Clean up Question objects correctly

doc/TODO

@@ -50,7 +50,6 @@ Downloads
 Improvements / minor features
 =============================
 
-- Make sure Question objects are deleteLater'ed correctly.
 - qutebrowser local_file.foo   should open that file in $PWD
 - Distinction between :q and :wq, add ZZ and ZQ shortcuts.
 - set_toggle to toggle setting between two states

qutebrowser/browser/downloads.py

@@ -389,11 +389,10 @@ class DownloadManager(QObject):
         q.default = suggested_filename
         q.answered.connect(download.set_filename)
         q.cancelled.connect(download.cancel)
-        q.answered.connect(q.deleteLater)
+        q.completed.connect(q.deleteLater)
-        q.cancelled.connect(q.deleteLater)
+        q.destroyed.connect(partial(self.questions.remove, q))
         self.questions.append(q)
         download.cancelled.connect(q.abort)
-        download.cancelled.connect(q.deleteLater)
         message.instance().ask(q, blocking=False)
 
     @pyqtSlot(DownloadItem)

qutebrowser/utils/message.py

@@ -97,6 +97,7 @@ def ask_async(message, mode, handler, default=None):
     q.mode = mode
     q.default = default
     q.answered.connect(handler)
+    q.completed.connect(q.deleteLater)
     bridge.ask(q, blocking=False)
 
 
@@ -117,6 +118,7 @@ def confirm_async(message, yes_action, no_action=None, default=None):
     q.answered_yes.connect(yes_action)
     if no_action is not None:
         q.answered_no.connect(no_action)
+    q.completed.connect(q.deleteLater)
     bridge.ask(q, blocking=False)
 
 

qutebrowser/utils/usertypes.py

@@ -240,6 +240,10 @@ class Question(QObject):
 
     """A question asked to the user, e.g. via the status bar.
 
+    Note the creator is responsible for cleaning up the question after it
+    doesn't need it anymore, e.g. via connecting Question.completed to
+    Question.deleteLater.
+
     Attributes:
         mode: A PromptMode enum member.
               yesno: A question which can be answered with yes/no.
@@ -256,8 +260,6 @@ class Question(QObject):
 
     Signals:
         answered: Emitted when the question has been answered by the user.
-                  This is emitted from qutebrowser.widgets.statusbar._prompt so
-                  it can be emitted after the mode is left.
                   arg: The answer to the question.
         cancelled: Emitted when the question has been cancelled by the user.
         aborted: Emitted when the question was aborted programatically.
@@ -266,6 +268,7 @@ class Question(QObject):
                       answered with yes.
         answered_no: Convienience signal emitted when a yesno question was
                      answered with no.
+        completed: Emitted when the question was completed in any way.
     """
 
     answered = pyqtSignal(object)
@@ -273,6 +276,7 @@ class Question(QObject):
     aborted = pyqtSignal()
     answered_yes = pyqtSignal()
     answered_no = pyqtSignal()
+    completed = pyqtSignal()
 
     def __init__(self, parent=None):
         super().__init__(parent)
@@ -286,6 +290,21 @@ class Question(QObject):
     def __repr__(self):
         return '<{} "{}">'.format(self.__class__.__name__, self.text)
 
+    def done(self):
+        """Must be called when the queston was answered completely."""
+        self.answered.emit(self.answer)
+        if self.mode == PromptMode.yesno:
+            if self.answer:
+                self.answered_yes.emit()
+            else:
+                self.answered_no.emit()
+        self.completed.emit()
+
+    def cancel(self):
+        """Cancel the question (resulting from user-input)."""
+        self.cancelled.emit()
+        self.completed.emit()
+
     def abort(self):
         """Abort the question.
 
@@ -295,6 +314,7 @@ class Question(QObject):
         self.is_aborted = True
         try:
             self.aborted.emit()
+            self.completed.emit()
         except TypeError as e:
             # FIXME
             # We seem to get "pyqtSignal must be bound to a QObject, not

qutebrowser/widgets/statusbar/prompt.py

@@ -76,7 +76,7 @@ class Prompt(QWidget):
             self._input.setEchoMode(QLineEdit.Normal)
             self.hide_prompt.emit()
             if self.question.answer is None and not self.question.is_aborted:
-                self.question.cancelled.emit()
+                self.question.cancel()
 
     @cmdutils.register(instance='mainwindow.status.prompt', hide=True,
                        modes=['prompt'])
@@ -99,22 +99,22 @@ class Prompt(QWidget):
             self.question.answer = (self.question.user, password)
             modeman.leave('prompt', 'prompt accept')
             self.hide_prompt.emit()
-            self.question.answered.emit(self.question.answer)
+            self.question.done()
         elif self.question.mode == PromptMode.text:
             # User just entered text.
             self.question.answer = self._input.text()
             modeman.leave('prompt', 'prompt accept')
-            self.question.answered.emit(self.question.answer)
+            self.question.done()
         elif self.question.mode == PromptMode.yesno:
             # User wants to accept the default of a yes/no question.
             self.question.answer = self.question.default
             modeman.leave('yesno', 'yesno accept')
-            self.question.answered.emit(self.question.answer)
+            self.question.done()
         elif self.question.mode == PromptMode.alert:
             # User acknowledged an alert
             self.question.answer = None
             modeman.leave('prompt', 'alert accept')
-            self.question.answered.emit(self.question.answer)
+            self.question.done()
         else:
             raise ValueError("Invalid question mode!")
 
@@ -127,8 +127,7 @@ class Prompt(QWidget):
             return
         self.question.answer = True
         modeman.leave('yesno', 'yesno accept')
-        self.question.answered.emit(self.question.answer)
+        self.question.done()
-        self.question.answered_yes.emit()
 
     @cmdutils.register(instance='mainwindow.status.prompt', hide=True,
                        modes=['yesno'])
@@ -139,8 +138,7 @@ class Prompt(QWidget):
             return
         self.question.answer = False
         modeman.leave('yesno', 'prompt accept')
-        self.question.answered.emit(self.question.answer)
+        self.question.done()
-        self.question.answered_no.emit()
 
     @pyqtSlot(Question, bool)
     def ask_question(self, question, blocking):