🐛 Fix preserving case in enum values

docs/tutorial/parameter-types/enum.md

@@ -35,6 +35,14 @@ Usage: main.py [OPTIONS]
 Try "main.py --help" for help.
 
 Error: Invalid value for '--network': invalid choice: capsule. (choose from simple, conv, lstm)
+
+// Note that enums are case sensitive by default
+$ python main.py --network CONV
+
+Usage: main.py [OPTIONS]
+Try "main.py --help" for help.
+
+Error: Invalid value for '--network': invalid choice: CONV. (choose from simple, conv, lstm)
 ```
 
 </div>

tests/test_tutorial/test_parameter_types/test_enum/test_tutorial001.py

@@ -25,7 +25,22 @@ def test_main():
     assert "Training neural network of type: conv" in result.output
 
 
-def test_invalid():
+def test_invalid_case():
+    result = runner.invoke(app, ["--network", "CONV"])
+    assert result.exit_code != 0
+    # TODO: when deprecating Click 7, remove second option
+
+    assert (
+        "Invalid value for '--network': 'CONV' is not one of" in result.output
+        or "Invalid value for '--network': invalid choice: CONV. (choose from"
+        in result.output
+    )
+    assert "simple" in result.output
+    assert "conv" in result.output
+    assert "lstm" in result.output
+
+
+def test_invalid_other():
     result = runner.invoke(app, ["--network", "capsule"])
     assert result.exit_code != 0
     # TODO: when deprecating Click 7, remove second option

typer/main.py

@@ -618,13 +618,13 @@ def param_path_convertor(value: Optional[str] = None) -> Optional[Path]:
 
 
 def generate_enum_convertor(enum: Type[Enum]) -> Callable[[Any], Any]:
-    lower_val_map = {str(val.value).lower(): val for val in enum}
+    val_map = {str(val.value): val for val in enum}
 
     def convertor(value: Any) -> Any:
         if value is not None:
-            low = str(value).lower()
-            if low in lower_val_map:
-                key = lower_val_map[low]
+            val = str(value)
+            if val in val_map:
+                key = val_map[val]
                 return enum(key)
 
     return convertor