integrate qmlformat and improve formatter settings UX

- Add reformat action to trigger full document formatting via qmlformat
- Integrate reformat action into context menu and qmljstools menu
- Remove custom formatter command from preferences, default to
  qmlformat when LSP formatting fails
- Group tabSettings and other options under 'Built-In Formatter Settings'
  for clarity
- Move formatter selection to Code Style page with a new radio button
  for selection
- Ensure preview updates according to the selected formatter
- Populate qmlformat configuration widget automatically for Qt's built-in
code style option by running qmlformat --write-defaults.
- TabSettings is a data structure being considered by the text editor
while rewriting the formatted data. Overwrite tabSettings with the
values in the .qmlformat.ini.
- fix the issue of builtin formatter being not respecting the
current codestyle's tab settings.

Task-number: QTCREATORBUG-26602
Change-Id: I2ec1b4a69712eedfafab358aaabb25c6b43ffa8e
Reviewed-by: hjk <hjk@qt.io>
Reviewed-by: Sami Shalayel <sami.shalayel@qt.io>

src/plugins/qmljseditor/qmljseditordocument.cpp

@@ -19,11 +19,12 @@
 
 #include <projectexplorer/projectmanager.h>
 
+#include <qmljs/parser/qmljsast_p.h>
 #include <qmljstools/qmljsindenter.h>
 #include <qmljstools/qmljsmodelmanager.h>
 #include <qmljstools/qmljsqtstylecodeformatter.h>
 
-#include <qmljs/parser/qmljsast_p.h>
+#include <texteditor/tabsettings.h>
 
 #include <utils/fileutils.h>
 #include <utils/infobar.h>
@@ -466,6 +467,7 @@ QmlJSEditorDocumentPrivate::QmlJSEditorDocumentPrivate(QmlJSEditorDocument *pare
     : q(parent)
     , m_semanticHighlighter(new SemanticHighlighter(parent))
     , m_outlineModel(new QmlOutlineModel(parent))
+    , m_tabSettings(parent->TextDocument::tabSettings())
 {
     ModelManagerInterface *modelManager = ModelManagerInterface::instance();
 
@@ -838,5 +840,17 @@ void QmlJSEditorDocument::setSourcesWithCapabilities(
     d->setSourcesWithCapabilities(cap);
 }
 
+TextEditor::TabSettings QmlJSEditorDocument::tabSettings() const
+{
+    return d->m_tabSettings;
+}
+
+void QmlJSEditorDocument::setTabSettings(const TextEditor::TabSettings &tabSettings)
+{
+    if (tabSettings != d->m_tabSettings) {
+        d->m_tabSettings = tabSettings;
+        emit tabSettingsChanged();
+    }
+}
 
 } // QmlJSEditor

src/plugins/qmljseditor/qmljseditordocument.h

@@ -40,6 +40,8 @@ public:
 
     void setSourcesWithCapabilities(const LanguageServerProtocol::ServerCapabilities &cap);
 
+    virtual TextEditor::TabSettings tabSettings() const override;
+    void setTabSettings(const TextEditor::TabSettings &tabSettings);
 signals:
     void updateCodeWarnings(QmlJS::Document::Ptr doc);
     void semanticInfoUpdated(const QmlJSTools::SemanticInfo &semanticInfo);

src/plugins/qmljseditor/qmljseditordocument_p.h

@@ -6,6 +6,8 @@
 #include <languageserverprotocol/servercapabilities.h>
 #include <qmljs/qmljsdocument.h>
 #include <qmljstools/qmljssemanticinfo.h>
+#include <texteditor/tabsettings.h>
+#include <texteditor/textdocument.h>
 
 #include <QObject>
 #include <QTextLayout>
@@ -83,6 +85,7 @@ public:
                                  QmllsStatus::Source::EmbeddedCodeModel,
                                  QmllsStatus::Source::EmbeddedCodeModel,
                                  {}};
+    TextEditor::TabSettings m_tabSettings;
 };
 
 } // Internal

src/plugins/qmljseditor/qmljseditorplugin.cpp

@@ -16,6 +16,8 @@
 #include <qmljs/qmljsmodelmanagerinterface.h>
 #include <qmljs/qmljsreformatter.h>
 
+#include <qmljstools/qmlformatsettings.h>
+#include <qmljstools/qmljscodestylesettings.h>
 #include <qmljstools/qmljstoolsconstants.h>
 #include <qmljstools/qmljstoolssettings.h>
 
@@ -25,6 +27,7 @@
 #include <coreplugin/coreconstants.h>
 #include <coreplugin/editormanager/editormanager.h>
 #include <coreplugin/icore.h>
+#include <coreplugin/messagemanager.h>
 
 #include <extensionsystem/iplugin.h>
 
@@ -42,6 +45,7 @@
 #include <texteditor/texteditor.h>
 #include <texteditor/texteditorconstants.h>
 
+#include <utils/filepath.h>
 #include <utils/fsengine/fileiconprovider.h>
 #include <utils/macroexpander.h>
 #include <utils/mimeconstants.h>
@@ -54,6 +58,7 @@
 using namespace ProjectExplorer;
 using namespace Core;
 using namespace Utils;
+using namespace QmlJSTools;
 
 namespace QmlJSEditor::Internal {
 
@@ -70,7 +75,7 @@ public:
     Command *addToolAction(QAction *a, Context &context, Id id,
                            ActionContainer *c1, const QString &keySequence);
 
-    void reformatFile();
+    FormatResult reformatFile();
 
     QmlJS::JsonSchemaManager *jsonManager() { return &m_jsonManager;}
     QmlJSQuickFixAssistProvider *quickFixAssistProvider() { return &m_quickFixAssistProvider; }
@@ -140,11 +145,15 @@ QmlJSEditorPluginPrivate::QmlJSEditorPluginPrivate()
     connect(semanticScan, &QAction::triggered, this, &QmlJSEditorPluginPrivate::runSemanticScan);
     qmlToolsMenu->addAction(cmd);
 
-    m_reformatFileAction = new QAction(Tr::tr("Reformat File"), this);
-    cmd = ActionManager::registerAction(m_reformatFileAction,
-                                        Id("QmlJSEditor.ReformatFile"),
-                                        context);
-    connect(m_reformatFileAction, &QAction::triggered, this, &QmlJSEditorPluginPrivate::reformatFile);
+
+    m_reformatFileAction = ActionBuilder(this, TextEditor::Constants::REFORMAT_FILE)
+                             .setContext(context)
+                             .addOnTriggered([this] { reformatFile(); })
+                             .setDefaultKeySequence(QKeySequence(Tr::tr("Ctrl+Shift+;")))
+                             .setText(Tr::tr("Reformat Document"))
+                             .addToContainer(Core::Constants::M_EDIT_ADVANCED, Core::Constants::G_EDIT_FORMAT)
+                             .contextAction();
+    cmd = ActionManager::command(TextEditor::Constants::REFORMAT_FILE);
     qmlToolsMenu->addAction(cmd);
 
     QAction *inspectElementAction = new QAction(Tr::tr("Inspect API for Element Under Cursor"), this);
@@ -171,6 +180,9 @@ QmlJSEditorPluginPrivate::QmlJSEditorPluginPrivate()
     cmd = ActionManager::command(TextEditor::Constants::AUTO_INDENT_SELECTION);
     contextMenu->addAction(cmd);
 
+    cmd = ActionManager::command(TextEditor::Constants::REFORMAT_FILE);
+    contextMenu->addAction(cmd);
+
     cmd = ActionManager::command(TextEditor::Constants::UN_COMMENT_SELECTION);
     contextMenu->addAction(cmd);
 
@@ -188,35 +200,56 @@ QmlJS::JsonSchemaManager *jsonManager()
     return dd->jsonManager();
 }
 
-static void reformatByQmlFormat(QPointer<QmlJSEditorDocument> document)
+static void overrideTabSettings(QPointer<QmlJSEditorDocument> document)
 {
-    QString formatCommand = settings().formatCommand();
-    if (formatCommand.isEmpty())
-        formatCommand = settings().defaultFormatCommand();
-    const auto exe = FilePath::fromUserInput(globalMacroExpander()->expand(formatCommand));
-    const QString args = globalMacroExpander()->expand(
-        settings().formatCommandOptions());
-    const CommandLine commandLine(exe, args, CommandLine::Raw);
+    // Search .qmlformat.ini and read the tab settings from it
+    if (!document)
+        return;
+
+    TextEditor::TabSettings tabSettings = document->tabSettings();
+    QSettings settings(
+        QmlJSTools::QmlFormatSettings::currentQmlFormatIniFile(document->filePath()).toUrlishString(),
+        QSettings::IniFormat);
+
+    if (settings.contains("IndentWidth"))
+        tabSettings.m_indentSize = settings.value("IndentWidth").toInt();
+    if (settings.contains("UseTabs"))
+        tabSettings.m_tabPolicy = settings.value("UseTabs").toBool()
+                                      ? TextEditor::TabSettings::TabPolicy::TabsOnlyTabPolicy
+                                      : TextEditor::TabSettings::TabPolicy::SpacesOnlyTabPolicy;
+    document->setTabSettings(tabSettings);
+}
+
+static FormatResult reformatByQmlFormat(QPointer<QmlJSEditorDocument> document)
+{
+    const FilePath &qmlformatPath = QmlFormatSettings::instance().latestQmlFormatPath();
+    if (!qmlformatPath.isExecutableFile()) {
+        Core::MessageManager::writeSilently(
+            Tr::tr("QmlFormat not found."));
+        return FormatResult::Failed;
+    }
+    const CommandLine commandLine(qmlformatPath, {});
     TextEditor::Command command;
     command.setExecutable(commandLine.executable());
     command.setProcessing(TextEditor::Command::FileProcessing);
     command.addOptions(commandLine.splitArguments());
     command.addOption("--inplace");
     command.addOption("%file");
-
     if (!command.isValid())
-        return;
-
+        return FormatResult::Failed;
     const QList<Core::IEditor *> editors = Core::DocumentModel::editorsForDocument(document);
     if (editors.isEmpty())
-        return;
+        return FormatResult::Failed;
     IEditor *currentEditor = EditorManager::currentEditor();
     IEditor *editor = editors.contains(currentEditor) ? currentEditor : editors.first();
-    if (auto widget = TextEditor::TextEditorWidget::fromEditor(editor))
+    if (auto widget = TextEditor::TextEditorWidget::fromEditor(editor)) {
         TextEditor::formatEditor(widget, command);
+        return FormatResult::Success;
+    }
+    return FormatResult::Failed;
 }
 
-static void reformatByBuiltInFormatter(QPointer<QmlJSEditorDocument> document)
+static FormatResult reformatByBuiltInFormatter(QPointer<QmlJSEditorDocument> document)
 {
     QmlJS::Document::Ptr documentPtr = document->semanticInfo().document;
     QmlJS::Snapshot snapshot = QmlJS::ModelManagerInterface::instance()->snapshot();
@@ -224,7 +257,7 @@ static void reformatByBuiltInFormatter(QPointer<QmlJSEditorDocument> document)
     if (document->isSemanticInfoOutdated()) {
         QmlJS::Document::MutablePtr latestDocument;
 
-        const Utils::FilePath fileName = document->filePath();
+        const FilePath fileName = document->filePath();
         latestDocument = snapshot.documentFromSource(
             QString::fromUtf8(document->contents()),
             fileName,
@@ -235,14 +268,16 @@ static void reformatByBuiltInFormatter(QPointer<QmlJSEditorDocument> document)
     }
 
     if (!documentPtr->isParsedCorrectly())
-        return;
+        return FormatResult::Failed;
 
-    TextEditor::TabSettings tabSettings = document->tabSettings();
+    QmlJSTools::QmlJSCodeStylePreferences *codeStyle
+        = QmlJSTools::QmlJSToolsSettings::globalCodeStyle();
+    TextEditor::TabSettings tabSettings = codeStyle->currentTabSettings();
     const QString newText = QmlJS::reformat(
         documentPtr,
         tabSettings.m_indentSize,
         tabSettings.m_tabSize,
-        QmlJSTools::QmlJSToolsSettings::globalCodeStyle()->currentCodeStyleSettings().lineLength);
+        codeStyle->currentCodeStyleSettings().lineLength);
     auto ed = qobject_cast<TextEditor::BaseTextEditor *>(EditorManager::currentEditor());
     if (ed) {
         TextEditor::updateEditorText(ed->editorWidget(), newText);
@@ -252,45 +287,98 @@ static void reformatByBuiltInFormatter(QPointer<QmlJSEditorDocument> document)
         tc.movePosition(QTextCursor::End, QTextCursor::KeepAnchor);
         tc.insertText(newText);
     }
+    return FormatResult::Success;
 }
 
-static bool reformatUsingLanguageServer(QPointer<QmlJSEditorDocument> document)
+static FormatResult reformatUsingLanguageServer(QPointer<QmlJSEditorDocument> document)
 {
     if (!document)
-        return false;
+        return FormatResult::Failed;
 
     if (!document->formatter())
-        return false;
+        return FormatResult::Failed;
 
     TextEditor::BaseTextEditor *editor = qobject_cast<TextEditor::BaseTextEditor *>(
         EditorManager::currentEditor());
     if (!editor)
-        return false;
+        return FormatResult::Failed;
 
     TextEditor::TextEditorWidget *editorWidget = editor->editorWidget();
     if (!editorWidget)
-        return false;
+        return FormatResult::Failed;
 
+    overrideTabSettings(document);
     document->setFormatterMode(TextEditor::Formatter::FormatMode::FullDocument);
     editorWidget->autoFormat();
-
-    return true;
+    return FormatResult::Success;
 }
 
-void QmlJSEditorPluginPrivate::reformatFile()
+static FormatResult reformatByCustomFormatter(
+    QPointer<QmlJSEditorDocument> document, const QmlJSTools::QmlJSCodeStyleSettings &settings)
 {
-    if (!m_currentDocument)
-        return;
-
-    if (reformatUsingLanguageServer(m_currentDocument))
-        return;
-
-    if (settings().useCustomFormatCommand()) {
-       reformatByQmlFormat(m_currentDocument);
-       return;
+    const FilePath &formatter = settings.customFormatterPath;
+    const QStringList &args = settings.customFormatterArguments.split(" ", Qt::SkipEmptyParts);
+    if (!formatter.isExecutableFile()) {
+        MessageManager::writeSilently(
+            Tr::tr("Custom Formatter path not found."));
+        return FormatResult::Failed;
+    }
+    const CommandLine commandLine(formatter, args);
+    TextEditor::Command command;
+    command.setExecutable(commandLine.executable());
+    command.setProcessing(TextEditor::Command::FileProcessing);
+    command.addOptions(commandLine.splitArguments());
+    command.addOption("--inplace");
+    command.addOption("%file");
+    if (!command.isValid())
+        return FormatResult::Failed;
+    const QList<Core::IEditor *> editors = Core::DocumentModel::editorsForDocument(document);
+    if (editors.isEmpty())
+        return FormatResult::Failed;
+    IEditor *currentEditor = EditorManager::currentEditor();
+    IEditor *editor = editors.contains(currentEditor) ? currentEditor : editors.first();
+    if (auto widget = TextEditor::TextEditorWidget::fromEditor(editor)) {
+        TextEditor::formatEditor(widget, command);
+        return FormatResult::Success;
+    }
+    return FormatResult::Failed;
 }
 
-    reformatByBuiltInFormatter(m_currentDocument);
+FormatResult QmlJSEditorPluginPrivate::reformatFile()
+{
+    if (!m_currentDocument) {
+        MessageManager::writeSilently(Tr::tr("Error: No current document to format."));
+        return FormatResult::Failed;
+    }
+
+    const QmlJSCodeStyleSettings settings
+        = QmlJSToolsSettings::globalCodeStyle()->currentCodeStyleSettings();
+
+    const auto tryReformat = [this](auto formatterFunction) {
+        const FormatResult result = formatterFunction(m_currentDocument);
+        if (result != FormatResult::Success) {
+            MessageManager::writeSilently(
+                Tr::tr("Error: Formatting failed with the selected formatter."));
+        }
+        return result;
+    };
+
+    switch (settings.formatter) {
+    case QmlJSCodeStyleSettings::Formatter::QmlFormat:
+        return tryReformat([](auto doc) {
+            return reformatUsingLanguageServer(doc) == FormatResult::Success
+                       ? FormatResult::Success
+                       : reformatByQmlFormat(doc);
+        });
+
+    case QmlJSCodeStyleSettings::Formatter::Custom:
+        return tryReformat(
+            [&settings](auto doc) { return reformatByCustomFormatter(doc, settings); });
+
+    case QmlJSCodeStyleSettings::Formatter::Builtin:
+    default:
+        return tryReformat([](auto doc) { return reformatByBuiltInFormatter(doc); });
+    }
 }
 
 Command *QmlJSEditorPluginPrivate::addToolAction(QAction *a,

src/plugins/qmljseditor/qmljseditorplugin.h

@@ -16,4 +16,9 @@ void setupQmlJSEditor();
 void inspectElement();
 void showContextPane();
 
+enum class FormatResult {
+    Success,
+    Failed
+};
+
 } // QmlJSEditor::Internal

src/plugins/qmljseditor/qmljseditorsettings.cpp

@@ -63,15 +63,10 @@ const char QML_CONTEXTPANE_KEY[] = "QmlJSEditor.ContextPaneEnabled";
 const char QML_CONTEXTPANEPIN_KEY[] = "QmlJSEditor.ContextPanePinned";
 const char FOLD_AUX_DATA[] = "QmlJSEditor.FoldAuxData";
 const char UIQML_OPEN_MODE[] = "QmlJSEditor.openUiQmlMode";
-const char FORMAT_COMMAND[] = "QmlJSEditor.formatCommand";
-const char FORMAT_COMMAND_OPTIONS[] = "QmlJSEditor.formatCommandOptions";
-const char CUSTOM_COMMAND[] = "QmlJSEditor.useCustomFormatCommand";
 const char CUSTOM_ANALYZER[] = "QmlJSEditor.useCustomAnalyzer";
 const char DISABLED_MESSAGES[] = "QmlJSEditor.disabledMessages";
 const char DISABLED_MESSAGES_NONQUICKUI[] = "QmlJSEditor.disabledMessagesNonQuickUI";
 const char QDS_COMMAND[] = "QmlJSEditor.qdsCommand";
-const char DEFAULT_CUSTOM_FORMAT_COMMAND[]
-    = "%{CurrentDocument:Project:QT_HOST_BINS}/qmlformat%{HostOs:ExecutableSuffix}";
 const char SETTINGS_PAGE[] = "C.QmlJsEditing";
 
 QmlJsEditingSettings &settings()
@@ -142,19 +137,6 @@ QmlJsEditingSettings::QmlJsEditingSettings()
     uiQmlOpenMode.addOption({Tr::tr("Qt Design Studio"), {}, Core::Constants::MODE_DESIGN});
     uiQmlOpenMode.addOption({Tr::tr("Qt Creator"), {}, Core::Constants::MODE_EDIT});
 
-    useCustomFormatCommand.setSettingsKey(group, CUSTOM_COMMAND);
-    useCustomFormatCommand.setLabelText(
-        Tr::tr("Use custom command instead of built-in formatter"));
-
-    formatCommand.setSettingsKey(group, FORMAT_COMMAND);
-    formatCommand.setDisplayStyle(StringAspect::LineEditDisplay);
-    formatCommand.setPlaceHolderText(defaultFormatCommand());
-    formatCommand.setLabelText(Tr::tr("Command:"));
-
-    formatCommandOptions.setSettingsKey(group, FORMAT_COMMAND_OPTIONS);
-    formatCommandOptions.setDisplayStyle(StringAspect::LineEditDisplay);
-    formatCommandOptions.setLabelText(Tr::tr("Arguments:"));
-
     useCustomAnalyzer.setSettingsKey(group, CUSTOM_ANALYZER);
     useCustomAnalyzer.setLabelText(Tr::tr("Use customized static analyzer"));
 
@@ -174,15 +156,6 @@ QmlJsEditingSettings::QmlJsEditingSettings()
     qdsCommand.setVisible(false);
 
     readSettings();
-
-    autoFormatOnlyCurrentProject.setEnabler(&autoFormatOnSave);
-    formatCommand.setEnabler(&useCustomFormatCommand);
-    formatCommandOptions.setEnabler(&useCustomFormatCommand);
-}
-
-QString QmlJsEditingSettings::defaultFormatCommand() const
-{
-    return DEFAULT_CUSTOM_FORMAT_COMMAND;
 }
 
 FilePath QmlJsEditingSettings::defaultQdsCommand() const
@@ -285,15 +258,10 @@ public:
         Column {
             Group {
                 bindTo(&formattingGroup),
-                title(Tr::tr("Automatic Formatting on File Save")),
+                title(Tr::tr("Formatting")),
                 Column {
                     s.autoFormatOnSave,
                     s.autoFormatOnlyCurrentProject,
-                    s.useCustomFormatCommand,
-                    Form {
-                        s.formatCommand, br,
-                        s.formatCommandOptions
-                    }
                 },
             },
             Group {

src/plugins/qmljseditor/qmljseditorsettings.h

@@ -20,7 +20,6 @@ class QmlJsEditingSettings final : public Utils::AspectContainer
 public:
     QmlJsEditingSettings();
 
-    QString defaultFormatCommand() const;
     Utils::FilePath defaultQdsCommand() const;
 
     Utils::BoolAspect enableContextPane{this};
@@ -28,11 +27,8 @@ public:
     Utils::BoolAspect autoFormatOnSave{this};
     Utils::BoolAspect autoFormatOnlyCurrentProject{this};
     Utils::BoolAspect foldAuxData{this};
-    Utils::BoolAspect useCustomFormatCommand{this};
     Utils::BoolAspect useCustomAnalyzer{this};
     Utils::SelectionAspect uiQmlOpenMode{this};
-    Utils::StringAspect formatCommand{this};
-    Utils::StringAspect formatCommandOptions{this};
     Utils::IntegersAspect disabledMessages{this};
     Utils::IntegersAspect disabledMessagesForNonQuickUi{this};
     Utils::FilePathAspect qdsCommand{this};

src/plugins/qmljstools/CMakeLists.txt

@@ -7,8 +7,10 @@ add_qtc_plugin(QmlJSTools
     qmljsbundleprovider.cpp qmljsbundleprovider.h
     qmljscodestylepreferenceswidget.cpp qmljscodestylepreferenceswidget.h
     qmljscodestylesettings.cpp qmljscodestylesettings.h
-    qmljscodestylesettingswidget.cpp qmljscodestylesettingswidget.h
     qmljscodestylesettingspage.cpp qmljscodestylesettingspage.h
+    qmljscustomformatterwidget.cpp qmljscustomformatterwidget.h
+    qmlformatsettingswidget.cpp qmlformatsettingswidget.h
+    qmljsformatterselectionwidget.cpp qmljsformatterselectionwidget.h
     qmljsfunctionfilter.cpp qmljsfunctionfilter.h
     qmljsindenter.cpp qmljsindenter.h
     qmljsmodelmanager.cpp qmljsmodelmanager.h

src/plugins/qmljstools/qmlformatsettingswidget.cpp

@@ -0,0 +1,98 @@
+// Copyright (C) 2025 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "qmlformatsettingswidget.h"
+#include "qmljsformatterselectionwidget.h"
+#include "qmlformatsettings.h"
+#include "qmljstoolstr.h"
+
+#include <texteditor/snippets/snippeteditor.h>
+#include <utils/layoutbuilder.h>
+
+#include <QVBoxLayout>
+
+namespace QmlJSTools {
+
+QmlFormatSettingsWidget::QmlFormatSettingsWidget(
+    QWidget *parent, FormatterSelectionWidget *selection)
+    : QmlCodeStyleWidgetBase(parent)
+    , m_qmlformatConfigTextEdit(std::make_unique<TextEditor::SnippetEditorWidget>())
+    , m_formatterSelectionWidget(selection)
+{
+    QSizePolicy sp(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
+    sp.setHorizontalStretch(1);
+    m_qmlformatConfigTextEdit->setSizePolicy(sp);
+
+    using namespace Layouting;
+    // clang-format off
+    Column {
+        Group {
+            title(Tr::tr("Global qmlformat Configuration")),
+            Column {
+                m_qmlformatConfigTextEdit.get(),
+            },
+        },
+        noMargin
+    }.attachTo(this);
+    // clang-format on
+
+    connect(
+        m_qmlformatConfigTextEdit.get(),
+        &TextEditor::SnippetEditorWidget::textChanged,
+        this,
+        &QmlFormatSettingsWidget::slotSettingsChanged);
+}
+
+void QmlFormatSettingsWidget::setCodeStyleSettings(const QmlJSCodeStyleSettings &s)
+{
+    QSignalBlocker blocker(this);
+    if (s.qmlformatIniContent != m_qmlformatConfigTextEdit->toPlainText())
+        m_qmlformatConfigTextEdit->setPlainText(s.qmlformatIniContent);
+}
+
+void QmlFormatSettingsWidget::setPreferences(QmlJSCodeStylePreferences *preferences)
+{
+    if (m_preferences == preferences)
+        return; // nothing changes
+
+    slotCurrentPreferencesChanged(preferences);
+
+    // cleanup old
+    if (m_preferences) {
+        disconnect(m_preferences, &QmlJSCodeStylePreferences::currentValueChanged, this, nullptr);
+        disconnect(m_preferences, &QmlJSCodeStylePreferences::currentPreferencesChanged,
+                   this, &QmlFormatSettingsWidget::slotCurrentPreferencesChanged);
+    }
+    m_preferences = preferences;
+    // fillup new
+    if (m_preferences) {
+        setCodeStyleSettings(m_preferences->currentCodeStyleSettings());
+        connect(m_preferences, &QmlJSCodeStylePreferences::currentValueChanged, this, [this] {
+                this->setCodeStyleSettings(m_preferences->currentCodeStyleSettings());
+        });
+        connect(m_preferences, &QmlJSCodeStylePreferences::currentPreferencesChanged,
+                this, &QmlFormatSettingsWidget::slotCurrentPreferencesChanged);
+    }
+}
+
+void QmlFormatSettingsWidget::slotCurrentPreferencesChanged(
+    TextEditor::ICodeStylePreferences *preferences)
+{
+    auto *current = dynamic_cast<QmlJSCodeStylePreferences *>(
+        preferences ? preferences->currentPreferences() : nullptr);
+    const bool enableWidgets = current && !current->isReadOnly() && m_formatterSelectionWidget
+                               && m_formatterSelectionWidget->selection().value()
+                                      == QmlCodeStyleWidgetBase::QmlFormat;
+    setEnabled(enableWidgets);
+}
+
+void QmlFormatSettingsWidget::slotSettingsChanged()
+{
+    QmlJSCodeStyleSettings settings = m_preferences ? m_preferences->currentCodeStyleSettings()
+    : QmlJSCodeStyleSettings::currentGlobalCodeStyle();
+    settings.qmlformatIniContent = m_qmlformatConfigTextEdit->toPlainText();
+    QmlFormatSettings::instance().globalQmlFormatIniFile().writeFileContents(settings.qmlformatIniContent.toUtf8());
+    emit settingsChanged(settings);
+}
+
+} // namespace QmlJSTools

src/plugins/qmljstools/qmlformatsettingswidget.h

@@ -0,0 +1,34 @@
+// Copyright (C) 2025 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include "qmljsformatterselectionwidget.h"
+#include "qmljscodestylesettings.h"
+
+#include <texteditor/snippets/snippeteditor.h>
+
+#include <memory>
+#include <QWidget>
+
+namespace QmlJSTools {
+class FormatterSelectionWidget;
+
+class QmlFormatSettingsWidget : public QmlCodeStyleWidgetBase
+{
+public:
+    explicit QmlFormatSettingsWidget(
+        QWidget *parent = nullptr,
+        FormatterSelectionWidget *selection = nullptr);
+    void setCodeStyleSettings(const QmlJSCodeStyleSettings &s) override;
+    void setPreferences(QmlJSCodeStylePreferences *preferences) override;
+    void slotCurrentPreferencesChanged(TextEditor::ICodeStylePreferences* preferences) override;
+
+private:
+    void slotSettingsChanged();
+    std::unique_ptr<TextEditor::SnippetEditorWidget> m_qmlformatConfigTextEdit;
+    FormatterSelectionWidget *m_formatterSelectionWidget = nullptr;
+    QmlJSCodeStylePreferences *m_preferences = nullptr;
+};
+
+} // namespace QmlJSTools

src/plugins/qmljstools/qmljscodestylepreferenceswidget.cpp

@@ -4,23 +4,58 @@
 #include "qmljscodestylepreferenceswidget.h"
 
 #include "qmljscodestylesettings.h"
-#include "qmljscodestylesettingswidget.h"
+#include "qmljsformatterselectionwidget.h"
+#include "qmljstoolstr.h"
+
+#include <texteditor/simplecodestylepreferenceswidget.h>
+#include <texteditor/texteditor.h>
+#include <utils/layoutbuilder.h>
+#include <utils/aspects.h>
 
 #include <QLabel>
 #include <QVBoxLayout>
 
+using namespace TextEditor;
 namespace QmlJSTools {
 
-QmlJSCodeStylePreferencesWidget::QmlJSCodeStylePreferencesWidget(QWidget *parent) :
-      QWidget(parent)
+BuiltinFormatterSettingsWidget::BuiltinFormatterSettingsWidget(QWidget *parent, FormatterSelectionWidget *selection)
+    : QmlCodeStyleWidgetBase(parent)
+    , m_tabSettingsWidget(new TextEditor::TabSettingsWidget)
+    , m_formatterSelectionWidget(selection)
 {
-    m_codeStyleSettingsWidget = new QmlJSCodeStyleSettingsWidget(this);
-    auto layout = new QVBoxLayout(this);
-    layout->addWidget(m_codeStyleSettingsWidget);
-    layout->setContentsMargins(QMargins());
+    m_lineLength.setRange(0, 999);
+    m_tabSettingsWidget->setParent(this);
+
+    using namespace Layouting;
+    Column {
+        Group {
+            title(Tr::tr("Builtin Formatter Settings")),
+            Column {
+                m_tabSettingsWidget,
+                Group {
+                    title(Tr::tr("Other Settings")),
+                    Form {
+                        Tr::tr("Line Length:"), m_lineLength, br
+                    }
+                }
+            }
+        }
+    }.attachTo(this);
+
+    connect(
+        &m_lineLength,
+        &Utils::IntegerAspect::changed,
+        this,
+        &BuiltinFormatterSettingsWidget::slotSettingsChanged);
 }
 
-void QmlJSCodeStylePreferencesWidget::setPreferences(QmlJSCodeStylePreferences *preferences)
+void BuiltinFormatterSettingsWidget::setCodeStyleSettings(const QmlJSCodeStyleSettings &settings)
+{
+    QSignalBlocker blocker(this);
+    m_lineLength.setValue(settings.lineLength);
+}
+
+void BuiltinFormatterSettingsWidget::setPreferences(QmlJSCodeStylePreferences *preferences)
 {
     if (m_preferences == preferences)
         return; // nothing changes
@@ -31,41 +66,58 @@ void QmlJSCodeStylePreferencesWidget::setPreferences(QmlJSCodeStylePreferences *
     if (m_preferences) {
         disconnect(m_preferences, &QmlJSCodeStylePreferences::currentValueChanged, this, nullptr);
         disconnect(m_preferences, &QmlJSCodeStylePreferences::currentPreferencesChanged,
-                   this, &QmlJSCodeStylePreferencesWidget::slotCurrentPreferencesChanged);
-        disconnect(m_codeStyleSettingsWidget, &QmlJSCodeStyleSettingsWidget::settingsChanged,
-                   this, &QmlJSCodeStylePreferencesWidget::slotSettingsChanged);
+                   this, &BuiltinFormatterSettingsWidget::slotCurrentPreferencesChanged);
+        disconnect(m_preferences, &ICodeStylePreferences::currentTabSettingsChanged,
+                    m_tabSettingsWidget, &TabSettingsWidget::setTabSettings);
+        disconnect(m_tabSettingsWidget, &TabSettingsWidget::settingsChanged,
+                    this, &BuiltinFormatterSettingsWidget::slotTabSettingsChanged);
     }
     m_preferences = preferences;
     // fillup new
     if (m_preferences) {
-        m_codeStyleSettingsWidget->setCodeStyleSettings(m_preferences->currentCodeStyleSettings());
-
+        setCodeStyleSettings(m_preferences->currentCodeStyleSettings());
         connect(m_preferences, &QmlJSCodeStylePreferences::currentValueChanged, this, [this] {
-            m_codeStyleSettingsWidget->setCodeStyleSettings(m_preferences->currentCodeStyleSettings());
+            setCodeStyleSettings(m_preferences->currentCodeStyleSettings());
         });
         connect(m_preferences, &QmlJSCodeStylePreferences::currentPreferencesChanged,
-                this, &QmlJSCodeStylePreferencesWidget::slotCurrentPreferencesChanged);
-        connect(m_codeStyleSettingsWidget, &QmlJSCodeStyleSettingsWidget::settingsChanged,
-                this, &QmlJSCodeStylePreferencesWidget::slotSettingsChanged);
+                this, &BuiltinFormatterSettingsWidget::slotCurrentPreferencesChanged);
+                m_tabSettingsWidget->setTabSettings(m_preferences->currentTabSettings());
+        connect(m_preferences, &ICodeStylePreferences::currentTabSettingsChanged,
+                m_tabSettingsWidget, &TabSettingsWidget::setTabSettings);
+        connect(m_tabSettingsWidget, &TabSettingsWidget::settingsChanged,
+                this, &BuiltinFormatterSettingsWidget::slotTabSettingsChanged);
     }
 }
 
-void QmlJSCodeStylePreferencesWidget::slotCurrentPreferencesChanged(TextEditor::ICodeStylePreferences *preferences)
+void BuiltinFormatterSettingsWidget::slotCurrentPreferencesChanged(
+    TextEditor::ICodeStylePreferences *preferences)
 {
-    m_codeStyleSettingsWidget->setEnabled(preferences && preferences->currentPreferences() &&
-                                          !preferences->currentPreferences()->isReadOnly());
+    QmlJSCodeStylePreferences *current = dynamic_cast<QmlJSCodeStylePreferences *>(
+        preferences ? preferences->currentPreferences() : nullptr);
+    const bool enableWidgets = current && !current->isReadOnly() && m_formatterSelectionWidget
+                               && m_formatterSelectionWidget->selection().value()
+                                      == QmlCodeStyleWidgetBase::Builtin;
+    setEnabled(enableWidgets);
 }
 
-void QmlJSCodeStylePreferencesWidget::slotSettingsChanged(const QmlJSCodeStyleSettings &settings)
+void BuiltinFormatterSettingsWidget::slotSettingsChanged()
+{
+    QmlJSCodeStyleSettings settings = m_preferences ? m_preferences->currentCodeStyleSettings()
+                                               : QmlJSCodeStyleSettings::currentGlobalCodeStyle();
+    settings.lineLength = m_lineLength.value();
+    emit settingsChanged(settings);
+}
+
+void BuiltinFormatterSettingsWidget::slotTabSettingsChanged(const TextEditor::TabSettings &settings)
 {
     if (!m_preferences)
         return;
 
-    QmlJSCodeStylePreferences *current = dynamic_cast<QmlJSCodeStylePreferences*>(m_preferences->currentPreferences());
+    ICodeStylePreferences *current = m_preferences->currentPreferences();
     if (!current)
         return;
 
-    current->setCodeStyleSettings(settings);
+    current->setTabSettings(settings);
 }
 
 } // namespace QmlJSTools

src/plugins/qmljstools/qmljscodestylepreferenceswidget.h

@@ -3,30 +3,35 @@
 
 #pragma once
 
-#include "qmljstools_global.h"
-
 #include "qmljscodestylesettings.h"
+#include "qmljsformatterselectionwidget.h"
+
+#include <texteditor/tabsettingswidget.h>
+#include <utils/aspects.h>
 
 #include <QWidget>
 
+QT_BEGIN_NAMESPACE
+class QSpinBox;
+QT_END_NAMESPACE
 namespace QmlJSTools {
-class QmlJSCodeStyleSettingsWidget;
 
-class QMLJSTOOLS_EXPORT QmlJSCodeStylePreferencesWidget : public QWidget
+class BuiltinFormatterSettingsWidget : public QmlCodeStyleWidgetBase
 {
-    Q_OBJECT
-
 public:
-    explicit QmlJSCodeStylePreferencesWidget(QWidget *parent = nullptr);
-
-    void setPreferences(QmlJSCodeStylePreferences *tabPreferences);
+    explicit BuiltinFormatterSettingsWidget(QWidget *parent, FormatterSelectionWidget *selection);
+    void setCodeStyleSettings(const QmlJSCodeStyleSettings &settings) override;
+    void setPreferences(QmlJSCodeStylePreferences *tabPreferences) override;
+    void slotCurrentPreferencesChanged(TextEditor::ICodeStylePreferences* preferences) override;
 
 private:
-    void slotCurrentPreferencesChanged(TextEditor::ICodeStylePreferences* preferences);
-    void slotSettingsChanged(const QmlJSCodeStyleSettings &settings);
+    void slotSettingsChanged();
+    void slotTabSettingsChanged(const TextEditor::TabSettings &settings);
 
-    QmlJSCodeStyleSettingsWidget *m_codeStyleSettingsWidget;
+    Utils::IntegerAspect m_lineLength;
+    TextEditor::TabSettingsWidget *m_tabSettingsWidget;
     QmlJSCodeStylePreferences *m_preferences = nullptr;
+    FormatterSelectionWidget *m_formatterSelectionWidget;
 };
 
 } // namespace QmlJSTools

src/plugins/qmljstools/qmljscodestylesettings.cpp

@@ -18,9 +18,12 @@
 #include <utils/qtcassert.h>
 
 static const char lineLengthKey[] = "LineLength";
+static const char qmlformatIniContentKey[] = "QmlFormatIniContent";
+static const char formatterKey[] = "Formatter";
+static const char customFormatterPathKey[] = "CustomFormatterPath";
+static const char customFormatterArgumentsKey[] = "CustomFormatterArguments";
 
 using namespace Utils;
-
 namespace QmlJSTools {
 
 // QmlJSCodeStyleSettings
@@ -30,18 +33,28 @@ QmlJSCodeStyleSettings::QmlJSCodeStyleSettings() = default;
 Store QmlJSCodeStyleSettings::toMap() const
 {
     return {
-        {lineLengthKey, lineLength}
+        {formatterKey, formatter},
+        {lineLengthKey, lineLength},
+        {qmlformatIniContentKey, qmlformatIniContent},
+        {customFormatterPathKey, customFormatterPath.toUrlishString()},
+        {customFormatterArgumentsKey, customFormatterArguments}
     };
 }
 
 void QmlJSCodeStyleSettings::fromMap(const Store &map)
 {
     lineLength = map.value(lineLengthKey, lineLength).toInt();
+    qmlformatIniContent = map.value(qmlformatIniContentKey, qmlformatIniContent).toString();
+    formatter = static_cast<Formatter>(map.value(formatterKey, formatter).toInt());
+    customFormatterPath = Utils::FilePath::fromString(map.value(customFormatterPathKey).toString());
+    customFormatterArguments = map.value(customFormatterArgumentsKey).toString();
 }
 
 bool QmlJSCodeStyleSettings::equals(const QmlJSCodeStyleSettings &rhs) const
 {
-    return lineLength == rhs.lineLength;
+    return lineLength == rhs.lineLength && qmlformatIniContent == rhs.qmlformatIniContent
+           && formatter == rhs.formatter && customFormatterPath == rhs.customFormatterPath
+           && customFormatterArguments == rhs.customFormatterArguments;
 }
 
 QmlJSCodeStyleSettings QmlJSCodeStyleSettings::currentGlobalCodeStyle()

src/plugins/qmljstools/qmljscodestylesettings.h

@@ -7,6 +7,7 @@
 
 #include <texteditor/icodestylepreferences.h>
 
+#include <utils/filepath.h>
 #include <utils/store.h>
 
 namespace TextEditor { class TabSettings; }
@@ -19,7 +20,17 @@ class QMLJSTOOLS_EXPORT QmlJSCodeStyleSettings
 public:
     QmlJSCodeStyleSettings();
 
+    enum Formatter {
+        Builtin,
+        QmlFormat,
+        Custom
+    };
+
     int lineLength = 80;
+    QString qmlformatIniContent;
+    Formatter formatter = Builtin;
+    Utils::FilePath customFormatterPath;
+    QString customFormatterArguments;
 
     Utils::Store toMap() const;
     void fromMap(const Utils::Store &map);

src/plugins/qmljstools/qmljscodestylesettingspage.cpp

@@ -3,64 +3,112 @@
 
 #include "qmljscodestylesettingspage.h"
 
+#include "qmlformatsettings.h"
+#include "qmlformatsettingswidget.h"
 #include "qmljscodestylepreferenceswidget.h"
 #include "qmljscodestylesettings.h"
+#include "qmljscustomformatterwidget.h"
+#include "qmljsformatterselectionwidget.h"
 #include "qmljsqtstylecodeformatter.h"
 #include "qmljstoolsconstants.h"
 #include "qmljstoolssettings.h"
 #include "qmljstoolstr.h"
 
 #include <coreplugin/icore.h>
+#include <coreplugin/messagemanager.h>
 #include <extensionsystem/pluginmanager.h>
+#include <qmljseditor/qmljseditorconstants.h>
 #include <texteditor/codestyleeditor.h>
+#include <texteditor/command.h>
 #include <texteditor/displaysettings.h>
 #include <texteditor/fontsettings.h>
+#include <texteditor/formattexteditor.h>
 #include <texteditor/icodestylepreferencesfactory.h>
 #include <texteditor/simplecodestylepreferenceswidget.h>
 #include <texteditor/snippets/snippeteditor.h>
 #include <texteditor/snippets/snippetprovider.h>
 #include <texteditor/tabsettings.h>
 #include <texteditor/texteditorsettings.h>
+#include <utils/commandline.h>
+#include <utils/filepath.h>
 #include <utils/layoutbuilder.h>
-#include <qmljseditor/qmljseditorconstants.h>
 
 #include <QTextStream>
 #include <QVBoxLayout>
+#include <QStandardPaths>
 
 using namespace TextEditor;
-
+using namespace QmlJSTools;
 namespace QmlJSTools::Internal {
 
+constexpr int BuiltinFormatterIndex = QmlCodeStyleWidgetBase::Builtin;
+constexpr int QmlFormatIndex = QmlCodeStyleWidgetBase::QmlFormat;
+constexpr int CustomFormatterIndex = QmlCodeStyleWidgetBase::Custom;
+
 // QmlJSCodeStylePreferencesWidget
 
 QmlJSCodeStylePreferencesWidget::QmlJSCodeStylePreferencesWidget(
     const QString &previewText, QWidget *parent)
     : TextEditor::CodeStyleEditorWidget(parent)
+    , m_formatterSelectionWidget(new FormatterSelectionWidget(this))
+    , m_formatterSettingsStack(new QStackedWidget(this))
 {
-    m_tabPreferencesWidget = new SimpleCodeStylePreferencesWidget;
-    m_codeStylePreferencesWidget = new QmlJSTools::QmlJSCodeStylePreferencesWidget;
-    m_previewTextEdit = new SnippetEditorWidget;
+    m_formatterSettingsStack->insertWidget(BuiltinFormatterIndex, new BuiltinFormatterSettingsWidget(this, m_formatterSelectionWidget));
+    m_formatterSettingsStack->insertWidget(QmlFormatIndex, new QmlFormatSettingsWidget(this, m_formatterSelectionWidget));
+    m_formatterSettingsStack->insertWidget(CustomFormatterIndex, new CustomFormatterWidget(this, m_formatterSelectionWidget));
+
+    for (const auto &formatterWidget :
+         m_formatterSettingsStack->findChildren<QmlCodeStyleWidgetBase *>()) {
+        connect(
+            formatterWidget,
+            &QmlCodeStyleWidgetBase::settingsChanged,
+            this,
+            &QmlJSCodeStylePreferencesWidget::slotSettingsChanged);
+    }
+
+    const int index = m_formatterSelectionWidget->selection().value();
+    m_formatterSettingsStack->setCurrentIndex(index);
+
+    m_previewTextEdit = new SnippetEditorWidget(this);
     m_previewTextEdit->setPlainText(previewText);
     QSizePolicy sp(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding);
     sp.setHorizontalStretch(1);
     m_previewTextEdit->setSizePolicy(sp);
-
     decorateEditor(TextEditorSettings::fontSettings());
 
+    connect(
+        TextEditorSettings::instance(),
+        &TextEditorSettings::fontSettingsChanged,
+        this,
+        &QmlJSCodeStylePreferencesWidget::decorateEditor);
+
+    connect(
+        m_formatterSelectionWidget,
+        &FormatterSelectionWidget::settingsChanged,
+        [this](const QmlJSCodeStyleSettings &settings) {
+            int index = m_formatterSelectionWidget->selection().volatileValue();
+            if (index < 0 || index >= static_cast<int>(m_formatterSettingsStack->count()))
+                return;
+
+            m_formatterSettingsStack->setCurrentIndex(index);
+            if (auto *current = dynamic_cast<QmlCodeStyleWidgetBase *>(
+                    m_formatterSettingsStack->widget(index))) {
+                current->slotCurrentPreferencesChanged(m_preferences);
+            }
+            slotSettingsChanged(settings);
+        });
+
     using namespace Layouting;
     Row {
         Column {
-            m_tabPreferencesWidget,
-            m_codeStylePreferencesWidget,
-            st,
+            m_formatterSelectionWidget, br,
+            m_formatterSettingsStack,
+            st
         },
         m_previewTextEdit,
         noMargin
     }.attachTo(this);
 
-    connect(TextEditorSettings::instance(), &TextEditorSettings::fontSettingsChanged,
-       this, &QmlJSCodeStylePreferencesWidget::decorateEditor);
-
     setVisualizeWhitespace(true);
 
     updatePreview();
@@ -69,14 +117,20 @@ QmlJSCodeStylePreferencesWidget::QmlJSCodeStylePreferencesWidget(
 void QmlJSCodeStylePreferencesWidget::setPreferences(QmlJSCodeStylePreferences *preferences)
 {
     m_preferences = preferences;
-    m_tabPreferencesWidget->setPreferences(preferences);
-    m_codeStylePreferencesWidget->setPreferences(preferences);
+    m_formatterSelectionWidget->setPreferences(preferences);
+    for (const auto &formatterWidget :
+         m_formatterSettingsStack->findChildren<QmlCodeStyleWidgetBase *>()) {
+        formatterWidget->setPreferences(preferences);
+    }
     if (m_preferences)
     {
         connect(m_preferences, &ICodeStylePreferences::currentTabSettingsChanged,
-                this, &QmlJSCodeStylePreferencesWidget::slotSettingsChanged);
+                this, &QmlJSCodeStylePreferencesWidget::updatePreview);
         connect(m_preferences, &QmlJSCodeStylePreferences::currentValueChanged,
-                this, &QmlJSCodeStylePreferencesWidget::slotSettingsChanged);
+                [this]{
+                    m_formatterSettingsStack->setCurrentIndex(m_formatterSelectionWidget->selection().value());
+                    updatePreview();
+                });
     }
     updatePreview();
 }
@@ -95,12 +149,36 @@ void QmlJSCodeStylePreferencesWidget::setVisualizeWhitespace(bool on)
     m_previewTextEdit->setDisplaySettings(displaySettings);
 }
 
-void QmlJSCodeStylePreferencesWidget::slotSettingsChanged()
+void QmlJSCodeStylePreferencesWidget::slotSettingsChanged(const QmlJSCodeStyleSettings &settings)
 {
+    if (!m_preferences)
+        return;
+
+    QmlJSCodeStylePreferences *current = dynamic_cast<QmlJSCodeStylePreferences*>(m_preferences->currentPreferences());
+    if (!current)
+        return;
+
+    current->setCodeStyleSettings(settings);
+
     updatePreview();
 }
 
 void QmlJSCodeStylePreferencesWidget::updatePreview()
+{
+    switch (m_formatterSelectionWidget->selection().value()) {
+    case QmlCodeStyleWidgetBase::Builtin:
+        builtInFormatterPreview();
+        break;
+    case QmlCodeStyleWidgetBase::QmlFormat:
+        qmlformatPreview();
+        break;
+    case QmlCodeStyleWidgetBase::Custom:
+        customFormatterPreview();
+        break;
+    }
+}
+
+void QmlJSCodeStylePreferencesWidget::builtInFormatterPreview()
 {
     QTextDocument *doc = m_previewTextEdit->document();
 
@@ -121,6 +199,63 @@ void QmlJSCodeStylePreferencesWidget::updatePreview()
     tc.endEditBlock();
 }
 
+void QmlJSCodeStylePreferencesWidget::qmlformatPreview()
+{
+    using namespace Core;
+    const Utils::FilePath &qmlFormatPath = QmlFormatSettings::instance().latestQmlFormatPath();
+    if (qmlFormatPath.isEmpty()) {
+        MessageManager::writeSilently("QmlFormat not found.");
+        return;
+    }
+    const Utils::CommandLine commandLine(qmlFormatPath);
+    TextEditor::Command command;
+    command.setExecutable(commandLine.executable());
+    command.setProcessing(TextEditor::Command::FileProcessing);
+    command.addOptions(commandLine.splitArguments());
+    command.addOption("--inplace");
+    command.addOption("%file");
+    if (!command.isValid())
+        return;
+    TextEditor::TabSettings tabSettings;
+    QSettings settings(
+        QmlJSTools::QmlFormatSettings::globalQmlFormatIniFile().toUrlishString(),
+        QSettings::IniFormat);
+    if (settings.contains("IndentWidth"))
+        tabSettings.m_indentSize = settings.value("IndentWidth").toInt();
+    if (settings.contains("UseTabs"))
+        tabSettings.m_tabPolicy = settings.value("UseTabs").toBool()
+                                        ? TextEditor::TabSettings::TabPolicy::TabsOnlyTabPolicy
+                                        : TextEditor::TabSettings::TabPolicy::SpacesOnlyTabPolicy;
+    QString dummyFilePath = QStandardPaths::writableLocation(QStandardPaths::TempLocation) + "/dummy.qml";
+    m_previewTextEdit->textDocument()->setFilePath(Utils::FilePath::fromString(dummyFilePath));
+    m_previewTextEdit->textDocument()->setTabSettings(tabSettings);
+    TextEditor::formatEditor(m_previewTextEdit, command);
+}
+
+void QmlJSCodeStylePreferencesWidget::customFormatterPreview()
+{
+    Utils::FilePath path = m_preferences->currentCodeStyleSettings().customFormatterPath;
+    QStringList args = m_preferences->currentCodeStyleSettings()
+                           .customFormatterArguments.split(" ", Qt::SkipEmptyParts);
+    if (path.isEmpty()) {
+        Core::MessageManager::writeSilently("Custom formatter not found.");
+        return;
+    }
+    const Utils::CommandLine commandLine(path, args);
+    TextEditor::Command command;
+    command.setExecutable(commandLine.executable());
+    command.setProcessing(TextEditor::Command::FileProcessing);
+    command.addOptions(commandLine.splitArguments());
+    command.addOption("--inplace");
+    command.addOption("%file");
+    if (!command.isValid())
+        return;
+
+    QString dummyFilePath = QStandardPaths::writableLocation(QStandardPaths::TempLocation) + "/dummy.qml";
+    m_previewTextEdit->textDocument()->setFilePath(Utils::FilePath::fromString(dummyFilePath));
+    TextEditor::formatEditor(m_previewTextEdit, command);
+}
+
 // QmlJSCodeStyleSettingsPageWidget
 
 class QmlJSCodeStyleSettingsPageWidget : public Core::IOptionsPageWidget

src/plugins/qmljstools/qmljscodestylesettingspage.h

@@ -4,10 +4,13 @@
 #pragma once
 
 #include "qmljscodestylesettings.h"
+#include "qmljsformatterselectionwidget.h"
 
 #include <coreplugin/dialogs/ioptionspage.h>
 #include <texteditor/codestyleeditor.h>
 
+#include <QStackedWidget>
+
 QT_BEGIN_NAMESPACE
 class QString;
 class QWidget;
@@ -15,14 +18,10 @@ QT_END_NAMESPACE
 
 namespace TextEditor {
     class FontSettings;
-    class SimpleCodeStylePreferencesWidget;
-    class SnippetEditorWidget;
 }
 
 namespace QmlJSTools {
-class QmlJSCodeStylePreferencesWidget;
 class QmlJSCodeStyleSettings;
-
 namespace Internal {
 
 class QmlJSCodeStylePreferencesWidget : public TextEditor::CodeStyleEditorWidget
@@ -37,16 +36,19 @@ public:
 private:
     void decorateEditor(const TextEditor::FontSettings &fontSettings);
     void setVisualizeWhitespace(bool on);
-    void slotSettingsChanged();
+    void slotSettingsChanged(const QmlJSCodeStyleSettings &);
+    void slotCurrentPreferencesChanged(TextEditor::ICodeStylePreferences *preferences);
     void updatePreview();
+    void builtInFormatterPreview();
+    void qmlformatPreview();
+    void customFormatterPreview();
 
-    QmlJSCodeStylePreferences *m_preferences = nullptr;
-    TextEditor::SimpleCodeStylePreferencesWidget *m_tabPreferencesWidget;
-    QmlJSTools::QmlJSCodeStylePreferencesWidget *m_codeStylePreferencesWidget;
+    FormatterSelectionWidget *m_formatterSelectionWidget;
+    QStackedWidget *m_formatterSettingsStack;
     TextEditor::SnippetEditorWidget *m_previewTextEdit;
+    QmlJSCodeStylePreferences *m_preferences = nullptr;
 };
 
-
 class QmlJSCodeStyleSettingsPage : public Core::IOptionsPage
 {
 public:

src/plugins/qmljstools/qmljscodestylesettingswidget.cpp

@@ -1,59 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
-
-#include "qmljscodestylesettingswidget.h"
-#include "qmljscodestylesettings.h"
-#include "qmljstoolstr.h"
-
-#include <utils/layoutbuilder.h>
-
-#include <QSpinBox>
-#include <QTextStream>
-
-namespace QmlJSTools {
-
-QmlJSCodeStyleSettingsWidget::QmlJSCodeStyleSettingsWidget(QWidget *parent)
-    : QWidget(parent)
-{
-    m_lineLengthSpinBox = new QSpinBox;
-    m_lineLengthSpinBox->setMinimum(0);
-    m_lineLengthSpinBox->setMaximum(999);
-
-    using namespace Layouting;
-    // clang-format off
-    Column {
-        Group {
-            title(Tr::tr("Other")),
-            Form {
-                Tr::tr("&Line length:"), m_lineLengthSpinBox, br,
-            }
-        },
-        noMargin
-    }.attachTo(this);
-    // clang-format on
-
-    connect(m_lineLengthSpinBox, &QSpinBox::valueChanged,
-            this, &QmlJSCodeStyleSettingsWidget::slotSettingsChanged);
-}
-
-void QmlJSCodeStyleSettingsWidget::setCodeStyleSettings(const QmlJSCodeStyleSettings &settings)
-{
-    QSignalBlocker blocker(this);
-    m_lineLengthSpinBox->setValue(settings.lineLength);
-}
-
-QmlJSCodeStyleSettings QmlJSCodeStyleSettingsWidget::codeStyleSettings() const
-{
-    QmlJSCodeStyleSettings set;
-
-    set.lineLength = m_lineLengthSpinBox->value();
-
-    return set;
-}
-
-void QmlJSCodeStyleSettingsWidget::slotSettingsChanged()
-{
-    emit settingsChanged(codeStyleSettings());
-}
-
-} // namespace TextEditor

src/plugins/qmljstools/qmljscodestylesettingswidget.h

@@ -1,44 +0,0 @@
-// Copyright (C) 2016 The Qt Company Ltd.
-// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
-
-#pragma once
-
-#include "qmljstools_global.h"
-
-#include <QGroupBox>
-
-QT_BEGIN_NAMESPACE
-class QSpinBox;
-QT_END_NAMESPACE
-
-namespace QmlJSTools {
-class QmlJSCodeStyleSettings;
-
-class QMLJSTOOLS_EXPORT QmlJSCodeStyleSettingsWidget : public QWidget
-{
-    Q_OBJECT
-
-public:
-    enum CodingStyleLink {
-        CppLink,
-        QtQuickLink
-    };
-
-    explicit QmlJSCodeStyleSettingsWidget(QWidget *parent = nullptr);
-
-    QmlJSCodeStyleSettings codeStyleSettings() const;
-
-    void setCodingStyleWarningVisible(bool visible);
-    void setCodeStyleSettings(const QmlJSCodeStyleSettings &settings);
-
-signals:
-    void settingsChanged(const QmlJSCodeStyleSettings &);
-
-private:
-    void slotSettingsChanged();
-    void codingStyleLinkActivated(const QString &linkString);
-
-    QSpinBox *m_lineLengthSpinBox;
-};
-
-} // namespace QmlJSTools

src/plugins/qmljstools/qmljscustomformatterwidget.cpp

@@ -0,0 +1,117 @@
+// Copyright (C) 2025 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "qmljscustomformatterwidget.h"
+#include "qmlformatsettings.h"
+#include "qmljsformatterselectionwidget.h"
+#include "qmljstoolstr.h"
+
+#include <utils/layoutbuilder.h>
+
+#include <QWidget>
+
+namespace QmlJSTools {
+
+CustomFormatterWidget::CustomFormatterWidget(QWidget *parent, FormatterSelectionWidget *selection)
+    : QmlCodeStyleWidgetBase(parent)
+    , m_formatterSelectionWidget(selection)
+{
+
+    m_customFormatterPath.setParent(this);
+    m_customFormatterArguments.setParent(this);
+
+    m_customFormatterPath.setPlaceHolderText(
+        QmlFormatSettings::instance().latestQmlFormatPath().toUrlishString());
+    m_customFormatterPath.setLabelText(Tr::tr("Command:"));
+
+    m_customFormatterArguments.setLabelText(Tr::tr("Arguments:"));
+    m_customFormatterArguments.setDisplayStyle(Utils::StringAspect::LineEditDisplay);
+
+    using namespace Layouting;
+    // clang-format off
+    Column {
+        Group {
+            title(Tr::tr("Custom Formatter Configuration")),
+            Column {
+                m_customFormatterPath, br,
+                m_customFormatterArguments, br,
+                st
+            },
+        },
+        noMargin,
+    }.attachTo(this);
+
+    // clang-format on
+    connect(
+        &m_customFormatterPath,
+        &Utils::BaseAspect::changed,
+        this,
+        &CustomFormatterWidget::slotSettingsChanged);
+    connect(
+        &m_customFormatterArguments,
+        &Utils::BaseAspect::changed,
+        this,
+        &CustomFormatterWidget::slotSettingsChanged);
+}
+
+void CustomFormatterWidget::setCodeStyleSettings(const QmlJSCodeStyleSettings& s)
+{
+    QSignalBlocker blocker(this);
+    if (s.customFormatterPath != m_customFormatterPath.expandedValue()) {
+        m_customFormatterPath.setValue(s.customFormatterPath);
+    }
+    if (s.customFormatterArguments != m_customFormatterArguments.value()) {
+        m_customFormatterArguments.setValue(s.customFormatterArguments);
+    }
+}
+
+void CustomFormatterWidget::setPreferences(QmlJSCodeStylePreferences *preferences)
+{
+    if (m_preferences == preferences)
+        return; // nothing changes
+
+    slotCurrentPreferencesChanged(preferences);
+
+    // cleanup old
+    if (m_preferences) {
+        disconnect(m_preferences, &QmlJSCodeStylePreferences::currentValueChanged, this, nullptr);
+        disconnect(m_preferences, &QmlJSCodeStylePreferences::currentPreferencesChanged,
+                   this, &CustomFormatterWidget::slotCurrentPreferencesChanged);
+    }
+    m_preferences = preferences;
+    // fillup new
+    if (m_preferences) {
+        setCodeStyleSettings(m_preferences->currentCodeStyleSettings());
+        connect(m_preferences, &QmlJSCodeStylePreferences::currentValueChanged, this, [this] {
+                this->setCodeStyleSettings(m_preferences->currentCodeStyleSettings());
+        });
+        connect(m_preferences, &QmlJSCodeStylePreferences::currentPreferencesChanged,
+                this, &CustomFormatterWidget::slotCurrentPreferencesChanged);
+    }
+}
+
+void CustomFormatterWidget::slotCurrentPreferencesChanged(
+    TextEditor::ICodeStylePreferences *preferences)
+{
+    QmlJSCodeStylePreferences *current = dynamic_cast<QmlJSCodeStylePreferences *>(
+        preferences ? preferences->currentPreferences() : nullptr);
+    const bool enableWidgets = current && !current->isReadOnly() && m_formatterSelectionWidget
+                               && m_formatterSelectionWidget->selection().value()
+                                      == QmlCodeStyleWidgetBase::Custom;
+    setEnabled(enableWidgets);
+}
+
+void CustomFormatterWidget::slotSettingsChanged()
+{
+    QmlJSCodeStyleSettings settings = m_preferences ? m_preferences->currentCodeStyleSettings()
+    : QmlJSCodeStyleSettings::currentGlobalCodeStyle();
+    if (m_customFormatterPath.value().isEmpty()) {
+        m_customFormatterPath.setValue(
+            QmlFormatSettings::instance().latestQmlFormatPath().toUrlishString());
+    }
+    settings.customFormatterPath = m_customFormatterPath.expandedValue();
+    settings.customFormatterArguments = m_customFormatterArguments.value();
+    emit settingsChanged(settings);
+}
+
+} // namespace QmlJSTools

src/plugins/qmljstools/qmljscustomformatterwidget.h

@@ -0,0 +1,27 @@
+// Copyright (C) 2025 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include "qmljscodestylesettings.h"
+#include "qmljsformatterselectionwidget.h"
+
+#include <utils/aspects.h>
+namespace QmlJSTools {
+class CustomFormatterWidget : public QmlCodeStyleWidgetBase
+{
+public:
+    explicit CustomFormatterWidget(QWidget *parent, FormatterSelectionWidget *selection = nullptr);
+    void setCodeStyleSettings(const QmlJSCodeStyleSettings &s) override;
+    void setPreferences(QmlJSCodeStylePreferences *preferences) override;
+    void slotCurrentPreferencesChanged(TextEditor::ICodeStylePreferences* preferences) override;
+
+private:
+    void slotSettingsChanged();
+    Utils::FilePathAspect m_customFormatterPath;
+    Utils::StringAspect m_customFormatterArguments;
+    FormatterSelectionWidget *m_formatterSelectionWidget = nullptr;
+    QmlJSCodeStylePreferences *m_preferences = nullptr;
+};
+
+} // namespace QmlJSTools

src/plugins/qmljstools/qmljsformatterselectionwidget.cpp

@@ -0,0 +1,89 @@
+// Copyright (C) 2025 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#include "qmljsformatterselectionwidget.h"
+#include "qmljstoolstr.h"
+#include <utils/layoutbuilder.h>
+
+namespace QmlJSTools {
+
+QmlCodeStyleWidgetBase::QmlCodeStyleWidgetBase(QWidget *parent)
+    : QWidget(parent)
+{
+}
+
+FormatterSelectionWidget::FormatterSelectionWidget(QWidget *parent)
+    : QmlCodeStyleWidgetBase(parent)
+{
+    using namespace Utils;
+    m_formatterSelection.setDefaultValue(Builtin);
+    m_formatterSelection.setDisplayStyle(SelectionAspect::DisplayStyle::RadioButtons);
+    m_formatterSelection.addOption(Tr::tr("Built-In Formatter [Deprecated]") );
+    m_formatterSelection.addOption(Tr::tr("QmlFormat [LSP]"));
+    m_formatterSelection.addOption(Tr::tr("Custom Formatter [Must be qmlformat compatible]"));
+    m_formatterSelection.setLabelText(Tr::tr("Formatter"));
+
+    connect(&m_formatterSelection, &SelectionAspect::changed,
+            this, &FormatterSelectionWidget::slotSettingsChanged);
+
+    using namespace Layouting;
+    Column {
+        Group {
+            title(Tr::tr("Formatter Selection")),
+            Column {
+                m_formatterSelection, br
+            }
+        }
+    }.attachTo(this);
+}
+
+void FormatterSelectionWidget::setCodeStyleSettings(const QmlJSCodeStyleSettings &s)
+{
+    if (s.formatter != m_formatterSelection.value())
+        m_formatterSelection.setValue(s.formatter);
+}
+
+void FormatterSelectionWidget::setPreferences(QmlJSCodeStylePreferences *preferences)
+{
+    if (m_preferences == preferences)
+        return; // nothing changes
+
+    slotCurrentPreferencesChanged(preferences);
+
+    // cleanup old
+    if (m_preferences) {
+        disconnect(m_preferences, &QmlJSCodeStylePreferences::currentValueChanged, this, nullptr);
+        disconnect(m_preferences, &QmlJSCodeStylePreferences::currentPreferencesChanged,
+                this, &FormatterSelectionWidget::slotCurrentPreferencesChanged);
+    }
+    m_preferences = preferences;
+    // fillup new
+    if (m_preferences) {
+        setCodeStyleSettings(m_preferences->currentCodeStyleSettings());
+        connect(m_preferences, &QmlJSCodeStylePreferences::currentValueChanged, this, [this] {
+            setCodeStyleSettings(m_preferences->currentCodeStyleSettings());
+        });
+        connect(m_preferences, &QmlJSCodeStylePreferences::currentPreferencesChanged,
+                this, &FormatterSelectionWidget::slotCurrentPreferencesChanged);
+    }
+}
+
+void FormatterSelectionWidget::slotCurrentPreferencesChanged(
+    TextEditor::ICodeStylePreferences *preferences)
+{
+    QmlJSCodeStylePreferences *current = dynamic_cast<QmlJSCodeStylePreferences *>(
+        preferences ? preferences->currentPreferences() : nullptr);
+    const bool enableWidgets = current && !current->isReadOnly();
+    setEnabled(enableWidgets);
+}
+
+void FormatterSelectionWidget::slotSettingsChanged()
+{
+    QmlJSCodeStyleSettings settings = m_preferences
+                                          ? m_preferences->currentCodeStyleSettings()
+                                          : QmlJSCodeStyleSettings::currentGlobalCodeStyle();
+    settings.formatter = static_cast<QmlJSCodeStyleSettings::Formatter>(m_formatterSelection.value());
+    emit settingsChanged(settings);
+}
+
+} // namespace QmlJSTools

src/plugins/qmljstools/qmljsformatterselectionwidget.h

@@ -0,0 +1,51 @@
+// Copyright (C) 2025 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
+
+#pragma once
+
+#include "qmljscodestylesettings.h"
+
+#include <utils/aspects.h>
+
+namespace QmlJSTools {
+class QmlJSCodeStyleSettings;
+
+class QmlCodeStyleWidgetBase : public QWidget
+{
+    Q_OBJECT
+public:
+    QmlCodeStyleWidgetBase(QWidget *parent = nullptr);
+    virtual ~QmlCodeStyleWidgetBase() = default;
+    enum Formatter {
+        Builtin,
+        QmlFormat,
+        Custom,
+        Count
+    };
+    virtual void setCodeStyleSettings(const QmlJSCodeStyleSettings &s) = 0;
+    virtual void setPreferences(QmlJSCodeStylePreferences *preferences) = 0;
+    virtual void slotCurrentPreferencesChanged(TextEditor::ICodeStylePreferences *preferences) = 0;
+
+signals:
+    void settingsChanged(const QmlJSCodeStyleSettings &);
+};
+class FormatterSelectionWidget : public QmlCodeStyleWidgetBase
+{
+    Q_OBJECT
+public:
+    explicit FormatterSelectionWidget(QWidget *parent);
+
+    const Utils::SelectionAspect &selection() const { return m_formatterSelection; }
+    Utils::SelectionAspect &selection() { return m_formatterSelection; }
+
+    void setCodeStyleSettings(const QmlJSCodeStyleSettings &s) override;
+    void setPreferences(QmlJSCodeStylePreferences *preferences) override;
+    void slotCurrentPreferencesChanged(TextEditor::ICodeStylePreferences *preferences) override;
+
+private:
+    void slotSettingsChanged();
+    Utils::SelectionAspect m_formatterSelection;
+    QmlJSCodeStylePreferences *m_preferences = nullptr;
+};
+
+} // namespace QmlJSTools

src/plugins/qmljstools/qmljstools.qbs

@@ -25,8 +25,6 @@ QtcPlugin {
         "qmljscodestylesettings.h",
         "qmljscodestylesettingspage.cpp",
         "qmljscodestylesettingspage.h",
-        "qmljscodestylesettingswidget.cpp",
-        "qmljscodestylesettingswidget.h",
         "qmljsfunctionfilter.cpp",
         "qmljsfunctionfilter.h",
         "qmljsindenter.cpp",

src/plugins/qmljstools/qmljstoolssettings.cpp

@@ -8,6 +8,7 @@
 #include "qmljsindenter.h"
 #include "qmljstoolsconstants.h"
 #include "qmljstoolssettings.h"
+#include "qmlformatsettings.h"
 #include "qmljstoolstr.h"
 
 #include <projectexplorer/project.h>
@@ -20,6 +21,7 @@
 #include <texteditor/texteditorsettings.h>
 
 #include <utils/id.h>
+#include <utils/filepath.h>
 #include <utils/mimeconstants.h>
 #include <utils/mimeutils.h>
 #include <utils/qtcassert.h>
@@ -166,9 +168,22 @@ QmlJSToolsSettings::QmlJSToolsSettings()
     qtTabSettings.m_indentSize = 4;
     qtTabSettings.m_continuationAlignBehavior = TabSettings::ContinuationAlignWithIndent;
     qtCodeStyle->setTabSettings(qtTabSettings);
-    QmlJSCodeStyleSettings qtQmlJSSetings;
-    qtQmlJSSetings.lineLength = 80;
-    qtCodeStyle->setCodeStyleSettings(qtQmlJSSetings);
+
+    connect(&QmlFormatSettings::instance(), &QmlFormatSettings::qmlformatIniCreated, [](Utils::FilePath qmlformatIniPath) {
+        QmlJSCodeStyleSettings s;
+        s.lineLength = 80;
+        Utils::expected_str<QByteArray> fileContents = qmlformatIniPath.fileContents();
+        if (fileContents)
+            s.qmlformatIniContent = QString::fromUtf8(*qmlformatIniPath.fileContents());
+        auto builtInCodeStyles = TextEditorSettings::codeStylePool(
+                                     QmlJSTools::Constants::QML_JS_SETTINGS_ID)
+                                     ->builtInCodeStyles();
+        for (auto codeStyle : builtInCodeStyles) {
+            if (auto qtCodeStyle = dynamic_cast<QmlJSCodeStylePreferences *>(codeStyle))
+                qtCodeStyle->setCodeStyleSettings(s);
+        }
+    });
+
     pool->addCodeStyle(qtCodeStyle);
 
     // default delegate for global preferences

src/plugins/texteditor/texteditorconstants.h

@@ -138,6 +138,7 @@ const char UNFOLD_RECURSIVELY[]    = "TextEditor.UnfoldRecursively";
 const char UNFOLD_ALL[]            = "TextEditor.UnFoldAll";
 const char AUTO_INDENT_SELECTION[] = "TextEditor.AutoIndentSelection";
 const char AUTO_FORMAT_SELECTION[] = "TextEditor.AutoFormatSelection";
+const char REFORMAT_FILE[]         = "TextEditor.ReformatFile";
 const char INCREASE_FONT_SIZE[]    = "TextEditor.IncreaseFontSize";
 const char DECREASE_FONT_SIZE[]    = "TextEditor.DecreaseFontSize";
 const char RESET_FONT_SIZE[]       = "TextEditor.ResetFontSize";