ClangFormat: Start to use new file management

- Indenter uses .clang-format file from a dir of
editing file or from a parent dir. If there is no
such file then indenter starts to use file from a dir
with the name current CodeStyle settings.
- Test fixed

ToDo: Add file absentness processing in case of import

Change-Id: If09ef0c598899856b948c214e524bcfd5dad76e2
Reviewed-by: <github-actions-qt-creator@cristianadam.eu>
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/clangformat/clangformatbaseindenter.cpp

@@ -24,7 +24,11 @@
 ****************************************************************************/
 
 #include "clangformatbaseindenter.h"
+#include "clangformatconstants.h"
 #include "clangformatutils.h"
+#include <coreplugin/icore.h>
+#include <texteditor/texteditorsettings.h>
+#include <texteditor/icodestylepreferences.h>
 
 #include <clang/Tooling/Core/Replacement.h>
 
@@ -728,8 +732,22 @@ void ClangFormatBaseIndenter::autoIndent(const QTextCursor &cursor,
 clang::format::FormatStyle ClangFormatBaseIndenter::styleForFile() const
 {
     llvm::Expected<clang::format::FormatStyle> style
-        = clang::format::getStyle("file", m_fileName.toString().toStdString(), "none");
+        = clang::format::getStyle("file", m_fileName.path().toStdString(), "none");
+
     if (style) {
+        if (*style == clang::format::getNoStyle()) {
+            Utils::FilePath filePath = filePathToCurrentSettings(
+                TextEditor::TextEditorSettings::codeStyle("Cpp")->currentPreferences());
+
+            clang::format::FormatStyle style;
+            style.Language = clang::format::FormatStyle::LK_Cpp;
+            const std::error_code error
+                = clang::format::parseConfiguration(filePath.fileContents().toStdString(), &style);
+            QTC_ASSERT(error.value() == static_cast<int>(clang::format::ParseError::Success),
+                       return qtcStyle());
+
+            return style;
+        }
         addQtcStatementMacros(*style);
         return *style;
     }

src/plugins/clangformat/clangformatbaseindenter.h

@@ -68,8 +68,9 @@ public:
 
     Utils::optional<int> margin() const override;
 
+    clang::format::FormatStyle styleForFile() const;
+
 protected:
-    virtual clang::format::FormatStyle styleForFile() const;
     virtual bool formatCodeInsteadOfIndent() const { return false; }
     virtual bool formatWhileTyping() const { return false; }
     virtual int lastSaveRevision() const { return 0; }

src/plugins/clangformat/clangformatconfigwidget.cpp

@@ -113,11 +113,8 @@ ClangFormatConfigWidget::ClangFormatConfigWidget(TextEditor::ICodeStylePreferenc
     m_ui->setupUi(this);
     setEnabled(!codeStyle->isReadOnly());
 
-    Utils::FilePath filePath = Core::ICore::userResourcePath();
+    m_config = std::make_unique<ClangFormatFile>(filePathToCurrentSettings(codeStyle),
-    filePath = filePath / "clang-format/"
+                                                 codeStyle->isReadOnly());
-               / Utils::FileUtils::fileSystemFriendlyName(codeStyle->displayName())
-               / QLatin1String(Constants::SETTINGS_FILE_NAME);
-    m_config = std::make_unique<ClangFormatFile>(filePath, codeStyle->isReadOnly());
 
     initChecksAndPreview();
     showCombobox();

src/plugins/clangformat/clangformatindenter.cpp

@@ -40,11 +40,6 @@ ClangFormatIndenter::ClangFormatIndenter(QTextDocument *doc)
     : ClangFormatBaseIndenter(doc)
 {}
 
-FormatStyle ClangFormatIndenter::styleForFile() const
-{
-    return ClangFormat::styleForFile(m_fileName);
-}
-
 bool ClangFormatIndenter::formatCodeInsteadOfIndent() const
 {
     return ClangFormatSettings::instance().formatCodeInsteadOfIndent();

src/plugins/clangformat/clangformatindenter.h

@@ -41,7 +41,6 @@ public:
 private:
     bool formatCodeInsteadOfIndent() const override;
     bool formatWhileTyping() const override;
-    clang::format::FormatStyle styleForFile() const override;
     int lastSaveRevision() const override;
 };
 

src/plugins/clangformat/clangformatutils.cpp

@@ -30,7 +30,9 @@
 
 #include <coreplugin/icore.h>
 #include <cppeditor/cppcodestylesettings.h>
+#include <texteditor/icodestylepreferences.h>
 #include <texteditor/tabsettings.h>
+#include <texteditor/texteditorsettings.h>
 #include <projectexplorer/project.h>
 #include <projectexplorer/session.h>
 #include <utils/qtcassert.h>
@@ -208,6 +210,7 @@ void saveStyleToFile(clang::format::FormatStyle style, Utils::FilePath filePath)
     const int pos = styleStr.find("# BasedOnStyle");
     if (pos != int(std::string::npos))
         styleStr.erase(pos, 2);
+    styleStr.append("\n");
     filePath.writeFileContents(QByteArray::fromStdString(styleStr));
 }
 
@@ -382,6 +385,13 @@ void addQtcStatementMacros(clang::format::FormatStyle &style)
     }
 }
 
+Utils::FilePath filePathToCurrentSettings(const TextEditor::ICodeStylePreferences *codeStyle)
+{
+    return Core::ICore::userResourcePath() / "clang-format/"
+           / Utils::FileUtils::fileSystemFriendlyName(codeStyle->displayName())
+           / QLatin1String(Constants::SETTINGS_FILE_NAME);
+}
+
 std::string readFile(const QString &path)
 {
     const std::string defaultStyle = clang::format::configurationAsText(qtcStyle());

src/plugins/clangformat/clangformatutils.h

@@ -34,6 +34,7 @@
 
 #include <fstream>
 
+namespace TextEditor { class ICodeStylePreferences; }
 namespace ClangFormat {
 
 // Creates the style for the current project or the global style if needed.
@@ -55,4 +56,6 @@ void saveStyleToFile(clang::format::FormatStyle style, Utils::FilePath filePath)
 
 void addQtcStatementMacros(clang::format::FormatStyle &style);
 clang::format::FormatStyle qtcStyle();
+
+Utils::FilePath filePathToCurrentSettings(const TextEditor::ICodeStylePreferences *codeStyle);
 }

src/plugins/clangformat/tests/clangformat-test.cpp

@@ -52,7 +52,7 @@ public:
     ClangFormatExtendedTestIndenter(QTextDocument *doc) : ClangFormatTestIndenter(doc) {}
 
 private:
-    bool formatWhileTyping() const override { return true; }
+    bool formatCodeInsteadOfIndent() const override { return true; }
 };
 
 ClangFormatTest::ClangFormatTest()