ClangFormat: Synchronize with C++ code style settings

And remove UI for default code style settings because
it does not affect anything when ClangFormat plugin is
enabled.

Change-Id: Ie348b7d2691b09ea2b4868da987f2a27347ea0f3
Reviewed-by: Marco Bubke <marco.bubke@qt.io>

9 files changed, 254 insertions, 70 deletions

diff --git a/src/plugins/clangformat/clangformat.pro b/src/plugins/clangformat/clangformat.pro
index 74331b9e5f..70eefe17f4 100644
--- a/src/plugins/clangformat/clangformat.pro
+++ b/src/plugins/clangformat/clangformat.pro
@@ -18,7 +18,8 @@ QMAKE_CXXFLAGS += $$LLVM_CXXFLAGS
 SOURCES = \
     clangformatconfigwidget.cpp \
     clangformatindenter.cpp \
-    clangformatplugin.cpp
+    clangformatplugin.cpp \
+    clangformatutils.cpp
 
 HEADERS = \
     clangformatconfigwidget.h \
diff --git a/src/plugins/clangformat/clangformatconfigwidget.cpp b/src/plugins/clangformat/clangformatconfigwidget.cpp
index 620989d02b..213fd88a1a 100644
--- a/src/plugins/clangformat/clangformatconfigwidget.cpp
+++ b/src/plugins/clangformat/clangformatconfigwidget.cpp
@@ -138,7 +138,7 @@ void ClangFormatConfigWidget::initialize()
 
         connect(m_ui->createFileButton, &QPushButton::clicked,
                 this, [this]() {
-            createStyleFileIfNeeded(m_project->projectDirectory());
+            createStyleFileIfNeeded(m_project->projectDirectory(), false);
             initialize();
         });
         return;
@@ -146,10 +146,8 @@ void ClangFormatConfigWidget::initialize()
 
     m_ui->createFileButton->hide();
 
-    std::string testFilePath;
     if (m_project) {
         m_ui->projectHasClangFormat->hide();
-        testFilePath = m_project->projectDirectory().appendPath("t.cpp").toString().toStdString();
         connect(m_ui->applyButton, &QPushButton::clicked, this, &ClangFormatConfigWidget::apply);
     } else {
         const Project *currentProject = SessionManager::startupProject();
@@ -162,34 +160,20 @@ void ClangFormatConfigWidget::initialize()
                        "and can be configured in Projects > Clang Format."));
         }
         const QString settingsDir = Core::ICore::userResourcePath();
-        createStyleFileIfNeeded(Utils::FileName::fromString(settingsDir));
-        testFilePath = settingsDir.toStdString() + "/t.cpp";
+        createStyleFileIfNeeded(Utils::FileName::fromString(settingsDir), true);
         m_ui->applyButton->hide();
     }
 
-    fillTable(testFilePath);
+    fillTable();
 }
 
-void ClangFormatConfigWidget::fillTable(const std::string &testFilePath)
+void ClangFormatConfigWidget::fillTable()
 {
-    llvm::Expected<clang::format::FormatStyle> formatStyle =
-        clang::format::getStyle("file", testFilePath, "LLVM");
-    std::string configText;
-    bool brokenConfig = false;
-    if (!formatStyle) {
-        handleAllErrors(formatStyle.takeError(), [](const llvm::ErrorInfoBase &) {
-            // do nothing
-        });
-        configText = clang::format::configurationAsText(clang::format::getLLVMStyle());
-        brokenConfig = true;
-    } else {
-        configText = clang::format::configurationAsText(*formatStyle);
-    }
+    clang::format::FormatStyle style = m_project ? currentProjectStyle() : currentGlobalStyle();
 
+    std::string configText = clang::format::configurationAsText(style);
     std::istringstream stream(configText);
     readTable(m_ui->clangFormatOptionsTable, stream);
-    if (brokenConfig)
-        apply();
 
 }
 
diff --git a/src/plugins/clangformat/clangformatconfigwidget.h b/src/plugins/clangformat/clangformatconfigwidget.h
index 5694bd820b..951e0cc408 100644
--- a/src/plugins/clangformat/clangformatconfigwidget.h
+++ b/src/plugins/clangformat/clangformatconfigwidget.h
@@ -49,7 +49,7 @@ public:
 
 private:
     void initialize();
-    void fillTable(const std::string &testFilePath);
+    void fillTable();
 
     ProjectExplorer::Project *m_project;
     std::unique_ptr<Ui::ClangFormatConfigWidget> m_ui;
diff --git a/src/plugins/clangformat/clangformatindenter.cpp b/src/plugins/clangformat/clangformatindenter.cpp
index 20c4c2c3e9..ddd786fc22 100644
--- a/src/plugins/clangformat/clangformatindenter.cpp
+++ b/src/plugins/clangformat/clangformatindenter.cpp
@@ -30,10 +30,7 @@
 #include <clang/Format/Format.h>
 #include <clang/Tooling/Core/Replacement.h>
 
-#include <coreplugin/icore.h>
 #include <cpptools/cppmodelmanager.h>
-#include <projectexplorer/project.h>
-#include <projectexplorer/session.h>
 #include <texteditor/textdocument.h>
 #include <texteditor/texteditor.h>
 
@@ -95,31 +92,6 @@ Replacements filteredReplacements(const Replacements &replacements,
     return filtered;
 }
 
-Utils::FileName styleConfigPath()
-{
-    const Project *project = SessionManager::startupProject();
-    if (project && project->projectDirectory().appendPath(".clang-format").exists())
-        return project->projectDirectory();
-
-    return Utils::FileName::fromString(Core::ICore::userResourcePath());
-}
-
-FormatStyle formatStyle(Utils::FileName styleConfigPath)
-{
-    createStyleFileIfNeeded(styleConfigPath);
-
-    Expected<FormatStyle> style = format::getStyle(
-                "file", styleConfigPath.appendPath("test.cpp").toString().toStdString(), "LLVM");
-    if (style)
-        return *style;
-
-    handleAllErrors(style.takeError(), [](const ErrorInfoBase &) {
-        // do nothing
-    });
-
-    return format::getLLVMStyle();
-}
-
 void trimFirstNonEmptyBlock(const QTextBlock &currentBlock)
 {
     QTextBlock prevBlock = currentBlock.previous();
@@ -198,8 +170,7 @@ Replacements replacements(QByteArray buffer,
                           const QTextBlock *block = nullptr,
                           const QChar &typedChar = QChar::Null)
 {
-    Utils::FileName stylePath = styleConfigPath();
-    FormatStyle style = formatStyle(stylePath);
+    FormatStyle style = currentStyle();
 
     int extraOffset = 0;
     if (block) {
@@ -227,6 +198,7 @@ Replacements replacements(QByteArray buffer,
                                static_cast<unsigned int>(utf8Length)}};
     FormattingAttemptStatus status;
 
+    Utils::FileName stylePath = currentStyleConfigPath();
     const std::string assumedFilePath
             = stylePath.appendPath("test.cpp").toString().toStdString();
     Replacements replacements = reformat(style, buffer.data(), ranges, assumedFilePath, &status);
@@ -451,7 +423,7 @@ int ClangFormatIndenter::indentFor(const QTextBlock &block, const TextEditor::Ta
 
 TabSettings ClangFormatIndenter::tabSettings() const
 {
-    FormatStyle style = formatStyle(styleConfigPath());
+    FormatStyle style = currentStyle();
     TabSettings tabSettings;
 
     switch (style.UseTab) {
@@ -468,8 +440,8 @@ TabSettings ClangFormatIndenter::tabSettings() const
     tabSettings.m_tabSize = static_cast<int>(style.TabWidth);
     tabSettings.m_indentSize = static_cast<int>(style.IndentWidth);
 
-    if (style.AlignAfterOpenBracket)
-        tabSettings.m_continuationAlignBehavior = TabSettings::ContinuationAlignWithSpaces;
+    if (style.AlignAfterOpenBracket == FormatStyle::BAS_DontAlign)
+        tabSettings.m_continuationAlignBehavior = TabSettings::NoContinuationAlign;
     else
         tabSettings.m_continuationAlignBehavior = TabSettings::ContinuationAlignWithIndent;
 
diff --git a/src/plugins/clangformat/clangformatplugin.cpp b/src/plugins/clangformat/clangformatplugin.cpp
index f421b686ac..02f107f40c 100644
--- a/src/plugins/clangformat/clangformatplugin.cpp
+++ b/src/plugins/clangformat/clangformatplugin.cpp
@@ -45,8 +45,12 @@
 #include <projectexplorer/projectpanelfactory.h>
 #include <projectexplorer/target.h>
 
+#include <texteditor/texteditorsettings.h>
+
 #include <clang/Format/Format.h>
 
+#include <utils/algorithm.h>
+
 #include <QAction>
 #include <QDebug>
 #include <QMainWindow>
@@ -95,6 +99,24 @@ private:
 ClangFormatPlugin::ClangFormatPlugin() = default;
 ClangFormatPlugin::~ClangFormatPlugin() = default;
 
+static void disableCppCodeStyle()
+{
+    using namespace TextEditor;
+    TextEditorSettings::unregisterCodeStyleFactory(CppTools::Constants::CPP_SETTINGS_ID);
+    TextEditorSettings::unregisterCodeStylePool(CppTools::Constants::CPP_SETTINGS_ID);
+    TextEditorSettings::unregisterCodeStyle(CppTools::Constants::CPP_SETTINGS_ID);
+
+    QList<Core::IOptionsPage *> pages = Core::IOptionsPage::allOptionsPages();
+    int codeStylePageIndex = Utils::indexOf(pages, [](Core::IOptionsPage *page) {
+        return page->id() == CppTools::Constants::CPP_CODE_STYLE_SETTINGS_ID;
+    });
+    if (codeStylePageIndex >= 0) {
+        auto *page = pages[codeStylePageIndex];
+        page->finish();
+        page->deleteLater();
+    }
+}
+
 bool ClangFormatPlugin::initialize(const QStringList &arguments, QString *errorString)
 {
     Q_UNUSED(arguments);
@@ -113,6 +135,8 @@ bool ClangFormatPlugin::initialize(const QStringList &arguments, QString *errorS
     CppTools::CppModelManager::instance()->setCppIndenterCreator([]() {
         return new ClangFormatIndenter();
     });
+
+    disableCppCodeStyle();
 #endif
     return true;
 }
diff --git a/src/plugins/clangformat/clangformatutils.cpp b/src/plugins/clangformat/clangformatutils.cpp
new file mode 100644
index 0000000000..4e901ab563
--- /dev/null
+++ b/src/plugins/clangformat/clangformatutils.cpp
@@ -0,0 +1,179 @@
+/****************************************************************************
+**
+** Copyright (C) 2018 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.
+**
+****************************************************************************/
+
+#include "clangformatutils.h"
+
+#include <coreplugin/icore.h>
+#include <cpptools/cppcodestylesettings.h>
+#include <texteditor/tabsettings.h>
+#include <projectexplorer/project.h>
+#include <projectexplorer/session.h>
+
+using namespace clang;
+using namespace format;
+using namespace llvm;
+using namespace CppTools;
+using namespace ProjectExplorer;
+using namespace TextEditor;
+
+namespace ClangFormat {
+
+static void applyTabSettings(clang::format::FormatStyle &style, const TabSettings &settings)
+{
+    style.IndentWidth = static_cast<unsigned>(settings.m_indentSize);
+    style.TabWidth = static_cast<unsigned>(settings.m_tabSize);
+
+    if (settings.m_tabPolicy == TabSettings::TabsOnlyTabPolicy)
+        style.UseTab = FormatStyle::UT_Always;
+    else if (settings.m_tabPolicy == TabSettings::SpacesOnlyTabPolicy)
+        style.UseTab = FormatStyle::UT_Never;
+    else
+        style.UseTab = FormatStyle::UT_ForContinuationAndIndentation;
+
+    if (settings.m_continuationAlignBehavior == TabSettings::NoContinuationAlign) {
+        style.ContinuationIndentWidth = 0;
+        style.AlignAfterOpenBracket = FormatStyle::BAS_DontAlign;
+    } else {
+        style.ContinuationIndentWidth = style.IndentWidth;
+        style.AlignAfterOpenBracket = FormatStyle::BAS_Align;
+    }
+}
+
+static void applyCppCodeStyleSettings(clang::format::FormatStyle &style,
+                                      const CppCodeStyleSettings &settings)
+{
+    style.IndentCaseLabels = settings.indentSwitchLabels;
+    style.AlignOperands = settings.alignAssignments;
+    style.NamespaceIndentation = FormatStyle::NI_None;
+    if (settings.indentNamespaceBody)
+        style.NamespaceIndentation = FormatStyle::NI_All;
+
+    style.BraceWrapping.IndentBraces = false;
+    if (settings.indentBlockBraces) {
+        if (settings.indentClassBraces && settings.indentEnumBraces
+                && settings.indentNamespaceBraces && settings.indentFunctionBraces) {
+            style.BraceWrapping.IndentBraces = true;
+        } else {
+            style.BreakBeforeBraces = FormatStyle::BS_GNU;
+        }
+    }
+
+    if (settings.bindStarToIdentifier || settings.bindStarToRightSpecifier)
+        style.PointerAlignment = FormatStyle::PAS_Right;
+    else
+        style.PointerAlignment = FormatStyle::PAS_Left;
+
+    style.AccessModifierOffset = settings.indentAccessSpecifiers
+            ? 0
+            : - static_cast<int>(style.IndentWidth);
+}
+
+static Utils::FileName projectStylePath()
+{
+    const Project *project = SessionManager::startupProject();
+    if (project)
+        return project->projectDirectory();
+
+    return Utils::FileName();
+}
+
+static Utils::FileName globalStylePath()
+{
+    return Utils::FileName::fromString(Core::ICore::userResourcePath());
+}
+
+Utils::FileName currentStyleConfigPath()
+{
+    Utils::FileName path = projectStylePath();
+    if (!path.isEmpty())
+        return path;
+
+    return globalStylePath();
+}
+
+static clang::format::FormatStyle constructStyle(bool isGlobal)
+{
+    FormatStyle style = getLLVMStyle();
+    const CppCodeStyleSettings codeStyleSettings = isGlobal
+            ? CppCodeStyleSettings::currentGlobalCodeStyle()
+            : CppCodeStyleSettings::currentProjectCodeStyle();
+    const TabSettings tabSettings = isGlobal
+            ? CppCodeStyleSettings::currentGlobalTabSettings()
+            : CppCodeStyleSettings::currentProjectTabSettings();
+
+    applyTabSettings(style, tabSettings);
+    applyCppCodeStyleSettings(style, codeStyleSettings);
+
+    return style;
+}
+
+void createStyleFileIfNeeded(Utils::FileName styleConfigPath, bool isGlobal)
+{
+    const QString configFile = styleConfigPath.appendPath(".clang-format").toString();
+    if (QFile::exists(configFile))
+        return;
+
+    std::fstream newStyleFile(configFile.toStdString(), std::fstream::out);
+    if (newStyleFile.is_open()) {
+        newStyleFile << clang::format::configurationAsText(constructStyle(isGlobal));
+        newStyleFile.close();
+    }
+}
+
+static clang::format::FormatStyle currentStyle(bool isGlobal)
+{
+    Utils::FileName styleConfigPath = isGlobal ? globalStylePath() : projectStylePath();
+    createStyleFileIfNeeded(styleConfigPath, isGlobal);
+
+    Expected<FormatStyle> style = format::getStyle(
+                "file", styleConfigPath.appendPath("test.cpp").toString().toStdString(), "LLVM");
+    if (style)
+        return *style;
+
+    handleAllErrors(style.takeError(), [](const ErrorInfoBase &) {
+        // do nothing
+    });
+
+    return constructStyle(isGlobal);
+}
+
+clang::format::FormatStyle currentProjectStyle()
+{
+    return currentStyle(false);
+}
+
+clang::format::FormatStyle currentGlobalStyle()
+{
+    return currentStyle(true);
+}
+
+clang::format::FormatStyle currentStyle()
+{
+    const bool isGlobal = (CppCodeStyleSettings::currentProjectCodeStyle()
+                           == CppCodeStyleSettings::currentGlobalCodeStyle());
+    return currentStyle(isGlobal);
+}
+
+}
diff --git a/src/plugins/clangformat/clangformatutils.h b/src/plugins/clangformat/clangformatutils.h
index ad4e21f889..8634685971 100644
--- a/src/plugins/clangformat/clangformatutils.h
+++ b/src/plugins/clangformat/clangformatutils.h
@@ -34,18 +34,12 @@
 
 namespace ClangFormat {
 
-inline void createStyleFileIfNeeded(Utils::FileName styleConfigPath)
-{
-    const QString configFile = styleConfigPath.appendPath(".clang-format").toString();
-    if (QFile::exists(configFile))
-        return;
-
-    clang::format::FormatStyle newStyle = clang::format::getLLVMStyle();
-    std::fstream newStyleFile(configFile.toStdString(), std::fstream::out);
-    if (newStyleFile.is_open()) {
-        newStyleFile << clang::format::configurationAsText(newStyle);
-        newStyleFile.close();
-    }
-}
+void createStyleFileIfNeeded(Utils::FileName styleConfigPath, bool isGlobal);
+
+clang::format::FormatStyle currentProjectStyle();
+clang::format::FormatStyle currentGlobalStyle();
+
+Utils::FileName currentStyleConfigPath();
+clang::format::FormatStyle currentStyle();
 
 }
diff --git a/src/plugins/cpptools/cppcodestylesettings.cpp b/src/plugins/cpptools/cppcodestylesettings.cpp
index 06d396e59c..723ae2c222 100644
--- a/src/plugins/cpptools/cppcodestylesettings.cpp
+++ b/src/plugins/cpptools/cppcodestylesettings.cpp
@@ -33,6 +33,8 @@
 #include <projectexplorer/project.h>
 #include <projectexplorer/projecttree.h>
 
+#include <texteditor/tabsettings.h>
+
 #include <cplusplus/Overview.h>
 
 #include <utils/qtcassert.h>
@@ -226,6 +228,31 @@ CppCodeStyleSettings CppCodeStyleSettings::currentGlobalCodeStyle()
     return cppCodeStylePreferences->currentCodeStyleSettings();
 }
 
+TextEditor::TabSettings CppCodeStyleSettings::currentProjectTabSettings()
+{
+    ProjectExplorer::Project *project = ProjectExplorer::ProjectTree::currentProject();
+    if (!project)
+        return currentGlobalTabSettings();
+
+    ProjectExplorer::EditorConfiguration *editorConfiguration = project->editorConfiguration();
+    QTC_ASSERT(editorConfiguration, return currentGlobalTabSettings());
+
+    TextEditor::ICodeStylePreferences *codeStylePreferences
+        = editorConfiguration->codeStyle(CppTools::Constants::CPP_SETTINGS_ID);
+    QTC_ASSERT(codeStylePreferences, return currentGlobalTabSettings());
+    return codeStylePreferences->tabSettings();
+}
+
+TextEditor::TabSettings CppCodeStyleSettings::currentGlobalTabSettings()
+{
+    CppTools::CppCodeStylePreferences *cppCodeStylePreferences
+            = CppTools::CppToolsSettings::instance()->cppCodeStyle();
+    QTC_ASSERT(cppCodeStylePreferences, return TextEditor::TabSettings());
+
+    return cppCodeStylePreferences->tabSettings();
+}
+
+
 static void configureOverviewWithCodeStyleSettings(CPlusPlus::Overview &overview,
                                                    const CppCodeStyleSettings &settings)
 {
diff --git a/src/plugins/cpptools/cppcodestylesettings.h b/src/plugins/cpptools/cppcodestylesettings.h
index f69d72d0ab..4af18fbdbc 100644
--- a/src/plugins/cpptools/cppcodestylesettings.h
+++ b/src/plugins/cpptools/cppcodestylesettings.h
@@ -34,6 +34,7 @@ class QSettings;
 QT_END_NAMESPACE
 
 namespace CPlusPlus { class Overview; }
+namespace TextEditor { class TabSettings; }
 
 namespace CppTools {
 
@@ -94,6 +95,8 @@ public:
 
     static CppCodeStyleSettings currentProjectCodeStyle();
     static CppCodeStyleSettings currentGlobalCodeStyle();
+    static TextEditor::TabSettings currentProjectTabSettings();
+    static TextEditor::TabSettings currentGlobalTabSettings();
 
     /*! Returns an Overview configured by the current project's code style.