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373e591a80
User script should be placed into $HOME/.local/share/QGIS. Additionally global scripts from /usr/local/share and /usr/share will be loaded if present
93 lines
3.2 KiB
Python
93 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
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"""
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***************************************************************************
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user.py
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---------------------
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Date : January 2015
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Copyright : (C) 2015 by Nathan Woodrow
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Email : woodrow dot nathan at gmail dot com
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***************************************************************************
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* *
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* This program is free software; you can redistribute it and/or modify *
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* it under the terms of the GNU General Public License as published by *
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* the Free Software Foundation; either version 2 of the License, or *
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* (at your option) any later version. *
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* *
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***************************************************************************
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"""
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__author__ = 'Nathan Woodrow'
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__date__ = 'January 2015'
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__copyright__ = '(C) 2015, Nathan Woodrow'
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# This will get replaced with a git SHA1 when you do a git archive
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__revision__ = '$Format:%H$'
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import os
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import sys
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import glob
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import traceback
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from qgis.PyQt.QtCore import QCoreApplication
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from qgis.core import QgsApplication, QgsMessageLog
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def load_user_expressions(path):
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"""
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Load all user expressions from the given paths
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"""
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#Loop all py files and import them
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modules = glob.glob(path + "/*.py")
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names = [os.path.basename(f)[:-3] for f in modules]
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for name in names:
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if name == "__init__":
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continue
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# As user expression functions should be registered with qgsfunction
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# just importing the file is enough to get it to load the functions into QGIS
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try:
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__import__("expressions.{0}".format(name), locals(), globals())
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except:
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error = traceback.format_exc()
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msgtitle = QCoreApplication.translate("UserExpressions", "User expressions")
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msg = QCoreApplication.translate("UserExpressions", "The user expression {0} is not valid").format(name)
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QgsMessageLog.logMessage(msg + "\n" + error, msgtitle, QgsMessageLog.WARNING)
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userpythonhome = os.path.join(QgsApplication.qgisSettingsDirPath(), "python")
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expressionspath = os.path.join(userpythonhome, "expressions")
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sys.path.append(userpythonhome)
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if not os.path.exists(expressionspath):
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os.makedirs(expressionspath)
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initfile = os.path.join(expressionspath, "__init__.py")
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if not os.path.exists(initfile):
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open(initfile, "w").close()
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template = """\"\"\"
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Define new functions using @qgsfunction. feature and parent must always be the
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last args. Use args=-1 to pass a list of values as arguments
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\"\"\"
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from qgis.core import *
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from qgis.gui import *
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@qgsfunction(args='auto', group='Custom')
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def func(value1, feature, parent):
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return value1
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"""
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try:
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import expressions
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expressions.load = load_user_expressions
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expressions.load(expressionspath)
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expressions.template = template
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except ImportError:
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# We get a import error and crash for some reason even if we make the expressions package
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# TODO Fix the crash on first load with no expressions folder
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# But for now it's not the end of the world if it doesn't load the first time
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pass
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