Add initial object registry.

qutebrowser/app.py

@@ -53,6 +53,7 @@ class Application(QApplication):
     """Main application instance.
 
     Attributes:
+        obj: The object registry.
         mainwindow: The MainWindow QWidget.
         debugconsole: The ConsoleWidget for debugging.
         commandrunner: The main CommandRunner instance.
@@ -93,6 +94,7 @@ class Application(QApplication):
             'tabs': False,
             'main': False,
         }
+        self.obj = utypes.ObjectRegistry()
         self._timers = []
         self._shutting_down = False
         self._keyparsers = None

qutebrowser/utils/usertypes.py

@@ -381,3 +381,64 @@ class Timer(QTimer):
             super().start(msec)
         else:
             super().start()
+
+
+class ObjectRegistry:
+
+    """A registry of long-living objects in qutebrowser.
+
+    Inspired by the eric IDE code (E5Gui/E5Application.py).
+    """
+
+    def __init__(self):
+        self._objects = {}
+        self._objects['global'] = {}
+
+    def get(self, name, scope='global'):
+        """Get an object from the object registry.
+
+        Args:
+            name: The name of the object to get.
+            scope: The scope the object is registered in.
+
+        Return:
+            The registered object.
+        """
+        try:
+            objects = self._objects[scope]
+        except KeyError:
+            raise KeyError("Invalid scope '{}'.".format(scope))
+        try:
+            obj = objects[name]
+        except KeyError:
+            raise KeyError("No object '{}' in scope '{}'!".format(obj, scope))
+        return obj
+
+    def register(self, name, obj, scope='global'):
+        """Register an object in the object registry.
+
+        Args:
+            name: The name to register the object as.
+            obj: The object to register.
+            scope: The scope to register the object in.
+        """
+        if scope not in self._objects:
+            raise KeyError("Invalid scope '{}'.".format(scope))
+        if name in self._objects[scope]:
+            existing_obj = self._objects[scope][name]
+            raise KeyError("Object '{}' is already registered in scope "
+                           "'{}' ({})!".format(name, scope, existing_obj))
+        self._objects[scope][name] = obj
+
+    def dump_objects(self):
+        """Dump all objects as a string."""
+        lines = []
+        count = 0
+        for scope, objects in self._objects.items():
+            if objects:
+                lines.append("Scope {}:".format(scope))
+            for name, obj in objects.items():
+                lines.append("     {}: {}".format(name, repr(obj)))
+                count += 1
+        lines.insert(0, '{} qutebrowser objects:'.format(count))
+        return lines