Measure time it takes to init URL completion.

qutebrowser/completion/models/instances.py

@@ -32,7 +32,7 @@ from PyQt5.QtCore import pyqtSlot, Qt
 from qutebrowser.completion.models import miscmodels, urlmodel, configmodel
 from qutebrowser.completion.models.sortfilter import (
     CompletionFilterModel as CFM)
-from qutebrowser.utils import objreg, usertypes, log
+from qutebrowser.utils import objreg, usertypes, log, debug
 from qutebrowser.config import configdata
 
 
@@ -56,8 +56,9 @@ def _init_helptopic_completion():
 def _init_url_completion():
     """Initialize the URL completion model."""
     log.completion.debug("Initializing URL completion.")
-    _instances[usertypes.Completion.url] = CFM(
+    with debug.log_time(log.completion, 'URL completion init'):
-        urlmodel.UrlCompletionModel(), dumb_sort=Qt.DescendingOrder)
+        _instances[usertypes.Completion.url] = CFM(
+            urlmodel.UrlCompletionModel(), dumb_sort=Qt.DescendingOrder)
 
 
 def _init_setting_completions():

qutebrowser/completion/models/sortfilter.py

@@ -25,7 +25,7 @@ Contains:
 
 from PyQt5.QtCore import QSortFilterProxyModel, QModelIndex, Qt
 
-from qutebrowser.utils import log, qtutils
+from qutebrowser.utils import log, qtutils, debug
 from qutebrowser.completion.models import base as completion
 
 

qutebrowser/utils/debug.py

@@ -23,6 +23,8 @@ import re
 import sys
 import inspect
 import functools
+import datetime
+import contextlib
 
 from PyQt5.QtCore import QEvent, QMetaMethod
 
@@ -248,3 +250,12 @@ def format_call(func, args=None, kwargs=None, full=True):
     else:
         name = func.__name__
     return '{}({})'.format(name, _format_args(args, kwargs))
+
+
+@contextlib.contextmanager
+def log_time(logger, action='operation'):
+    started = datetime.datetime.now()
+    yield
+    finished = datetime.datetime.now()
+    delta = (finished - started).total_seconds()
+    logger.debug("{} took {} seconds.".format(action.capitalize(), delta))