Nim: Introduce a NimBuildSystem

Change-Id: Ib9bdf52939c88f01fe861308d0c08b5c69efa624
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/nim/CMakeLists.txt

@@ -8,6 +8,7 @@ add_qtc_plugin(Nim
     nim.qrc
     nimconstants.h
     nimplugin.cpp nimplugin.h
+    project/nimbuildsystem.cpp project/nimbuildsystem.h
     project/nimbuildconfiguration.cpp project/nimbuildconfiguration.h
     project/nimcompilerbuildstep.cpp project/nimcompilerbuildstep.h
     project/nimcompilerbuildstepconfigwidget.cpp project/nimcompilerbuildstepconfigwidget.h project/nimcompilerbuildstepconfigwidget.ui

src/plugins/nim/nim.pro

@@ -16,6 +16,7 @@ HEADERS += \
     editor/nimindenter.h \
     tools/nimlexer.h \
     tools/sourcecodestream.h \
+    project/nimbuildsystem.h \
     project/nimproject.h \
     project/nimprojectnode.h \
     project/nimbuildconfiguration.h \
@@ -45,6 +46,7 @@ SOURCES += \
     editor/nimhighlighter.cpp \
     editor/nimindenter.cpp \
     tools/nimlexer.cpp \
+    project/nimbuildsystem.cpp \
     project/nimproject.cpp \
     project/nimprojectnode.cpp \
     project/nimbuildconfiguration.cpp \

src/plugins/nim/nim.qbs

@@ -36,6 +36,7 @@ QtcPlugin {
         name: "Project"
         prefix: "project/"
         files: [
+            "nimbuildsystem.cpp", "nimbuildsystem.h",
             "nimbuildconfiguration.h", "nimbuildconfiguration.cpp",
             "nimcompilerbuildstep.h", "nimcompilerbuildstep.cpp",
             "nimcompilerbuildstepconfigwidget.h", "nimcompilerbuildstepconfigwidget.cpp", "nimcompilerbuildstepconfigwidget.ui",

src/plugins/nim/project/nimbuildconfiguration.cpp

@@ -24,9 +24,7 @@
 ****************************************************************************/
 
 #include "nimbuildconfiguration.h"
-#include "nimcompilerbuildstep.h"
-#include "nimproject.h"
-#include "nimbuildconfiguration.h"
+#include "nimbuildsystem.h"
 #include "nimcompilerbuildstep.h"
 #include "nimproject.h"
 
@@ -80,12 +78,12 @@ void NimBuildConfiguration::initialize()
 {
     BuildConfiguration::initialize();
 
-    auto project = qobject_cast<NimProject *>(target()->project());
-    QTC_ASSERT(project, return);
+    auto bs = qobject_cast<NimBuildSystem *>(project()->buildSystem());
+    QTC_ASSERT(bs, return );
 
     // Create the build configuration and initialize it from build info
     setBuildDirectory(defaultBuildDirectory(target()->kit(),
-                                            project->projectFilePath(),
+                                            project()->projectFilePath(),
                                             displayName(),
                                             buildType()));
 
@@ -106,7 +104,7 @@ void NimBuildConfiguration::initialize()
             break;
         }
         nimCompilerBuildStep->setDefaultCompilerOptions(defaultOption);
-        Utils::FilePathList nimFiles = project->nimFiles();
+        Utils::FilePathList nimFiles = bs->nimFiles();
         if (!nimFiles.isEmpty())
             nimCompilerBuildStep->setTargetNimFile(nimFiles.first());
         buildSteps->appendStep(nimCompilerBuildStep);

src/plugins/nim/project/nimbuildsystem.cpp

@@ -0,0 +1,177 @@
+/****************************************************************************
+**
+** Copyright (C) Filippo Cucchetto <filippocucchetto@gmail.com>
+** Contact: http://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 "nimbuildsystem.h"
+
+#include "nimproject.h"
+#include "nimprojectnode.h"
+
+#include <utils/algorithm.h>
+#include <utils/fileutils.h>
+#include <utils/qtcassert.h>
+
+#include <QVariantMap>
+
+#if 0
+#include "nimbuildconfiguration.h"
+#include "nimtoolchain.h"
+
+#include "../nimconstants.h"
+
+#include <coreplugin/icontext.h>
+#include <coreplugin/progressmanager/progressmanager.h>
+#include <coreplugin/iversioncontrol.h>
+#include <coreplugin/vcsmanager.h>
+#include <projectexplorer/buildconfiguration.h>
+#include <projectexplorer/kit.h>
+#include <projectexplorer/projectexplorerconstants.h>
+#include <projectexplorer/projectnodes.h>
+#include <projectexplorer/target.h>
+#include <projectexplorer/toolchain.h>
+#include <projectexplorer/kitinformation.h>
+#include <texteditor/textdocument.h>
+
+#include <utils/runextensions.h>
+
+#include <coreplugin/editormanager/editormanager.h>
+#include <coreplugin/editormanager/ieditor.h>
+
+#include <QFileInfo>
+#include <QQueue>
+#endif
+
+using namespace ProjectExplorer;
+using namespace Utils;
+
+namespace Nim {
+
+const char SETTINGS_KEY[] = "Nim.BuildSystem";
+const char EXCLUDED_FILES_KEY[] = "ExcludedFiles";
+
+NimBuildSystem::NimBuildSystem(Project *project)
+    : BuildSystem(project)
+{
+    connect(project, &Project::settingsLoaded, this, &NimBuildSystem::loadSettings);
+    connect(project, &Project::aboutToSaveSettings, this, &NimBuildSystem::saveSettings);
+
+    connect(&m_scanner, &TreeScanner::finished, this, &NimBuildSystem::updateProject);
+    m_scanner.setFilter([this](const Utils::MimeType &, const Utils::FilePath &fp) {
+        const QString path = fp.toString();
+        return excludedFiles().contains(path) || path.endsWith(".nimproject")
+               || path.contains(".nimproject.user");
+    });
+
+    connect(&m_directoryWatcher, &FileSystemWatcher::directoryChanged, this, [this]() {
+        requestParse();
+    });
+}
+
+bool NimBuildSystem::addFiles(const QStringList &filePaths)
+{
+    m_excludedFiles = Utils::filtered(m_excludedFiles, [&](const QString & f) {
+        return !filePaths.contains(f);
+    });
+    requestParse();
+    return true;
+}
+
+bool NimBuildSystem::removeFiles(const QStringList &filePaths)
+{
+    m_excludedFiles.append(filePaths);
+    m_excludedFiles = Utils::filteredUnique(m_excludedFiles);
+    requestParse();
+    return true;
+}
+
+bool NimBuildSystem::renameFile(const QString &filePath, const QString &newFilePath)
+{
+    Q_UNUSED(filePath)
+    m_excludedFiles.removeOne(newFilePath);
+    requestParse();
+    return true;
+}
+
+void NimBuildSystem::setExcludedFiles(const QStringList &list)
+{
+    m_excludedFiles = list;
+}
+
+QStringList NimBuildSystem::excludedFiles()
+{
+    return m_excludedFiles;
+}
+
+void NimBuildSystem::parseProject(BuildSystem::ParsingContext &&ctx)
+{
+    QTC_ASSERT(!m_currentContext.project, return );
+    m_currentContext = std::move(ctx);
+    QTC_CHECK(m_currentContext.project);
+
+    m_scanner.asyncScanForFiles(m_currentContext.project->projectDirectory());
+}
+
+const FilePathList NimBuildSystem::nimFiles() const
+{
+    return project()->files(
+        [](const Node *n) { return Project::AllFiles(n) && n->path().endsWith(".nim"); });
+}
+
+void NimBuildSystem::loadSettings()
+{
+    QVariantMap settings = project()->namedSettings(SETTINGS_KEY).toMap();
+    if (settings.contains(EXCLUDED_FILES_KEY))
+        m_excludedFiles = settings.value(EXCLUDED_FILES_KEY, m_excludedFiles).toStringList();
+
+    requestParse();
+}
+
+void NimBuildSystem::saveSettings()
+{
+    QVariantMap settings;
+    settings.insert(EXCLUDED_FILES_KEY, m_excludedFiles);
+    project()->setNamedSettings(SETTINGS_KEY, settings);
+}
+
+void NimBuildSystem::updateProject()
+{
+    auto newRoot = std::make_unique<NimProjectNode>(project()->projectDirectory());
+
+    QSet<QString> directories;
+    for (FileNode *node : m_scanner.release()) {
+        directories.insert(node->directory());
+        newRoot->addNestedNode(std::unique_ptr<FileNode>(node));
+    }
+
+    newRoot->setDisplayName(project()->displayName());
+    project()->setRootProjectNode(std::move(newRoot));
+
+    m_directoryWatcher.addDirectories(directories.toList(), FileSystemWatcher::WatchAllChanges);
+
+    m_currentContext.guard.markAsSuccess();
+
+    m_currentContext = {};
+}
+
+} // namespace Nim

src/plugins/nim/project/nimbuildsystem.h

@@ -0,0 +1,69 @@
+/****************************************************************************
+**
+** Copyright (C) Filippo Cucchetto <filippocucchetto@gmail.com>
+** Contact: http://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 <projectexplorer/buildsystem.h>
+#include <projectexplorer/treescanner.h>
+
+#include <utils/filesystemwatcher.h>
+
+namespace Nim {
+
+class NimBuildSystem : public ProjectExplorer::BuildSystem
+{
+    Q_OBJECT
+
+public:
+    explicit NimBuildSystem(ProjectExplorer::Project *project);
+
+    bool addFiles(const QStringList &filePaths);
+    bool removeFiles(const QStringList &filePaths);
+    bool renameFile(const QString &filePath, const QString &newFilePath);
+
+    void setExcludedFiles(const QStringList &list); // Keep for compatibility with Qt Creator 4.10
+    QStringList excludedFiles(); // Make private when no longer supporting Qt Creator 4.10
+
+    void parseProject(ParsingContext &&ctx) final;
+
+    const Utils::FilePathList nimFiles() const;
+
+private:
+    void loadSettings();
+    void saveSettings();
+
+    void collectProjectFiles();
+    void updateProject();
+
+    QStringList m_excludedFiles;
+
+    ProjectExplorer::TreeScanner m_scanner;
+
+    ParsingContext m_currentContext;
+
+    Utils::FileSystemWatcher m_directoryWatcher;
+};
+
+} // namespace Nim

src/plugins/nim/project/nimcompilerbuildstep.cpp

@@ -25,9 +25,9 @@
 
 #include "nimcompilerbuildstep.h"
 #include "nimbuildconfiguration.h"
-#include "nimconstants.h"
+#include "nimbuildsystem.h"
 #include "nimcompilerbuildstepconfigwidget.h"
-#include "nimproject.h"
+#include "nimconstants.h"
 #include "nimtoolchain.h"
 
 #include <projectexplorer/buildconfiguration.h>
@@ -271,7 +271,8 @@ void NimCompilerBuildStep::updateTargetNimFile()
 {
     if (!m_targetNimFile.isEmpty())
         return;
-    const Utils::FilePathList nimFiles = static_cast<NimProject *>(project())->nimFiles();
+    const Utils::FilePathList nimFiles = static_cast<NimBuildSystem *>(project()->buildSystem())
+                                             ->nimFiles();
     if (!nimFiles.isEmpty())
         setTargetNimFile(nimFiles.at(0));
 }

src/plugins/nim/project/nimcompilerbuildstepconfigwidget.cpp

@@ -24,10 +24,11 @@
 ****************************************************************************/
 
 #include "nimcompilerbuildstepconfigwidget.h"
-#include "ui_nimcompilerbuildstepconfigwidget.h"
 #include "nimbuildconfiguration.h"
+#include "nimbuildsystem.h"
 #include "nimcompilerbuildstep.h"
-#include "nimproject.h"
+
+#include "ui_nimcompilerbuildstepconfigwidget.h"
 
 #include "../nimconstants.h"
 
@@ -52,9 +53,10 @@ NimCompilerBuildStepConfigWidget::NimCompilerBuildStepConfigWidget(NimCompilerBu
     setSummaryText(tr(Constants::C_NIMCOMPILERBUILDSTEPWIDGET_SUMMARY));
 
     // Connect the project signals
-    auto project = static_cast<NimProject *>(m_buildStep->project());
-    connect(project, &NimProject::fileListChanged,
-            this, &NimCompilerBuildStepConfigWidget::updateUi);
+    connect(m_buildStep->project(),
+            &Project::fileListChanged,
+            this,
+            &NimCompilerBuildStepConfigWidget::updateUi);
 
     // Connect build step signals
     connect(m_buildStep, &NimCompilerBuildStep::processParametersChanged,
@@ -114,12 +116,12 @@ void NimCompilerBuildStepConfigWidget::updateTargetComboBox()
 {
     QTC_ASSERT(m_buildStep, return );
 
-    auto project = qobject_cast<NimProject *>(m_buildStep->project());
-    QTC_ASSERT(project, return);
+    const auto bs = qobject_cast<NimBuildSystem *>(m_buildStep->project()->buildSystem());
+    QTC_ASSERT(bs, return );
 
     // Re enter the files
     m_ui->targetComboBox->clear();
-    foreach (const FilePath &file, project->nimFiles())
+    for (const FilePath &file : bs->nimFiles())
         m_ui->targetComboBox->addItem(file.fileName(), file.toString());
 
     const int index = m_ui->targetComboBox->findData(m_buildStep->targetNimFile().toString());

src/plugins/nim/project/nimproject.cpp

@@ -24,42 +24,20 @@
 ****************************************************************************/
 
 #include "nimproject.h"
-#include "nimbuildconfiguration.h"
-#include "nimprojectnode.h"
-#include "nimtoolchain.h"
 
 #include "../nimconstants.h"
+#include "nimbuildsystem.h"
+#include "nimtoolchain.h"
 
 #include <coreplugin/icontext.h>
-#include <coreplugin/progressmanager/progressmanager.h>
-#include <coreplugin/iversioncontrol.h>
-#include <coreplugin/vcsmanager.h>
-#include <projectexplorer/buildconfiguration.h>
-#include <projectexplorer/kit.h>
-#include <projectexplorer/projectexplorerconstants.h>
-#include <projectexplorer/projectnodes.h>
-#include <projectexplorer/target.h>
-#include <projectexplorer/toolchain.h>
 #include <projectexplorer/kitinformation.h>
-#include <texteditor/textdocument.h>
-
-#include <utils/algorithm.h>
-#include <utils/qtcassert.h>
-#include <utils/runextensions.h>
-
-#include <coreplugin/editormanager/editormanager.h>
-#include <coreplugin/editormanager/ieditor.h>
-
-#include <QFileInfo>
-#include <QQueue>
+#include <projectexplorer/projectexplorerconstants.h>
 
 using namespace ProjectExplorer;
 using namespace Utils;
 
 namespace Nim {
 
-const int MIN_TIME_BETWEEN_PROJECT_SCANS = 4500;
-
 NimProject::NimProject(const FilePath &fileName) : Project(Constants::C_NIM_MIMETYPE, fileName)
 {
     setId(Constants::C_NIMPROJECT_ID);
@@ -67,87 +45,7 @@ NimProject::NimProject(const FilePath &fileName) : Project(Constants::C_NIM_MIME
     // ensure debugging is enabled (Nim plugin translates nim code to C code)
     setProjectLanguages(Core::Context(ProjectExplorer::Constants::CXX_LANGUAGE_ID));
 
-    m_projectScanTimer.setSingleShot(true);
-    connect(&m_projectScanTimer, &QTimer::timeout, this, &NimProject::collectProjectFiles);
-    connect(this, &Project::settingsLoaded, this, &NimProject::collectProjectFiles);
-
-    connect(&m_futureWatcher, &QFutureWatcher<QList<FileNode *>>::finished, this,
-            &NimProject::updateProject);
-}
-
-void NimProject::scheduleProjectScan()
-{
-    auto elapsedTime = m_lastProjectScan.elapsed();
-    if (elapsedTime < MIN_TIME_BETWEEN_PROJECT_SCANS) {
-        if (!m_projectScanTimer.isActive()) {
-            m_projectScanTimer.setInterval(MIN_TIME_BETWEEN_PROJECT_SCANS - elapsedTime);
-            m_projectScanTimer.start();
-        }
-    } else {
-        collectProjectFiles();
-    }
-}
-
-bool NimProject::addFiles(const QStringList &filePaths)
-{
-    m_excludedFiles = Utils::filtered(m_excludedFiles, [&](const QString & f) {
-        return !filePaths.contains(f);
-    });
-    scheduleProjectScan();
-    return true;
-}
-
-bool NimProject::removeFiles(const QStringList &filePaths)
-{
-    m_excludedFiles.append(filePaths);
-    m_excludedFiles = Utils::filteredUnique(m_excludedFiles);
-    scheduleProjectScan();
-    return true;
-}
-
-bool NimProject::renameFile(const QString &filePath, const QString &newFilePath)
-{
-    Q_UNUSED(filePath)
-    m_excludedFiles.removeOne(newFilePath);
-    scheduleProjectScan();
-    return true;
-}
-
-void NimProject::collectProjectFiles()
-{
-    m_lastProjectScan.start();
-    QTC_ASSERT(!m_futureWatcher.future().isRunning(), return);
-    FilePath prjDir = projectDirectory();
-    QFuture<QList<ProjectExplorer::FileNode *>> future = Utils::runAsync([prjDir,
-    excluded = m_excludedFiles] {
-        return FileNode::scanForFiles(prjDir, [excluded](const FilePath & fn) -> FileNode * {
-            const QString fileName = fn.fileName();
-            if (excluded.contains(fn.toString())
-                    || fileName.endsWith(".nimproject", HostOsInfo::fileNameCaseSensitivity())
-                    || fileName.contains(".nimproject.user", HostOsInfo::fileNameCaseSensitivity()))
-                return nullptr;
-            return new FileNode(fn, FileType::Source);
-        });
-    });
-    m_futureWatcher.setFuture(future);
-    Core::ProgressManager::addTask(future, tr("Scanning for Nim files"), "Nim.Project.Scan");
-}
-
-void NimProject::updateProject()
-{
-    ParseGuard guard = guardParsingRun();
-
-    auto newRoot = std::make_unique<NimProjectNode>(*this, projectDirectory());
-
-    QList<FileNode *> files = m_futureWatcher.future().result();
-
-    for (FileNode *node : files)
-        newRoot->addNestedNode(std::unique_ptr<FileNode>(node));
-
-    newRoot->setDisplayName(displayName());
-    setRootProjectNode(std::move(newRoot));
-
-    guard.markAsSuccess();
+    setBuildSystem(std::make_unique<NimBuildSystem>(this));
 }
 
 Tasks NimProject::projectIssues(const Kit *k) const
@@ -164,24 +62,20 @@ Tasks NimProject::projectIssues(const Kit *k) const
     return result;
 }
 
-FilePathList NimProject::nimFiles() const
-{
-    return files([](const ProjectExplorer::Node *n) {
-        return AllFiles(n) && n->filePath().endsWith(".nim");
-    });
-}
-
 QVariantMap NimProject::toMap() const
 {
     QVariantMap result = Project::toMap();
-    result[Constants::C_NIMPROJECT_EXCLUDEDFILES] = m_excludedFiles;
+    result[Constants::C_NIMPROJECT_EXCLUDEDFILES] = static_cast<NimBuildSystem *>(buildSystem())
+                                                        ->excludedFiles();
     return result;
 }
 
 Project::RestoreResult NimProject::fromMap(const QVariantMap &map, QString *errorMessage)
 {
-    m_excludedFiles = map.value(Constants::C_NIMPROJECT_EXCLUDEDFILES).toStringList();
-    return Project::fromMap(map, errorMessage);
+    auto result = Project::fromMap(map, errorMessage);
+    static_cast<NimBuildSystem *>(buildSystem())
+        ->setExcludedFiles(map.value(Constants::C_NIMPROJECT_EXCLUDEDFILES).toStringList());
+    return result;
 }
 
 } // namespace Nim

src/plugins/nim/project/nimproject.h

@@ -34,6 +34,8 @@
 
 namespace Nim {
 
+class NimBuildSystem;
+
 class NimProject : public ProjectExplorer::Project
 {
     Q_OBJECT
@@ -42,25 +44,13 @@ public:
     explicit NimProject(const Utils::FilePath &fileName);
 
     ProjectExplorer::Tasks projectIssues(const ProjectExplorer::Kit *k) const final;
-    Utils::FilePathList nimFiles() const;
+
+    // Keep for compatibility with Qt Creator 4.10
     QVariantMap toMap() const final;
 
-    bool addFiles(const QStringList &filePaths);
-    bool removeFiles(const QStringList &filePaths);
-    bool renameFile(const QString &filePath, const QString &newFilePath);
-
 protected:
+    // Keep for compatibility with Qt Creator 4.10
     RestoreResult fromMap(const QVariantMap &map, QString *errorMessage) final;
-
-private:
-    void scheduleProjectScan();
-    void collectProjectFiles();
-    void updateProject();
-
-    QStringList m_excludedFiles;
-    QFutureWatcher<QList<ProjectExplorer::FileNode *>> m_futureWatcher;
-    QElapsedTimer m_lastProjectScan;
-    QTimer m_projectScanTimer;
 };
 
-}
+} // namespace Nim

src/plugins/nim/project/nimprojectnode.cpp

@@ -24,17 +24,18 @@
 ****************************************************************************/
 
 #include "nimprojectnode.h"
-#include "nimproject.h"
+
+#include "nimbuildsystem.h"
+
+#include <projectexplorer/projecttree.h>
 
 using namespace ProjectExplorer;
 using namespace Utils;
 
 namespace Nim {
 
-NimProjectNode::NimProjectNode(NimProject &project,
-                               const FilePath &projectFilePath)
+NimProjectNode::NimProjectNode(const FilePath &projectFilePath)
     : ProjectNode(projectFilePath)
-    , m_project(project)
 {}
 
 bool NimProjectNode::supportsAction(ProjectAction action, const Node *node) const
@@ -53,13 +54,13 @@ bool NimProjectNode::supportsAction(ProjectAction action, const Node *node) cons
 
 bool NimProjectNode::addFiles(const QStringList &filePaths, QStringList *)
 {
-    return m_project.addFiles(filePaths);
+    return buildSystem()->addFiles(filePaths);
 }
 
 RemovedFilesFromProject NimProjectNode::removeFiles(const QStringList &filePaths,
                                                     QStringList *)
 {
-    return m_project.removeFiles(filePaths) ? RemovedFilesFromProject::Ok
+    return buildSystem()->removeFiles(filePaths) ? RemovedFilesFromProject::Ok
                                                  : RemovedFilesFromProject::Error;
 }
 
@@ -70,7 +71,13 @@ bool NimProjectNode::deleteFiles(const QStringList &)
 
 bool NimProjectNode::renameFile(const QString &filePath, const QString &newFilePath)
 {
-    return m_project.renameFile(filePath, newFilePath);
+    return buildSystem()->renameFile(filePath, newFilePath);
 }
 
+NimBuildSystem *NimProjectNode::buildSystem() const
+{
+    return qobject_cast<NimBuildSystem *>(
+        ProjectTree::instance()->projectForNode(this)->buildSystem());
 }
+
+} // namespace Nim

src/plugins/nim/project/nimprojectnode.h

@@ -31,12 +31,12 @@ namespace Utils { class FilePath; }
 
 namespace Nim {
 
-class NimProject;
+class NimBuildSystem;
 
 class NimProjectNode : public ProjectExplorer::ProjectNode
 {
 public:
-    NimProjectNode(NimProject &project, const Utils::FilePath &projectFilePath);
+    NimProjectNode(const Utils::FilePath &projectFilePath);
 
     bool supportsAction(ProjectExplorer::ProjectAction action, const Node *node) const override;
     bool addFiles(const QStringList &filePaths, QStringList *) override;
@@ -46,7 +46,7 @@ public:
     bool renameFile(const QString &filePath, const QString &newFilePath) override;
 
 private:
-    NimProject &m_project;
+    NimBuildSystem *buildSystem() const;
 };
 
 }