feat: command snippets + UI test coverage for new features

- core/snippets.py: SnippetManager with 20 prebuilt sysadmin commands,
  CRUD + reorder, persisted to ~/.sshclient/snippets.json
- ui/snippet_dialog.py: SnippetDialog (add/edit) + SnippetManagerDialog
  (table view with add/edit/delete/move up/down)
- ui/terminal_panel.py: snippet combo box in toolbar, send_command()
  method to inject commands into interactive shell, snippet manager button
- README.md: updated feature table, usage section, project structure
- test_ui.py: added [2/4] checks for sparkline/snippets/theme,
  added [4/4] theme toggle verification

README.md

@@ -9,10 +9,14 @@
 | 模块 | 说明 |
 | --- | --- |
 | 多主机管理 | 增删改查、密码/私钥双认证、配置导入导出、配置持久化到 `~/.sshclient/` |
-| 远程终端 | 命令执行 + 输出捕获 + 退出码 + 超时控制 + 常用命令快捷栏 |
+| 远程终端 | 真实交互式 shell（Xshell 风格）、ANSI 颜色、本地历史、Ctrl+A/E/U/K/W 快捷键 |
+| 命令片段 | 20+ 预置常用命令（ss/df/ps/docker/systemctl…），一键发送到终端，自定义增删改 |
 | SFTP 文件浏览 | 目录树浏览、上传/下载（带进度条）、新建目录、删除、重命名、双击进入 |
-| 实时监控 | CPU/内存/负载/启动时间/磁盘/网络速率，1-10 秒可调刷新间隔 |
-| AI Agent | OpenAI 兼容 API（OpenAI / DeepSeek / Moonshot / 通义千问 / Ollama 等），5 个工具自动调用：执行命令、查指标、列文件、读文件、上传 |
+| 实时监控 | CPU/内存/负载/启动时间/磁盘/网络速率/进程列表，1-10 秒可调刷新间隔 |
+| 趋势迷你图 | CPU 和内存使用率实时折线图，最近 60 个采样点，一目了然 |
+| 进程管理 | 进程表（500 条）、搜索过滤、CPU/内存排序、树形视图、右键杀进程、批量操作 |
+| AI Agent | OpenAI 兼容 API（OpenAI / DeepSeek / Moonshot / 通义千问 / Ollama 等），5 个工具自动调用 |
+| 暗色主题 | 视图菜单一键切换暗/亮主题，偏好自动持久化 |
 | 跨平台 | 代码兼容 Windows / macOS / Linux（PyQt5 + paramiko） |
 
 ## 📦 在 Windows 上构建 exe
@@ -58,13 +62,15 @@ python test_e2e.py    # 端到端测试（需本机或可访问的 sshd）
 选中主机 → **🔌 连接**。状态指示器变绿后即可使用。
 
 ### 3. 终端
-**⌨ 终端** Tab 直接输入命令回车执行。常用命令（pwd / df / free / top / netstat）有快捷按钮。
+**⌨ 终端** Tab 直接输入命令回车执行。支持 ANSI 颜色、↑↓ 历史回放、Ctrl+A/E/U/K/W 行编辑快捷键。
+
+**命令片段**：工具栏下拉框选择预置命令（ss/df/ps/docker/systemctl 等），一键发送到终端。点击 ⚙ 管理自定义片段。
 
 ### 4. 文件浏览
 **📁 文件** Tab 双击目录进入，双击文件直接下载。可拖入 / 上传任意文件。
 
 ### 5. 监控
-**📊 监控** Tab 点击 **开始监控**，指标会按设定间隔刷新。CPU/内存用大字突出，磁盘用进度条，网络显示当前速率。
+**📊 监控** Tab 点击 **开始监控**，指标会按设定间隔刷新。CPU/内存用大字突出，下方有实时趋势折线图，磁盘用进度条，网络显示当前速率。下半区是进程管理表，支持搜索过滤、CPU/内存排序、树形视图、右键杀进程。
 
 ### 6. AI Agent
 1. 先点 **⚙ AI 设置**，选择预设（OpenAI/DeepSeek/Kimi/通义千问/Ollama）或自定义填 API Key
@@ -101,12 +107,16 @@ sshclient/
 │   ├── ssh_client.py      # SSH 连接 + SFTP
 │   ├── monitor.py         # 远程系统监控
 │   ├── ai_agent.py        # AI Agent (OpenAI 兼容)
-│   └── manager.py         # 多主机管理 + 配置持久化
+│   ├── manager.py         # 多主机管理 + 配置持久化
+│   └── snippets.py        # 命令片段管理 + 持久化
 ├── ui/                    # PyQt5 界面
 │   ├── main_window.py     # 主窗口
-│   ├── widgets.py         # FileBrowser / MonitorPanel / AIChatPanel
+│   ├── widgets.py         # FileBrowser / MonitorPanel / SparklineChart / AIChatPanel
+│   ├── terminal_panel.py  # 交互式终端面板
 │   ├── host_dialog.py     # 主机编辑对话框
 │   ├── config_dialog.py   # AI 设置对话框
+│   ├── snippet_dialog.py  # 命令片段管理对话框
+│   ├── theme.py           # 亮色/暗色主题 QSS
 │   └── workers.py         # 后台线程
 └── test_*.py              # 测试脚本
 ```

core/snippets.py

@@ -0,0 +1,86 @@
+"""
+命令片段管理：保存常用命令，快速发送到终端。
+持久化到 ~/.sshclient/snippets.json
+"""
+import json
+from pathlib import Path
+from typing import List, Optional
+
+CONFIG_DIR = Path.home() / ".sshclient"
+SNIPPETS_FILE = CONFIG_DIR / "snippets.json"
+
+# 预置片段（首次运行时自动添加）
+DEFAULT_SNIPPETS = [
+    {"name": "系统信息", "cmd": "uname -a && cat /etc/os-release"},
+    {"name": "磁盘使用", "cmd": "df -h"},
+    {"name": "内存使用", "cmd": "free -h"},
+    {"name": "CPU 信息", "cmd": "lscpu | head -20"},
+    {"name": "监听端口", "cmd": "ss -tlnp"},
+    {"name": "所有连接", "cmd": "ss -tnp"},
+    {"name": "进程 TOP10", "cmd": "ps aux --sort=-%cpu | head -11"},
+    {"name": "内存 TOP10", "cmd": "ps aux --sort=-%mem | head -11"},
+    {"name": "最近登录", "cmd": "last -10"},
+    {"name": "系统日志", "cmd": "journalctl -n 50 --no-pager"},
+    {"name": "DNS 解析", "cmd": "dig +short"},
+    {"name": "网络路由", "cmd": "ip route show"},
+    {"name": "网卡信息", "cmd": "ip addr show"},
+    {"name": "防火墙状态", "cmd": "iptables -L -n --line-numbers"},
+    {"name": "Docker 容器", "cmd": "docker ps -a"},
+    {"name": "Docker 日志", "cmd": "docker logs --tail 50"},
+    {"name": "systemctl 状态", "cmd": "systemctl status"},
+    {"name": "重启服务", "cmd": "systemctl restart"},
+    {"name": "定时任务", "cmd": "crontab -l"},
+    {"name": "大文件 TOP10", "cmd": "find / -type f -size +100M 2>/dev/null | head -10"},
+]
+
+
+class SnippetManager:
+    """命令片段的增删改查 + 持久化"""
+
+    def __init__(self):
+        CONFIG_DIR.mkdir(parents=True, exist_ok=True)
+        self._snippets: List[dict] = []
+        self._load()
+
+    def _load(self):
+        if SNIPPETS_FILE.exists():
+            try:
+                with open(SNIPPETS_FILE, "r", encoding="utf-8") as f:
+                    self._snippets = json.load(f)
+            except Exception:
+                self._snippets = []
+        if not self._snippets:
+            self._snippets = [dict(s) for s in DEFAULT_SNIPPETS]
+            self._save()
+
+    def _save(self):
+        with open(SNIPPETS_FILE, "w", encoding="utf-8") as f:
+            json.dump(self._snippets, f, ensure_ascii=False, indent=2)
+
+    def list_all(self) -> List[dict]:
+        return list(self._snippets)
+
+    def add(self, name: str, cmd: str) -> int:
+        """添加片段，返回新索引"""
+        snippet = {"name": name.strip(), "cmd": cmd}
+        self._snippets.append(snippet)
+        self._save()
+        return len(self._snippets) - 1
+
+    def update(self, index: int, name: str, cmd: str):
+        if 0 <= index < len(self._snippets):
+            self._snippets[index] = {"name": name.strip(), "cmd": cmd}
+            self._save()
+
+    def remove(self, index: int):
+        if 0 <= index < len(self._snippets):
+            del self._snippets[index]
+            self._save()
+
+    def move(self, index: int, direction: int):
+        """direction: -1=上移, +1=下移"""
+        new_idx = index + direction
+        if 0 <= new_idx < len(self._snippets):
+            self._snippets[index], self._snippets[new_idx] = \
+                self._snippets[new_idx], self._snippets[index]
+            self._save()

test_ui.py

@@ -33,13 +33,21 @@ def main():
     assert w.tabs.count() == 4, f"应有 4 个 Tab，实际 {w.tabs.count()}"
     print(f"  ✓ 主窗口创建，Tab 数量 = {w.tabs.count()}")
 
-    print("[2/3] 验证子组件")
+    print("[2/4] 验证子组件")
     assert isinstance(w.file_browser, FileBrowser)
     assert isinstance(w.monitor, MonitorPanel)
     assert isinstance(w.ai_panel, AIChatPanel)
+    # 验证新增功能
+    assert hasattr(w.monitor, "_spark_cpu"), "MonitorPanel 应有 CPU 迷你图"
+    assert hasattr(w.monitor, "_spark_mem"), "MonitorPanel 应有内存迷你图"
+    assert hasattr(w.terminal_panel, "snippet_combo"), "TerminalPanel 应有片段下拉框"
+    assert hasattr(w, "act_dark"), "MainWindow 应有暗色主题菜单项"
+    menus = [a.text() for a in w.menuBar().actions()]
+    assert "视图(&V)" in menus, f"应有视图菜单: {menus}"
     print(f"  ✓ FileBrowser / MonitorPanel / AIChatPanel 全部就位")
+    print(f"  ✓ 暗色主题切换 / CPU·内存迷你图 / 命令片段下拉框")
 
-    print("[3/3] 验证对话框")
+    print("[3/4] 验证对话框")
     # 主机对话框
     hd = HostDialog(current={"name": "test", "host": "1.2.3.4", "port": 22,
                               "username": "u", "password": "p", "key_path": ""})
@@ -56,10 +64,23 @@ def main():
     cd.close()
     print(f"  ✓ AIConfigDialog + {len(PRESETS)} 个预设")
 
-    # 不真正 show，只确保不崩
+    print("[4/4] 验证主题切换")
+    from ui.theme import get_theme, set_theme, get_qss
+    # 切换到暗色
+    w.act_dark.setChecked(True)
+    w._toggle_theme()
+    assert get_theme() == "dark"
+    qss = app.styleSheet()
+    assert len(qss) > 100, "QSS 应该有内容"
+    # 切回亮色
+    w.act_dark.setChecked(False)
+    w._toggle_theme()
+    assert get_theme() == "light"
+    print(f"  ✓ 暗/亮主题切换正常 (dark QSS={len(get_qss('dark'))} chars)")
+
+    # 清理
     w.close()
     print("\n所有 UI 组件加载正常 ✓")
-    # 不进入事件循环，强制退出
     QTimer.singleShot(0, app.quit)
     app.exec_()
 

ui/snippet_dialog.py

@@ -0,0 +1,151 @@
+"""
+命令片段管理对话框
+"""
+from PyQt5.QtCore import Qt
+from PyQt5.QtWidgets import (
+    QDialog, QVBoxLayout, QHBoxLayout, QTableWidget, QTableWidgetItem,
+    QPushButton, QLabel, QLineEdit, QTextEdit, QMessageBox, QHeaderView,
+    QAbstractItemView, QSplitter, QWidget, QFormLayout,
+)
+
+from core.snippets import SnippetManager
+
+
+class SnippetDialog(QDialog):
+    """单个片段的编辑/新增对话框"""
+
+    def __init__(self, parent=None, name: str = "", cmd: str = ""):
+        super().__init__(parent)
+        self.setWindowTitle("编辑片段" if name else "新增片段")
+        self.setMinimumWidth(460)
+        v = QVBoxLayout(self)
+        form = QFormLayout()
+        self.name_edit = QLineEdit(name)
+        self.name_edit.setPlaceholderText("如：查看端口占用")
+        form.addRow("名称:", self.name_edit)
+        self.cmd_edit = QTextEdit(cmd)
+        self.cmd_edit.setPlaceholderText("如：ss -tlnp | grep :80")
+        self.cmd_edit.setMaximumHeight(80)
+        form.addRow("命令:", self.cmd_edit)
+        v.addLayout(form)
+        btns = QHBoxLayout()
+        btns.addStretch(1)
+        ok = QPushButton("保存")
+        ok.clicked.connect(self._on_ok)
+        cancel = QPushButton("取消")
+        cancel.clicked.connect(self.reject)
+        btns.addWidget(ok)
+        btns.addWidget(cancel)
+        v.addLayout(btns)
+
+    def _on_ok(self):
+        if not self.name_edit.text().strip():
+            QMessageBox.warning(self, "提示", "请输入名称")
+            return
+        if not self.cmd_edit.toPlainText().strip():
+            QMessageBox.warning(self, "提示", "请输入命令")
+            return
+        self.accept()
+
+    def get_value(self) -> dict:
+        return {
+            "name": self.name_edit.text().strip(),
+            "cmd": self.cmd_edit.toPlainText().strip(),
+        }
+
+
+class SnippetManagerDialog(QDialog):
+    """片段管理主对话框：表格 + 增删改 + 上下移"""
+
+    def __init__(self, mgr: SnippetManager, parent=None):
+        super().__init__(parent)
+        self.mgr = mgr
+        self.setWindowTitle("命令片段管理")
+        self.setMinimumSize(520, 420)
+        self._build_ui()
+        self._refresh_table()
+
+    def _build_ui(self):
+        v = QVBoxLayout(self)
+        # 工具栏
+        toolbar = QHBoxLayout()
+        toolbar.addWidget(QLabel("📋 命令片段列表"))
+        toolbar.addStretch(1)
+        self.btn_add = QPushButton("➕ 新增")
+        self.btn_add.clicked.connect(self._add)
+        self.btn_edit = QPushButton("✏ 编辑")
+        self.btn_edit.clicked.connect(self._edit)
+        self.btn_del = QPushButton("🗑 删除")
+        self.btn_del.clicked.connect(self._delete)
+        self.btn_up = QPushButton("⬆ 上移")
+        self.btn_up.clicked.connect(lambda: self._move(-1))
+        self.btn_down = QPushButton("⬇ 下移")
+        self.btn_down.clicked.connect(lambda: self._move(1))
+        for b in (self.btn_add, self.btn_edit, self.btn_del, self.btn_up, self.btn_down):
+            toolbar.addWidget(b)
+        v.addLayout(toolbar)
+        # 表格
+        self.table = QTableWidget(0, 2)
+        self.table.setHorizontalHeaderLabels(["名称", "命令"])
+        self.table.horizontalHeader().setSectionResizeMode(0, QHeaderView.ResizeToContents)
+        self.table.horizontalHeader().setSectionResizeMode(1, QHeaderView.Stretch)
+        self.table.setSelectionBehavior(QAbstractItemView.SelectRows)
+        self.table.setEditTriggers(QAbstractItemView.NoEditTriggers)
+        self.table.doubleClicked.connect(self._edit)
+        v.addWidget(self.table)
+        # 关闭按钮
+        btns = QHBoxLayout()
+        btns.addStretch(1)
+        close = QPushButton("关闭")
+        close.clicked.connect(self.accept)
+        btns.addWidget(close)
+        v.addLayout(btns)
+
+    def _refresh_table(self):
+        snippets = self.mgr.list_all()
+        self.table.setRowCount(len(snippets))
+        for i, s in enumerate(snippets):
+            self.table.setItem(i, 0, QTableWidgetItem(s["name"]))
+            cmd_display = s["cmd"][:60] + ("..." if len(s["cmd"]) > 60 else "")
+            self.table.setItem(i, 1, QTableWidgetItem(cmd_display))
+            self.table.item(i, 0).setToolTip(s["cmd"])
+
+    def _add(self):
+        dlg = SnippetDialog(self)
+        if dlg.exec_() == dlg.Accepted:
+            v = dlg.get_value()
+            self.mgr.add(v["name"], v["cmd"])
+            self._refresh_table()
+
+    def _edit(self):
+        row = self.table.currentRow()
+        if row < 0:
+            return
+        s = self.mgr.list_all()[row]
+        dlg = SnippetDialog(self, s["name"], s["cmd"])
+        if dlg.exec_() == dlg.Accepted:
+            v = dlg.get_value()
+            self.mgr.update(row, v["name"], v["cmd"])
+            self._refresh_table()
+
+    def _delete(self):
+        row = self.table.currentRow()
+        if row < 0:
+            return
+        s = self.mgr.list_all()[row]
+        if QMessageBox.question(
+            self, "确认删除", f"删除片段「{s['name']}」？",
+            QMessageBox.Yes | QMessageBox.No
+        ) == QMessageBox.Yes:
+            self.mgr.remove(row)
+            self._refresh_table()
+
+    def _move(self, direction):
+        row = self.table.currentRow()
+        if row < 0:
+            return
+        self.mgr.move(row, direction)
+        new_row = row + direction
+        self._refresh_table()
+        if 0 <= new_row < self.table.rowCount():
+            self.table.selectRow(new_row)

ui/terminal_panel.py

@@ -21,6 +21,7 @@ from PyQt5.QtWidgets import (
 )
 
 from core.ssh_client import SSHConnection
+from core.snippets import SnippetManager
 
 
 # ANSI 颜色映射（16 色）
@@ -133,6 +134,8 @@ class TerminalPanel(QWidget):
         self._ansi_invert = False
         # OSC 0/2 设置的窗口标题
         self._window_title = ""
+        # 命令片段
+        self.snippet_mgr = SnippetManager()
 
         self._build_ui()
         self._apply_style()
@@ -152,6 +155,20 @@ class TerminalPanel(QWidget):
         self.status_label.setStyleSheet("color: #888;")
         toolbar.addWidget(self.status_label)
         toolbar.addStretch(1)
+        # 命令片段
+        toolbar.addWidget(QLabel("📋"))
+        self.snippet_combo = QComboBox()
+        self.snippet_combo.setMinimumWidth(180)
+        self.snippet_combo.setToolTip("选择命令片段快速发送到终端")
+        self.snippet_combo.currentIndexChanged.connect(self._on_snippet_selected)
+        toolbar.addWidget(self.snippet_combo)
+        self._refresh_snippets()
+        self.btn_snippet_mgr = QPushButton("⚙")
+        self.btn_snippet_mgr.setFixedWidth(28)
+        self.btn_snippet_mgr.setToolTip("管理命令片段")
+        self.btn_snippet_mgr.clicked.connect(self._open_snippet_manager)
+        toolbar.addWidget(self.btn_snippet_mgr)
+        toolbar.addSpacing(8)
         self.btn_clear = QPushButton("清屏")
         self.btn_clear.clicked.connect(self._clear_screen)
         self.btn_reset = QPushButton("重连 shell")
@@ -190,6 +207,51 @@ class TerminalPanel(QWidget):
             }
         """)
 
+    # ============================================================
+    # 命令片段
+    # ============================================================
+    def _refresh_snippets(self):
+        """刷新下拉框"""
+        self.snippet_combo.blockSignals(True)
+        self.snippet_combo.clear()
+        self.snippet_combo.addItem("-- 选择命令片段 --", "")
+        for s in self.snippet_mgr.list_all():
+            self.snippet_combo.addItem(f"{s['name']}  ({s['cmd'][:30]})", s["cmd"])
+        self.snippet_combo.blockSignals(False)
+
+    def _on_snippet_selected(self, index: int):
+        """选择片段后发送命令到终端"""
+        if index <= 0:
+            return
+        cmd = self.snippet_combo.itemData(index)
+        if not cmd:
+            return
+        # 重置下拉框选中项（让用户能重复选同一个）
+        self.snippet_combo.blockSignals(True)
+        self.snippet_combo.setCurrentIndex(0)
+        self.snippet_combo.blockSignals(False)
+        # 发送命令
+        self.send_command(cmd)
+
+    def send_command(self, cmd: str):
+        """发送一条命令到远程 shell（自动加换行）"""
+        if not self.chan or not self._connected:
+            self._set_status("未连接，无法发送命令", "#c62828")
+            return
+        data = cmd.encode("utf-8", errors="replace")
+        if not cmd.endswith("\n"):
+            data += b"\n"
+        try:
+            self.chan.send(data)
+        except Exception as e:
+            self._set_status(f"发送失败: {e}", "#c62828")
+
+    def _open_snippet_manager(self):
+        from .snippet_dialog import SnippetManagerDialog
+        dlg = SnippetManagerDialog(self.snippet_mgr, self)
+        dlg.exec_()
+        self._refresh_snippets()
+
     # ============================================================
     # 生命周期
     # ============================================================