Add only/co command

TODO

@@ -284,9 +284,6 @@ Open quickmark in a new tab (command tab_quickmark, aliases: tabqmarks).
 tab-handling
 ------------
 
-co
-Close all tabs except for the current one (command only).
-
 [n]T
 Focus nth tab, first tab if n is omitted or last tab if n is 0. (command focus_tab, aliases: tab).
 

qutebrowser/config/configdata.py

@@ -547,6 +547,7 @@ DATA = OrderedDict([
         ('gO', 'tabopencur'),
         ('ga', 'tabopen about:blank'),
         ('d', 'tabclose'),
+        ('co', 'only'),
         ('J', 'tabnext'),
         ('K', 'tabprev'),
         ('r', 'reload'),

qutebrowser/widgets/_tabbedbrowser.py

@@ -248,6 +248,14 @@ class TabbedBrowser(TabWidget):
         elif last_close == 'blank':
             tab.openurl('about:blank')
 
+    @cmdutils.register(instance='mainwindow.tabs')
+    def only(self):
+        """Close all tabs except for the current one."""
+        for i in range(self.count() - 1):
+            if i == self.currentIndex():
+                continue
+            self._close_tab(self.widget(i))
+
     @cmdutils.register(instance='mainwindow.tabs', split=False, name='tabopen')
     def tabopen_cmd(self, url):
         """Open a new tab with a given url."""