Clang: Make clazy UI more fine-grained

...so that specific checks can be enabled/disabled.

This replaces the level radio buttons in Tools > Options > C++ > Code
Model > "Manage..." > Tab: Clazy.

Task-number: QTCREATORBUG-21120
Change-Id: If468d79d3c309b287b4105d83ac31f0b1489c71c
Reviewed-by: Ivan Donchevskii <ivan.donchevskii@qt.io>

12 files changed, 877 insertions, 173 deletions

diff --git a/scripts/generateClazyChecks.py b/scripts/generateClazyChecks.py
new file mode 100755
index 0000000000..373512de75
--- /dev/null
+++ b/scripts/generateClazyChecks.py
@@ -0,0 +1,131 @@
+#!/usr/bin/env python
+############################################################################
+#
+# Copyright (C) 2019 The Qt Company Ltd.
+# Contact: https://www.qt.io/licensing/
+#
+# This file is part of Qt Creator.
+#
+# Commercial License Usage
+# Licensees holding valid commercial Qt licenses may use this file in
+# accordance with the commercial license agreement provided with the
+# Software or, alternatively, in accordance with the terms contained in
+# a written agreement between you and The Qt Company. For licensing terms
+# and conditions see https://www.qt.io/terms-conditions. For further
+# information use the contact form at https://www.qt.io/contact-us.
+#
+# GNU General Public License Usage
+# Alternatively, this file may be used under the terms of the GNU
+# General Public License version 3 as published by the Free Software
+# Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+# included in the packaging of this file. Please review the following
+# information to ensure the GNU General Public License requirements will
+# be met: https://www.gnu.org/licenses/gpl-3.0.html.
+#
+############################################################################
+
+import argparse
+import json
+import os
+
+def full_header_file_content(checks_initializer_as_string):
+    return '''/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include <vector>
+
+namespace CppTools {
+namespace Constants {
+
+class ClazyCheckInfo
+{
+public:
+    bool isValid() const { return !name.isEmpty() && level >= -1; }
+
+    QString name;
+    int level = -1; // "Manual level"
+    QStringList topics;
+};
+using ClazyCheckInfos = std::vector<ClazyCheckInfo>;
+
+// CLANG-UPGRADE-CHECK: Run 'scripts/generateClazyChecks.py' after Clang upgrade to
+// update this header.
+static const ClazyCheckInfos CLAZY_CHECKS = {
+''' + checks_initializer_as_string + '''
+};
+
+} // namespace Constants
+} // namespace CppTools
+'''
+
+def parse_arguments():
+    parser = argparse.ArgumentParser(description='Clazy checks header file generator')
+    parser.add_argument('--clazy-checks-json-path', help='path to clazy\'s checks.json',
+        default=None, dest='checks_json_path')
+    return parser.parse_args()
+
+def quoted(text):
+   return '"%s"' % (text)
+
+def categories_as_initializer_string(check):
+    if 'categories' not in check:
+        return '{}'
+    out = ''
+    for category in check['categories']:
+        out += quoted(category) + ','
+    if out.endswith(','):
+        out = out[:-1]
+    return '{' + out + '}'
+
+def check_as_initializer_string(check):
+    return '{%s, %d, %s}' %(quoted(check['name']),
+                            check['level'],
+                            categories_as_initializer_string(check))
+
+def checks_as_initializer_string(checks):
+    out = ''
+    for check in checks:
+        out += '    ' + check_as_initializer_string(check) + ',\n'
+    if out.endswith(',\n'):
+        out = out[:-2]
+    return out
+
+def main():
+    arguments = parse_arguments()
+
+    content = file(arguments.checks_json_path).read()
+    checks = json.loads(content)['checks']
+
+    current_path = os.path.dirname(os.path.abspath(__file__))
+    header_path = os.path.abspath(os.path.join(current_path, '..', 'src',
+        'plugins', 'cpptools', 'cpptools_clazychecks.h'))
+
+    with open(header_path, 'w') as f:
+        f.write(full_header_file_content(checks_as_initializer_string(checks)))
+
+if __name__ == "__main__":
+    main()
diff --git a/src/plugins/cpptools/clangdiagnosticconfigsselectionwidget.cpp b/src/plugins/cpptools/clangdiagnosticconfigsselectionwidget.cpp
index 06d8478b50..eb89d7d87e 100644
--- a/src/plugins/cpptools/clangdiagnosticconfigsselectionwidget.cpp
+++ b/src/plugins/cpptools/clangdiagnosticconfigsselectionwidget.cpp
@@ -120,12 +120,14 @@ void ClangDiagnosticConfigsSelectionWidget::connectToClangDiagnosticConfigsDialo
         connect(buttonsBox, &QDialogButtonBox::accepted, &dialog, &QDialog::accept);
         connect(buttonsBox, &QDialogButtonBox::rejected, &dialog, &QDialog::reject);
 
-        connect(&dialog, &QDialog::accepted, [widget]() {
+        const bool previousEnableLowerClazyLevels = codeModelSettings()->enableLowerClazyLevels();
+        connect(&dialog, &QDialog::accepted, [widget, previousEnableLowerClazyLevels]() {
             QSharedPointer<CppCodeModelSettings> settings = codeModelSettings();
             const ClangDiagnosticConfigs oldDiagnosticConfigs
                     = settings->clangCustomDiagnosticConfigs();
             const ClangDiagnosticConfigs currentDiagnosticConfigs = widget->customConfigs();
-            if (oldDiagnosticConfigs != currentDiagnosticConfigs) {
+            if (oldDiagnosticConfigs != currentDiagnosticConfigs
+                 || previousEnableLowerClazyLevels != codeModelSettings()->enableLowerClazyLevels()) {
                 const ClangDiagnosticConfigsModel configsModel(currentDiagnosticConfigs);
                 if (!configsModel.hasConfigWithId(settings->clangDiagnosticConfigId()))
                     settings->resetClangDiagnosticConfigId();
diff --git a/src/plugins/cpptools/clangdiagnosticconfigswidget.cpp b/src/plugins/cpptools/clangdiagnosticconfigswidget.cpp
index fb683a07ae..fc157352ee 100644
--- a/src/plugins/cpptools/clangdiagnosticconfigswidget.cpp
+++ b/src/plugins/cpptools/clangdiagnosticconfigswidget.cpp
@@ -27,6 +27,7 @@
 
 #include "cppcodemodelsettings.h"
 #include "cpptools_clangtidychecks.h"
+#include "cpptools_clazychecks.h"
 #include "cpptoolsconstants.h"
 #include "cpptoolsreuse.h"
 #include "ui_clangdiagnosticconfigswidget.h"
@@ -45,10 +46,14 @@
 #include <QDialogButtonBox>
 #include <QInputDialog>
 #include <QPushButton>
+#include <QSortFilterProxyModel>
+#include <QStringListModel>
 #include <QUuid>
 
 namespace CppTools {
 
+using namespace Constants;
+
 static constexpr const char CLANG_STATIC_ANALYZER_URL[]
     = "https://clang-analyzer.llvm.org/available_checks.html";
 
@@ -75,13 +80,99 @@ static bool needsLink(ProjectExplorer::Tree *node) {
     return !node->isDir && !node->fullPath.toString().startsWith("clang-analyzer-");
 }
 
-class TidyChecksTreeModel final : public ProjectExplorer::SelectableFilesModel
+static void selectAll(QAbstractItemView *view)
+{
+    view->setSelectionMode(QAbstractItemView::MultiSelection);
+    view->selectAll();
+    view->setSelectionMode(QAbstractItemView::SingleSelection);
+}
+
+class BaseChecksTreeModel : public ProjectExplorer::SelectableFilesModel
 {
     Q_OBJECT
 
 public:
-    TidyChecksTreeModel()
+    enum Roles { LinkRole = Qt::UserRole + 1 };
+    enum Columns { NameColumn, LinkColumn };
+
+    BaseChecksTreeModel()
         : ProjectExplorer::SelectableFilesModel(nullptr)
+    {}
+
+    int columnCount(const QModelIndex &) const override { return 2; }
+
+    QVariant data(const QModelIndex &fullIndex, int role = Qt::DisplayRole) const override
+    {
+        if (fullIndex.column() == LinkColumn) {
+            switch (role) {
+            case Qt::DisplayRole:
+                return tr("Web Page");
+            case Qt::FontRole: {
+                QFont font = QApplication::font();
+                font.setUnderline(true);
+                return font;
+            }
+            case Qt::ForegroundRole:
+                return QApplication::palette().link().color();
+            }
+            return QVariant();
+        }
+        return QVariant();
+    }
+
+    bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override
+    {
+        if (role == Qt::CheckStateRole && !m_enabled)
+            return false;
+        ProjectExplorer::SelectableFilesModel::setData(index, value, role);
+        return true;
+    }
+
+    void setEnabled(bool enabled)
+    {
+        m_enabled = enabled;
+    }
+
+    // TODO: Remove/replace this method after base class refactoring is done.
+    void traverse(const QModelIndex &index,
+                  const std::function<bool(const QModelIndex &)> &visit) const
+    {
+        if (!index.isValid())
+            return;
+
+        if (!visit(index))
+            return;
+
+        if (!hasChildren(index))
+            return;
+
+        const int rows = rowCount(index);
+        const int cols = columnCount(index);
+        for (int i = 0; i < rows; ++i) {
+            for (int j = 0; j < cols; ++j)
+                traverse(this->index(i, j, index), visit);
+        }
+    }
+
+protected:
+    bool m_enabled = true;
+};
+
+static void openUrl(QAbstractItemModel *model, const QModelIndex &index)
+{
+    const QString link = model->data(index, BaseChecksTreeModel::LinkRole).toString();
+    if (link.isEmpty())
+        return;
+
+    QDesktopServices::openUrl(QUrl(link));
+};
+
+class TidyChecksTreeModel final : public BaseChecksTreeModel
+{
+    Q_OBJECT
+
+public:
+    TidyChecksTreeModel()
     {
         buildTree(nullptr, m_root, Constants::CLANG_TIDY_CHECKS_ROOT);
     }
@@ -119,11 +210,7 @@ public:
         }
     }
 
-    int columnCount(const QModelIndex &/*parent*/) const override
-    {
-        return 2;
-    }
-
+private:
     QVariant data(const QModelIndex &fullIndex, int role = Qt::DisplayRole) const final
     {
         if (!fullIndex.isValid() || role == Qt::DecorationRole)
@@ -134,25 +221,16 @@ public:
         if (fullIndex.column() == 1) {
             if (!needsLink(node))
                 return QVariant();
-            switch (role) {
-            case Qt::DisplayRole:
-                return tr("Web Page");
-            case Qt::FontRole: {
-                QFont font = QApplication::font();
-                font.setUnderline(true);
-                return font;
-            }
-            case Qt::ForegroundRole:
-                return QApplication::palette().link().color();
-            case Qt::UserRole: {
+
+            if (role == LinkRole) {
                 // 'clang-analyzer-' group
                 if (node->isDir)
                     return QString::fromUtf8(CLANG_STATIC_ANALYZER_URL);
                 return QString::fromUtf8(Constants::TIDY_DOCUMENTATION_URL_TEMPLATE)
                         .arg(node->fullPath.toString());
             }
-            }
-            return QVariant();
+
+            return BaseChecksTreeModel::data(fullIndex, role);
         }
 
         if (role == Qt::DisplayRole)
@@ -161,39 +239,218 @@ public:
         return ProjectExplorer::SelectableFilesModel::data(index, role);
     }
 
-    void setEnabled(bool enabled)
+    QModelIndex indexForCheck(const QString &check) const {
+        if (check == "*")
+            return index(0, 0, QModelIndex());
+
+        QModelIndex result;
+        traverse(index(0, 0, QModelIndex()), [&](const QModelIndex &index){
+            using ProjectExplorer::Tree;
+            if (result.isValid())
+                return false;
+
+            auto *node = static_cast<Tree *>(index.internalPointer());
+            const QString nodeName = node->fullPath.toString();
+            if ((check.endsWith("*") && nodeName.startsWith(check.left(check.length() - 1)))
+                    || (!node->isDir && nodeName == check)) {
+                result = index;
+                return false;
+            }
+
+            return check.startsWith(nodeName);
+        });
+        return result;
+    }
+
+    static void collectChecks(const ProjectExplorer::Tree *root, QString &checks)
     {
-        m_enabled = enabled;
+        if (root->checked == Qt::Unchecked)
+            return;
+        if (root->checked == Qt::Checked) {
+            checks += "," + root->fullPath.toString();
+            if (root->isDir)
+                checks += "*";
+            return;
+        }
+        for (const ProjectExplorer::Tree *t : root->childDirectories)
+            collectChecks(t, checks);
     }
+};
 
-    bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override
+class ClazyChecksTree : public ProjectExplorer::Tree
+{
+public:
+    enum Kind { TopLevelNode, LevelNode, CheckNode };
+    ClazyChecksTree(const QString &name, Kind kind)
     {
-        if (role == Qt::CheckStateRole && !m_enabled)
-            return false;
-        return ProjectExplorer::SelectableFilesModel::setData(index, value, role);
+        this->name = name;
+        this->kind = kind;
+        this->isDir = kind == TopLevelNode || kind == LevelNode;
     }
 
-private:
+    static ClazyChecksTree *fromIndex(const QModelIndex &index)
+    {
+        return static_cast<ClazyChecksTree *>(index.internalPointer());
+    }
 
-    // TODO: Remove/replace this method after base class refactoring is done.
-    void traverse(const QModelIndex &index,
-                  const std::function<bool(const QModelIndex &)> &visit) const
+public:
+    ClazyCheckInfo checkInfo;
+    Kind kind = TopLevelNode;
+};
+
+class ClazyChecksTreeModel final : public BaseChecksTreeModel
+{
+    Q_OBJECT
+
+public:
+    ClazyChecksTreeModel() { buildTree(); }
+
+    QStringList enabledChecks() const
     {
-        if (!index.isValid())
-            return;
+        QStringList checks;
+        collectChecks(m_root, checks);
+        return checks;
+    }
 
-        if (!visit(index))
-            return;
+    void enableChecks(const QStringList &checks)
+    {
+        // Unselect all
+        m_root->checked = Qt::Unchecked;
+        propagateDown(index(0, 0, QModelIndex()));
 
-        if (!hasChildren(index))
+        // <= Qt Creator 4.8 settings provide specific levels: {"level0"}
+        if (checks.size() == 1 && checks.first().startsWith("level")) {
+            bool ok = false;
+            const int level = checks.first().mid(5).toInt(&ok);
+            QTC_ASSERT(ok, return);
+            enableChecksByLevel(level);
             return;
+        }
 
-        const int rows = rowCount(index);
-        const int cols = columnCount(index);
-        for (int i = 0; i < rows; ++i) {
-            for (int j = 0; j < cols; ++j)
-                traverse(this->index(i, j, index), visit);
+        // >= Qt Creator 4.9 settings provide specific checks: {c1, c2, ...}
+        for (const QString &check : checks) {
+            const QModelIndex index = indexForCheck(check);
+            if (!index.isValid())
+                continue;
+            ClazyChecksTree::fromIndex(index)->checked = Qt::Checked;
+            propagateUp(index);
+            propagateDown(index);
+        }
+    }
+
+    bool hasEnabledButNotVisibleChecks(
+        const std::function<bool(const QModelIndex &index)> &isHidden) const
+    {
+        bool enabled = false;
+        traverse(index(0, 0, QModelIndex()), [&](const QModelIndex &index){
+            if (enabled)
+                return false;
+            const auto *node = ClazyChecksTree::fromIndex(index);
+            if (node->kind == ClazyChecksTree::CheckNode && index.column() == NameColumn) {
+                const bool isChecked = data(index, Qt::CheckStateRole).toInt() == Qt::Checked;
+                const bool isVisible = isHidden(index);
+                if (isChecked && isVisible) {
+                    enabled = true;
+                    return false;
+                }
+            }
+            return true;
+        });
+
+        return enabled;
+    }
+
+    bool enableLowerLevels() const { return m_enableLowerLevels; }
+    void setEnableLowerLevels(bool enable) { m_enableLowerLevels = enable; }
+
+    QSet<QString> topics() const { return m_topics; }
+
+private:
+    void buildTree()
+    {
+        // Top level node
+        m_root = new ClazyChecksTree("*", ClazyChecksTree::TopLevelNode);
+
+        for (const ClazyCheckInfo &check : CLAZY_CHECKS) {
+            // Level node
+            ClazyChecksTree *&levelNode = m_levelNodes[check.level];
+            if (!levelNode) {
+                levelNode = new ClazyChecksTree(levelDescription(check.level), ClazyChecksTree::LevelNode);
+                levelNode->parent = m_root;
+                levelNode->checkInfo.level = check.level; // Pass on the level for sorting
+                m_root->childDirectories << levelNode;
+            }
+
+            // Check node
+            auto checkNode = new ClazyChecksTree(check.name, ClazyChecksTree::CheckNode);
+            checkNode->parent = levelNode;
+            checkNode->checkInfo = check;
+
+            levelNode->childDirectories.append(checkNode);
+
+            m_topics.unite(check.topics.toSet());
+        }
+    }
+
+    QVariant data(const QModelIndex &fullIndex, int role = Qt::DisplayRole) const override final
+    {
+        if (!fullIndex.isValid() || role == Qt::DecorationRole)
+            return QVariant();
+        const QModelIndex index = this->index(fullIndex.row(), 0, fullIndex.parent());
+        const auto *node = ClazyChecksTree::fromIndex(index);
+
+        if (fullIndex.column() == LinkColumn) {
+            if (role == LinkRole) {
+                if (node->checkInfo.name.isEmpty())
+                    return QVariant();
+                return QString::fromUtf8(Constants::CLAZY_DOCUMENTATION_URL_TEMPLATE).arg(node->name);
+            }
+            if (role == Qt::DisplayRole && node->kind != ClazyChecksTree::CheckNode)
+                return QVariant();
+
+            return BaseChecksTreeModel::data(fullIndex, role);
         }
+
+        if (role == Qt::DisplayRole)
+            return node->name;
+
+        return ProjectExplorer::SelectableFilesModel::data(index, role);
+    }
+
+    static QString levelDescription(int level)
+    {
+        switch (level) {
+        case -1:
+            return tr("Manual Level: Very few false positives");
+        case 0:
+            return tr("Level 0: No false positives");
+        case 1:
+            return tr("Level 1: Very few false positives");
+        case 2:
+            return tr("Level 2: More false positives");
+        case 3:
+            return tr("Level 3: Experimental checks");
+        default:
+            QTC_CHECK(false && "No clazy level description");
+            return tr("Level %1").arg(QString::number(level));
+        }
+    }
+
+    void enableChecksByLevel(int level)
+    {
+        if (level < 0)
+            return;
+
+        ClazyChecksTree *node = m_levelNodes.value(level);
+        QTC_ASSERT(node, return);
+        const QModelIndex index = indexForTree(node);
+        QTC_ASSERT(index.isValid(), return);
+
+        node->checked = Qt::Checked;
+        propagateUp(index);
+        propagateDown(index);
+
+        enableChecksByLevel(--level);
     }
 
     QModelIndex indexForCheck(const QString &check) const {
@@ -202,38 +459,137 @@ private:
 
         QModelIndex result;
         traverse(index(0, 0, QModelIndex()), [&](const QModelIndex &index){
-            using ProjectExplorer::Tree;
             if (result.isValid())
                 return false;
-
-            auto *node = static_cast<Tree *>(index.internalPointer());
-            const QString nodeName = node->fullPath.toString();
-            if ((check.endsWith("*") && nodeName.startsWith(check.left(check.length() - 1)))
-                    || (!node->isDir && nodeName == check)) {
+            const auto *node = ClazyChecksTree::fromIndex(index);
+            if (node->kind == ClazyChecksTree::CheckNode && node->checkInfo.name == check) {
                 result = index;
                 return false;
             }
+            return true;
+        });
+        return result;
+    }
 
-            return check.startsWith(nodeName);
+    QModelIndex indexForTree(const ClazyChecksTree *tree) const {
+        if (!tree)
+            return QModelIndex();
+
+        QModelIndex result;
+        traverse(index(0, 0, QModelIndex()), [&](const QModelIndex &index){
+            if (result.isValid())
+                return false;
+            if (index.internalPointer() == tree) {
+                result = index;
+                return false;
+            }
+            return true;
         });
         return result;
     }
 
-    static void collectChecks(const ProjectExplorer::Tree *root, QString &checks)
+    static void collectChecks(const ProjectExplorer::Tree *root, QStringList &checks)
     {
         if (root->checked == Qt::Unchecked)
             return;
-        if (root->checked == Qt::Checked) {
-            checks += "," + root->fullPath.toString();
-            if (root->isDir)
-                checks += "*";
+        if (root->checked == Qt::Checked && !root->isDir) {
+            checks.append(root->name);
             return;
         }
         for (const ProjectExplorer::Tree *t : root->childDirectories)
             collectChecks(t, checks);
     }
 
-    bool m_enabled = true;
+    static QStringList toStringList(const QVariantList &variantList)
+    {
+        QStringList list;
+        for (auto &item : variantList)
+            list.append(item.toString());
+        return list;
+    }
+
+private:
+    QHash<int, ClazyChecksTree *> m_levelNodes;
+    QSet<QString> m_topics;
+    bool m_enableLowerLevels = true;
+};
+
+class ClazyChecksSortFilterModel : public QSortFilterProxyModel
+{
+public:
+    ClazyChecksSortFilterModel(QObject *parent)
+        : QSortFilterProxyModel(parent)
+    {}
+
+    void setTopics(const QStringList &value)
+    {
+        m_topics = value;
+        invalidateFilter();
+    }
+
+    bool filterAcceptsRow(int sourceRow, const QModelIndex &sourceParent) const override
+    {
+        const QModelIndex index = sourceModel()->index(sourceRow, 0, sourceParent);
+        if (!index.isValid())
+            return false;
+
+        const auto *node = ClazyChecksTree::fromIndex(index);
+        if (node->kind == ClazyChecksTree::CheckNode) {
+            const QStringList topics = node->checkInfo.topics;
+            return Utils::anyOf(m_topics, [this, topics](const QString &topic) {
+                return topics.contains(topic);
+            });
+        }
+
+        return true;
+    }
+
+private:
+    // Note that sort order of levels is important for "enableLowerLevels" mode, see setData().
+    bool lessThan(const QModelIndex &l, const QModelIndex &r) const override
+    {
+        const int leftLevel = adaptLevel(ClazyChecksTree::fromIndex(l)->checkInfo.level);
+        const int rightLevel = adaptLevel(ClazyChecksTree::fromIndex(r)->checkInfo.level);
+
+        if (leftLevel == rightLevel)
+            return sourceModel()->data(l).toString() < sourceModel()->data(r).toString();
+        return leftLevel < rightLevel;
+    }
+
+    static bool adaptLevel(int level)
+    {
+        if (level == -1) // "Manual Level"
+            return 1000;
+        return level;
+    }
+
+    bool setData(const QModelIndex &index, const QVariant &value, int role = Qt::EditRole) override
+    {
+        if (!index.isValid())
+            return false;
+
+        if (role == Qt::CheckStateRole
+              && static_cast<ClazyChecksTreeModel *>(sourceModel())->enableLowerLevels()
+              && QSortFilterProxyModel::setData(index, value, role)) {
+            const auto *node = ClazyChecksTree::fromIndex(mapToSource(index));
+            if (node->kind == ClazyChecksTree::LevelNode && node->checkInfo.level >= 0) {
+                // Rely on the sort order to find the lower level index/node
+                const auto previousIndex = this->index(index.row() - 1,
+                                                       index.column(),
+                                                       index.parent());
+                if (previousIndex.isValid()
+                    && ClazyChecksTree::fromIndex(mapToSource(previousIndex))->checkInfo.level
+                           >= 0) {
+                    setData(previousIndex, value, role);
+                }
+            }
+        }
+
+        return QSortFilterProxyModel::setData(index, value, role);
+    }
+
+private:
+    QStringList m_topics;
 };
 
 ClangDiagnosticConfigsWidget::ClangDiagnosticConfigsWidget(const Core::Id &configToSelect,
@@ -241,6 +597,7 @@ ClangDiagnosticConfigsWidget::ClangDiagnosticConfigsWidget(const Core::Id &confi
     : QWidget(parent)
     , m_ui(new Ui::ClangDiagnosticConfigsWidget)
     , m_diagnosticConfigsModel(codeModelSettings()->clangCustomDiagnosticConfigs())
+    , m_clazyTreeModel(new ClazyChecksTreeModel())
     , m_tidyTreeModel(new TidyChecksTreeModel())
 {
     m_ui->setupUi(this);
@@ -256,14 +613,12 @@ ClangDiagnosticConfigsWidget::ClangDiagnosticConfigsWidget(const Core::Id &confi
             this, &ClangDiagnosticConfigsWidget::onRemoveButtonClicked);
     connectDiagnosticOptionsChanged();
 
-    connect(m_tidyChecks->checksPrefixesTree, &QTreeView::clicked,
-            [this](const QModelIndex &index) {
-        const QString link = m_tidyTreeModel->data(index, Qt::UserRole).toString();
-        if (link.isEmpty())
-            return;
-
-        QDesktopServices::openUrl(QUrl(link));
-    });
+    connect(m_tidyChecks->checksPrefixesTree,
+            &QTreeView::clicked,
+            [model = m_tidyTreeModel.get()](const QModelIndex &index) { openUrl(model, index); });
+    connect(m_clazyChecks->checksView,
+            &QTreeView::clicked,
+            [model = m_clazySortFilterProxyModel](const QModelIndex &index) { openUrl(model, index); });
 
     syncWidgetsToModel(configToSelect);
 }
@@ -344,25 +699,12 @@ void ClangDiagnosticConfigsWidget::onClangTidyTreeChanged()
     updateConfig(config);
 }
 
-void ClangDiagnosticConfigsWidget::onClazyRadioButtonChanged(bool checked)
+void ClangDiagnosticConfigsWidget::onClazyTreeChanged()
 {
-    if (!checked)
-        return;
-
-    QString checks;
-    if (m_clazyChecks->clazyRadioDisabled->isChecked())
-        checks = QString();
-    else if (m_clazyChecks->clazyRadioLevel0->isChecked())
-        checks = "level0";
-    else if (m_clazyChecks->clazyRadioLevel1->isChecked())
-        checks = "level1";
-    else if (m_clazyChecks->clazyRadioLevel2->isChecked())
-        checks = "level2";
-    else if (m_clazyChecks->clazyRadioLevel3->isChecked())
-        checks = "level3";
+    syncClazyChecksGroupBox();
 
     ClangDiagnosticConfig config = selectedConfig();
-    config.setClazyChecks(checks);
+    config.setClazyChecks(m_clazyTreeModel->enabledChecks().join(","));
     updateConfig(config);
 }
 
@@ -518,22 +860,35 @@ void ClangDiagnosticConfigsWidget::syncTidyChecksToTree(const ClangDiagnosticCon
 
 void ClangDiagnosticConfigsWidget::syncClazyWidgets(const ClangDiagnosticConfig &config)
 {
+    disconnectClazyItemChanged();
+
     const QString clazyChecks = config.clazyChecks();
 
-    QRadioButton *button = m_clazyChecks->clazyRadioDisabled;
-    if (clazyChecks.isEmpty())
-        button = m_clazyChecks->clazyRadioDisabled;
-    else if (clazyChecks == "level0")
-        button = m_clazyChecks->clazyRadioLevel0;
-    else if (clazyChecks == "level1")
-        button = m_clazyChecks->clazyRadioLevel1;
-    else if (clazyChecks == "level2")
-        button = m_clazyChecks->clazyRadioLevel2;
-    else if (clazyChecks == "level3")
-        button = m_clazyChecks->clazyRadioLevel3;
+    m_clazyTreeModel->enableChecks(clazyChecks.split(',', QString::SkipEmptyParts));
+
+    syncClazyChecksGroupBox();
 
-    button->setChecked(true);
-    m_clazyChecksWidget->setEnabled(!config.isReadOnly());
+    const bool enabled = !config.isReadOnly();
+    m_clazyChecks->topicsResetButton->setEnabled(enabled);
+    m_clazyChecks->enableLowerLevelsCheckBox->setEnabled(enabled);
+    selectAll(m_clazyChecks->topicsView);
+    m_clazyChecks->topicsView->setEnabled(enabled);
+    m_clazyTreeModel->setEnabled(enabled);
+
+    connectClazyItemChanged();
+}
+
+void ClangDiagnosticConfigsWidget::syncClazyChecksGroupBox()
+{
+    const auto isHidden = [this](const QModelIndex &index) {
+        return !m_clazySortFilterProxyModel->filterAcceptsRow(index.row(), index.parent());
+    };
+    const bool hasEnabledButHidden = m_clazyTreeModel->hasEnabledButNotVisibleChecks(isHidden);
+    const QString title = hasEnabledButHidden ? tr("Checks (%1 enabled, some are filtered out)")
+                                              : tr("Checks (%1 enabled)");
+
+    const QStringList checks = m_clazyTreeModel->enabledChecks();
+    m_clazyChecks->checksGroupBox->setTitle(title.arg(checks.count()));
 }
 
 void ClangDiagnosticConfigsWidget::updateConfig(const ClangDiagnosticConfig &config)
@@ -599,12 +954,16 @@ void ClangDiagnosticConfigsWidget::disconnectClangTidyItemChanged()
                this, &ClangDiagnosticConfigsWidget::onClangTidyTreeChanged);
 }
 
-void ClangDiagnosticConfigsWidget::connectClazyRadioButtonClicked(QRadioButton *button)
+void ClangDiagnosticConfigsWidget::connectClazyItemChanged()
 {
-    connect(button,
-            &QRadioButton::clicked,
-            this,
-            &ClangDiagnosticConfigsWidget::onClazyRadioButtonChanged);
+    connect(m_clazyTreeModel.get(), &ClazyChecksTreeModel::dataChanged,
+            this, &ClangDiagnosticConfigsWidget::onClazyTreeChanged);
+}
+
+void ClangDiagnosticConfigsWidget::disconnectClazyItemChanged()
+{
+    disconnect(m_clazyTreeModel.get(), &ClazyChecksTreeModel::dataChanged,
+               this, &ClangDiagnosticConfigsWidget::onClazyTreeChanged);
 }
 
 void ClangDiagnosticConfigsWidget::connectConfigChooserCurrentIndex()
@@ -644,6 +1003,15 @@ ClangDiagnosticConfigs ClangDiagnosticConfigsWidget::customConfigs() const
     });
 }
 
+static void setupTreeView(QTreeView *view, QAbstractItemModel *model, int expandToDepth = 0)
+{
+    view->setModel(model);
+    view->expandToDepth(expandToDepth);
+    view->header()->setStretchLastSection(false);
+    view->header()->setSectionResizeMode(0, QHeaderView::Stretch);
+    view->setHeaderHidden(true);
+}
+
 void ClangDiagnosticConfigsWidget::setupTabs()
 {
     m_clangBaseChecks.reset(new CppTools::Ui::ClangBaseChecks);
@@ -653,20 +1021,45 @@ void ClangDiagnosticConfigsWidget::setupTabs()
     m_clazyChecks.reset(new CppTools::Ui::ClazyChecks);
     m_clazyChecksWidget = new QWidget();
     m_clazyChecks->setupUi(m_clazyChecksWidget);
-
-    connectClazyRadioButtonClicked(m_clazyChecks->clazyRadioDisabled);
-    connectClazyRadioButtonClicked(m_clazyChecks->clazyRadioLevel0);
-    connectClazyRadioButtonClicked(m_clazyChecks->clazyRadioLevel1);
-    connectClazyRadioButtonClicked(m_clazyChecks->clazyRadioLevel2);
-    connectClazyRadioButtonClicked(m_clazyChecks->clazyRadioLevel3);
+    m_clazySortFilterProxyModel = new ClazyChecksSortFilterModel(this);
+    m_clazySortFilterProxyModel->setSourceModel(m_clazyTreeModel.get());
+    setupTreeView(m_clazyChecks->checksView, m_clazySortFilterProxyModel, 2);
+    m_clazyChecks->checksView->setSortingEnabled(true);
+    m_clazyChecks->checksView->sortByColumn(0, Qt::AscendingOrder);
+    auto topicsModel = new QStringListModel(m_clazyTreeModel->topics().toList(), this);
+    topicsModel->sort(0);
+    m_clazyChecks->topicsView->setModel(topicsModel);
+    connect(m_clazyChecks->topicsResetButton, &QPushButton::clicked, [this](){
+        selectAll(m_clazyChecks->topicsView);
+    });
+    connect(m_clazyChecks->topicsView->selectionModel(),
+            &QItemSelectionModel::selectionChanged,
+            [this, topicsModel](const QItemSelection &, const QItemSelection &) {
+                const auto indexes = m_clazyChecks->topicsView->selectionModel()->selectedIndexes();
+                const QStringList topics
+                    = Utils::transform(indexes, [topicsModel](const QModelIndex &index) {
+                          return topicsModel->data(index).toString();
+                      });
+                m_clazySortFilterProxyModel->setTopics(topics);
+                this->syncClazyChecksGroupBox();
+            });
+
+    selectAll(m_clazyChecks->topicsView);
+    connect(m_clazyChecks->enableLowerLevelsCheckBox, &QCheckBox::stateChanged, [this](int) {
+        const bool enable = m_clazyChecks->enableLowerLevelsCheckBox->isChecked();
+        m_clazyTreeModel->setEnableLowerLevels(enable);
+        codeModelSettings()->setEnableLowerClazyLevels(
+            m_clazyChecks->enableLowerLevelsCheckBox->isChecked());
+    });
+    const Qt::CheckState checkEnableLowerClazyLevels
+        = codeModelSettings()->enableLowerClazyLevels() ? Qt::Checked : Qt::Unchecked;
+    m_clazyChecks->enableLowerLevelsCheckBox->setCheckState(checkEnableLowerClazyLevels);
 
     m_tidyChecks.reset(new CppTools::Ui::TidyChecks);
     m_tidyChecksWidget = new QWidget();
     m_tidyChecks->setupUi(m_tidyChecksWidget);
-    m_tidyChecks->checksPrefixesTree->setModel(m_tidyTreeModel.get());
-    m_tidyChecks->checksPrefixesTree->expandToDepth(0);
-    m_tidyChecks->checksPrefixesTree->header()->setStretchLastSection(false);
-    m_tidyChecks->checksPrefixesTree->header()->setSectionResizeMode(0, QHeaderView::Stretch);
+    setupTreeView(m_tidyChecks->checksPrefixesTree, m_tidyTreeModel.get());
+
     connect(m_tidyChecks->plainTextEditButton, &QPushButton::clicked, this, [this]() {
         const bool readOnly = selectedConfig().isReadOnly();
 
@@ -702,6 +1095,7 @@ void ClangDiagnosticConfigsWidget::setupTabs()
     });
 
     connectClangTidyItemChanged();
+    connectClazyItemChanged();
 
     m_ui->tabWidget->addTab(m_clangBaseChecksWidget, tr("Clang"));
     m_ui->tabWidget->addTab(m_tidyChecksWidget, tr("Clang-Tidy"));
diff --git a/src/plugins/cpptools/clangdiagnosticconfigswidget.h b/src/plugins/cpptools/clangdiagnosticconfigswidget.h
index 39753a74c6..502f5a62d5 100644
--- a/src/plugins/cpptools/clangdiagnosticconfigswidget.h
+++ b/src/plugins/cpptools/clangdiagnosticconfigswidget.h
@@ -38,7 +38,6 @@
 QT_BEGIN_NAMESPACE
 class QListWidgetItem;
 class QPushButton;
-class QRadioButton;
 QT_END_NAMESPACE
 
 namespace CppTools {
@@ -51,6 +50,8 @@ class TidyChecks;
 }
 
 class TidyChecksTreeModel;
+class ClazyChecksTreeModel;
+class ClazyChecksSortFilterModel;
 
 class CPPTOOLS_EXPORT ClangDiagnosticConfigsWidget : public QWidget
 {
@@ -73,8 +74,8 @@ private:
     void onRemoveButtonClicked();
     void onClangTidyModeChanged(int index);
     void onClangTidyTreeChanged();
+    void onClazyTreeChanged();
     void onClangTidyTreeItemClicked(const QModelIndex &index);
-    void onClazyRadioButtonChanged(bool checked);
 
     void onDiagnosticOptionsEdited();
 
@@ -83,6 +84,7 @@ private:
     void syncOtherWidgetsToComboBox();
     void syncClangTidyWidgets(const ClangDiagnosticConfig &config);
     void syncClazyWidgets(const ClangDiagnosticConfig &config);
+    void syncClazyChecksGroupBox();
     void syncTidyChecksToTree(const ClangDiagnosticConfig &config);
 
     void updateConfig(const CppTools::ClangDiagnosticConfig &config);
@@ -97,7 +99,8 @@ private:
     void connectClangTidyItemChanged();
     void disconnectClangTidyItemChanged();
 
-    void connectClazyRadioButtonClicked(QRadioButton *button);
+    void connectClazyItemChanged();
+    void disconnectClazyItemChanged();
 
     void connectConfigChooserCurrentIndex();
     void disconnectConfigChooserCurrentIndex();
@@ -114,6 +117,8 @@ private:
 
     std::unique_ptr<CppTools::Ui::ClazyChecks> m_clazyChecks;
     QWidget *m_clazyChecksWidget = nullptr;
+    std::unique_ptr<ClazyChecksTreeModel> m_clazyTreeModel;
+    ClazyChecksSortFilterModel *m_clazySortFilterProxyModel = nullptr;
 
     std::unique_ptr<CppTools::Ui::TidyChecks> m_tidyChecks;
     QWidget *m_tidyChecksWidget = nullptr;
diff --git a/src/plugins/cpptools/clangdiagnosticconfigswidget.ui b/src/plugins/cpptools/clangdiagnosticconfigswidget.ui
index e80ccef4fe..af4824ae22 100644
--- a/src/plugins/cpptools/clangdiagnosticconfigswidget.ui
+++ b/src/plugins/cpptools/clangdiagnosticconfigswidget.ui
@@ -105,7 +105,14 @@
       </layout>
      </item>
      <item>
-      <widget class="QTabWidget" name="tabWidget"/>
+      <widget class="QTabWidget" name="tabWidget">
+       <property name="minimumSize">
+        <size>
+         <width>700</width>
+         <height>500</height>
+        </size>
+       </property>
+      </widget>
      </item>
     </layout>
    </item>
diff --git a/src/plugins/cpptools/clazychecks.ui b/src/plugins/cpptools/clazychecks.ui
index 6502323360..34d9aaf0c8 100644
--- a/src/plugins/cpptools/clazychecks.ui
+++ b/src/plugins/cpptools/clazychecks.ui
@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>609</width>
-    <height>220</height>
+    <width>700</width>
+    <height>500</height>
    </rect>
   </property>
   <property name="sizePolicy">
@@ -23,7 +23,7 @@
    <item>
     <widget class="QLabel" name="label">
      <property name="text">
-      <string>Each level adds checks to the previous level. For more information, see &lt;a href=&quot;https://github.com/KDE/clazy&quot;&gt;clazy's homepage&lt;/a&gt;.</string>
+      <string>See &lt;a href=&quot;https://github.com/KDE/clazy&quot;&gt;clazy's homepage&lt;/a&gt; for more information.</string>
      </property>
      <property name="openExternalLinks">
       <bool>true</bool>
@@ -31,64 +31,74 @@
     </widget>
    </item>
    <item>
-    <widget class="QRadioButton" name="clazyRadioDisabled">
-     <property name="text">
-      <string>Disabled</string>
-     </property>
-    </widget>
-   </item>
-   <item>
-    <widget class="QRadioButton" name="clazyRadioLevel0">
-     <property name="toolTip">
-      <string/>
-     </property>
-     <property name="text">
-      <string>Level 0: No false positives</string>
-     </property>
-    </widget>
-   </item>
-   <item>
-    <widget class="QRadioButton" name="clazyRadioLevel1">
-     <property name="toolTip">
-      <string/>
-     </property>
-     <property name="text">
-      <string>Level 1: Very few false positives</string>
-     </property>
-    </widget>
-   </item>
-   <item>
-    <widget class="QRadioButton" name="clazyRadioLevel2">
-     <property name="toolTip">
-      <string/>
-     </property>
-     <property name="text">
-      <string>Level 2: More false positives</string>
-     </property>
-    </widget>
-   </item>
-   <item>
-    <widget class="QRadioButton" name="clazyRadioLevel3">
-     <property name="toolTip">
-      <string>Not always correct, possibly very noisy, might require a knowledgeable developer to review, might have a very big rate of false-positives, might have bugs.</string>
-     </property>
-     <property name="text">
-      <string>Level 3: Experimental checks</string>
-     </property>
-    </widget>
-   </item>
-   <item>
-    <spacer name="verticalSpacer">
-     <property name="orientation">
-      <enum>Qt::Vertical</enum>
-     </property>
-     <property name="sizeHint" stdset="0">
-      <size>
-       <width>20</width>
-       <height>34</height>
-      </size>
-     </property>
-    </spacer>
+    <layout class="QHBoxLayout" name="horizontalLayout">
+     <item>
+      <widget class="QGroupBox" name="groupBox">
+       <property name="sizePolicy">
+        <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+         <horstretch>0</horstretch>
+         <verstretch>0</verstretch>
+        </sizepolicy>
+       </property>
+       <property name="title">
+        <string>Topic Filter</string>
+       </property>
+       <layout class="QVBoxLayout" name="verticalLayout_3">
+        <item>
+         <widget class="QPushButton" name="topicsResetButton">
+          <property name="text">
+           <string>Reset to All</string>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QListView" name="topicsView">
+          <property name="sizePolicy">
+           <sizepolicy hsizetype="Preferred" vsizetype="Preferred">
+            <horstretch>0</horstretch>
+            <verstretch>0</verstretch>
+           </sizepolicy>
+          </property>
+          <property name="maximumSize">
+           <size>
+            <width>150</width>
+            <height>16777215</height>
+           </size>
+          </property>
+          <property name="editTriggers">
+           <set>QAbstractItemView::NoEditTriggers</set>
+          </property>
+         </widget>
+        </item>
+       </layout>
+      </widget>
+     </item>
+     <item>
+      <widget class="QGroupBox" name="checksGroupBox">
+       <property name="title">
+        <string>Checks</string>
+       </property>
+       <layout class="QVBoxLayout" name="verticalLayout_2">
+        <item>
+         <widget class="QCheckBox" name="enableLowerLevelsCheckBox">
+          <property name="toolTip">
+           <string>When enabling a level explicitly, also enable lower levels (Clazy semantic).</string>
+          </property>
+          <property name="text">
+           <string>Enable lower levels automatically</string>
+          </property>
+          <property name="checked">
+           <bool>true</bool>
+          </property>
+         </widget>
+        </item>
+        <item>
+         <widget class="QTreeView" name="checksView"/>
+        </item>
+       </layout>
+      </widget>
+     </item>
+    </layout>
    </item>
   </layout>
  </widget>
diff --git a/src/plugins/cpptools/cppcodemodelsettings.cpp b/src/plugins/cpptools/cppcodemodelsettings.cpp
index c5aee2089b..235066e6a0 100644
--- a/src/plugins/cpptools/cppcodemodelsettings.cpp
+++ b/src/plugins/cpptools/cppcodemodelsettings.cpp
@@ -64,6 +64,9 @@ static QString clangDiagnosticConfigsArrayClangTidyModeKey()
 static QString clangDiagnosticConfigsArrayClazyChecksKey()
 { return QLatin1String("clazyChecks"); }
 
+static QString enableLowerClazyLevelsKey()
+{ return QLatin1String("enableLowerClazyLevels"); }
+
 static QString pchUsageKey()
 { return QLatin1String(Constants::CPPTOOLS_MODEL_MANAGER_PCH_USAGE); }
 
@@ -124,6 +127,8 @@ void CppCodeModelSettings::fromSettings(QSettings *s)
             setClangDiagnosticConfigId(initialClangDiagnosticConfigId());
     }
 
+    setEnableLowerClazyLevels(s->value(enableLowerClazyLevelsKey(), true).toBool());
+
     const QVariant pchUsageVariant = s->value(pchUsageKey(), initialPchUsage());
     setPCHUsage(static_cast<PCHUsage>(pchUsageVariant.toInt()));
 
@@ -165,6 +170,7 @@ void CppCodeModelSettings::toSettings(QSettings *s)
     s->endArray();
 
     s->setValue(clangDiagnosticConfigKey(), clangDiagnosticConfigId().toSetting());
+    s->setValue(enableLowerClazyLevelsKey(), enableLowerClazyLevels());
     s->setValue(pchUsageKey(), pchUsage());
 
     s->setValue(interpretAmbiguousHeadersAsCHeadersKey(), interpretAmbigiousHeadersAsCHeaders());
@@ -256,3 +262,13 @@ void CppCodeModelSettings::setIndexerFileSizeLimitInMb(int sizeInMB)
 {
     m_indexerFileSizeLimitInMB = sizeInMB;
 }
+
+bool CppCodeModelSettings::enableLowerClazyLevels() const
+{
+    return m_enableLowerClazyLevels;
+}
+
+void CppCodeModelSettings::setEnableLowerClazyLevels(bool yesno)
+{
+    m_enableLowerClazyLevels = yesno;
+}
diff --git a/src/plugins/cpptools/cppcodemodelsettings.h b/src/plugins/cpptools/cppcodemodelsettings.h
index d1783711f1..b19d6e3e62 100644
--- a/src/plugins/cpptools/cppcodemodelsettings.h
+++ b/src/plugins/cpptools/cppcodemodelsettings.h
@@ -61,6 +61,9 @@ public:
     ClangDiagnosticConfigs clangCustomDiagnosticConfigs() const;
     void setClangCustomDiagnosticConfigs(const ClangDiagnosticConfigs &configs);
 
+    bool enableLowerClazyLevels() const;
+    void setEnableLowerClazyLevels(bool yesno);
+
     PCHUsage pchUsage() const;
     void setPCHUsage(PCHUsage pchUsage);
 
@@ -84,6 +87,7 @@ private:
     int m_indexerFileSizeLimitInMB = 5;
     ClangDiagnosticConfigs m_clangCustomDiagnosticConfigs;
     Core::Id m_clangDiagnosticConfigId;
+    bool m_enableLowerClazyLevels = true; // For UI behavior only
 };
 
 } // namespace CppTools
diff --git a/src/plugins/cpptools/cpptools.pro b/src/plugins/cpptools/cpptools.pro
index 8e81066123..a55e805af4 100644
--- a/src/plugins/cpptools/cpptools.pro
+++ b/src/plugins/cpptools/cpptools.pro
@@ -103,7 +103,8 @@ HEADERS += \
     cppmodelmanagerinterface.h \
     cppbuiltinmodelmanagersupport.h \
     headerpathfilter.h \
-    cppkitinfo.h
+    cppkitinfo.h \
+    cpptools_clazychecks.h
 
 SOURCES += \
     abstracteditorsupport.cpp \
diff --git a/src/plugins/cpptools/cpptools.qbs b/src/plugins/cpptools/cpptools.qbs
index d1d30296db..89062d3a21 100644
--- a/src/plugins/cpptools/cpptools.qbs
+++ b/src/plugins/cpptools/cpptools.qbs
@@ -158,6 +158,7 @@ Project {
             "cppsourceprocessor.h",
             "cpptools.qrc",
             "cpptools_clangtidychecks.h",
+            "cpptools_clazychecks.h",
             "cpptools_global.h",
             "cpptools_utils.h",
             "cpptoolsbridge.cpp",
diff --git a/src/plugins/cpptools/cpptools_clazychecks.h b/src/plugins/cpptools/cpptools_clazychecks.h
new file mode 100644
index 0000000000..1c60e4f893
--- /dev/null
+++ b/src/plugins/cpptools/cpptools_clazychecks.h
@@ -0,0 +1,130 @@
+/****************************************************************************
+**
+** Copyright (C) 2019 The Qt Company Ltd.
+** Contact: https://www.qt.io/licensing/
+**
+** This file is part of Qt Creator.
+**
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and The Qt Company. For licensing terms
+** and conditions see https://www.qt.io/terms-conditions. For further
+** information use the contact form at https://www.qt.io/contact-us.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3 as published by the Free Software
+** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
+** included in the packaging of this file. Please review the following
+** information to ensure the GNU General Public License requirements will
+** be met: https://www.gnu.org/licenses/gpl-3.0.html.
+**
+****************************************************************************/
+
+#pragma once
+
+#include <vector>
+
+namespace CppTools {
+namespace Constants {
+
+class ClazyCheckInfo
+{
+public:
+    bool isValid() const { return !name.isEmpty() && level >= -1; }
+
+    QString name;
+    int level = -1; // "Manual level"
+    QStringList topics;
+};
+using ClazyCheckInfos = std::vector<ClazyCheckInfo>;
+
+// CLANG-UPGRADE-CHECK: Run 'scripts/generateClazyChecks.py' after Clang upgrade to
+// update this header.
+static const ClazyCheckInfos CLAZY_CHECKS = {
+    {"qt-keywords", -1, {}},
+    {"ifndef-define-typo", -1, {"bug"}},
+    {"inefficient-qlist", -1, {"containers","performance"}},
+    {"isempty-vs-count", -1, {"readability"}},
+    {"qrequiredresult-candidates", -1, {"bug"}},
+    {"qstring-varargs", -1, {"bug"}},
+    {"qt4-qstring-from-array", -1, {"qt4","qstring"}},
+    {"tr-non-literal", -1, {"bug"}},
+    {"raw-environment-function", -1, {"bug"}},
+    {"container-inside-loop", -1, {"containers","performance"}},
+    {"qhash-with-char-pointer-key", -1, {"cpp","bug"}},
+    {"connect-by-name", 0, {"bug","readability"}},
+    {"connect-non-signal", 0, {"bug"}},
+    {"wrong-qevent-cast", 0, {"bug"}},
+    {"lambda-in-connect", 0, {"bug"}},
+    {"lambda-unique-connection", 0, {"bug"}},
+    {"qdatetime-utc", 0, {"performance"}},
+    {"qgetenv", 0, {"performance"}},
+    {"qstring-insensitive-allocation", 0, {"performance","qstring"}},
+    {"fully-qualified-moc-types", 0, {"bug","qml"}},
+    {"qvariant-template-instantiation", 0, {"performance"}},
+    {"unused-non-trivial-variable", 0, {"readability"}},
+    {"connect-not-normalized", 0, {"performance"}},
+    {"mutable-container-key", 0, {"containers","bug"}},
+    {"qenums", 0, {"deprecation"}},
+    {"qmap-with-pointer-key", 0, {"containers","performance"}},
+    {"qstring-ref", 0, {"performance","qstring"}},
+    {"strict-iterators", 0, {"containers","performance","bug"}},
+    {"writing-to-temporary", 0, {"bug"}},
+    {"container-anti-pattern", 0, {"containers","performance"}},
+    {"qcolor-from-literal", 0, {"performance"}},
+    {"qfileinfo-exists", 0, {"performance"}},
+    {"qstring-arg", 0, {"performance","qstring"}},
+    {"empty-qstringliteral", 0, {"performance"}},
+    {"qt-macros", 0, {"bug"}},
+    {"temporary-iterator", 0, {"containers","bug"}},
+    {"wrong-qglobalstatic", 0, {"performance"}},
+    {"lowercase-qml-type-name", 0, {"qml","bug"}},
+    {"auto-unexpected-qstringbuilder", 1, {"bug","qstring"}},
+    {"connect-3arg-lambda", 1, {"bug"}},
+    {"const-signal-or-slot", 1, {"readability","bug"}},
+    {"detaching-temporary", 1, {"containers","performance"}},
+    {"foreach", 1, {"containers","performance"}},
+    {"incorrect-emit", 1, {"readability"}},
+    {"inefficient-qlist-soft", 1, {"containers","performance"}},
+    {"install-event-filter", 1, {"bug"}},
+    {"non-pod-global-static", 1, {"performance"}},
+    {"post-event", 1, {"bug"}},
+    {"qdeleteall", 1, {"containers","performance"}},
+    {"qlatin1string-non-ascii", 1, {"bug","qstring"}},
+    {"qproperty-without-notify", 1, {"bug"}},
+    {"qstring-left", 1, {"bug","performance","qstring"}},
+    {"range-loop", 1, {"containers","performance"}},
+    {"returning-data-from-temporary", 1, {"bug"}},
+    {"rule-of-two-soft", 1, {"cpp","bug"}},
+    {"child-event-qobject-cast", 1, {"bug"}},
+    {"virtual-signal", 1, {"bug","readability"}},
+    {"overridden-signal", 1, {"bug","readability"}},
+    {"qhash-namespace", 1, {"bug"}},
+    {"skipped-base-method", 1, {"bug","cpp"}},
+    {"unneeded-cast", 3, {"cpp","readability"}},
+    {"ctor-missing-parent-argument", 2, {"bug"}},
+    {"base-class-event", 2, {"bug"}},
+    {"copyable-polymorphic", 2, {"cpp","bug"}},
+    {"function-args-by-ref", 2, {"cpp","performance"}},
+    {"function-args-by-value", 2, {"cpp","performance"}},
+    {"global-const-char-pointer", 2, {"cpp","performance"}},
+    {"implicit-casts", 2, {"cpp","bug"}},
+    {"missing-qobject-macro", 2, {"bug"}},
+    {"missing-typeinfo", 2, {"containers","performance"}},
+    {"old-style-connect", 2, {"performance"}},
+    {"qstring-allocations", 2, {"performance","qstring"}},
+    {"returning-void-expression", 2, {"readability","cpp"}},
+    {"rule-of-three", 2, {"cpp","bug"}},
+    {"virtual-call-ctor", 2, {"cpp","bug"}},
+    {"static-pmf", 2, {"bug"}},
+    {"assert-with-side-effects", 3, {"bug"}},
+    {"detaching-member", 3, {"containers","performance"}},
+    {"thread-with-slots", 3, {"bug"}},
+    {"reserve-candidates", 3, {"containers"}}
+};
+
+} // namespace Constants
+} // namespace CppTools
diff --git a/src/plugins/cpptools/cpptoolsconstants.h b/src/plugins/cpptools/cpptoolsconstants.h
index 645b59af02..07c6c64e7d 100644
--- a/src/plugins/cpptools/cpptoolsconstants.h
+++ b/src/plugins/cpptools/cpptoolsconstants.h
@@ -101,5 +101,8 @@ const char SYMBOLS_FIND_FILTER_DISPLAY_NAME[] = QT_TRANSLATE_NOOP("CppTools", "C
 constexpr const char TIDY_DOCUMENTATION_URL_TEMPLATE[]
     = "https://releases.llvm.org/7.0.0/tools/clang/tools/extra/docs/clang-tidy/checks/%1.html";
 
+constexpr const char CLAZY_DOCUMENTATION_URL_TEMPLATE[]
+    = "https://github.com/KDE/clazy/blob/master/docs/checks/README-%1.md";
+
 } // namespace Constants
 } // namespace CppTools