set_bindings can now update or replace existing bindings

rtv/objects.py

@@ -642,15 +642,17 @@ class KeyMap(object):
         self._keymap = None
         self.set_bindings(bindings)
 
-    def set_bindings(self, bindings):
-        # Clear the keymap before applying the bindings to avoid confusion.
-        # If a user defines custom bindings in their config file, they must
-        # explicitly define ALL of the bindings.
-        self._keymap = {}
+    def set_bindings(self, bindings, mode='update'):
+        new_keymap = {}
         for command, keys in bindings.items():
             if not isinstance(command, Command):
                 command = Command(command)
-            self._keymap[command] = keys
+            new_keymap[command] = keys
+
+        if not self._keymap or mode == 'replace':
+            self._keymap = new_keymap
+        elif mode == 'update':
+            self._keymap.update(new_keymap)
 
     def get(self, command):
         if not isinstance(command, Command):

tests/test_config.py

@@ -136,7 +136,7 @@ def test_config_from_file():
 
         fargs, fbindings = Config.get_file(filename=fp.name)
         config = Config(**fargs)
-        config.keymap.set_bindings(fbindings)
+        config.keymap.set_bindings(fbindings, 'replace')
         assert config.config == {}
         assert config.keymap._keymap == {}
 
@@ -153,7 +153,7 @@ def test_config_from_file():
         fp.flush()
         fargs, fbindings = Config.get_file(filename=fp.name)
         config.update(**fargs)
-        config.keymap.set_bindings(fbindings)
+        config.keymap.set_bindings(fbindings, 'replace')
         assert config.config == args
         assert config.keymap.get('REFRESH') == ['r', '<KEY_F5>']
         assert config.keymap.get('UPVOTE') == ['']

tests/test_objects.py

@@ -370,13 +370,16 @@ def test_objects_keymap():
         keymap.get('downvote')
     assert 'DOWNVOTE' in six.text_type(e)
 
-    # Updating the bindings wipes out the old ones
     bindings = {'refresh': ['a', 0x12, '<LF>', '<KEY_UP>']}
-    keymap.set_bindings(bindings)
+    bindings2 = {'upvote': ['b', 0x13, '<KEY_DOWN>']}
+    keymap.set_bindings(bindings, 'replace')
     assert keymap.get('refresh')
     with pytest.raises(exceptions.ConfigError) as e:
         keymap.get('upvote')
     assert 'UPVOTE' in six.text_type(e)
+    keymap.set_bindings(bindings2, 'update')
+    assert keymap.get('refresh')
+    assert keymap.get('upvote')
 
     # Strings should be parsed correctly into keys
     assert KeyMap.parse('a') == 97