Start implementing auto_insert_mode

TODO

@@ -4,8 +4,6 @@ keyparser foo
 - Handle keybind to get out of insert mode (e.g. esc)
 - Switch to normal mode if new page loaded
 - Add passthrough-keys option to pass through unmapped keys
-- Add auto-insert-mode to switch to insert mode if editable element is focused
-  after page load
 - Add more element-selection-detection code (with options?) based on:
       -> javascript: http://stackoverflow.com/a/2848120/2085149
       -> microFocusChanged and check active element via:

qutebrowser/config/configdata.py

@@ -171,6 +171,11 @@ DATA = OrderedDict([
          SettingValue(types.Bool(), "true"),
          "Whether to switch to insert mode when clicking flash and other "
          "plugins."),
+
+        ('auto_insert_mode',
+         SettingValue(types.Bool(), "true"),
+         "Whether to automatically enter insert mode if an editable element "
+         "is focused after page load."),
     )),
 
     ('tabbar', sect.KeyValue(

qutebrowser/utils/modemanager.py

@@ -52,6 +52,14 @@ def leave(mode):
     manager.leave(mode)
 
 
+def maybe_leave(mode):
+    """Convenience method to leave 'mode' without exceptions."""
+    try:
+        manager.leave(mode)
+    except ValueError:
+        pass
+
+
 class ModeManager(QObject):
 
     """Manager for keyboard modes.

qutebrowser/widgets/browsertab.py

@@ -85,6 +85,7 @@ class BrowserTab(QWebView):
         self.page_.setLinkDelegationPolicy(QWebPage.DelegateAllLinks)
         self.page_.linkHovered.connect(self.linkHovered)
         self.linkClicked.connect(self.on_link_clicked)
+        self.loadFinished.connect(self.on_load_finished)
         # FIXME find some way to hide scrollbars without setScrollBarPolicy
 
     def _init_neighborlist(self):
@@ -242,6 +243,21 @@ class BrowserTab(QWebView):
         self.setFocus()
         QApplication.postEvent(self, evt)
 
+    @pyqtSlot(bool)
+    def on_load_finished(self, ok):
+        """Handle insert mode after loading finished."""
+        if config.get('general', 'auto_insert_mode'):
+            frame = self.page_.currentFrame()
+            # FIXME better selector (from hintmanager)
+            elem = frame.findFirstElement('*:focus')
+            logging.debug("focus element: {}".format(not elem.isNull()))
+            if elem.isNull():
+                modemanager.maybe_leave("insert")
+            else:
+                modemanager.enter("insert")
+        else:
+            modemanager.maybe_leave("insert")
+
     @pyqtSlot(str)
     def set_force_open_target(self, target):
         """Change the forced link target. Setter for _force_open_target.