Add renderer_process_terminated signal to tab API

qutebrowser/browser/browsertab.py

@@ -74,6 +74,14 @@ class UnsupportedOperationError(WebTabError):
     """Raised when an operation is not supported with the given backend."""
 
 
+TerminationStatus = usertypes.enum('TerminationStatus', [
+    'normal',
+    'abnormal',  # non-zero exit status
+    'crashed',   # e.g. segfault
+    'killed'
+])
+
+
 class TabData:
 
     """A simple namespace with a fixed set of attributes.
@@ -532,6 +540,10 @@ class AbstractTab(QWidget):
         fullscreen_requested: Fullscreen display was requested by the page.
                               arg: True if fullscreen should be turned on,
                                    False if it should be turned off.
+        renderer_process_terminated: Emitted when the underlying renderer process
+                                     terminated.
+                                     arg 0: A TerminationStatus member.
+                                     arg 1: The exit code.
     """
 
     window_close_requested = pyqtSignal()
@@ -548,6 +560,7 @@ class AbstractTab(QWidget):
     contents_size_changed = pyqtSignal(QSizeF)
     add_history_item = pyqtSignal(QUrl, QUrl, str)  # url, requested url, title
     fullscreen_requested = pyqtSignal(bool)
+    renderer_process_terminated = pyqtSignal(TerminationStatus, int)
 
     def __init__(self, win_id, mode_manager, parent=None):
         self.win_id = win_id

qutebrowser/browser/webengine/webenginetab.py

@@ -40,7 +40,7 @@ from qutebrowser.browser.webengine import (webview, webengineelem, tabhistory,
                                            webenginedownloads)
 from qutebrowser.misc import miscwidgets
 from qutebrowser.utils import (usertypes, qtutils, log, javascript, utils,
-                               objreg, jinja, message)
+                               objreg, jinja)
 
 
 _qute_scheme_handler = None
@@ -683,17 +683,17 @@ class WebEngineTab(browsertab.AbstractTab):
             # WORKAROUND for https://bugreports.qt.io/browse/QTBUG-58697
             status = QWebEnginePage.CrashedTerminationStatus
 
-        if status == QWebEnginePage.NormalTerminationStatus:
-            pass
-        elif status == QWebEnginePage.AbnormalTerminationStatus:
-            message.error("Renderer process exited with status {}".format(
-                exitcode))
-        elif status == QWebEnginePage.CrashedTerminationStatus:
-            message.error("Renderer process crashed")
-        elif status == QWebEnginePage.KilledTerminationStatus:
-            message.error("Renderer process was killed")
-        else:
-            raise ValueError("Invalid status {}".format(status))
+        status_map = {
+            QWebEnginePage.NormalTerminationStatus:
+                browsertab.TerminationStatus.normal,
+            QWebEnginePage.AbnormalTerminationStatus:
+                browsertab.TerminationStatus.abnormal,
+            QWebEnginePage.CrashedTerminationStatus:
+                browsertab.TerminationStatus.crashed,
+            QWebEnginePage.KilledTerminationStatus:
+                browsertab.TerminationStatus.killed,
+        }
+        self.renderer_process_terminated.emit(status_map[status], exitcode)
 
     def _connect_signals(self):
         view = self._widget

qutebrowser/mainwindow/tabbedbrowser.py

@@ -198,6 +198,8 @@ class TabbedBrowser(tabwidget.TabWidget):
             functools.partial(self.on_load_started, tab))
         tab.window_close_requested.connect(
             functools.partial(self.on_window_close_requested, tab))
+        tab.renderer_process_terminated.connect(
+            functools.partial(self._on_renderer_process_terminated, tab))
         tab.new_tab_requested.connect(self.tabopen)
         tab.add_history_item.connect(objreg.get('web-history').add_from_tab)
         tab.fullscreen_requested.connect(self.page_fullscreen_requested)
@@ -655,6 +657,20 @@ class TabbedBrowser(tabwidget.TabWidget):
         self.update_window_title()
         self.update_tab_title(idx)
 
+    def _on_renderer_process_terminated(self, tab, status, code):
+        """Show an error when a renderer process terminated."""
+        if status == browsertab.TerminationStatus.normal:
+            pass
+        elif status == browsertab.TerminationStatus.abnormal:
+            message.error("Renderer process exited with status {}".format(
+                code))
+        elif status == browsertab.TerminationStatus.crashed:
+            message.error("Renderer process crashed")
+        elif status == browsertab.TerminationStatus.killed:
+            message.error("Renderer process was killed")
+        else:
+            raise ValueError("Invalid status {}".format(status))
+
     def resizeEvent(self, e):
         """Extend resizeEvent of QWidget to emit a resized signal afterwards.