Conditional import of QtWebEngine or QtWebKit

manuskript/main.py

@@ -4,6 +4,7 @@ import faulthandler
 import os
 import sys
 
+import manuskript.ui.views.webView
 from PyQt5.QtCore import QLocale, QTranslator, QSettings
 from PyQt5.QtGui import QIcon
 from PyQt5.QtWidgets import QApplication, qApp

manuskript/ui/views/webView.py

@@ -1,22 +1,37 @@
 #!/usr/bin/env python
 # --!-- coding: utf8 --!--
-from PyQt5.QtWidgets import QTextEdit
+import PyQt5
+import os
 
-try:
+features = {'qtwebkit': False, 'qtwebengine': False}
+
+if 'QT_WEB' in os.environ:
+    features[os.environ['QT_WEB']] = True
+else:
+    try:
+        import PyQt5.QtWebKitWidgets
+        features['qtwebkit'] = True
+    except:
+        features['qtwebkit'] = False
+
+    try:
+        import PyQt5.QtWebEngineWidgets
+        features['qtwebengine'] = True
+    except:
+        features['qtwebengine'] = False
+
+if features['qtwebkit']:
     from PyQt5.QtWebKitWidgets import QWebView
     print("Debug: Web rendering engine used: QWebView")
     webEngine = "QtWebKit"
     webView = QWebView
-
+elif features['qtwebengine']:
-except:
+    from PyQt5 import QtWebEngineWidgets
-
+    print("Debug: Web rendering engine used: QWebEngineView")
-    try:
+    webEngine = "QtWebEngine"
-        from PyQt5.QtWebEngineWidgets import QWebEngineView
+    webView = QtWebEngineWidgets.QWebEngineView
-        print("Debug: Web rendering engine used: QWebEngineView")
+else:
-        webEngine = "QtWebEngine"
+    from PyQt5.QtWidgets import QTextEdit
-        webView = QWebEngineView
+    print("Debug: Web rendering engine used: QTextEdit")
-
+    webEngine = "QTextEdit"
-    except:
+    webView = QTextEdit
-        print("Debug: Web rendering engine used: QTextEdit")
-        webEngine = "QTextEdit"
-        webView = QTextEdit