Add a --relaxed-config options.

doc/qutebrowser.1.asciidoc

@@ -65,6 +65,9 @@ It was inspired by other browsers/addons like dwb and Vimperator/Pentadactyl.
 *--harfbuzz* '{old,new,system,auto}'::
     HarfBuzz engine version to use. Default: auto.
 
+*--relaxed-config*::
+    Silently remove unknown config options.
+
 *--nowindow*::
     Don't show the main window.
 

qutebrowser/config/config.py

@@ -117,8 +117,9 @@ def _init_main_config():
     """Initialize the main config."""
     try:
         app = objreg.get('app')
+        args = objreg.get('args')
         config_obj = ConfigManager(standarddir.config(), 'qutebrowser.conf',
-                                   app)
+                                   args.relaxed_config, app)
     except (configexc.Error, configparser.Error, UnicodeDecodeError) as e:
         log.init.exception(e)
         errstr = "Error while reading config:"
@@ -270,7 +271,7 @@ class ConfigManager(QObject):
     changed = pyqtSignal(str, str)
     style_changed = pyqtSignal(str, str)
 
-    def __init__(self, configdir, fname, parent=None):
+    def __init__(self, configdir, fname, relaxed=False, parent=None):
         super().__init__(parent)
         self._initialized = False
         self.sections = configdata.DATA
@@ -285,7 +286,7 @@ class ConfigManager(QObject):
         else:
             self._configdir = configdir
             parser = ini.ReadConfigParser(configdir, fname)
-            self._from_cp(parser)
+            self._from_cp(parser, relaxed)
             self._initialized = True
             self._validate_all()
 
@@ -394,17 +395,19 @@ class ConfigManager(QObject):
         else:
             return None
 
-    def _from_cp(self, cp):
+    def _from_cp(self, cp, relaxed=False):
         """Read the config from a configparser instance.
 
         Args:
             cp: The configparser instance to read the values from.
+            relaxed: Whether to ignore inexistent sections/optons
         """
         for sectname in cp:
             if sectname in self.RENAMED_SECTIONS:
                 sectname = self.RENAMED_SECTIONS[sectname]
             if sectname is not 'DEFAULT' and sectname not in self.sections:
-                raise configexc.NoSectionError(sectname)
+                if not relaxed:
+                    raise configexc.NoSectionError(sectname)
         for sectname in self.sections:
             real_sectname = self._get_real_sectname(cp, sectname)
             if real_sectname is None:
@@ -416,7 +419,13 @@ class ConfigManager(QObject):
                     continue
                 elif (sectname, k) in self.RENAMED_OPTIONS:
                     k = self.RENAMED_OPTIONS[sectname, k]
-                self.set('conf', sectname, k, v, validate=False)
+                try:
+                    self.set('conf', sectname, k, v, validate=False)
+                except configexc.NoOptionError:
+                    if relaxed:
+                        pass
+                    else:
+                        raise
 
     def _validate_all(self):
         """Validate all values set in self._from_cp."""

qutebrowser/qutebrowser.py

@@ -73,6 +73,8 @@ def get_argparser():
     debug.add_argument('--harfbuzz', choices=['old', 'new', 'system', 'auto'],
                        default='auto', help="HarfBuzz engine version to use. "
                        "Default: auto.")
+    debug.add_argument('--relaxed-config', action='store_true',
+                       help="Silently remove unknown config options.")
     debug.add_argument('--nowindow', action='store_true', help="Don't show "
                        "the main window.")
     debug.add_argument('--debug-exit', help="Turn on debugging of late exit.",

qutebrowser/test/config/test_config.py

@@ -27,6 +27,7 @@ import configparser
 import tempfile
 import types
 import shutil
+import argparse
 from unittest import mock
 
 from PyQt5.QtCore import QObject
@@ -143,6 +144,20 @@ class ConfigParserTests(unittest.TestCase):
         with self.assertRaises(configexc.NoOptionError):
             self.cfg._from_cp(self.cp)
 
+    def test_invalid_section_relaxed(self):
+        """Test an invalid section with relaxed=True."""
+        self.cp.read_dict({'foo': {'bar': 'baz'}})
+        self.cfg._from_cp(self.cp, relaxed=True)
+        with self.assertRaises(configexc.NoSectionError):
+            self.cfg.get('foo', 'bar')
+
+    def test_invalid_option_relaxed(self):
+        """Test an invalid option with relaxed=True."""
+        self.cp.read_dict({'general': {'bar': 'baz'}})
+        self.cfg._from_cp(self.cp, relaxed=True)
+        with self.assertRaises(configexc.NoOptionError):
+            self.cfg.get('general', 'bar')
+
 
 class DefaultConfigTests(unittest.TestCase):
 
@@ -173,6 +188,8 @@ class ConfigInitTests(unittest.TestCase):
         }
         objreg.register('app', QObject())
         objreg.register('save-manager', mock.MagicMock())
+        args = argparse.Namespace(relaxed_config=False)
+        objreg.register('args', args)
 
     def tearDown(self):
         shutil.rmtree(self.temp_dir)