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avoid on duplicate user functions (fixes #13579)

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This commit is contained in:
Juergen E. Fischer 2015-10-18 00:20:07 +02:00
parent 6496bc4955
commit cc9c789760
2 changed files with 6 additions and 2 deletions
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6
python/core/__init__.py
View File

@ -1,6 +1,7 @@
import inspect
import string
from qgis._core import *
from PyQt4.QtCore import QCoreApplication
def register_function(function, arg_count, group, usesgeometry=False, **kwargs):
@ -66,7 +67,10 @@ def register_function(function, arg_count, group, usesgeometry=False, **kwargs):
register = kwargs.get('register', True)
if register and QgsExpression.isFunctionName(name):
if not QgsExpression.unregisterFunction(name):
raise TypeError("Unable to unregister function")
msgtitle = QCoreApplication.translate("UserExpressions", "User expressions")
msg = QCoreApplication.translate("UserExpressions", "The user expression {0} already exists and could not be unregistered.").format(name)
QgsMessageLog.logMessage(msg + "\n", msgtitle, QgsMessageLog.WARNING)
return None
function.__name__ = name
helptext = helptemplate.safe_substitute(name=name, doc=helptext)

2
python/user.py
View File

@ -68,5 +68,5 @@ try:
except ImportError:
# We get a import error and crash for some reason even if we make the expressions package
# TODO Fix the crash on first load with no expressions folder
# But for now it's not the end of the world if it doesn't laod the first time
# But for now it's not the end of the world if it doesn't load the first time
pass