Show exception stack when handling cmdexc errors.

qutebrowser/commands/command.py

@@ -21,6 +21,7 @@
 
 import inspect
 import collections
+import traceback
 
 from PyQt5.QtWebKit import QWebSettings
 
@@ -493,7 +494,8 @@ class Command:
         try:
             self.namespace = self.parser.parse_args(args)
         except argparser.ArgumentParserError as e:
-            message.error(win_id, '{}: {}'.format(self.name, e))
+            message.error(win_id, '{}: {}'.format(self.name, e),
+                          stack=traceback.format_exc())
             return
         except argparser.ArgumentParserExit as e:
             log.commands.debug("argparser exited with status {}: {}".format(

qutebrowser/commands/runners.py

@@ -20,6 +20,7 @@
 """Module containing command managers (SearchRunner and CommandRunner)."""
 
 import collections
+import traceback
 
 from PyQt5.QtCore import pyqtSlot, QUrl, QObject
 
@@ -264,7 +265,8 @@ class CommandRunner(QObject):
         try:
             self.run(text, count)
         except (cmdexc.CommandMetaError, cmdexc.CommandError) as e:
-            message.error(self._win_id, e, immediately=True)
+            message.error(self._win_id, e, immediately=True,
+                          stack=traceback.format_exc())
 
     @pyqtSlot(str, int)
     def run_safely_init(self, text, count=None):
@@ -276,4 +278,4 @@ class CommandRunner(QObject):
         try:
             self.run(text, count)
         except (cmdexc.CommandMetaError, cmdexc.CommandError) as e:
-            message.error(self._win_id, e)
+            message.error(self._win_id, e, stack=traceback.format_exc())

qutebrowser/keyinput/keyparser.py

@@ -19,6 +19,8 @@
 
 """Advanced keyparsers."""
 
+import traceback
+
 from qutebrowser.keyinput.basekeyparser import BaseKeyParser
 from qutebrowser.utils import message, utils
 from qutebrowser.commands import runners, cmdexc
@@ -41,7 +43,8 @@ class CommandKeyParser(BaseKeyParser):
         try:
             self._commandrunner.run(cmdstr, count)
         except (cmdexc.CommandMetaError, cmdexc.CommandError) as e:
-            message.error(self._win_id, e, immediately=True)
+            message.error(self._win_id, e, immediately=True,
+                          stack=traceback.format_exc())
 
 
 class PassthroughKeyParser(CommandKeyParser):

qutebrowser/utils/message.py

@@ -116,14 +116,16 @@ def on_focus_changed():
         getattr(bridge, msg.method_name)(text, *msg.args, **msg.kwargs)
 
 
-def error(win_id, message, immediately=False):
+def error(win_id, message, immediately=False, *, stack=None):
     """Convenience function to display an error message in the statusbar.
 
     Args:
         win_id: The ID of the window which is calling this function.
         others: See MessageBridge.error.
+        stack: The stack trace to show.
     """
-    stack = ''.join(traceback.format_stack())
+    if stack is None:
+        stack = ''.join(traceback.format_stack())
     log.message.debug("Error message stack:\n{}".format(stack))
     _wrapper(win_id, 'error', message, immediately)