add pathlib.Path support

omegaconf/__init__.py

@@ -14,6 +14,7 @@
     EnumNode,
     FloatNode,
     IntegerNode,
+    PathNode,
     StringNode,
     ValueNode,
 )

omegaconf/nodes.py

@@ -3,6 +3,7 @@
 import sys
 from abc import abstractmethod
 from enum import Enum
+from pathlib import Path
 from typing import Any, Dict, Optional, Type, Union
 
 from omegaconf._utils import (
@@ -179,6 +180,40 @@ def __deepcopy__(self, memo: Dict[int, Any]) -> "StringNode":
         return res
 
 
+class PathNode(ValueNode):
+    def __init__(
+        self,
+        value: Any = None,
+        key: Any = None,
+        parent: Optional[Container] = None,
+        is_optional: bool = True,
+        flags: Optional[Dict[str, bool]] = None,
+    ):
+        super().__init__(
+            parent=parent,
+            value=value,
+            metadata=Metadata(
+                key=key,
+                optional=is_optional,
+                ref_type=Path,
+                object_type=Path,
+                flags=flags,
+            ),
+        )
+
+    def _validate_and_convert_impl(self, value: Any) -> Path:
+        from omegaconf import OmegaConf
+
+        if OmegaConf.is_config(value) or is_primitive_container(value):
+            raise ValidationError("Cannot convert '$VALUE_TYPE' to Path: '$VALUE'")
+        return Path(value)
+
+    def __deepcopy__(self, memo: Dict[int, Any]) -> "PathNode":
+        res = PathNode()
+        self._deepcopy_impl(res, memo)
+        return res
+
+
 class IntegerNode(ValueNode):
     def __init__(
         self,

omegaconf/omegaconf.py

@@ -9,6 +9,7 @@
 from collections import defaultdict
 from contextlib import contextmanager
 from enum import Enum
+from pathlib import Path
 from textwrap import dedent
 from typing import (
     IO,
@@ -66,6 +67,7 @@
     EnumNode,
     FloatNode,
     IntegerNode,
+    PathNode,
     StringNode,
     ValueNode,
 )
@@ -1062,6 +1064,8 @@ def _node_wrap(
         node = BooleanNode(value=value, key=key, parent=parent, is_optional=is_optional)
     elif type_ == str:
         node = StringNode(value=value, key=key, parent=parent, is_optional=is_optional)
+    elif type_ == Path:
+        node = PathNode(value=value, key=key, parent=parent, is_optional=is_optional)
     else:
         if parent is not None and parent._get_flag("allow_objects") is True:
             node = AnyNode(value=value, key=key, parent=parent)

tests/structured_conf/test_structured_config.py

@@ -1,4 +1,6 @@
 import sys
+import pathlib
+import dataclasses
 from importlib import import_module
 from typing import Any, Dict, List, Optional
 
@@ -814,6 +816,23 @@ def test_promote_to_object(self, module: Any) -> None:
         assert OmegaConf.get_type(conf) == module.BoolConfig
         assert conf.with_default is False
 
+    def test_promote_to_dataclass(self, module: Any) -> None:
+        @dataclasses.dataclass
+        class Foo:
+            foo: pathlib.Path
+            bar: str
+            qub: int = 5
+
+        x = DictConfig({"foo": "hello.txt", "bar": "hello.txt"})
+        assert isinstance(x.foo, str)
+        assert isinstance(x.bar, str)
+
+        x._promote(Foo)
+        assert isinstance(x.foo, pathlib.Path)
+        assert isinstance(x.bar, str)
+        assert x.qub == 5
+
+
     def test_set_key_with_with_dataclass(self, module: Any) -> None:
         cfg = OmegaConf.create({"foo": [1, 2]})
         cfg.foo = module.ListClass()

tests/test_nodes.py

@@ -3,6 +3,7 @@
 import re
 from enum import Enum
 from functools import partial
+from pathlib import Path
 from typing import Any, Dict, Tuple, Type
 
 from pytest import mark, param, raises
@@ -17,6 +18,7 @@
     ListConfig,
     Node,
     OmegaConf,
+    PathNode,
     StringNode,
     ValueNode,
 )
@@ -79,6 +81,9 @@
         (lambda v: EnumNode(enum_type=Color, value=v), "Color.RED", Color.RED),
         (lambda v: EnumNode(enum_type=Color, value=v), "RED", Color.RED),
         (lambda v: EnumNode(enum_type=Color, value=v), 1, Color.RED),
+        # Path node
+        (PathNode, "hello.txt", Path("hello.txt")),
+        (PathNode, Path("hello.txt"), Path("hello.txt")),
     ],
 )
 def test_valid_inputs(type_: type, input_: Any, output_: Any) -> None: