Add a raise_cmdexc_if_invalid to urlutils.

qutebrowser/browser/commands.py

@@ -109,11 +109,7 @@ class CommandDispatcher:
             background: Whether to open in the background.
             window: Whether to open in a new window
         """
-        if not url.isValid():
-            errstr = "Invalid URL {}"
-            if url.errorString():
-                errstr += " - {}".format(url.errorString())
-            raise cmdexc.CommandError(errstr)
+        urlutils.raise_cmdexc_if_invalid(url)
         tabbed_browser = self._tabbed_browser()
         cmdutils.check_exclusive((tab, background, window), 'tbw')
         if window:

qutebrowser/utils/urlutils.py

@@ -29,6 +29,7 @@ from PyQt5.QtNetwork import QHostInfo
 
 from qutebrowser.config import config
 from qutebrowser.utils import log, qtutils, message
+from qutebrowser.commands import cmdexc
 
 
 # FIXME: we probably could raise some exceptions on invalid URLs
@@ -272,6 +273,16 @@ def invalid_url_error(win_id, url, action):
     message.error(win_id, errstring)
 
 
+def raise_cmdexc_if_invalid(url):
+    """Check if the given QUrl is invalid, and if so, raise a CommandError."""
+    if not url.isValid():
+        errstr = "Invalid URL {}".format(url.toDisplayString())
+        url_error = url.errorString()
+        if url_error:
+            errstr += " - {}".format(url_error)
+        raise cmdexc.CommandError(errstr)
+
+
 class FuzzyUrlError(Exception):
 
     """Exception raised by fuzzy_url on problems."""