Use {} for none-dicts and fix keybindings

qutebrowser/browser/shared.py

@@ -37,10 +37,8 @@ def custom_headers():
     headers[b'DNT'] = dnt
     headers[b'X-Do-Not-Track'] = dnt
 
-    config_headers = config.val.content.custom_headers
+    for header, value in config.val.content.custom_headers.items():
-    if config_headers is not None:
+        headers[header.encode('ascii')] = value.encode('ascii')
-        for header, value in config_headers.items():
-            headers[header.encode('ascii')] = value.encode('ascii')
 
     accept_language = config.val.content.accept_language
     if accept_language is not None:

qutebrowser/commands/runners.py

@@ -104,9 +104,6 @@ class CommandParser:
             The new command string if an alias was found. Default value
             otherwise.
         """
-        if config.val.aliases is None:
-            return default
-
         parts = text.strip().split(maxsplit=1)
         try:
             alias = config.val.aliases[parts[0]]

qutebrowser/config/config.py

@@ -133,12 +133,12 @@ class KeyConfig:
 
     def get_bindings_for(self, mode):
         """Get the combined bindings for the given mode."""
-        if val.bindings.default:
+        bindings = dict(val.bindings.default[mode])
-            bindings = dict(val.bindings.default[mode])
+        for key, binding in val.bindings.commands[mode].items():
-        else:
+            if binding is None:
-            bindings = {}
+                del bindings[key]
-        if val.bindings.commands:
+            else:
-            bindings.update(val.bindings.default[mode])
+                bindings[key] = binding
         return bindings
 
     def get_reverse_bindings_for(self, mode):
@@ -188,20 +188,22 @@ class KeyConfig:
         if key in self.get_bindings_for(mode) and not force:
             raise configexc.DuplicateKeyError(key)
 
-        val.bindings.commands[mode][key] = command
+        bindings = self._config.get_obj('bindings.commands')
+        bindings[mode][key] = command
         self._config.update_mutables(save_yaml=save_yaml)
 
     def unbind(self, key, *, mode='normal', save_yaml=False):
         """Unbind the given key in the given mode."""
         key = self._prepare(key, mode)
 
-        if val.bindings.commands[mode] and key in val.bindings.commands[mode]:
+        bindings_commands = self._config.get_obj('bindings.commands')
+
+        if key in bindings_commands:
             # In custom bindings -> remove it
-            del val.bindings.commands[mode][key]
+            del bindings_commands[mode][key]
-        elif val.bindings.default[mode] and key in val.bindings.default[mode]:
+        elif key in val.bindings.default[mode]:
-            # In default bindings -> shadow it with <unbound>
+            # In default bindings -> shadow it with None
-            # FIXME:conf what value to use here?
+            bindings_commands[mode][key] = None
-            val.bindings.commands[mode][key] = '<unbound>'
         else:
             raise configexc.KeybindingError("Can't find binding '{}' in section '{}'!"
                                             .format(key, mode))

qutebrowser/config/configdata.yml

@@ -2088,14 +2088,6 @@ bindings.default:
 
 bindings.commands:
   default: {}
-    # normal: {}
-    # insert: {}
-    # hint: {}
-    # passthrough: {}
-    # command: {}
-    # prompt: {}
-    # caret: {}
-    # register: {}
   type:
     name: Dict
     none_ok: true
@@ -2105,7 +2097,9 @@ bindings.commands:
     valtype:
       name: Dict
       keytype: Key
-      valtype: Command
+      valtype:
+        name: Command
+        none_ok: true
   desc: >-
     Keybindings mapping keys to commands in different modes.
 
@@ -2132,7 +2126,9 @@ bindings.commands:
     with Shift. For special keys (with `<>`-signs), you need to explicitly add
     `Shift-` to match a key pressed with shift.
 
-    To completely unbind a default binding, bind it to the `nop` command.
+    If you want a binding to do nothing, bind it to the `nop` command.
+    If you want a default binding to be passed through to the website, bind it
+    to null.
 
     Note that some commands which are only useful for bindings (but not used
     interactively) are hidden from the command completion. See `:help` for a

qutebrowser/config/configtypes.py

@@ -729,7 +729,7 @@ class Command(BaseType):
     def to_py(self, value):
         self._basic_py_validation(value, str)
         if not value:
-            return
+            return None
 
         # FIXME:conf is it okay to import runners.py here?
         from qutebrowser.commands import runners, cmdexc
@@ -1034,10 +1034,31 @@ class Dict(BaseType):
             raise configexc.ValidationError(
                 value, "Expected keys {}".format(self.fixed_keys))
 
+    def _none_value(self, value=None):
+        """Return the value to be used when the setting is None.
+
+        Args:
+            value: An existing value to be mutated when given.
+        """
+        if self.fixed_keys is None:
+            if value is None:
+                return {}
+            else:
+                assert value == {}, value
+                return value
+        else:
+            if value is None:
+                return {key: {} for key in self.fixed_keys}
+            else:
+                assert value == {}, value
+                for key in self.fixed_keys:
+                    value[key] = {}
+                return value
+
     def from_str(self, value):
         self._basic_str_validation(value)
         if not value:
-            return None
+            return self._none_value()
 
         try:
             yaml_val = utils.yaml_load(value)
@@ -1052,7 +1073,7 @@ class Dict(BaseType):
     def to_py(self, value):
         self._basic_py_validation(value, dict)
         if not value:
-            return None
+            return self._none_value(value)
 
         self._validate_keys(value)
 
@@ -1280,6 +1301,9 @@ class Padding(Dict):
                          fixed_keys=['top', 'bottom', 'left', 'right'],
                          none_ok=none_ok)
 
+    def _none_value(self, _value=None):
+        return None
+
     def to_py(self, value):
         d = super().to_py(value)
         if not d:

tests/unit/config/test_configtypes.py

@@ -252,8 +252,12 @@ class TestAll:
     def test_none_ok_true(self, klass):
         """Test None and empty string values with none_ok=True."""
         typ = klass(none_ok=True)
-        assert typ.from_str('') is None
+        if isinstance(typ, configtypes.Dict):
-        assert typ.to_py(None) is None
+            expected = typ._none_value()
+        else:
+            expected = None
+        assert typ.from_str('') == expected
+        assert typ.to_py(None) == expected
         assert typ.to_str(None) == ''
 
     @pytest.mark.parametrize('method, value', [