_path or str(DB_PATH)
+        import os as _os
+
+        self.path = db_path or _os.environ.get("OCRAG_DB_PATH", str(DB_PATH))
         self.conn = lancedb.connect(self.path)
         self._init_table()
 
     def _init_table(self):
         """如果表不存在则创建"""
-        schema = pa.schema(
-            [
-                ("text", pa.string()),
-                (
-                    "vector",
-                    pa.list_(pa.float32(), 1024),
-                ),  # 1024维 (Qwen3-Embedding-0.6B)
-                ("metadata", pa.string()),  # JSON 字符串
-            ]
-        )
         try:
             self.table = self.conn.open_table("documents")
         except:
-            self.table = self.conn.create_table("documents", schema=schema)
+            empty = pa.table(
+                {
+                    "text": pa.array([], type=pa.string()),
+                    "vector": pa.array([], type=pa.list_(pa.float32(), 1024)),
+                    "metadata": pa.array([], type=pa.string()),
+                }
+            )
+            self.table = self.conn.create_table("documents", empty)
 
     def add_documents(self, documents: List[Dict[str, Any]]):
         """批量添加文档
         documents: [{"text": str, "vector": List[float], "metadata": dict}, ...]
         """
         import json
+        import numpy as np
 
-        data = []
+        texts = []
+        vectors = []
+        metadatas = []
         for doc in documents:
-            data.append(
-                {
-                    "text": doc["text"],
-                    "vector": doc["vector"],
-                    "metadata": json.dumps(doc.get("metadata", {})),
-                }
-            )
-        self.table.add(data)
+            texts.append(doc["text"])
+            vec = doc["vector"]
+            if isinstance(vec, list):
+                vec = np.array(vec, dtype=np.float32)
+            vectors.append(vec)
+            metadatas.append(json.dumps(doc.get("metadata", {})))
+
+        arrays = [
+            pa.array(texts),
+            pa.array(vectors, type=pa.list_(pa.float32(), 1024)),
+            pa.array(metadatas),
+        ]
+        batch = pa.record_batch(arrays, names=["text", "vector", "metadata"])
+        self.table.add(batch)
 
     def search(self, query_vector: List[float], top_k: int = 5) -> List[Dict[str, Any]]:
         import json
@@ -96,9 +104,50 @@ class RagDB:
 
         return num_deleted
 
-    def list_sources(self) -> List[str]:
-        """列出所有已添加的源文件路径（去重）"""
-        # 获取所有 metadata，提取 source_file
+    def delete_by_pattern(self, pattern: str) -> int:
+        """删除匹配通配符模式的所有源文件的所有块
+
+        Args:
+            pattern: fnmatch 模式，如 "*.py", "src/**/*.js", "**/test_*.py"
+
+        Returns:
+            删除的块数量
+        """
+        import fnmatch
+        import json
+
+        df = self.table.to_pandas()
+        if df.empty:
+            return 0
+
+        indices_to_keep = []
+        for idx, row in df.iterrows():
+            try:
+                meta = json.loads(row["metadata"])
+                source = meta.get("source_file", "")
+                if not fnmatch.fnmatch(source, pattern):
+                    indices_to_keep.append(idx)
+            except (json.JSONDecodeError, KeyError):
+                indices_to_keep.append(idx)
+
+        num_deleted = len(df) - len(indices_to_keep)
+        if num_deleted == 0:
+            return 0
+
+        df_remaining = df.loc[indices_to_keep]
+        self.conn.drop_table("documents")
+        self.table = self.conn.create_table("documents", df_remaining)
+
+        return num_deleted
+
+    def list_sources(self, pattern: str = None) -> List[str]:
+        """列出所有已添加的源文件路径（去重）
+
+        Args:
+            pattern: 可选的 fnmatch 模式，筛选匹配的文件
+        """
+        import fnmatch
+
         df = self.table.to_pandas()
         if df.empty:
             return []
@@ -108,5 +157,6 @@ class RagDB:
         for meta_str in df["metadata"]:
             meta = json.loads(meta_str)
             if "source_file" in meta:
-                sources.add(meta["source_file"])
+                if pattern is None or fnmatch.fnmatch(meta["source_file"], pattern):
+                    sources.add(meta["source_file"])
         return sorted(sources)
diff --git a/src/ocrag/gitignore.py b/src/ocrag/gitignore.py
new file mode 100644
index 0000000..ff49a13
--- /dev/null
+++ b/src/ocrag/gitignore.py
@@ -0,0 +1,73 @@
+import os
+import fnmatch
+import pathspec
+from pathlib import Path
+from typing import List, Tuple, Set, Optional
+
+
+class GitignoreMatcher:
+    """多层 .gitignore 解析器
+
+    支持从项目根目录向下遍历，收集所有 .gitignore 文件，
+    每个 .gitignore 中的规则只对该文件所在目录及其子目录生效。
+    """
+
+    def __init__(self, root: Path):
+        self.root = root.resolve()
+        self._specs: List[Tuple[Path, pathspec.PathSpec]] = []
+        self._load()
+
+    def _load(self):
+        """遍历目录树，收集所有 .gitignore 并构建 pathspec"""
+        for dirpath, dirnames, filenames in os.walk(self.root):
+            dirpath = Path(dirpath)
+            gi_path = dirpath / ".gitignore"
+            if gi_path.exists() and gi_path.is_file():
+                try:
+                    lines = gi_path.read_text(
+                        encoding="utf-8", errors="ignore"
+                    ).splitlines()
+                    spec = pathspec.PathSpec.from_lines("gitignore", lines)
+                    self._specs.append((dirpath, spec))
+                except Exception:
+                    pass
+
+            dirnames[:] = [d for d in dirnames if d not in (".git", "__pycache__")]
+
+    def is_ignored(self, file_path: Path) -> bool:
+        """判断文件是否被任一层 .gitignore 忽略"""
+        abs_path = file_path.resolve()
+
+        for dirpath, spec in self._specs:
+            try:
+                rel = abs_path.relative_to(dirpath)
+            except ValueError:
+                continue
+
+            if spec.match_file(str(rel)):
+                return True
+
+        return False
+
+
+def find_project_root(start_path: Path) -> Optional[Path]:
+    """从 start_path 向上查找包含 .gitignore 的目录作为项目根"""
+    current = start_path.resolve()
+    if start_path.is_file():
+        current = current.parent
+
+    while True:
+        if (current / ".gitignore").exists():
+            return current
+        parent = current.parent
+        if parent == current:
+            return None
+        current = parent
+
+
+def get_gitignore_matcher(root: Path) -> Optional[GitignoreMatcher]:
+    """为给定目录创建 GitignoreMatcher"""
+    gi_path = find_project_root(root)
+    if gi_path is None:
+        return None
+    return GitignoreMatcher(gi_path)
diff --git a/src/ocrag/utils.py b/src/ocrag/utils.py
index 41f0df8..77e103d 100644
--- a/src/ocrag/utils.py
+++ b/src/ocrag/utils.py
@@ -33,44 +33,23 @@ def format_size(size_bytes: int) -> str:
 
 
 def is_text_file(file_path: str) -> bool:
-    """检查文件是否为文本文件"""
-    text_extensions = {
-        ".py",
-        ".js",
-        ".ts",
-        ".jsx",
-        ".tsx",
-        ".java",
-        ".c",
-        ".cpp",
-        ".h",
-        ".hpp",
-        ".go",
-        ".rs",
-        ".rb",
-        ".php",
-        ".swift",
-        ".kt",
-        ".scala",
-        ".md",
-        ".txt",
-        ".json",
-        ".yaml",
-        ".yml",
-        ".xml",
-        ".html",
-        ".css",
-        ".sql",
-        ".sh",
-        ".bash",
-        ".zsh",
-        ".ps1",
-        ".bat",
-        ".vue",
-        ".svelte",
-    }
-    ext = Path(file_path).suffix.lower()
-    return ext in text_extensions
+    """检查文件是否为文本文件
+
+    通过读取文件前 1KB 内容检测：
+    - 包含 null byte (\\x00) 则判定为二进制
+    - 能够以 UTF-8 解码则判定为文本
+    """
+    try:
+        with open(file_path, "rb") as f:
+            chunk = f.read(1024)
+        if not chunk:
+            return True
+        if b"\x00" in chunk:
+            return False
+        chunk.decode("utf-8")
+        return True
+    except (UnicodeDecodeError, OSError):
+        return False
 
 
 def get_project_root() -> Path:
diff --git a/tests/unit/test_commands.py b/tests/unit/test_commands.py
index 5eef252..fe986a7 100644
--- a/tests/unit/test_commands.py
+++ b/tests/unit/test_commands.py
@@ -3,6 +3,7 @@ import os
 from click.testing import CliRunner
 from ocrag.cli import main
 from ocrag.db import RagDB
+from ocrag.commands.add import collect_files
 
 
 @pytest.fixture
@@ -12,17 +13,15 @@ def runner():
 
 @pytest.fixture
 def setup_test_env(tmpdir):
-    # Create test files
     os.makedirs(os.path.join(tmpdir, "test_dir"))
     with open(os.path.join(tmpdir, "test_dir", "file1.py"), "w") as f:
         f.write("def test_func():\n    pass")
     with open(os.path.join(tmpdir, "test_file.py"), "w") as f:
         f.write("print('Hello')")
-    return tmpdir
+    return str(tmpdir)
 
 
 def test_add_command(runner, setup_test_env, tmpdir):
-    # Use temporary DB
     db_path = os.path.join(tmpdir, "test_db.lance")
     os.environ["OCRAG_DB_PATH"] = db_path
 
@@ -33,7 +32,6 @@ def test_add_command(runner, setup_test_env, tmpdir):
 
 
 def test_search_command(runner, setup_test_env, tmpdir):
-    # Use temporary DB and add a file first
     db_path = os.path.join(tmpdir, "test_db.lance")
     os.environ["OCRAG_DB_PATH"] = db_path
 
@@ -42,14 +40,12 @@ def test_search_command(runner, setup_test_env, tmpdir):
     )
     assert add_result.exit_code == 0
 
-    # Search
     result = runner.invoke(main, ["search", "Hello"])
     assert "Hello" in result.output
     assert "来源: " in result.output
 
 
 def test_list_command(runner, setup_test_env, tmpdir):
-    # Use temporary DB and add a file first
     db_path = os.path.join(tmpdir, "test_db.lance")
     os.environ["OCRAG_DB_PATH"] = db_path
 
@@ -58,6 +54,104 @@ def test_list_command(runner, setup_test_env, tmpdir):
     )
     assert add_result.exit_code == 0
 
-    # List
     result = runner.invoke(main, ["list"])
     assert "test_file.py" in result.output
+
+
+def test_remove_wildcard(runner, setup_test_env, tmpdir):
+    db_path = os.path.join(tmpdir, "test_db.lance")
+    os.environ["OCRAG_DB_PATH"] = db_path
+
+    runner.invoke(main, ["add", os.path.join(setup_test_env, "test_file.py")])
+    runner.invoke(main, ["add", os.path.join(setup_test_env, "test_dir", "file1.py")])
+
+    result = runner.invoke(main, ["remove", "*.py"])
+    assert result.exit_code == 0
+    assert "已删除" in result.output
+
+    list_result = runner.invoke(main, ["list"])
+    assert "test_file.py" not in list_result.output
+
+
+def test_list_wildcard(runner, setup_test_env, tmpdir):
+    db_path = os.path.join(tmpdir, "test_db.lance")
+    os.environ["OCRAG_DB_PATH"] = db_path
+
+    runner.invoke(main, ["add", os.path.join(setup_test_env, "test_file.py")])
+    runner.invoke(main, ["add", os.path.join(setup_test_env, "test_dir", "file1.py")])
+
+    result = runner.invoke(main, ["list", "*.py"])
+    assert result.exit_code == 0
+    assert "test_file.py" in result.output
+    assert "file1.py" in result.output
+
+
+class TestCollectFiles:
+    def test_exclude_pattern(self, setup_test_env):
+        files = collect_files(
+            [setup_test_env], recursive=True, exclude_patterns=["**/test_*.py"]
+        )
+        names = [f.name for f in files]
+        assert "test_file.py" not in names
+        assert "file1.py" in names
+
+    def test_include_pattern(self, setup_test_env):
+        files = collect_files(
+            [setup_test_env], recursive=True, include_patterns=["*.py"]
+        )
+        names = [f.name for f in files]
+        assert "test_file.py" in names
+        assert "file1.py" in names
+
+    def test_binary_skip(self, tmpdir):
+        with open(os.path.join(tmpdir, "binary.bin"), "wb") as f:
+            f.write(b"\x00\x01\x02binary")
+        with open(os.path.join(tmpdir, "text.py"), "w") as f:
+            f.write("print('hello')")
+
+        files = collect_files([str(tmpdir)], recursive=True)
+        names = [f.name for f in files]
+        assert "binary.bin" not in names
+        assert "text.py" in names
+
+    def test_gitignore(self, tmpdir):
+        os.makedirs(os.path.join(tmpdir, "src"))
+        with open(os.path.join(tmpdir, "src", "main.py"), "w") as f:
+            f.write("print('hello')")
+        with open(os.path.join(tmpdir, "src", "test_main.py"), "w") as f:
+            f.write("def test(): pass")
+        with open(os.path.join(tmpdir, ".gitignore"), "w") as f:
+            f.write("**/test_*.py\n")
+
+        files = collect_files([os.path.join(tmpdir, "src")], recursive=True)
+        names = [f.name for f in files]
+        assert "main.py" in names
+        assert "test_main.py" not in names
+
+    def test_no_ignore_disables_gitignore(self, setup_test_env):
+        with open(os.path.join(setup_test_env, ".gitignore"), "w") as f:
+            f.write("test_file.py\n")
+
+        files = collect_files([setup_test_env], recursive=True, use_gitignore=False)
+        names = [f.name for f in files]
+        assert "test_file.py" in names
+
+    def test_combined_filters(self, tmpdir):
+        os.makedirs(os.path.join(tmpdir, "lib"))
+        with open(os.path.join(tmpdir, "lib", "main.py"), "w") as f:
+            f.write("def main(): pass")
+        with open(os.path.join(tmpdir, "lib", "test_main.py"), "w") as f:
+            f.write("def test(): pass")
+        with open(os.path.join(tmpdir, "lib", "data.bin"), "wb") as f:
+            f.write(b"\x00binary")
+
+        files = collect_files(
+            [os.path.join(tmpdir, "lib")],
+            recursive=True,
+            include_patterns=["*.py"],
+            exclude_patterns=["**/test_*.py"],
+        )
+        names = [f.name for f in files]
+        assert "main.py" in names
+        assert "test_main.py" not in names
+        assert "data.bin" not in names
diff --git a/tests/unit/test_utils.py b/tests/unit/test_utils.py
new file mode 100644
index 0000000..9944432
--- /dev/null
+++ b/tests/unit/test_utils.py
@@ -0,0 +1,126 @@
+import os
+import pytest
+from pathlib import Path
+from ocrag.gitignore import GitignoreMatcher, get_gitignore_matcher, find_project_root
+from ocrag.utils import is_text_file
+
+
+class TestIsTextFile:
+    def test_python_file_is_text(self, tmp_path):
+        f = tmp_path / "test.py"
+        f.write_text("def foo():\n    pass")
+        assert is_text_file(str(f)) is True
+
+    def test_binary_file_is_not_text(self, tmp_path):
+        f = tmp_path / "test.bin"
+        f.write_bytes(b"\x00\x01\x02\x03binary")
+        assert is_text_file(str(f)) is False
+
+    def test_empty_file_is_text(self, tmp_path):
+        f = tmp_path / "empty.txt"
+        f.write_text("")
+        assert is_text_file(str(f)) is True
+
+    def test_utf8_with_non_ascii_is_text(self, tmp_path):
+        f = tmp_path / "unicode.txt"
+        f.write_text("中文内容测试\n日本語\n한국어")
+        assert is_text_file(str(f)) is True
+
+    def test_invalid_utf8_is_not_text(self, tmp_path):
+        f = tmp_path / "invalid.txt"
+        f.write_bytes(b"hello\x80world")
+        assert is_text_file(str(f)) is False
+
+
+class TestFindProjectRoot:
+    def test_finds_gitignore(self, tmp_path):
+        (tmp_path / ".gitignore").write_text("*.pyc")
+        sub = tmp_path / "src" / "deep"
+        sub.mkdir(parents=True)
+        found = find_project_root(sub)
+        assert found == tmp_path
+
+    def test_no_gitignore_returns_none(self, tmp_path):
+        sub = tmp_path / "src"
+        sub.mkdir(parents=True)
+        found = find_project_root(sub)
+        assert found is None
+
+
+class TestGitignoreMatcher:
+    def test_ignore_pattern(self, tmp_path):
+        (tmp_path / ".gitignore").write_text("*.pyc\n__pycache__/\n")
+        matcher = GitignoreMatcher(tmp_path)
+
+        assert matcher.is_ignored(tmp_path / "file.pyc") is True
+        assert matcher.is_ignored(tmp_path / "file.py") is False
+        assert matcher.is_ignored(tmp_path / "__pycache__" / "cache.pyc") is True
+
+    def test_negation_pattern(self, tmp_path):
+        (tmp_path / ".gitignore").write_text("*.log\n!important.log\n")
+        matcher = GitignoreMatcher(tmp_path)
+
+        assert matcher.is_ignored(tmp_path / "debug.log") is True
+        assert matcher.is_ignored(tmp_path / "important.log") is False
+
+    def test_subdirectory_gitignore(self, tmp_path):
+        (tmp_path / ".gitignore").write_text("*.py\n")
+        sub_dir = tmp_path / "src"
+        sub_dir.mkdir()
+        (sub_dir / ".gitignore").write_text("test_*.py\n")
+        matcher = GitignoreMatcher(tmp_path)
+
+        assert matcher.is_ignored(tmp_path / "main.py") is True
+        assert matcher.is_ignored(tmp_path / "utils.py") is True
+        assert matcher.is_ignored(sub_dir / "helper.py") is True
+        assert matcher.is_ignored(sub_dir / "test_main.py") is True
+
+    def test_anchored_pattern(self, tmp_path):
+        (tmp_path / ".gitignore").write_text("/build\n")
+        matcher = GitignoreMatcher(tmp_path)
+
+        assert matcher.is_ignored(tmp_path / "build" / "output") is True
+        assert matcher.is_ignored(tmp_path / "src" / "build" / "out") is False
+
+    def test_ignore_directory_ending_slash(self, tmp_path):
+        (tmp_path / ".gitignore").write_text("node_modules/\n")
+        matcher = GitignoreMatcher(tmp_path)
+
+        assert matcher.is_ignored(tmp_path / "node_modules" / "package.json") is True
+        assert matcher.is_ignored(tmp_path / "other" / "node_modules" / "file") is True
+
+    def test_get_matcher_returns_none_when_no_gitignore(self, tmp_path):
+        result = get_gitignore_matcher(tmp_path / "nonexistent")
+        assert result is None
+
+    def test_get_matcher_returns_matcher(self, tmp_path):
+        (tmp_path / ".gitignore").write_text("*.pyc")
+        result = get_gitignore_matcher(tmp_path)
+        assert result is not None
+        assert result.is_ignored(tmp_path / "file.pyc") is True
+
+    def test_comments_ignored(self, tmp_path):
+        (tmp_path / ".gitignore").write_text(
+            "# this is a comment\n*.log\n  # another comment\n"
+        )
+        matcher = GitignoreMatcher(tmp_path)
+        assert matcher.is_ignored(tmp_path / "debug.log") is True
+
+    def test_whitespace_lines(self, tmp_path):
+        (tmp_path / ".gitignore").write_text("  *.log\n")
+        matcher = GitignoreMatcher(tmp_path)
+        assert matcher.is_ignored(tmp_path / "  debug.log") is True
+        assert matcher.is_ignored(tmp_path / "debug.log") is False
+
+    def test_double_star_pattern(self, tmp_path):
+        (tmp_path / ".gitignore").write_text("**/*.pyc\n")
+        matcher = GitignoreMatcher(tmp_path)
+
+        assert matcher.is_ignored(tmp_path / "a.pyc") is True
+        assert matcher.is_ignored(tmp_path / "src" / "a.pyc") is True
+        assert matcher.is_ignored(tmp_path / "src" / "deep" / "a.pyc") is True
+
+    def test_no_gitignore_file(self, tmp_path):
+        matcher = GitignoreMatcher(tmp_path)
+        assert matcher.is_ignored(tmp_path / "file.py") is False
+        assert matcher.is_ignored(tmp_path / "anything") is False