feat: add is_navigable to item hierarchy

src/items/AItems.py

@@ -1,4 +1,4 @@
-from abc import ABC
+from abc import ABC, abstractmethod
 from pathlib import Path
 
 
@@ -27,6 +27,10 @@ class AItem(ABC):
     def __str__(self) -> str:
         return f"{self.name}, {self.size}, {self.permissions}"
 
+    @abstractmethod
+    def is_navigable(self) -> bool:
+        ...
+
     @property
     def path(self) -> Path:
         return self._path

src/items/File.py

@@ -7,3 +7,6 @@ class File(AItem):
 
     def __init__(self, path: Path) -> None:
         super().__init__(path)
+
+    def is_navigable(self) -> bool:
+        return False

src/items/Folder.py

@@ -23,3 +23,6 @@ class Folder(AItem):
             except FileNotFoundError:
                 pass
         return items
+
+    def is_navigable(self) -> bool:
+        return True

src/items/Symlink.py

@@ -29,3 +29,8 @@ class Symlink(AItem):
     @property
     def point_to(self) -> Path:
         return self._point_to
+
+    def is_navigable(self) -> bool:
+        if None is self.point_to:
+            return False
+        return self.point_to.is_dir()