Fixes #5 - Clearly define boolean handling

README.md

@@ -154,6 +154,14 @@ A parameter becomes "required" if it is an `int`, `float` or `str` and does not
 
 With more than one decorator, it's impossible to tell which function you'd like to wrap. Because of this, we enforce a single `@wrap` per file. Importing modules using `pysimplecli` is supported, as is calling said wrapped functions.
 
+### Truth table for boolean parameters
+
+| Parameter Default | Without Argument | With Argument |
+| --- | --- | --- |
+| `True` | `True` | `False` |
+| `False` | `False` | `True` |
+| no default | `False` | `True` |
+
 ## How It Works
 
 The `wrap` decorator takes the annotated parameters of a given function and maps them to corresponding command-line arguments. It relies heavily on Python's `inspect` and `tokenize` modules to gather parameters, parse comments for parameter descriptions, determine default functionality, etc...  In fact, a core part of this module is a are heavily extended `inspect.Parameter` objects.

simplecli/simplecli.py

@@ -38,10 +38,12 @@ class Empty:
     pass
 
 
+class DefaultIfBool:
+    pass
+
+
 _wrapped = False
-# Overloaded placeholder for a potential boolean
-DefaultIfBool = "Crazy going slowly am I, 6, 5, 4, 3, 2, 1, switch!"
-ValueType = Union[type[Empty], bool, float, int, str]
+ValueType = Union[type[DefaultIfBool], type[Empty], bool, float, int, str]
 ArgDict = dict[str, ValueType]
 ArgList = list[str]
 
@@ -208,6 +210,7 @@ def validate(self, value: ValueType) -> bool:
         return passed
 
     def set_value(self, value: ValueType) -> None:
+        result = value
         if self.validate(value) is False:
             raise ValueError(
                 f"'{self.help_name}' must be of type {self.help_type}"
@@ -225,13 +228,10 @@ def set_value(self, value: ValueType) -> None:
         if value is DefaultIfBool:
             if bool not in self.datatypes:
                 raise ValueError(f"'{self.help_name}' requires a value")
-            if self.default != Empty:
-                self._value = self.annotation(self.default)
-                return
-            else:
-                self._value = self.annotation(True)
-                return
-        self._value = self.annotation(value)
+            result = self.default if self.default is not Empty else True
+        elif bool in self.datatypes and self.default is Empty:
+            result = value
+        self._value = self.annotation(result)
 
 
 def tokenize_string(string: str) -> Generator[TokenInfo, None, None]:
@@ -315,6 +315,12 @@ def params_to_kwargs(
             if pos_args:
                 param.set_value(pos_args.pop(0))
             elif param.name in kw_args:
+                if kw_args[param.name] is DefaultIfBool:
+                    # Invert the default value
+                    param.set_value(
+                        True if param.default is Empty else not param.default
+                    )
+                    continue
                 param.set_value(kw_args[param.name])
                 continue
             elif param.required:

tests/test_param.py

@@ -74,7 +74,7 @@ def test_set_value():
     with pytest.raises(ValueError, match="[int, float]"):
         p1.set_value("this is the value")
 
-    with pytest.raises(ValueError, match="[int, float]"):
+    with pytest.raises(TypeError, match="[int, float]"):
         p1.set_value(DefaultIfBool)
     assert p1.value is Empty
     p1.set_value(3)

tests/test_wrap.py

@@ -181,22 +181,38 @@ def code(a: int, b: int, c: typing.Union[int, float]):
 
 
 def test_wrap_boolean_false(monkeypatch):
-    monkeypatch.setattr(sys, "argv", ["filename", "--is-false"])
+    monkeypatch.setattr(sys, "argv", ["filename"])
 
     @simplecli.wrap
     def code(is_false: bool = False):
         assert is_false is False
 
 
+def test_wrap_boolean_false_invert(monkeypatch):
+    monkeypatch.setattr(sys, "argv", ["filename", "--invert"])
+
+    @simplecli.wrap
+    def code(invert: bool = False):
+        assert invert is True
+
+
 def test_wrap_boolean_true(monkeypatch):
-    monkeypatch.setattr(sys, "argv", ["filename", "--is-true"])
+    monkeypatch.setattr(sys, "argv", ["filename"])
 
     @simplecli.wrap
     def code(is_true: bool = True):
         assert is_true is True
 
 
-def test_wrap_boolean_true_no_default(monkeypatch):
+def test_wrap_boolean_true_invert(monkeypatch):
+    monkeypatch.setattr(sys, "argv", ["filename", "--invert"])
+
+    @simplecli.wrap
+    def code(invert: bool = True):
+        assert invert is False
+
+
+def test_wrap_boolean_true_no_default_invert(monkeypatch):
     monkeypatch.setattr(sys, "argv", ["filename", "--is-something"])
 
     @simplecli.wrap