ClangFormat: Add the logical settings management

Now there are changeable and unchangeable settings,
as it works for usual codestyle settings.
They save parallel with codestyle settings but in another dir.
In general, the behavior became similar to usual codestyle settings.

ToDo: Make indenter use this settings instead standard one and
instead project settings when "override" checkbox is checked.

Change-Id: I639dbda296932bf9b967a11f1cc4fda120415ed9
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>

src/plugins/clangformat/clangformatfile.cpp

@@ -25,6 +25,7 @@
 
 #include "clangformatfile.h"
 #include "clangformatsettings.h"
+#include "clangformatutils.h"
 #include <cppeditor/cppcodestylesettings.h>
 #include <projectexplorer/project.h>
 #include <texteditor/tabsettings.h>
@@ -34,11 +35,18 @@
 
 using namespace ClangFormat;
 
-ClangFormatFile::ClangFormatFile(Utils::FilePath filePath)
+ClangFormatFile::ClangFormatFile(Utils::FilePath filePath, bool isReadOnly)
     : m_filePath(filePath)
+    , m_isReadOnly(isReadOnly)
 {
     if (!m_filePath.exists()) {
-        resetStyleToLLVM();
+        // create file and folder
+        m_filePath.parentDir().createDir();
+        std::fstream newStyleFile(m_filePath.path().toStdString(), std::fstream::out);
+        if (newStyleFile.is_open()) {
+            newStyleFile.close();
+        }
+        resetStyleToQtC();
         return;
     }
 
@@ -46,7 +54,7 @@ ClangFormatFile::ClangFormatFile(Utils::FilePath filePath)
     const std::error_code error
         = clang::format::parseConfiguration(m_filePath.fileContents().toStdString(), &m_style);
     if (error.value() != static_cast<int>(clang::format::ParseError::Success)) {
-        resetStyleToLLVM();
+        resetStyleToQtC();
     }
 }
 
@@ -65,10 +73,15 @@ void ClangFormatFile::setStyle(clang::format::FormatStyle style)
     saveNewFormat();
 }
 
-void ClangFormatFile::resetStyleToLLVM()
+bool ClangFormatFile::isReadOnly() const
 {
-    m_style = clang::format::getLLVMStyle();
-    saveNewFormat();
+    return m_isReadOnly;
+}
+
+void ClangFormatFile::resetStyleToQtC()
+{
+    m_style = qtcStyle();
+    saveStyleToFile(m_style, m_filePath);
 }
 
 void ClangFormatFile::setBasedOnStyle(QString styleName)
@@ -107,17 +120,17 @@ QString ClangFormatFile::changeFields(QList<Field> fields)
 
 void ClangFormatFile::saveNewFormat()
 {
-    std::string style = clang::format::configurationAsText(m_style);
+    if (m_isReadOnly)
+        return;
 
-    // workaround: configurationAsText() add comment "# " before BasedOnStyle line
-    const int pos = style.find("# BasedOnStyle");
-    if (pos != int(std::string::npos))
-        style.erase(pos, 2);
-    m_filePath.writeFileContents(QByteArray::fromStdString(style));
+    saveStyleToFile(m_style, m_filePath);
 }
 
 void ClangFormatFile::saveNewFormat(QByteArray style)
 {
+    if (m_isReadOnly)
+        return;
+
     m_filePath.writeFileContents(style);
 }