Add a :quickmark-del command.

doc/help/commands.asciidoc

@@ -23,6 +23,7 @@
 |<<paste,paste>>|Open a page from the clipboard.
 |<<print,print>>|Print the current/[count]th tab.
 |<<quickmark-add,quickmark-add>>|Add a new quickmark.
+|<<quickmark-del,quickmark-del>>|Delete a quickmark.
 |<<quickmark-load,quickmark-load>>|Load a quickmark.
 |<<quickmark-save,quickmark-save>>|Save the current page as a quickmark.
 |<<quit,quit>>|Quit qutebrowser.
@@ -281,6 +282,15 @@ Add a new quickmark.
 * +'url'+: The url to add as quickmark.
 * +'name'+: The name for the new quickmark.
 
+[[quickmark-del]]
+=== quickmark-del
+Syntax: +:quickmark-del 'name'+
+
+Delete a quickmark.
+
+==== positional arguments
+* +'name'+: The name of the quickmark to delete.
+
 [[quickmark-load]]
 === quickmark-load
 Syntax: +:quickmark-load [*--tab*] [*--bg*] [*--window*] 'name'+

qutebrowser/browser/quickmarks.py

@@ -110,6 +110,21 @@ class QuickmarkManager(QObject):
         else:
             set_mark()
 
+    @cmdutils.register(instance='quickmark-manager', split=False,
+                       completion=[usertypes.Completion.quickmark_by_name])
+    def quickmark_del(self, name):
+        """Delete a quickmark.
+
+        Args:
+            name: The name of the quickmark to delete.
+        """
+        try:
+            del self.marks[name]
+        except KeyError:
+            raise cmdexc.CommandError("Quickmark '{}' not found!".format(name))
+        else:
+            self.changed.emit()
+
     def get(self, name):
         """Get the URL of the quickmark named name as a QUrl."""
         if name not in self.marks: