Meson build plugin initial support

Most basic project management is implemented:
- Project config/build
- Build options accessible to user
- Lists most build targets
- Meson and Ninja added to kit setup
- Basic project file tree with files known by Meson
- Some basic meson and ninja process output parsing
- Some project templates

Missing features, that will come later:
- Configurable project tree layout
- Locators for Meson
- Build importer
- Access to Machine files for better user fine tuning
- ...

Fixes: QTCREATORBUG-18117
Change-Id: I2811e71562c113fb0fc6b6177bcf0698fa71ef63
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/mesonprojectmanager/machinefiles/nativefilegenerator.cpp

@@ -0,0 +1,62 @@
+/****************************************************************************
+**
+** Copyright (C) 2020 Alexis Jeandet.
+** 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 "nativefilegenerator.h"
+#include <kithelper/kithelper.h>
+#include <projectexplorer/kitinformation.h>
+#include <projectexplorer/kitmanager.h>
+#include <projectexplorer/projectexplorerconstants.h>
+#include <projectexplorer/toolchain.h>
+#include <utils/macroexpander.h>
+#include <utils/qtcassert.h>
+
+namespace MesonProjectManager {
+namespace Internal {
+NativeFileGenerator::NativeFileGenerator() {}
+
+inline void addEntry(QIODevice *nativeFile, const QString &key, const QString &value)
+{
+    nativeFile->write(QString("%1 = '%2'\n").arg(key).arg(value).toUtf8());
+}
+
+void writeBinariesSection(QIODevice *nativeFile, const KitData &kitData)
+{
+    nativeFile->write("[binaries]\n");
+    addEntry(nativeFile, "c", kitData.cCompilerPath);
+    addEntry(nativeFile, "cpp", kitData.cxxCompilerPath);
+    addEntry(nativeFile, "qmake", kitData.qmakePath);
+    if (kitData.qtVersion == Utils::QtVersion::Qt4)
+        addEntry(nativeFile, QString{"qmake-qt4"}, kitData.qmakePath);
+    else if (kitData.qtVersion == Utils::QtVersion::Qt5)
+        addEntry(nativeFile, QString{"qmake-qt5"}, kitData.qmakePath);
+    addEntry(nativeFile, "cmake", kitData.cmakePath);
+}
+
+void NativeFileGenerator::makeNativeFile(QIODevice *nativeFile, const KitData &kitData)
+{
+    QTC_ASSERT(nativeFile, return );
+    writeBinariesSection(nativeFile, kitData);
+}
+} // namespace Internal
+} // namespace MesonProjectManager