Replaced hasattr in dumps with supports_argument

src/libbot/__main__.py

@@ -8,6 +8,7 @@ try:
 except ImportError:
     from json import dumps, loads
 
+from ._utils import supports_argument
 from .sync._nested import nested_delete, nested_set
 
 
@@ -36,7 +37,7 @@ async def json_write(data: Any, path: Union[str, Path]) -> None:
     async with aiofiles.open(str(path), mode="w", encoding="utf-8") as f:
         await f.write(
             dumps(data, ensure_ascii=False, escape_forward_slashes=False, indent=4)
-            if hasattr(dumps, "escape_forward_slashes")
+            if supports_argument(dumps, "escape_forward_slashes")
             else dumps(data, ensure_ascii=False, indent=4)
         )
 

src/libbot/_utils.py

@@ -0,0 +1,22 @@
+import inspect
+from typing import Callable
+
+
+def supports_argument(func: Callable, arg_name: str) -> bool:
+    """Check whether a function has a specific argument
+
+    ### Args:
+        * func (`Callable`): Function to be inspected
+        * arg_name (`str`): Argument to be checked
+
+    ### Returns:
+        * `bool`: `True` if argument is supported and `False` if not
+    """
+    if hasattr(func, "__code__"):
+        return arg_name in inspect.signature(func).parameters
+    elif hasattr(func, "__doc__"):
+        if doc := func.__doc__:
+            first_line = doc.splitlines()[0]
+            return arg_name in first_line
+
+    return False

src/libbot/sync/__main__.py

@@ -1,6 +1,7 @@
 from pathlib import Path
 from typing import Any, Union
 
+from .._utils import supports_argument
 from ._nested import nested_delete, nested_set
 
 try:
@@ -34,7 +35,7 @@ def json_write(data: Any, path: Union[str, Path]) -> None:
     with open(str(path), mode="w", encoding="utf-8") as f:
         f.write(
             dumps(data, ensure_ascii=False, escape_forward_slashes=False, indent=4)
-            if hasattr(dumps, "escape_forward_slashes")
+            if supports_argument(dumps, "escape_forward_slashes")
             else dumps(data, ensure_ascii=False, indent=4)
         )
 

tests/test_utils.py

@@ -0,0 +1,24 @@
+from typing import Callable
+
+import pytest
+
+from libbot._utils import supports_argument
+
+
+def func1(foo: str, bar: str):
+    pass
+
+
+def func2(foo: str):
+    pass
+
+
+@pytest.mark.parametrize(
+    "func, arg_name, result",
+    [
+        (func1, "foo", True),
+        (func2, "bar", False),
+    ],
+)
+def test_supports_argument(func: Callable, arg_name: str, result: bool):
+    assert supports_argument(func, arg_name) == result