Added error.py file for error handling functions

nw/error.py

@@ -0,0 +1,89 @@
+# -*- coding: utf-8 -*-
+"""novelWriter Init
+
+ novelWriter – Exception Handling
+==================================
+ Error handling functions
+
+ File History:
+ Created: 2020-08-02 [0.10.2]
+
+ This file is a part of novelWriter
+ Copyright 2020, Veronica Berglyd Olsen
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful, but
+ WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>.
+"""
+
+def formatHtmlErrMsg(exType, exValue, exTrace):
+    """Generates a HTML version of an exception.
+    """
+    try:
+        from traceback import format_tb
+        from nw import __issuesurl__
+
+        fmtTrace = ""
+        for trEntry in format_tb(exTrace):
+            for trLine in trEntry.split("\n"):
+                stripLine = trLine.lstrip(" ")
+                nIndent = len(trLine) - len(stripLine)
+                fmtTrace += "&nbsp;"*nIndent + stripLine + "<br>"
+
+        theMessage = (
+            "<p>Please report this error by submitting an issue report on "
+            "GitHub, providing a description and this error message.</p>"
+            "<p><b>Issue Tracker</b><br>%s</p>"
+            "<p><b>Error Type</b><br>%s: %s</p>"
+            "<p><b>Traceback</b><br>%s</p>"
+        ) % (__issuesurl__, exType.__name__, str(exValue), fmtTrace)
+
+        return theMessage
+
+    except Exception as e:
+        return "Could not generate error message.<br>%s" % str(e)
+
+    return "Could not generate error message."
+
+
+def exceptionHandler(exType, exValue, exTrace):
+    """Function to catch unhandled global exceptions.
+    """
+    import logging
+    from traceback import print_tb, format_tb
+    from nw import __issuesurl__
+    from PyQt5.QtWidgets import qApp, QApplication, QErrorMessage, QMessageBox
+
+    logger = logging.getLogger(__name__)
+    logger.error("%s: %s" % (exType.__name__, str(exValue)))
+    print_tb(exTrace)
+
+    try:
+        nwGUI = None
+        for qWin in qApp.topLevelWidgets():
+            if qWin.objectName() == "GuiMain":
+                nwGUI = qWin
+                break
+
+        if nwGUI is None:
+            logger.warning("Could not find main GUI window so cannot open error dialog")
+            return
+
+        errMsg = QErrorMessage(nwGUI)
+        errMsg.setWindowTitle("Unhandled Error")
+        errMsg.resize(800, 400)
+        errMsg.showMessage((
+            "<h3>An unhandled error has been encountered</h3>%s"
+        ) % formatHtmlErrMsg(exType, exValue, exTrace))
+
+    except Exception as e:
+        logger.error(str(e))