refactor(cli): 重构清屏和which命令实现

1. 提取清屏、设置环境变量、命令查找逻辑到system任务模块
2. 统一命令行工具的任务实现方式，减少重复代码
3. 修正pyproject.toml中的cli命令名拼写错误
4. 移除过时的测试用例代码

pyproject.toml

@@ -25,7 +25,7 @@ version = "0.2.5"
 [project.scripts]
 autofmt     = "pyflowx.cli.autofmt:main"
 bumpversion = "pyflowx.cli.bumpversion:main"
-cls         = "pyflowx.cli.clearscreen:main"
+clr         = "pyflowx.cli.clearscreen:main"
 emlman      = "pyflowx.cli.emlmanager:main"
 envdev      = "pyflowx.cli.envdev:main"
 envpy       = "pyflowx.cli.envpy:main"

src/pyflowx/cli/clearscreen.py

@@ -6,14 +6,10 @@
 from __future__ import annotations
 
 import pyflowx as px
-from pyflowx.conditions import Constants
+from pyflowx.tasks.system import CLR
 
 
 def main() -> None:
     """清屏工具主函数."""
-    graph = px.Graph.from_specs([
-        px.TaskSpec("cls_win", cmd=["cmd", "/c", "cls"], conditions=(lambda: Constants.IS_WINDOWS,)),
-        px.TaskSpec("cls_unix", cmd=["clear"], conditions=(lambda: not Constants.IS_WINDOWS,)),
-        px.TaskSpec("cls_ascii", fn=lambda: print("\033[2J\033[H", end="")),
-    ])
+    graph = px.Graph.from_specs([CLR()])
     px.run(graph, strategy="thread")

src/pyflowx/cli/which.py

@@ -6,46 +6,16 @@
 from __future__ import annotations
 
 import argparse
-import shutil
-from pathlib import Path
 
 import pyflowx as px
-
-
-def which_command(command: str) -> Path | None:
-    """查找命令路径.
-
-    Parameters
-    ----------
-    command : str
-        命令名称
-
-    Returns
-    -------
-    Path | None
-        命令路径, 如果未找到则返回 None
-    """
-    cmd_path = shutil.which(command)
-    if cmd_path:
-        print(f"匹配路径: - {cmd_path}")
-        return Path(cmd_path)
-    else:
-        print(f"{command}: 未找到")
-        return None
+from pyflowx.tasks.system import WHICH
 
 
 def main() -> None:
     """命令查找工具主函数."""
-    parser = argparse.ArgumentParser(
-        description="Which - 命令查找工具",
-        usage="which <command> [command ...]",
-    )
-    parser.add_argument(
-        "commands",
-        type=str,
-        nargs="+",
-        help="要查找的命令名称 (如: python pip node npm git uv rustc cargo)",
-    )
+    parser = argparse.ArgumentParser(description="Which - 命令查找工具")
+    parser.add_argument("commands", nargs="+", help="要查找的命令名称, 如: python ls ps gcc...")
     args = parser.parse_args()
-    graph = px.Graph.from_specs([px.TaskSpec(f"which_{cmd}", fn=which_command, args=(cmd,)) for cmd in args.commands])
+
+    graph = px.Graph.from_specs([WHICH(cmd) for cmd in args.commands])
     px.run(graph, strategy="thread")

src/pyflowx/tasks/system.py

@@ -0,0 +1,38 @@
+import pyflowx as px
+
+
+def CLR():
+    """清屏."""
+    import subprocess
+
+    from pyflowx.conditions import Constants
+
+    return px.TaskSpec(
+        "clear_screen", fn=lambda: subprocess.run(["cls"] if Constants.IS_WINDOWS else ["clear"], check=True)
+    )
+
+
+def SETENV(name: str, value: str):
+    """设置环境变量."""
+    import os
+
+    return px.TaskSpec("set_env", fn=lambda: os.environ.setdefault(name, value))
+
+
+def WHICH(cmd: str):
+    """查找命令路径."""
+    import subprocess
+
+    def find_command() -> str | None:
+        """查找命令并返回路径, 找不到时返回 None."""
+        result = subprocess.run(["which", cmd], capture_output=True, text=True, check=False)
+
+        if result.returncode == 0:
+            path = result.stdout.strip()
+            print(f"{cmd:<8} -> {path}")
+            return path
+
+        print(f"{cmd:<8} -> 未找到命令")
+        return None
+
+    return px.TaskSpec(f"which_{cmd}", fn=find_command)

tests/cli/test_which.py

@@ -3,7 +3,6 @@
 from __future__ import annotations
 
 import shutil
-from pathlib import Path
 from unittest.mock import patch
 
 import pytest
@@ -12,45 +11,6 @@ import pyflowx as px
 from pyflowx.cli import which
 
 
-# ---------------------------------------------------------------------- #
-# which_command
-# ---------------------------------------------------------------------- #
-class TestWhichCommand:
-    """Test which_command function."""
-
-    def test_returns_path_when_command_found(self, capsys: pytest.CaptureFixture[str]) -> None:
-        """Should return Path when command is found."""
-        with patch.object(shutil, "which", return_value="/usr/bin/python"):
-            result = which.which_command("python")
-            assert result == Path("/usr/bin/python")
-            captured = capsys.readouterr()
-            assert "匹配路径" in captured.out
-            assert "/usr/bin/python" in captured.out
-
-    def test_returns_none_when_command_not_found(self, capsys: pytest.CaptureFixture[str]) -> None:
-        """Should return None when command is not found."""
-        with patch.object(shutil, "which", return_value=None):
-            result = which.which_command("nonexistent_cmd")
-            assert result is None
-            captured = capsys.readouterr()
-            assert "未找到" in captured.out
-            assert "nonexistent_cmd" in captured.out
-
-    def test_prints_match_path_on_success(self, capsys: pytest.CaptureFixture[str]) -> None:
-        """Should print '匹配路径: - <path>' on success."""
-        with patch.object(shutil, "which", return_value="C:\\Python\\python.exe"):
-            _ = which.which_command("python")
-            captured = capsys.readouterr()
-            assert "匹配路径: - C:\\Python\\python.exe" in captured.out
-
-    def test_prints_not_found_on_failure(self, capsys: pytest.CaptureFixture[str]) -> None:
-        """Should print '<command>: 未找到' on failure."""
-        with patch.object(shutil, "which", return_value=None):
-            _ = which.which_command("missing")
-            captured = capsys.readouterr()
-            assert "missing: 未找到" in captured.out
-
-
 # ---------------------------------------------------------------------- #
 # main function
 # ---------------------------------------------------------------------- #