move backend dependent code to AbstractAction respective classes

qutebrowser/browser/browsertab.py

@@ -139,6 +139,10 @@ class AbstractAction:
             raise WebTabError("{} is not a valid web action!".format(name))
         self._widget.triggerPageAction(member)
 
+    def show_source(self, dispatcher, url):
+        """Show the source of the current page in a new tab."""
+        raise NotImplementedError
+
 
 class AbstractPrinting:
 

qutebrowser/browser/commands.py

@@ -1511,33 +1511,7 @@ class CommandDispatcher:
         except cmdexc.CommandError as e:
             message.error(str(e))
             return
-
-        if tab.backend == usertypes.Backend.QtWebEngine:
-            # use view-source: scheme to show page source for webengine
-            url = QUrl('view-source:{}'.format(current_url.toString()))
-            new_tab = self._tabbed_browser.tabopen(
-                url, background=True, related=True)
-            new_tab.data.viewing_source = True
-            return
-
-        def show_source_cb(source):
-            """Show source as soon as it's ready."""
-            # WORKAROUND for https://github.com/PyCQA/pylint/issues/491
-            # pylint: disable=no-member
-            lexer = pygments.lexers.HtmlLexer()
-            formatter = pygments.formatters.HtmlFormatter(
-                full=True, linenos='table',
-                title='Source for {}'.format(current_url.toDisplayString()))
-            # pylint: enable=no-member
-            highlighted = pygments.highlight(source, lexer, formatter)
-
-            new_tab = self._tabbed_browser.tabopen()
-            new_tab.set_html(highlighted)
-            new_tab.data.viewing_source = True
-            new_tab.url = lambda requested=False: QUrl(
-                'Source: {}'.format(current_url.toDisplayString()))
-
-        tab.dump_async(show_source_cb)
+        tab.action.show_source(self, current_url)
 
     @cmdutils.register(instance='command-dispatcher', scope='window',
                        debug=True)

qutebrowser/browser/webengine/webenginetab.py

@@ -99,6 +99,13 @@ class WebEngineAction(browsertab.AbstractAction):
         """Save the current page."""
         self._widget.triggerPageAction(QWebEnginePage.SavePage)
 
+    def show_source(self, dispatcher, url):
+        # use view-source: scheme to show page source for webengine
+        url = QUrl('view-source:{}'.format(url.toString()))
+        new_tab = dispatcher._tabbed_browser.tabopen(
+            url, background=True, related=True)
+        new_tab.data.viewing_source = True
+
 
 class WebEnginePrinting(browsertab.AbstractPrinting):
 

qutebrowser/browser/webkit/webkittab.py

@@ -23,6 +23,10 @@ import re
 import functools
 import xml.etree.ElementTree
 
+import pygments
+import pygments.lexers
+import pygments.formatters
+
 import sip
 from PyQt5.QtCore import (pyqtSlot, Qt, QEvent, QUrl, QPoint, QTimer, QSizeF,
                           QSize)
@@ -50,6 +54,25 @@ class WebKitAction(browsertab.AbstractAction):
         """Save the current page."""
         raise browsertab.UnsupportedOperationError
 
+    def show_source(self, dispatcher, url):
+        def show_source_cb(source):
+            """Show source as soon as it's ready."""
+            # WORKAROUND for https://github.com/PyCQA/pylint/issues/491
+            # pylint: disable=no-member
+            lexer = pygments.lexers.HtmlLexer()
+            formatter = pygments.formatters.HtmlFormatter(
+                full=True, linenos='table',
+                title='view-source:{}'.format(url.toDisplayString()))
+            # pylint: enable=no-member
+            highlighted = pygments.highlight(source, lexer, formatter)
+
+            new_tab = dispatcher._tabbed_browser.tabopen()
+            new_tab.set_html(highlighted)
+            new_tab.data.viewing_source = True
+            new_tab.url = lambda requested=False: QUrl(
+                'view-source:' + url.toDisplayString())
+        dispatcher._current_widget().dump_async(show_source_cb)
+
 
 class WebKitPrinting(browsertab.AbstractPrinting):
 

tests/end2end/features/history.feature

@@ -69,7 +69,7 @@ Feature: Page history
     Scenario: History with view-source URL
         When I open data/title.html
         And I run :view-source
-        And I wait for "Changing title for idx * to 'Source for http://localhost:*/data/title.html'" in the log
+        And I wait for "Changing title for idx * to 'view-source:http://localhost:*/data/title.html'" in the log
         Then the history should contain:
             http://localhost:(port)/data/title.html Test title