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[user expression] Fix crash and add a log message when the expression…
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… is not valid, fixes #12852
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slarosa committed May 30, 2015
1 parent 51bd0b2 commit f7401c9
Showing 1 changed file with 12 additions and 3 deletions.
15 changes: 12 additions & 3 deletions python/
@@ -1,8 +1,10 @@
import os
import sys
import glob
import traceback

from qgis.core import QgsApplication
from PyQt4.QtCore import QCoreApplication
from qgis.core import QgsApplication, QgsMessageLog

def load_user_expressions(path):
Expand All @@ -14,9 +16,16 @@ def load_user_expressions(path):
for name in names:
if name == "__init__":
# As user expression functions should be registed with qgsfunction
# As user expression functions should be registered with qgsfunction
# just importing the file is enough to get it to load the functions into QGIS
__import__("expressions.{0}".format(name), locals(), globals())
__import__("expressions.{0}".format(name), locals(), globals())
error = traceback.format_exc()
msgtitle = QCoreApplication.translate("UserExpressions", "User expressions")
msg = QCoreApplication.translate("UserExpressions",
"The user expression {0} is not valid".format(name))
QgsMessageLog.logMessage(msg +"\n"+ error, msgtitle, QgsMessageLog.WARNING)

userpythonhome = os.path.join(QgsApplication.qgisSettingsDirPath(), "python")
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