Python: extract pip installation task

Make it reusable for pyside and other packages.

Change-Id: If97e65a506d36916aaa61f48b9a2f71c458d4fe9
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/python/pipsupport.h

@@ -0,0 +1,77 @@
+/****************************************************************************
+**
+** Copyright (C) 2022 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.
+**
+****************************************************************************/
+
+#pragma once
+
+#include <utils/filepath.h>
+#include <utils/qtcprocess.h>
+
+#include <QFutureWatcher>
+
+namespace Python {
+namespace Internal {
+
+class PipPackage
+{
+public:
+    explicit PipPackage(const QString &packageName = {},
+                        const QString &displayName = {},
+                        const QString &version = {})
+        : packageName(packageName)
+        , displayName(displayName.isEmpty() ? packageName : displayName)
+        , version(version)
+    {}
+    QString packageName;
+    QString displayName;
+    QString version;
+};
+
+class PipInstallTask : public QObject
+{
+    Q_OBJECT
+public:
+    explicit PipInstallTask(const Utils::FilePath &python);
+    void setPackage(const PipPackage &package);
+    void run();
+
+signals:
+    void finished(bool success);
+
+private:
+    void cancel();
+    void installFinished();
+    void handleOutput();
+    void hanleError();
+
+    const Utils::FilePath m_python;
+    PipPackage m_package;
+    Utils::QtcProcess m_process;
+    QFutureInterface<void> m_future;
+    QFutureWatcher<void> m_watcher;
+    QTimer m_killTimer;
+};
+
+} // namespace Internal
+} // namespace Python