Add OSGetter implementation of DirGetter

- init dirgetter.getter
- add OSGetter class

tubot/dirgetter/abc.py

@@ -11,7 +11,9 @@ from tubot.dirgetter.types import GetterTypes
 
 
 class DirGetter(IValidatable, ABC):
-
+    """
+    DirectoryGetter Abstract class
+    """
     _gtype: GetterTypes
 
     def __init__(self) -> None:

tubot/dirgetter/getter.py

@@ -0,0 +1,40 @@
+# -*- coding: utf-8 -*-
+
+####################################
+# Directory-Getter implementations #
+####################################
+
+# Imports
+from tubot.dirgetter.types import GetterTypes
+from tubot.dirgetter.abc import DirGetter
+from aiofiles.os import listdir
+from aiofiles.ospath import isdir
+
+
+class OSGetter(DirGetter):
+    """
+    Python.os module implementation of DirectoryGetter
+    """
+    _gtype = GetterTypes.OS
+    base_dir: str
+
+    def __init__(self, base_dir: str) -> None:
+        """
+        :param base_dir: Path to parent directory
+        """
+        super().__init__()
+        self.base_dir = base_dir
+
+    @property
+    async def folders(self) -> dict:
+        dirs = {}
+        ls = await listdir(self.base_dir)
+        if len(ls) == 0:
+            raise ValueError("No dirs found")
+        for item in ls:
+            if await isdir(f"{self.base_dir}/{item}"):
+                dirs[item] = f"{self.base_dir}/{item}"
+        return dirs
+
+    async def __validate__(self) -> bool:
+        return await isdir(self.base_dir)