CppEditor: Simplify CppCodeModelSettings setup

Change-Id: Ie6849caf8ded2c0901a9d2daeda6a1f81b68ed72
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/cppeditor/builtineditordocumentprocessor.cpp

@@ -150,7 +150,7 @@ BuiltinEditorDocumentProcessor::BuiltinEditorDocumentProcessor(TextEditor::TextD
 {
     using namespace Internal;
 
-    const CppCodeModelSettings *cms = CppEditorPlugin::instance()->codeModelSettings();
+    const CppCodeModelSettings *cms = &cppCodeModelSettings();
 
     BaseEditorDocumentParser::Configuration config = m_parser->configuration();
     config.usePrecompiledHeaders = cms->pchUsage() != CppCodeModelSettings::PchUse_None;

src/plugins/cppeditor/cppcodemodelsettings.cpp

@@ -68,6 +68,11 @@ static FilePath fallbackClangdFilePath()
     return Environment::systemEnvironment().searchInPath("clangd");
 }
 
+CppCodeModelSettings::CppCodeModelSettings()
+{
+    fromSettings(Core::ICore::settings());
+}
+
 void CppCodeModelSettings::fromSettings(QtcSettings *s)
 {
     s->beginGroup(Constants::CPPEDITOR_SETTINGSGROUP);
@@ -594,4 +599,10 @@ int ClangdSettings::Data::defaultCompletionResults()
     return ok ? userValue : 100;
 }
 
+CppCodeModelSettings &cppCodeModelSettings()
+{
+    static CppCodeModelSettings theCppCodeModelSettings;
+    return theCppCodeModelSettings;
+}
+
 } // namespace CppEditor

src/plugins/cppeditor/cppcodemodelsettings.h

@@ -31,6 +31,8 @@ public:
     };
 
 public:
+    CppCodeModelSettings();
+
     void fromSettings(Utils::QtcSettings *s);
     void toSettings(Utils::QtcSettings *s);
 
@@ -212,4 +214,6 @@ private:
     bool m_blockIndexing = false;
 };
 
+CppCodeModelSettings &cppCodeModelSettings();
+
 } // namespace CppEditor

src/plugins/cppeditor/cppcodemodelsettingspage.cpp

@@ -46,7 +46,7 @@ namespace CppEditor::Internal {
 class CppCodeModelSettingsWidget final : public Core::IOptionsPageWidget
 {
 public:
-    CppCodeModelSettingsWidget(CppCodeModelSettings *s);
+    CppCodeModelSettingsWidget();
 
 private:
     void apply() final;
@@ -63,8 +63,8 @@ private:
     QPlainTextEdit *m_ignorePatternTextEdit;
 };
 
-CppCodeModelSettingsWidget::CppCodeModelSettingsWidget(CppCodeModelSettings *s)
-    : m_settings(s)
+CppCodeModelSettingsWidget::CppCodeModelSettingsWidget()
+    : m_settings(&cppCodeModelSettings())
 {
     m_interpretAmbiguousHeadersAsCHeaders
         = new QCheckBox(Tr::tr("Interpret ambiguous headers as C headers"));
@@ -184,14 +184,14 @@ bool CppCodeModelSettingsWidget::applyGeneralWidgetsToSettings() const
     return settingsChanged;
 }
 
-CppCodeModelSettingsPage::CppCodeModelSettingsPage(CppCodeModelSettings *settings)
+CppCodeModelSettingsPage::CppCodeModelSettingsPage()
 {
     setId(Constants::CPP_CODE_MODEL_SETTINGS_ID);
     setDisplayName(Tr::tr("Code Model"));
     setCategory(Constants::CPP_SETTINGS_CATEGORY);
     setDisplayCategory(Tr::tr("C++"));
     setCategoryIconPath(":/projectexplorer/images/settingscategory_cpp.png");
-    setWidgetCreator([settings] { return new CppCodeModelSettingsWidget(settings); });
+    setWidgetCreator([] { return new CppCodeModelSettingsWidget; });
 }
 
 class ClangdSettingsWidget::Private

src/plugins/cppeditor/cppcodemodelsettingspage.h

@@ -12,7 +12,7 @@ namespace CppEditor::Internal {
 class CppCodeModelSettingsPage final : public Core::IOptionsPage
 {
 public:
-    explicit CppCodeModelSettingsPage(CppCodeModelSettings *settings);
+    CppCodeModelSettingsPage();
 };
 
 class ClangdSettingsWidget : public QWidget

src/plugins/cppeditor/cppeditorplugin.cpp

@@ -179,11 +179,10 @@ public:
     CppEditorFactory m_cppEditorFactory;
 
     CppModelManager modelManager;
-    CppCodeModelSettings m_codeModelSettings;
     CppToolsSettings settings;
     CppFileSettings m_fileSettings;
     CppFileSettingsPage m_cppFileSettingsPage{&m_fileSettings};
-    CppCodeModelSettingsPage m_cppCodeModelSettingsPage{&m_codeModelSettings};
+    CppCodeModelSettingsPage m_cppCodeModelSettingsPage;
     CppCodeStyleSettingsPage m_cppCodeStyleSettingsPage;
     CppProjectUpdaterFactory m_cppProjectUpdaterFactory;
 };
@@ -212,7 +211,6 @@ CppEditorPlugin *CppEditorPlugin::instance()
 void CppEditorPlugin::initialize()
 {
     d = new CppEditorPluginPrivate;
-    d->m_codeModelSettings.fromSettings(ICore::settings());
 
     CppModelManager::registerJsExtension();
 
@@ -621,11 +619,6 @@ bool CppEditorPlugin::usePragmaOnce(Project *project)
     return fileSettings(project).headerPragmaOnce;
 }
 
-CppCodeModelSettings *CppEditorPlugin::codeModelSettings()
-{
-    return &d->m_codeModelSettings;
-}
-
 CppFileSettings CppEditorPlugin::fileSettings(Project *project)
 {
     if (!project)

src/plugins/cppeditor/cppeditorplugin.h

@@ -8,10 +8,7 @@
 namespace ProjectExplorer { class Project; }
 namespace Utils { class FilePath; }
 
-namespace CppEditor {
-class CppCodeModelSettings;
-
-namespace Internal {
+namespace CppEditor::Internal {
 
 class CppEditorPluginPrivate;
 class CppFileSettings;
@@ -39,7 +36,6 @@ public:
     void renameSymbolUnderCursor();
     void switchDeclarationDefinition();
 
-    CppCodeModelSettings *codeModelSettings();
     static CppFileSettings fileSettings(ProjectExplorer::Project *project);
 #ifdef WITH_TESTS
     static void setGlobalFileSettings(const CppFileSettings &settings);
@@ -64,5 +60,4 @@ private:
     CppEditorPluginPrivate *d = nullptr;
 };
 
-} // namespace Internal
-} // namespace CppEditor
+} // namespace CppEditor::Internal

src/plugins/cppeditor/cpptoolsreuse.cpp

@@ -338,7 +338,7 @@ CppCompletionAssistProcessor *getCppCompletionAssistProcessor()
 
 CppCodeModelSettings *codeModelSettings()
 {
-    return Internal::CppEditorPlugin::instance()->codeModelSettings();
+    return &cppCodeModelSettings();
 }
 
 int indexerFileSizeLimitInMb()