Add a --pdb-postmortem argument.

doc/qutebrowser.1.asciidoc

@@ -80,6 +80,9 @@ It was inspired by other browsers/addons like dwb and Vimperator/Pentadactyl.
 *--no-crash-dialog*::
     Don't show a crash dialog.
 
+*--pdb-postmortem*::
+    Drop into pdb on exceptions.
+
 *--qt-name* 'NAME'::
     Set the window name.
 

qutebrowser/app.py

@@ -24,6 +24,7 @@ import sys
 import subprocess
 import configparser
 import signal
+import pdb
 import bdb
 import base64
 import functools
@@ -596,7 +597,11 @@ class Application(QApplication):
         is_ignored_exception = (exctype is bdb.BdbQuit or
                                 not issubclass(exctype, Exception))
 
-        if is_ignored_exception or self._args.no_crash_dialog:
+        if self._args.pdb_postmortem:
+            pdb.post_mortem(tb)
+
+        if (is_ignored_exception or self._args.no_crash_dialog or
+                self._args.pdb_postmortem):
             # pdb exit, KeyboardInterrupt, ...
             status = 0 if is_ignored_exception else 2
             try:

qutebrowser/qutebrowser.py

@@ -84,6 +84,8 @@ def get_argparser():
                        action='store_true')
     debug.add_argument('--no-crash-dialog', action='store_true', help="Don't "
                        "show a crash dialog.")
+    debug.add_argument('--pdb-postmortem', action='store_true',
+                       help="Drop into pdb on exceptions.")
     # For the Qt args, we use store_const with const=True rather than
     # store_true because we want the default to be None, to make
     # utils.qt:get_args easier.