feat(conditions): add DIR_EXISTS builtin condition, update system tasks

- add Path type import and DIR_EXISTS condition method
- update reset_icon_cache tasks to add directory existence checks
- simplify explorer restart command and add installation check

src/pyflowx/conditions.py

@@ -9,6 +9,7 @@ from __future__ import annotations
 import os
 import shutil
 import sys
+from pathlib import Path
 from typing import Callable
 
 # 条件判断函数类型
@@ -86,6 +87,11 @@ class BuiltinConditions:
         _check.__name__ = f"HAS_INSTALLED({app_name!r})"
         return _check
 
+    @staticmethod
+    def DIR_EXISTS(dir: Path) -> Condition:
+        """路径是否存在."""
+        return dir.exists
+
     @staticmethod
     def ENV_VAR_EXISTS(var_name: str) -> Condition:
         """检查环境变量是否存在.

src/pyflowx/tasks/system.py

@@ -8,8 +8,10 @@ from __future__ import annotations
 
 import os
 import subprocess
+from pathlib import Path
 
 import pyflowx as px
+from pyflowx import BuiltinConditions
 from pyflowx.conditions import Constants
 
 
@@ -34,6 +36,7 @@ def reset_icon_cache() -> list[px.TaskSpec]:
         px.TaskSpec(
             "delete_icon_cache",
             fn=lambda: subprocess.run(["del", "/a", "/q", r"%localappdata%\IconCache.db"], check=False),
+            conditions=(BuiltinConditions.DIR_EXISTS(Path(r"%localappdata%\IconCache.db")),),
             verbose=True,
         ),
         px.TaskSpec(
@@ -41,11 +44,13 @@ def reset_icon_cache() -> list[px.TaskSpec]:
             fn=lambda: subprocess.run(
                 ["del", "/a", "/q", r"%localappdata%\Microsoft\Windows\Explorer\iconcache*"], check=False
             ),
+            conditions=(BuiltinConditions.DIR_EXISTS(Path(r"%localappdata%\Microsoft\Windows\Explorer")),),
             verbose=True,
         ),
         px.TaskSpec(
             "restart_explorer",
-            fn=lambda: subprocess.run(["cmd", "/c", "start", "explorer.exe"], check=False),
+            fn=lambda: subprocess.run(["explorer.exe"], check=False),
+            conditions=(BuiltinConditions.HAS_INSTALLED("explorer.exe"),),
             verbose=True,
         ),
     ]