Add an action to format code using clang-format by lines

When the file contians non-ascii characters, the position calculated by
QTextBlock may not the same as clang-format. Format at Cursor will not
work in this case, formatting by lines as a workaround.

Fixes: QTCREATORBUG-21812
Change-Id: I4906130111ef2a2f15ffa698a14bec9430cbb3d5
Reviewed-by: Christian Kandeler <christian.kandeler@qt.io>

src/plugins/beautifier/beautifierplugin.cpp

@@ -218,6 +218,12 @@ QString BeautifierPlugin::msgFormatAtCursor()
     return tr("&Format at Cursor");
 }
 
+QString BeautifierPlugin::msgFormatLines()
+{
+    //: Menu entry
+    return tr("Format &Line(s)");
+}
+
 QString BeautifierPlugin::msgDisableFormattingSelectedText()
 {
     //: Menu entry

src/plugins/beautifier/beautifierplugin.h

@@ -41,6 +41,7 @@ public:
     static QString msgFormatCurrentFile();
     static QString msgFormatSelectedText();
     static QString msgFormatAtCursor();
+    static QString msgFormatLines();
     static QString msgDisableFormattingSelectedText();
     static QString msgCommandPromptDialogTitle(const QString &command);
     static void showError(const QString &error);

src/plugins/beautifier/clangformat/clangformat.cpp

@@ -65,6 +65,11 @@ ClangFormat::ClangFormat()
     menu->addAction(cmd);
     connect(m_formatFile, &QAction::triggered, this, &ClangFormat::formatFile);
 
+    m_formatLines = new QAction(BeautifierPlugin::msgFormatLines(), this);
+    cmd = Core::ActionManager::registerAction(m_formatLines, "ClangFormat.FormatLines");
+    menu->addAction(cmd);
+    connect(m_formatLines, &QAction::triggered, this, &ClangFormat::formatLines);
+
     m_formatRange = new QAction(BeautifierPlugin::msgFormatAtCursor(), this);
     cmd = Core::ActionManager::registerAction(m_formatRange, "ClangFormat.FormatAtCursor");
     menu->addAction(cmd);
@@ -123,6 +128,31 @@ void ClangFormat::formatAtCursor()
     }
 }
 
+void ClangFormat::formatLines()
+{
+    const TextEditorWidget *widget = TextEditorWidget::currentTextEditorWidget();
+    if (!widget)
+        return;
+
+    const QTextCursor tc = widget->textCursor();
+    // Current line by default
+    int lineStart = tc.blockNumber() + 1;
+    int lineEnd = lineStart;
+
+    // Note that clang-format will extend the range to the next bigger
+    // syntactic construct if needed.
+    if (tc.hasSelection()) {
+        const QTextBlock start = tc.document()->findBlock(tc.selectionStart());
+        const QTextBlock end = tc.document()->findBlock(tc.selectionEnd());
+        lineStart = start.blockNumber() + 1;
+        lineEnd = end.blockNumber() + 1;
+    }
+
+    auto cmd = command();
+    cmd.addOption(QString("-lines=%1:%2").arg(QString::number(lineStart)).arg(QString::number(lineEnd)));
+    formatCurrentFile(cmd);
+}
+
 void ClangFormat::disableFormattingSelectedText()
 {
     TextEditorWidget *widget = TextEditorWidget::currentTextEditorWidget();

src/plugins/beautifier/clangformat/clangformat.h

@@ -48,10 +48,12 @@ public:
 private:
     void formatFile();
     void formatAtCursor();
+    void formatLines();
     void disableFormattingSelectedText();
     TextEditor::Command command(int offset, int length) const;
 
     QAction *m_formatFile = nullptr;
+    QAction *m_formatLines = nullptr;
     QAction *m_formatRange = nullptr;
     QAction *m_disableFormattingSelectedText = nullptr;
     ClangFormatSettings m_settings;