Meson: Flatten directory hierarchy

Keep tests/ and icons/ but put the rest into the toplevel.

The previous setup was so different from the rest of the bunch that
it regularly stuck out in maintenance tasks.

Change-Id: I69821be6268f69682353a388f6bb1fa343215303
Reviewed-by: Qt CI Bot <qt_ci_bot@qt-project.org>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>

src/plugins/mesonprojectmanager/mesontools.cpp

@@ -0,0 +1,91 @@
+// Copyright (C) 2020 Alexis Jeandet.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
+
+#include "mesontools.h"
+
+namespace MesonProjectManager {
+namespace Internal {
+
+template<typename T>
+inline bool is(const MesonTools::Tool_t &tool)
+{
+    return bool(std::dynamic_pointer_cast<T>(tool));
+}
+
+template<typename T>
+std::shared_ptr<T> tool(const Utils::Id &id, const std::vector<MesonTools::Tool_t> &tools)
+{
+    static_assert(std::is_base_of<ToolWrapper, T>::value, "Type must derive from ToolWrapper");
+    const auto tool = std::find_if(std::cbegin(tools),
+                                   std::cend(tools),
+                                   [&id](const MesonTools::Tool_t &tool) {
+                                       return tool->id() == id;
+                                   });
+    if (tool != std::cend(tools) && is<T>(*tool))
+        return std::dynamic_pointer_cast<T>(*tool);
+    return nullptr;
+}
+
+template<typename T>
+std::shared_ptr<T> autoDetected(const std::vector<MesonTools::Tool_t> &tools)
+{
+    static_assert(std::is_base_of<ToolWrapper, T>::value, "Type must derive from ToolWrapper");
+    for (const auto &tool : tools) {
+        if (tool->autoDetected() && is<T>(tool)) {
+            return std::dynamic_pointer_cast<T>(tool);
+        }
+    }
+    return nullptr;
+}
+
+template<typename T>
+void fixAutoDetected(std::vector<MesonTools::Tool_t> &tools)
+{
+    auto autoDetectedTool = autoDetected<T>(tools);
+    if (!autoDetectedTool) {
+        auto path = T::find();
+        if (path)
+            tools.emplace_back(std::make_shared<T>(
+                QString("System %1 at %2").arg(T::toolName()).arg(path->toString()), *path, true));
+    }
+}
+
+bool MesonTools::isMesonWrapper(const MesonTools::Tool_t &tool)
+{
+    return is<MesonWrapper>(tool);
+}
+
+bool MesonTools::isNinjaWrapper(const MesonTools::Tool_t &tool)
+{
+    return is<NinjaWrapper>(tool);
+}
+
+void MesonTools::setTools(std::vector<MesonTools::Tool_t> &&tools)
+{
+    auto self = instance();
+    std::swap(self->m_tools, tools);
+    fixAutoDetected<MesonWrapper>(self->m_tools);
+    fixAutoDetected<NinjaWrapper>(self->m_tools);
+}
+
+std::shared_ptr<NinjaWrapper> MesonTools::ninjaWrapper(const Utils::Id &id)
+{
+    return tool<NinjaWrapper>(id, MesonTools::instance()->m_tools);
+}
+std::shared_ptr<MesonWrapper> MesonTools::mesonWrapper(const Utils::Id &id)
+{
+    return tool<MesonWrapper>(id, MesonTools::instance()->m_tools);
+}
+
+std::shared_ptr<NinjaWrapper> MesonTools::ninjaWrapper()
+{
+    return autoDetected<NinjaWrapper>(MesonTools::instance()->m_tools);
+}
+
+std::shared_ptr<MesonWrapper> MesonTools::mesonWrapper()
+{
+    return autoDetected<MesonWrapper>(MesonTools::instance()->m_tools);
+}
+
+} // namespace Internal
+} // namespace MesonProjectManager