Allow string path arguments in directory fetcher

fimfarchive/fetchers/directory.py

@@ -25,11 +25,12 @@ Directory fetcher.
 import json
 from itertools import chain
 from pathlib import Path
-from typing import Any, Dict, Iterable, Iterator, Optional, Set
+from typing import Any, Dict, Iterable, Iterator, Optional, Set, Union
 
 from fimfarchive.exceptions import InvalidStoryError, StorySourceError
 from fimfarchive.flavors import Flavor
 from fimfarchive.stories import Story
+from fimfarchive.utils import get_path
 
 from .base import Fetcher
 
@@ -48,8 +49,8 @@ class DirectoryFetcher(Fetcher):
 
     def __init__(
             self,
-            meta_path: Path = None,
-            data_path: Path = None,
+            meta_path: Union[Path, str] = None,
+            data_path: Union[Path, str] = None,
             flavors: Iterable[Flavor] = tuple(),
             ) -> None:
         """
@@ -60,8 +61,8 @@ class DirectoryFetcher(Fetcher):
             data: The directory for story data.
             flavors: The flavors to add to stories.
         """
-        self.meta_path = meta_path
-        self.data_path = data_path
+        self.meta_path = get_path(meta_path)
+        self.data_path = get_path(data_path)
         self.length: Optional[int] = None
         self.flavors = frozenset(flavors)
 

fimfarchive/utils.py

@@ -28,6 +28,7 @@ import shutil
 from functools import partial
 from importlib import import_module
 from importlib_resources import read_binary, read_text
+from pathlib import Path
 from typing import (
     cast, Any, Callable, Dict, Iterator,
     Optional, Tuple, Type, TypeVar, Union,
@@ -42,8 +43,10 @@ from fimfarchive.stories import Story
 __all__ = (
     'Empty',
     'PersistedDict',
+    'ResourceLoader',
     'find_compressor',
     'find_flavor',
+    'get_path',
     'tqdm',
 )
 
@@ -203,6 +206,22 @@ def find_flavor(story: Story, flavor: Type[F]) -> Optional[F]:
     return None
 
 
+def get_path(source: Union[None, Path, str]) -> Optional[Path]:
+    """
+    Creates a path from an object, if one is supplied.
+
+    Args:
+        source: Object to create a path from.
+
+    Returns:
+        A resolved path instance, or None.
+    """
+    if source is None:
+        return None
+
+    return Path(source).resolve()
+
+
 class ResourceLoader:
     """
     Loads resources from a package.

tests/test_utils.py

@@ -24,12 +24,16 @@ Utility tests.
 
 import json
 import os
+from pathlib import Path
 from unittest.mock import call, patch
 
 import pytest
 
 from fimfarchive.flavors import DataFormat, MetaFormat, MetaPurity
-from fimfarchive.utils import find_flavor, Empty, JayWalker, PersistedDict
+from fimfarchive.utils import (
+    find_flavor, get_path,
+    Empty, JayWalker, PersistedDict
+)
 
 
 class TestEmpty:
@@ -291,3 +295,21 @@ class TestFindFlavor:
         """
         found = find_flavor(story, DataFormat)
         assert found is None
+
+
+class TestGetPath:
+    """
+    get_path tests.
+    """
+
+    @pytest.mark.parametrize('source,target', (
+        (None, None),
+        ('', Path().resolve()),
+        ('alpaca', Path('alpaca').resolve()),
+        (Path('alpaca'), Path('alpaca').resolve()),
+    ))
+    def test_return_values(self, source, target):
+        """
+        Tests function returns the correct value.
+        """
+        assert target == get_path(source)