ClangFormat: Move the functions from clangformatutils

- Moved the functions from clangformatutils to the places where
it is belong

Change-Id: Ia4108c5b096610170e0f9d16d15d40d5538ffbdc
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/clangformat/clangformatconfigwidget.cpp

@@ -6,7 +6,6 @@
 #include "clangformatconstants.h"
 #include "clangformatindenter.h"
 #include "clangformatfile.h"
-#include "clangformatsettings.h"
 #include "clangformatutils.h"
 
 // the file was generated by scripts/generateClangFormatChecksLayout.py
@@ -150,6 +149,62 @@ void ClangFormatConfigWidget::connectChecks()
     }
 }
 
+static clang::format::FormatStyle constructStyle(const QByteArray &baseStyle = QByteArray())
+{
+    if (!baseStyle.isEmpty()) {
+        // Try to get the style for this base style.
+        llvm::Expected<clang::format::FormatStyle> style
+            = clang::format::getStyle(baseStyle.toStdString(), "dummy.cpp", baseStyle.toStdString());
+        if (style)
+            return *style;
+
+        handleAllErrors(style.takeError(), [](const llvm::ErrorInfoBase &) {
+            // do nothing
+        });
+        // Fallthrough to the default style.
+    }
+    return qtcStyle();
+}
+
+Utils::FilePath ClangFormatConfigWidget::globalPath()
+{
+    return Core::ICore::userResourcePath();
+}
+
+Utils::FilePath ClangFormatConfigWidget::projectPath()
+{
+    if (m_project)
+        return globalPath().pathAppended("clang-format/" + projectUniqueId(m_project));
+
+    return Utils::FilePath();
+}
+
+void ClangFormatConfigWidget::createStyleFileIfNeeded(bool isGlobal)
+{
+    const FilePath path = isGlobal ? globalPath() : projectPath();
+    const FilePath configFile = path / Constants::SETTINGS_FILE_NAME;
+
+    if (configFile.exists())
+        return;
+
+    QDir().mkpath(path.toString());
+    if (!isGlobal) {
+        FilePath possibleProjectConfig = m_project->rootProjectDirectory()
+                                         / Constants::SETTINGS_FILE_NAME;
+        if (possibleProjectConfig.exists()) {
+            // Just copy th .clang-format if current project has one.
+            possibleProjectConfig.copyFile(configFile);
+            return;
+        }
+    }
+
+    std::fstream newStyleFile(configFile.toString().toStdString(), std::fstream::out);
+    if (newStyleFile.is_open()) {
+        newStyleFile << clang::format::configurationAsText(constructStyle());
+        newStyleFile.close();
+    }
+}
+
 void ClangFormatConfigWidget::showOrHideWidgets()
 {
     auto verticalLayout = qobject_cast<QVBoxLayout *>(layout());
@@ -244,6 +299,38 @@ static void fillComboBoxOrLineEdit(QObject *object, const std::string &text, siz
     lineEdit->setText(QString::fromStdString(value));
 }
 
+std::string ClangFormatConfigWidget::readFile(const QString &path)
+{
+    const std::string defaultStyle = clang::format::configurationAsText(qtcStyle());
+
+    QFile file(path);
+    if (!file.open(QFile::ReadOnly))
+        return defaultStyle;
+
+    const std::string content = file.readAll().toStdString();
+    file.close();
+
+    clang::format::FormatStyle style;
+    style.Language = clang::format::FormatStyle::LK_Cpp;
+    const std::error_code error = clang::format::parseConfiguration(content, &style);
+    QTC_ASSERT(error.value() == static_cast<int>(clang::format::ParseError::Success),
+               return defaultStyle);
+
+    addQtcStatementMacros(style);
+    std::string settings = clang::format::configurationAsText(style);
+
+    // Needed workaround because parseConfiguration remove BasedOnStyle field
+    // ToDo: standardize this behavior for future
+    const size_t index = content.find("BasedOnStyle");
+    if (index != std::string::npos) {
+        const size_t size = content.find("\n", index) - index;
+        const size_t insert_index = settings.find("\n");
+        settings.insert(insert_index, "\n" + content.substr(index, size));
+    }
+
+    return settings;
+}
+
 void ClangFormatConfigWidget::fillTable()
 {
     Utils::GuardLocker locker(m_ignoreChanges);