Add a :debug-webaction command.

doc/help/commands.asciidoc

@@ -947,6 +947,7 @@ These commands are mainly intended for debugging. They are hidden if qutebrowser
 |<<debug-crash,debug-crash>>|Crash for debugging purposes.
 |<<debug-pyeval,debug-pyeval>>|Evaluate a python string and display the results as a web page.
 |<<debug-trace,debug-trace>>|Trace executed code via hunter.
+|<<debug-webaction,debug-webaction>>|Execute a webaction.
 |==============
 [[debug-all-objects]]
 === debug-all-objects
@@ -995,3 +996,17 @@ Trace executed code via hunter.
 * This command does not split arguments after the last argument and handles quotes literally.
 * With this command, +;;+ is interpreted literally instead of splitting off a second command.
 
+[[debug-webaction]]
+=== debug-webaction
+Syntax: +:debug-webaction 'action'+
+
+Execute a webaction.
+
+See http://doc.qt.io/qt-5/qwebpage.html#WebAction-enum for the available actions.
+
+==== positional arguments
+* +'action'+: The action to execute, e.g. MoveToNextChar.
+
+==== count
+How many times to repeat the action.
+

qutebrowser/browser/commands.py

@@ -1150,3 +1150,23 @@ class CommandDispatcher:
             flags |= QWebPage.FindBackward
         for _ in range(count):
             view.search(view.search_text, flags)
+
+    @cmdutils.register(instance='command-dispatcher', scope='window',
+                       count='count', debug=True)
+    def debug_webaction(self, action, count=1):
+        """Execute a webaction.
+
+        See http://doc.qt.io/qt-5/qwebpage.html#WebAction-enum for the
+        available actions.
+
+        Args:
+            action: The action to execute, e.g. MoveToNextChar.
+            count: How many times to repeat the action.
+        """
+        member = getattr(QWebPage, action, None)
+        if not isinstance(member, QWebPage.WebAction):
+            raise cmdexc.CommandError("{} is not a valid web action!".format(
+                acction))
+        view = self._current_widget()
+        for _ in range(count):
+            view.triggerPageAction(member)