Add an error dialog and use it to show plugin load/unload errors.

Will be used later for errors in plugin execution and general errors from signal handlers and etc.

"Copy to PasteBin" still not implemented.

src/mcedit2/dialogs/error_dialog.py

@@ -0,0 +1,54 @@
+"""
+    error_dialog
+"""
+from __future__ import absolute_import, division, print_function, unicode_literals
+import logging
+import traceback
+import sys
+import platform
+
+from PySide import QtGui
+from mcedit2.util import qglcontext
+
+from mcedit2.util.load_ui import load_ui
+
+log = logging.getLogger(__name__)
+
+def showErrorDialog(text, tb, fatal):
+    dialog = ErrorDialog(text, tb, fatal)
+    dialog.exec_()
+
+class ErrorDialog(QtGui.QDialog):
+    """
+    A dialog for displaying an error traceback when something goes wrong.
+
+    Used to report compile and run errors for plugin modules and classes, and might be
+    used to report errors in MCEdit itself during signal or event handlers.
+    """
+    def __init__(self, text, exc_info, fatal):
+        super(ErrorDialog, self).__init__()
+        load_ui("error_dialog.ui", baseinstance=self)
+
+        exc_type, exc_value, exc_tb = exc_info
+
+        self.errorDescriptionLabel.setText(text)
+        tbText = "".join(traceback.format_exception(exc_type, exc_value, exc_tb))
+
+        contextInfo = qglcontext.getContextInfo() or ""
+
+        from mcedit2 import __version__
+        tbText = "MCEdit version: %s\n" \
+                 "Python version: %s\n" \
+                 "Platform: %s\n" \
+                 "System version: %s\n" \
+                 "Processor: %s\n" \
+                 "\n" \
+                 "%s\n" \
+                 "------\n\n" \
+                 "%s" % (__version__, sys.version, sys.platform,
+                         platform.platform(), platform.processor(),
+                         contextInfo, tbText)
+        self.tracebackView.setText(tbText)
+
+        self.restartMCEditLabel.setVisible(fatal)
+

src/mcedit2/dialogs/plugins_dialog.py

@@ -6,6 +6,7 @@ import logging
 from PySide import QtGui, QtCore
 from PySide.QtCore import Qt
 from mcedit2 import plugins
+from mcedit2.dialogs.error_dialog import showErrorDialog
 from mcedit2.util.load_ui import load_ui
 from mcedit2.util.resources import resourcePath
 
@@ -77,9 +78,13 @@ class PluginsTableModel(QtCore.QAbstractTableModel):
         pluginRef.enabled = value
 
         if value:
-            pluginRef.load()
+            if not pluginRef.load():
+                showErrorDialog("%s while loading plugin \"%s\"" % (pluginRef.loadError[0].__name__, pluginRef.displayName), pluginRef.loadError, False)
+
         else:
-            pluginRef.unload()
+            if not pluginRef.unload():
+                showErrorDialog("%s while unloading plugin \"%s\"" % (pluginRef.unloadError[0].__name__, pluginRef.displayName), pluginRef.unloadError, False)
+
 
         self.dataChanged.emit(index, index)
 

src/mcedit2/editorapp.py

@@ -12,6 +12,7 @@ import numpy
 import sys
 from mcedit2 import plugins
 from mcedit2.appsettings import RecentFilesSetting, EnableLightingSetting, DevModeSetting
+from mcedit2.dialogs.error_dialog import showErrorDialog
 from mcedit2.dialogs.plugins_dialog import PluginsDialog
 from mcedit2.library import LibraryWidget
 
@@ -339,7 +340,8 @@ class MCEditApp(QtGui.QApplication):
 
         for pluginRef in plugins.getAllPlugins():
             if pluginRef.enabled:
-                pluginRef.load()
+                if not pluginRef.load():
+                    showErrorDialog("%s while loading plugin \"%s\"" % (pluginRef.loadError[0].__name__, pluginRef.displayName), pluginRef.loadError, False)
 
         log.info("Opening worlds from command line.")
 
@@ -956,5 +958,7 @@ class MCEditApp(QtGui.QApplication):
         for pluginRef in plugins.getAllPlugins():
             if pluginRef.checkTimestamps():
                 log.info("Plugin %s changed. Reloading plugin module...", pluginRef.displayName)
-                pluginRef.unload()
+                if not pluginRef.unload():
-                pluginRef.load()
+                    showErrorDialog("%s while unloading plugin \"%s\"" % (pluginRef.unloadError[0].__name__, pluginRef.displayName), pluginRef.unloadError, False)
+                    if not pluginRef.load():
+                        showErrorDialog("%s while loading plugin \"%s\"" % (pluginRef.loadError[0].__name__, pluginRef.displayName), pluginRef.loadError, False)

src/mcedit2/plugins.py

@@ -121,14 +121,17 @@ class PluginRef(object):
 
             log.info("Loaded %s (%s)", self.filename, self.displayName)
         except Exception as e:
-            self.loadError = traceback.format_exc()
+            self.loadError = sys.exc_info()
             log.exception("Error while loading plugin from %s: %r", self.filename, e)
+            return False
         else:
             self.loadError = None
         finally:
             if io:
                 io.close()
 
+        return True
+
     def unload(self):
         if self.pluginModule is None:
             return
@@ -139,12 +142,14 @@ class PluginRef(object):
                     sys.modules.pop(k)
                     break
         except Exception as e:
-            self.unloadError = traceback.format_exc()
+            self.loadError = sys.exc_info()
             log.exception("Error while unloading plugin from %s: %r", self.filename, e)
+            return False
         else:
             self.unloadError = None
 
         self.pluginModule = None
+        return True
 
     @property
     def isLoaded(self):

src/mcedit2/ui/error_dialog.ui

@@ -0,0 +1,136 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>Dialog</class>
+ <widget class="QDialog" name="Dialog">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>690</width>
+    <height>550</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>MCEdit Error</string>
+  </property>
+  <layout class="QVBoxLayout" name="verticalLayout">
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout_2">
+     <item>
+      <widget class="QLabel" name="label">
+       <property name="text">
+        <string>&lt;html&gt;&lt;head/&gt;&lt;body&gt;&lt;p&gt;&lt;span style=&quot; font-size:12pt;&quot;&gt;An Error Has Occurred:&lt;/span&gt;&lt;/p&gt;&lt;/body&gt;&lt;/html&gt;</string>
+       </property>
+       <property name="textFormat">
+        <enum>Qt::RichText</enum>
+       </property>
+       <property name="scaledContents">
+        <bool>false</bool>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QLabel" name="errorDescriptionLabel">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+         <horstretch>1</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="text">
+        <string>(no error yet!)</string>
+       </property>
+       <property name="alignment">
+        <set>Qt::AlignBottom|Qt::AlignLeading|Qt::AlignLeft</set>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+   <item>
+    <widget class="QLabel" name="restartMCEditLabel">
+     <property name="text">
+      <string>It is recommended to undo the last command, save your work, and restart MCEdit.</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QLabel" name="label_3">
+     <property name="text">
+      <string>Error Details:</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QTextBrowser" name="tracebackView"/>
+   </item>
+   <item>
+    <widget class="QLabel" name="label_4">
+     <property name="text">
+      <string>Send this error report to the plugin or application developer to help get it fixed. </string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <widget class="QLabel" name="label_5">
+     <property name="text">
+      <string>Clicking &quot;Copy to PasteBin&quot; will copy a Pastebin URL to your clipboard.</string>
+     </property>
+    </widget>
+   </item>
+   <item>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <spacer name="horizontalSpacer">
+       <property name="orientation">
+        <enum>Qt::Horizontal</enum>
+       </property>
+       <property name="sizeHint" stdset="0">
+        <size>
+         <width>40</width>
+         <height>20</height>
+        </size>
+       </property>
+      </spacer>
+     </item>
+     <item>
+      <widget class="QPushButton" name="copyToPastebinButton">
+       <property name="text">
+        <string>Copy to PasteBin</string>
+       </property>
+      </widget>
+     </item>
+     <item>
+      <widget class="QPushButton" name="continueButton">
+       <property name="text">
+        <string>Continue</string>
+       </property>
+       <property name="default">
+        <bool>true</bool>
+       </property>
+      </widget>
+     </item>
+    </layout>
+   </item>
+  </layout>
+ </widget>
+ <resources/>
+ <connections>
+  <connection>
+   <sender>continueButton</sender>
+   <signal>clicked()</signal>
+   <receiver>Dialog</receiver>
+   <slot>accept()</slot>
+   <hints>
+    <hint type="sourcelabel">
+     <x>650</x>
+     <y>523</y>
+    </hint>
+    <hint type="destinationlabel">
+     <x>505</x>
+     <y>5</y>
+    </hint>
+   </hints>
+  </connection>
+ </connections>
+</ui>

src/mcedit2/util/qglcontext.py

@@ -9,6 +9,11 @@ import re
 
 log = logging.getLogger(__name__)
 
+_lastAcquiredContextInfo = None
+
+def getContextInfo():
+    return _lastAcquiredContextInfo
+
 def setDefaultFormat():
     oglFormat = QtOpenGL.QGLFormat()
     oglFormat.setVersion(1, 3)
@@ -17,6 +22,7 @@ def setDefaultFormat():
 
 def validateQGLContext(context):
     context.makeCurrent()
+
     versionFlags = QtOpenGL.QGLFormat.openGLVersionFlags()
     log.info("OpenGL Version Info:")
     for flag in (
@@ -61,6 +67,8 @@ def validateQGLContext(context):
     detailedText += "GL_RENDERER: %s\n" % GL.glGetString(GL.GL_RENDERER)
 
     log.info("%s", detailedText)
+    global _lastAcquiredContextInfo
+    _lastAcquiredContextInfo = detailedText
 
     if (not context.isValid() or not actualFormat.directRendering()
         or not versionFlags & QtOpenGL.QGLFormat.OpenGL_Version_1_3