Docker: New empty shell

The usual boiler plate for plugins, including an option page that
knows how to run "docker search" for demonstration purposes.

Change-Id: I2df91f18f4869cbb2ee8f65ccb8b41969f8c90ae
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/docker/dockersettings.cpp

@@ -0,0 +1,161 @@
+/****************************************************************************
+**
+** Copyright (C) 2021 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** 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 The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#include "dockerconstants.h"
+#include "dockersettings.h"
+
+#include <coreplugin/icore.h>
+
+#include <projectexplorer/projectexplorerconstants.h>
+
+#include <utils/layoutbuilder.h>
+#include <utils/qtcprocess.h>
+#include <utils/qtcsettings.h>
+
+using namespace Utils;
+
+namespace Docker {
+namespace Internal {
+
+// DockerSettings
+
+const char SETTINGS_KEY[] = "Docker";
+
+static DockerSettings *theSettings = nullptr;
+
+DockerSettings::DockerSettings()
+{
+    theSettings = this;
+    setAutoApply(false);
+    readSettings(Core::ICore::settings());
+
+    imageListFilter.setSettingsKey("DockerListFilter");
+    imageListFilter.setPlaceHolderText(tr("<filter>"));
+    imageListFilter.setDisplayStyle(StringAspect::LineEditDisplay);
+    imageListFilter.setLabelText(tr("Filter:"));
+
+    imageList.setDisplayStyle(StringAspect::TextEditDisplay);
+    imageList.setLabelText(tr("Images:"));
+
+    connect(&imageListFilter, &BaseAspect::changed, this, &DockerSettings::updateImageList);
+}
+
+DockerSettings *DockerSettings::instance()
+{
+    return theSettings;
+}
+
+void DockerSettings::writeSettings(QSettings *settings) const
+{
+    settings->remove(SETTINGS_KEY);
+    settings->beginGroup(SETTINGS_KEY);
+    forEachAspect([settings](BaseAspect *aspect) {
+        QtcSettings::setValueWithDefault(settings, aspect->settingsKey(),
+                                         aspect->value(), aspect->defaultValue());
+    });
+    settings->endGroup();
+}
+
+void DockerSettings::updateImageList()
+{
+    QtcProcess process;
+    process.setCommand({"docker", {"search", imageListFilter.value()}});
+
+    const auto finished = QOverload<int, QProcess::ExitStatus>::of(&QProcess::finished);
+    connect(&process, finished, this, [&process, this] {
+        const QString data = QString::fromUtf8(process.readAll());
+        imageList.setValue(data);
+    });
+
+    process.start();
+    process.waitForFinished();
+}
+
+void DockerSettings::readSettings(const QSettings *settings)
+{
+    const QString keyRoot = QString(SETTINGS_KEY) + '/';
+    forEachAspect([settings, keyRoot](BaseAspect *aspect) {
+        QString key = aspect->settingsKey();
+        const QVariant value = settings->value(keyRoot + key, aspect->defaultValue());
+        aspect->setValue(value);
+    });
+}
+
+// DockerOptionsPage
+
+class DockerConfigWidget : public Core::IOptionsPageWidget
+{
+    Q_DECLARE_TR_FUNCTIONS(Docker::Internal::DockerConfigWidget)
+
+public:
+    explicit DockerConfigWidget(DockerSettings *settings);
+
+    void apply() final
+    {
+        m_settings->apply();
+        m_settings->writeSettings(Core::ICore::settings());
+    }
+
+    void finish() final
+    {
+        m_settings->finish();
+    }
+
+private:
+    DockerSettings *m_settings;
+};
+
+DockerConfigWidget::DockerConfigWidget(DockerSettings *settings)
+    : m_settings(settings)
+{
+    using namespace Layouting;
+    DockerSettings &s = *settings;
+
+    Column {
+        Group {
+            Title(tr("Search images on Docker Hub")),
+            Form {
+                s.imageListFilter, Break(),
+                s.imageList
+            },
+        },
+        Stretch()
+    }.attachTo(this);
+}
+
+// DockerOptionsPage
+
+DockerOptionsPage::DockerOptionsPage(DockerSettings *settings)
+{
+    setId(Constants::DOCKER_SETTINGS_ID);
+    setDisplayName(DockerConfigWidget::tr("Docker"));
+    setCategory(ProjectExplorer::Constants::DEVICE_SETTINGS_CATEGORY);
+    setDisplayCategory(QCoreApplication::translate("ProjectExplorer", "Devices"));
+    setCategoryIconPath(":/projectexplorer/images/settingscategory_devices.png");
+    setWidgetCreator([settings] { return new DockerConfigWidget(settings); });
+}
+
+} // Internal
+} // Docker