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/project/mesonrunconfiguration.cpp

@@ -0,0 +1,101 @@
+/****************************************************************************
+**
+** 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 "mesonrunconfiguration.h"
+#include <mesonpluginconstants.h>
+#include <projectexplorer/buildsystem.h>
+#include <projectexplorer/desktoprunconfiguration.h>
+#include <projectexplorer/environmentaspect.h>
+#include <projectexplorer/localenvironmentaspect.h>
+#include <projectexplorer/runconfigurationaspects.h>
+#include <utils/environment.h>
+#include <utils/hostosinfo.h>
+#include <QLatin1String>
+namespace MesonProjectManager {
+namespace Internal {
+MesonRunConfiguration::MesonRunConfiguration(ProjectExplorer::Target *target, Core::Id id)
+    : ProjectExplorer::RunConfiguration{target, id}
+{
+    auto envAspect = addAspect<ProjectExplorer::LocalEnvironmentAspect>(target);
+
+    addAspect<ProjectExplorer::ExecutableAspect>();
+    addAspect<ProjectExplorer::ArgumentsAspect>();
+    addAspect<ProjectExplorer::WorkingDirectoryAspect>();
+    addAspect<ProjectExplorer::TerminalAspect>();
+
+    auto libAspect = addAspect<ProjectExplorer::UseLibraryPathsAspect>();
+    connect(libAspect,
+            &ProjectExplorer::UseLibraryPathsAspect::changed,
+            envAspect,
+            &ProjectExplorer::EnvironmentAspect::environmentChanged);
+
+    if (Utils::HostOsInfo::isMacHost()) {
+        auto dyldAspect = addAspect<ProjectExplorer::UseDyldSuffixAspect>();
+        connect(dyldAspect,
+                &ProjectExplorer::UseLibraryPathsAspect::changed,
+                envAspect,
+                &ProjectExplorer::EnvironmentAspect::environmentChanged);
+        envAspect->addModifier([dyldAspect](Utils::Environment &env) {
+            if (dyldAspect->value())
+                env.set(QLatin1String("DYLD_IMAGE_SUFFIX"), QLatin1String("_debug"));
+        });
+    }
+
+    envAspect->addModifier([this, libAspect](Utils::Environment &env) {
+        ProjectExplorer::BuildTargetInfo bti = buildTargetInfo();
+        if (bti.runEnvModifier)
+            bti.runEnvModifier(env, libAspect->value());
+    });
+
+    setUpdater([this] { updateTargetInformation(); });
+
+    connect(target,
+            &ProjectExplorer::Target::buildSystemUpdated,
+            this,
+            &ProjectExplorer::RunConfiguration::update);
+}
+
+void MesonRunConfiguration::updateTargetInformation()
+{
+    if (!activeBuildSystem())
+        return;
+
+    ProjectExplorer::BuildTargetInfo bti = buildTargetInfo();
+    auto terminalAspect = aspect<ProjectExplorer::TerminalAspect>();
+    terminalAspect->setUseTerminalHint(bti.usesTerminal);
+    aspect<ProjectExplorer::ExecutableAspect>()->setExecutable(bti.targetFilePath);
+    aspect<ProjectExplorer::WorkingDirectoryAspect>()->setDefaultWorkingDirectory(
+        bti.workingDirectory);
+    aspect<ProjectExplorer::LocalEnvironmentAspect>()->environmentChanged();
+}
+
+MesonRunConfigurationFactory::MesonRunConfigurationFactory()
+{
+    registerRunConfiguration<MesonRunConfiguration>("MesonProjectManager.MesonRunConfiguration");
+    addSupportedProjectType(Constants::Project::ID);
+    addSupportedTargetDeviceType(ProjectExplorer::Constants::DESKTOP_DEVICE_TYPE);
+}
+
+} // namespace Internal
+} // namespace MesonProjectManager