Add type hints for utils.message

mypy.ini

@@ -137,3 +137,7 @@ disallow_incomplete_defs = True
 [mypy-qutebrowser.utils.log]
 disallow_untyped_defs = True
 disallow_incomplete_defs = True
+
+[mypy-qutebrowser.utils.message]
+disallow_untyped_defs = True
+disallow_incomplete_defs = True

qutebrowser/utils/message.py

@@ -23,8 +23,9 @@
 """Message singleton so we don't have to define unneeded signals."""
 
 import traceback
+import typing
 
-from PyQt5.QtCore import pyqtSignal, QObject
+from PyQt5.QtCore import pyqtSignal, QObject, QUrl
 
 from qutebrowser.utils import usertypes, log, utils
 
@@ -82,11 +83,14 @@ def info(message: str, *, replace: bool = False) -> None:
     global_bridge.show(usertypes.MessageLevel.info, message, replace)
 
 
-def _build_question(title, text=None, *, mode, default=None, abort_on=(),
-                    url=None, option=None):
+def _build_question(title: str,
+                    text: str = None, *,
+                    mode: usertypes.PromptMode,
+                    default: typing.Union[None, bool, str] = None,
+                    abort_on: typing.Iterable[pyqtSignal] = (),
+                    url: QUrl = None,
+                    option: str = None) -> usertypes.Question:
     """Common function for ask/ask_async."""
-    if not isinstance(mode, usertypes.PromptMode):
-        raise TypeError("Mode {} is no PromptMode member!".format(mode))
     question = usertypes.Question()
     question.title = title
     question.text = text
@@ -106,7 +110,7 @@ def _build_question(title, text=None, *, mode, default=None, abort_on=(),
     return question
 
 
-def ask(*args, **kwargs):
+def ask(*args: typing.Any, **kwargs: typing.Any) -> typing.Any:
     """Ask a modular question in the statusbar (blocking).
 
     Args:
@@ -128,7 +132,10 @@ def ask(*args, **kwargs):
     return answer
 
 
-def ask_async(title, mode, handler, **kwargs):
+def ask_async(title: str,
+              mode: usertypes.PromptMode,
+              handler: typing.Callable[[typing.Any], None],
+              **kwargs: typing.Any) -> None:
     """Ask an async question in the statusbar.
 
     Args:
@@ -144,8 +151,10 @@ def ask_async(title, mode, handler, **kwargs):
     global_bridge.ask(question, blocking=False)
 
 
-def confirm_async(*, yes_action, no_action=None, cancel_action=None,
-                  **kwargs):
+def confirm_async(*, yes_action: typing.Callable[[], None],
+                  no_action: typing.Callable[[], None] = None,
+                  cancel_action: typing.Callable[[], None] = None,
+                  **kwargs: typing.Any) -> usertypes.Question:
     """Ask a yes/no question to the user and execute the given actions.
 
     Args:
@@ -204,12 +213,15 @@ class GlobalMessageBridge(QObject):
     mode_left = pyqtSignal(usertypes.KeyMode)
     clear_messages = pyqtSignal()
 
-    def __init__(self, parent=None):
+    def __init__(self, parent: QObject = None) -> None:
         super().__init__(parent)
         self._connected = False
-        self._cache = []
+        self._cache = [
+        ]  # type: typing.List[typing.Tuple[usertypes.MessageLevel, str, bool]]
 
-    def ask(self, question, blocking, *, log_stack=False):
+    def ask(self, question: usertypes.Question,
+            blocking: bool, *,
+            log_stack: bool = False) -> None:
         """Ask a question to the user.
 
         Note this method doesn't return the answer, it only blocks. The caller
@@ -223,14 +235,16 @@ class GlobalMessageBridge(QObject):
         """
         self.ask_question.emit(question, blocking)
 
-    def show(self, level, text, replace=False):
+    def show(self, level: usertypes.MessageLevel,
+             text: str,
+             replace: bool = False) -> None:
         """Show the given message."""
         if self._connected:
             self.show_message.emit(level, text, replace)
         else:
             self._cache.append((level, text, replace))
 
-    def flush(self):
+    def flush(self) -> None:
         """Flush messages which accumulated while no handler was connected.
 
         This is so we don't miss messages shown during some early init phase.
@@ -256,10 +270,10 @@ class MessageBridge(QObject):
     s_set_text = pyqtSignal(str)
     s_maybe_reset_text = pyqtSignal(str)
 
-    def __repr__(self):
+    def __repr__(self) -> str:
         return utils.get_repr(self)
 
-    def set_text(self, text, *, log_stack=False):
+    def set_text(self, text: str, *, log_stack: bool = False) -> None:
         """Set the normal text of the statusbar.
 
         Args:
@@ -270,7 +284,7 @@ class MessageBridge(QObject):
         log.message.debug(text)
         self.s_set_text.emit(text)
 
-    def maybe_reset_text(self, text, *, log_stack=False):
+    def maybe_reset_text(self, text: str, *, log_stack: bool = False) -> None:
         """Reset the text in the statusbar if it matches an expected text.
 
         Args: