Use docstring_parser.description for help (fix #469)

src/tyro/_docstrings.py

@@ -364,20 +364,11 @@ def get_callable_description(f: Callable) -> str:
     if docstring is None:
         return ""
 
-    docstring = _strings.dedent(docstring)
-
     if dataclasses.is_dataclass(f):
         default_doc = f.__name__ + str(inspect.signature(f)).replace(" -> None", "")  # type: ignore
         if docstring == default_doc:
             return ""
 
     import docstring_parser
 
-    parsed_docstring = docstring_parser.parse(docstring)
-
-    parts: List[str] = []
-    if parsed_docstring.short_description is not None:
-        parts.append(parsed_docstring.short_description)
-    if parsed_docstring.long_description is not None:
-        parts.append(parsed_docstring.long_description)
-    return "\n".join(parts)
+    return docstring_parser.parse(docstring).description

tests/test_helptext.py

@@ -39,6 +39,22 @@ class Helptext:
     assert "Documentation 3 (default: 3)" in helptext
 
 
+def test_helptext_paragraphs() -> None:
+    @dataclasses.dataclass
+    class Helptext:
+        """
+        First
+
+        Second
+
+        Third
+        """
+
+    usage, *lines = get_helptext_with_checks(Helptext).split("\n")
+    assert usage.startswith("usage:")
+    assert lines[:7] == ["", "First", "", "Second", "", "Third", ""]
+
+
 def test_helptext_sphinx_autodoc_style() -> None:
     @dataclasses.dataclass
     class Helptext: