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diff --git a/src/app/config-ui/commandlineparser.cpp b/src/app/config-ui/commandlineparser.cpp
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+++ b/src/app/config-ui/commandlineparser.cpp
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+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the Qt Build Suite.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia.  For licensing terms and
+** conditions see http://qt.digia.com/licensing.  For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights.  These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+****************************************************************************/
+#include "commandlineparser.h"
+
+#include <logging/translator.h>
+#include <tools/error.h>
+
+#include <QFileInfo>
+
+using qbs::Internal::Tr;
+
+static QString helpOptionShort() { return QLatin1String("-h"); }
+static QString helpOptionLong() { return QLatin1String("--help"); }
+
+void CommandLineParser::parse(const QStringList &commandLine)
+{
+    m_commandLine = commandLine;
+    Q_ASSERT(!m_commandLine.isEmpty());
+    m_command = QFileInfo(m_commandLine.takeFirst()).fileName();
+    m_helpRequested = false;
+
+    if (m_commandLine.isEmpty())
+        return;
+    const QString &arg = m_commandLine.first();
+    if (arg == helpOptionShort() || arg == helpOptionLong()) {
+        m_commandLine.removeFirst();
+        m_helpRequested = true;
+    }
+
+    if (!m_commandLine.isEmpty())
+        complainAboutExtraArguments();
+}
+
+void CommandLineParser::throwError(const QString &message)
+{
+    qbs::ErrorInfo error(Tr::tr("Syntax error: %1").arg(message));
+    error.append(usageString());
+    throw error;
+}
+
+QString CommandLineParser::usageString() const
+{
+    QString s = Tr::tr("This tool displays qbs settings in a GUI.\n"
+                       "If you have more than a few settings, this might be preferable to "
+                       "plain \"qbs config\", as it presents a hierarchical view.\n");
+    s += Tr::tr("Usage:\n");
+    s += Tr::tr("    %1 [%3|%4]\n")
+            .arg(m_command, helpOptionShort(), helpOptionLong());
+    return s;
+}
+
+void CommandLineParser::assignOptionArgument(const QString &option, QString &argument)
+{
+    if (m_commandLine.isEmpty())
+        throwError(Tr::tr("Option '%1' needs an argument.").arg(option));
+    argument = m_commandLine.takeFirst();
+    if (argument.isEmpty())
+        throwError(Tr::tr("Argument for option '%1' must not be empty.").arg(option));
+}
+
+void CommandLineParser::complainAboutExtraArguments()
+{
+    throwError(Tr::tr("Extraneous command-line arguments '%1'.")
+               .arg(m_commandLine.join(QLatin1String(" "))));
+}