From 642d835d556ec416b8a20d7c712da0caba655866 Mon Sep 17 00:00:00 2001
From: David Rosca <nowrep@gmail.com>
Date: Sat, 6 Jan 2018 20:23:42 +0100
Subject: [PATCH] WebPage: Disable writing JavaScript warnings on stderr

Can be enabled with QUPZILLA_ENABLE_JS_OUTPUT environment variable.
---
 src/lib/webengine/webpage.cpp | 27 +++++++++++++++++++++++++++
 src/lib/webengine/webpage.h   |  1 +
 2 files changed, 28 insertions(+)

diff --git a/src/lib/webengine/webpage.cpp b/src/lib/webengine/webpage.cpp
index ee2fd799c..8314f41ee 100644
--- a/src/lib/webengine/webpage.cpp
+++ b/src/lib/webengine/webpage.cpp
@@ -48,6 +48,8 @@
 #include <QPushButton>
 #endif
 
+#include <iostream>
+
 #include <QDir>
 #include <QMouseEvent>
 #include <QWebChannel>
@@ -63,6 +65,8 @@ QString WebPage::s_lastUploadLocation = QDir::homePath();
 QUrl WebPage::s_lastUnsupportedUrl;
 QTime WebPage::s_lastUnsupportedUrlTime;
 
+static const bool kEnableJsOutput = qEnvironmentVariableIsSet("QUPZILLA_ENABLE_JS_OUTPUT");
+
 WebPage::WebPage(QObject* parent)
     : QWebEnginePage(mApp->webProfile(), parent)
     , m_fileWatcher(0)
@@ -562,6 +566,29 @@ void WebPage::javaScriptAlert(const QUrl &securityOrigin, const QString &msg)
 #endif
 }
 
+void WebPage::javaScriptConsoleMessage(JavaScriptConsoleMessageLevel level, const QString &message, int lineNumber, const QString &sourceID)
+{
+    if (!kEnableJsOutput) {
+        return;
+    }
+
+    switch (level) {
+    case InfoMessageLevel:
+        std::cout << "[I] ";
+        break;
+
+    case WarningMessageLevel:
+        std::cout << "[W] ";
+        break;
+
+    case ErrorMessageLevel:
+        std::cout << "[E] ";
+        break;
+    }
+
+    std::cout << qPrintable(sourceID) << ":" << lineNumber << " " << qPrintable(message);
+}
+
 void WebPage::setJavaScriptEnabled(bool enabled)
 {
     settings()->setAttribute(QWebEngineSettings::JavascriptEnabled, enabled);
diff --git a/src/lib/webengine/webpage.h b/src/lib/webengine/webpage.h
index 7702f7539..32771e0c3 100644
--- a/src/lib/webengine/webpage.h
+++ b/src/lib/webengine/webpage.h
@@ -59,6 +59,7 @@ public:
     bool javaScriptPrompt(const QUrl &securityOrigin, const QString &msg, const QString &defaultValue, QString* result) Q_DECL_OVERRIDE;
     bool javaScriptConfirm(const QUrl &securityOrigin, const QString &msg) Q_DECL_OVERRIDE;
     void javaScriptAlert(const QUrl &securityOrigin, const QString &msg) Q_DECL_OVERRIDE;
+    void javaScriptConsoleMessage(JavaScriptConsoleMessageLevel level, const QString &message, int lineNumber, const QString &sourceID) override;
 
     void setJavaScriptEnabled(bool enabled);