Remove fallback values from config

qutebrowser/commands/parsers.py

@@ -64,9 +64,9 @@ class SearchParser(QObject):
             self.do_search.emit('', 0)
         self._text = text
         self._flags = 0
-        if config.config.get('general', 'ignorecase', fallback=True):
+        if config.config.get('general', 'ignorecase'):
             self._flags |= QWebPage.FindCaseSensitively
-        if config.config.get('general', 'wrapsearch', fallback=True):
+        if config.config.get('general', 'wrapsearch'):
             self._flags |= QWebPage.FindWrapsAroundDocument
         if rev:
             self._flags |= QWebPage.FindBackward

qutebrowser/config/config.py

@@ -39,9 +39,6 @@ from qutebrowser.config.conftypes import ValidationError
 config = None
 state = None
 
-# Special value for an unset fallback, so None can be passed as fallback.
-_UNSET = object()
-
 
 class NoSectionError(configparser.NoSectionError):
 
@@ -225,30 +222,23 @@ class Config:
         val = self.get(section, option)
         message.info("{} {} = {}".format(section, option, val))
 
-    def get(self, section, option, fallback=_UNSET, raw=False):
+    def get(self, section, option, raw=False):
         """Get the value from a section/option.
 
         Arguments:
             section: The section to get the option from.
             option: The option name
-            fallback: A fallback value.
             raw: Whether to get the uninterpolated, untransformed value.
         """
         logging.debug("getting {} -> {}".format(section, option))
         try:
             sect = self.config[section]
         except KeyError:
-            if fallback is _UNSET:
             raise NoSectionError(section)
-            else:
-                return fallback
         try:
             val = sect[option]
         except KeyError:
-            if fallback is _UNSET:
             raise NoOptionError(option, section)
-            else:
-                return fallback
         if raw:
             return val.value
         mapping = {key: val.value for key, val in sect.values.items()}
@@ -409,15 +399,18 @@ class SectionProxy(MutableMapping):
         """Get the option keys from this section."""
         return self._conf.config[self._name].values.keys()
 
-    def get(self, option, fallback=_UNSET, *, raw=False):
+    def get(self, option, *, raw=False):
         """Get a value from this section.
 
+        We deliberately don't support the default argument here, but have a raw
+        argument instead.
+
         Arguments:
             option: The option name to get.
-            fallback: A fallback value.
             raw: Whether to get a raw value or not.
         """
-        return self._conf.get(self._name, option, raw=raw, fallback=fallback)
+        # pylint: disable=arguments-differ
+        return self._conf.get(self._name, option, raw=raw)
 
     @property
     def conf(self):

qutebrowser/utils/url.py

@@ -27,6 +27,13 @@ from PyQt5.QtCore import QUrl
 import qutebrowser.config.config as config
 
 
+class SearchEngineError(Exception):
+
+    """Exception raised when a search engine wasn't found."""
+
+    pass
+
+
 def _get_search_url(txt):
     """Get a search engine URL for a text.
 
@@ -37,26 +44,26 @@ def _get_search_url(txt):
         The search URL as a QUrl.
 
     Raise:
-        ValueError if there is no template or no search term was found.
+        SearchEngineError if there is no template or no search term was found.
     """
     logging.debug('Finding search engine for "{}"'.format(txt))
     r = re.compile(r'(^|\s+)!(\w+)($|\s+)')
     m = r.search(txt)
     if m:
         engine = m.group(2)
-        # FIXME why doesn't fallback work?!
-        template = config.config.get('searchengines', engine, fallback=None)
+        try:
+            template = config.config.get('searchengines', engine)
+        except config.NoOptionError:
+            raise SearchEngineError("Search engine {} not found!".format(
+                engine))
         term = r.sub('', txt)
         logging.debug('engine {}, term "{}"'.format(engine, term))
     else:
-        template = config.config.get('searchengines', 'DEFAULT',
-                                     fallback=None)
+        template = config.config.get('searchengines', 'DEFAULT')
         term = txt
         logging.debug('engine: default, term "{}"'.format(txt))
-    if template is None:
-        raise ValueError("Search template is None")
     if not term:
-        raise ValueError("No search term given")
+        raise SearchEngineError("No search term given")
     return QUrl.fromUserInput(template.format(urllib.parse.quote(term)))
 
 

qutebrowser/widgets/browsertab.py

@@ -26,6 +26,7 @@ from PyQt5.QtWebKitWidgets import QWebView, QWebPage
 
 import qutebrowser.utils.url as urlutils
 import qutebrowser.config.config as config
+import qutebrowser.utils.message as message
 from qutebrowser.widgets.browserpage import BrowserPage
 from qutebrowser.utils.signals import SignalCache
 from qutebrowser.utils.usertypes import NeighborList
@@ -93,7 +94,11 @@ class BrowserTab(QWebView):
         Emit:
             titleChanged and urlChanged
         """
+        try:
             u = urlutils.fuzzy_url(url)
+        except urlutils.SearchEngineError as e:
+            message.error(str(e))
+            return
         logging.debug('New title: {}'.format(urlutils.urlstring(u)))
         self.titleChanged.emit(urlutils.urlstring(u))
         self.urlChanged.emit(urlutils.qurl(u))