Beautifier: Support formatting specific lines of file with Uncrustify

It's now possible to format only a specific range of the current file.
The used tool, however, needs to support the formatting of fragments
like Uncrustify does with --frag.

Change-Id: I486a350b6301e4a087619b1e225f2a5c553ff7df
Reviewed-by: Jochen Becher <jochen_becher@gmx.de>
Reviewed-by: David Schulz <david.schulz@theqtcompany.com>

src/plugins/beautifier/beautifierplugin.cpp

@@ -46,11 +46,13 @@
 #include <coreplugin/icore.h>
 #include <coreplugin/messagemanager.h>
 #include <diffeditor/differ.h>
+#include <texteditor/convenience.h>
 #include <texteditor/textdocument.h>
 #include <texteditor/textdocumentlayout.h>
 #include <texteditor/texteditor.h>
 #include <texteditor/texteditorconstants.h>
 #include <utils/fileutils.h>
+#include <utils/qtcassert.h>
 #include <utils/QtConcurrentTools>
 
 #include <QAction>
@@ -219,24 +221,28 @@ QString BeautifierPlugin::format(const QString &text, const Command &command,
     return QString();
 }
 
-void BeautifierPlugin::formatCurrentFile(const Command &command)
+void BeautifierPlugin::formatCurrentFile(const Command &command, int startPos, int endPos)
 {
-    TextEditorWidget *widget = TextEditorWidget::currentTextEditorWidget();
-    if (!widget)
-        return;
+    QTC_ASSERT(startPos <= endPos, return);
 
-    const QString sourceData = widget->toPlainText();
-    if (sourceData.isEmpty())
-        return;
+    if (TextEditorWidget *widget = TextEditorWidget::currentTextEditorWidget()) {
+        if (const TextDocument *doc = widget->textDocument()) {
+            const QString sourceData = (startPos < 0)
+                    ? widget->toPlainText()
+                    : Convenience::textAt(widget->textCursor(), startPos, (endPos - startPos));
+            if (sourceData.isEmpty())
+                return;
+            const FormatTask task = FormatTask(widget, doc->filePath().toString(), sourceData,
+                                               command, startPos, endPos);
 
-    QFutureWatcher<FormatTask> *watcher = new QFutureWatcher<FormatTask>;
-    connect(widget->textDocument(), &TextDocument::contentsChanged,
-            watcher, &QFutureWatcher<FormatTask>::cancel);
-    connect(watcher, SIGNAL(finished()), m_asyncFormatMapper, SLOT(map()));
-    m_asyncFormatMapper->setMapping(watcher, watcher);
-    const QString filePath = widget->textDocument()->filePath().toString();
-    watcher->setFuture(QtConcurrent::run(&BeautifierPlugin::formatAsync, this,
-                                         FormatTask(widget, filePath, sourceData, command)));
+            QFutureWatcher<FormatTask> *watcher = new QFutureWatcher<FormatTask>;
+            connect(doc, &TextDocument::contentsChanged,
+                    watcher, &QFutureWatcher<FormatTask>::cancel);
+            connect(watcher, SIGNAL(finished()), m_asyncFormatMapper, SLOT(map()));
+            m_asyncFormatMapper->setMapping(watcher, watcher);
+            watcher->setFuture(QtConcurrent::run(&BeautifierPlugin::formatAsync, this, task));
+        }
+    }
 }
 
 void BeautifierPlugin::formatAsync(QFutureInterface<FormatTask> &future, FormatTask task)
@@ -268,6 +274,11 @@ void BeautifierPlugin::formatCurrentFileContinue(QObject *watcher)
         return;
     }
 
+    if (task.formattedData.isEmpty()) {
+        showError(tr("Could not format file %1.").arg(task.filePath));
+        return;
+    }
+
     QPlainTextEdit *textEditor = task.editor;
     if (!textEditor) {
         showError(tr("File %1 was closed.").arg(task.filePath));
@@ -275,10 +286,14 @@ void BeautifierPlugin::formatCurrentFileContinue(QObject *watcher)
     }
 
     const QString sourceData = textEditor->toPlainText();
-    const QString formattedData = task.formattedData;
-    if ((sourceData == formattedData) || formattedData.isEmpty())
+    const QString formattedData = (task.startPos < 0)
+            ? task.formattedData
+            : QString(sourceData).replace(task.startPos, (task.endPos - task.startPos),
+                                          task.formattedData);
+    if (sourceData == formattedData)
         return;
 
+
     // Since QTextCursor does not work properly with folded blocks, all blocks must be unfolded.
     // To restore the current state at the end, keep track of which block is folded.
     QList<int> foldedBlocks;

src/plugins/beautifier/beautifierplugin.h

@@ -50,19 +50,23 @@ class BeautifierAbstractTool;
 struct FormatTask
 {
     FormatTask(QPlainTextEdit *_editor, const QString &_filePath, const QString &_sourceData,
-               const Command &_command) :
+               const Command &_command, int _startPos = -1, int _endPos = 0) :
         editor(_editor),
         filePath(_filePath),
         sourceData(_sourceData),
         command(_command),
+        startPos(_startPos),
+        endPos(_endPos),
         timeout(false) {}
 
     QPointer<QPlainTextEdit> editor;
     QString filePath;
     QString sourceData;
     Command command;
-    QString formattedData;
+    int startPos;
+    int endPos;
     bool timeout;
+    QString formattedData;
 };
 
 class BeautifierPlugin : public ExtensionSystem::IPlugin
@@ -79,7 +83,7 @@ public:
 
     QString format(const QString &text, const Command &command, const QString &fileName,
                    bool *timeout = 0);
-    void formatCurrentFile(const Command &command);
+    void formatCurrentFile(const Command &command, int startPos = -1, int endPos = 0);
     void formatAsync(QFutureInterface<FormatTask> &future, FormatTask task);
 
     static QString msgCannotGetConfigurationFile(const QString &command);

src/plugins/beautifier/uncrustify/uncrustify.cpp

@@ -38,7 +38,6 @@
 
 #include "../beautifierconstants.h"
 #include "../beautifierplugin.h"
-#include "../command.h"
 
 #include <coreplugin/actionmanager/actioncontainer.h>
 #include <coreplugin/actionmanager/actionmanager.h>
@@ -51,6 +50,7 @@
 #include <cppeditor/cppeditorconstants.h>
 #include <projectexplorer/projecttree.h>
 #include <projectexplorer/project.h>
+#include <texteditor/texteditor.h>
 #include <utils/fileutils.h>
 
 #include <QAction>
@@ -63,6 +63,8 @@ namespace Uncrustify {
 Uncrustify::Uncrustify(BeautifierPlugin *parent) :
     BeautifierAbstractTool(parent),
     m_beautifierPlugin(parent),
+    m_formatFile(nullptr),
+    m_formatRange(nullptr),
     m_settings(new UncrustifySettings)
 {
 }
@@ -84,6 +86,12 @@ bool Uncrustify::initialize()
     menu->addAction(cmd);
     connect(m_formatFile, &QAction::triggered, this, &Uncrustify::formatFile);
 
+    m_formatRange = new QAction(BeautifierPlugin::msgFormatSelectedText(), this);
+    cmd = Core::ActionManager::registerAction(m_formatRange,
+                                              Constants::Uncrustify::ACTION_FORMATSELECTED);
+    menu->addAction(cmd);
+    connect(m_formatRange, &QAction::triggered, this, &Uncrustify::formatSelectedText);
+
     Core::ActionManager::actionContainer(Constants::MENU_ID)->addMenu(menu);
 
     return true;
@@ -91,7 +99,9 @@ bool Uncrustify::initialize()
 
 void Uncrustify::updateActions(Core::IEditor *editor)
 {
-    m_formatFile->setEnabled(editor && editor->document()->id() == CppEditor::Constants::CPPEDITOR_ID);
+    const bool enabled = (editor && editor->document()->id() == CppEditor::Constants::CPPEDITOR_ID);
+    m_formatFile->setEnabled(enabled);
+    m_formatRange->setEnabled(enabled);
 }
 
 QList<QObject *> Uncrustify::autoReleaseObjects()
@@ -111,6 +121,32 @@ void Uncrustify::formatFile()
     }
 }
 
+void Uncrustify::formatSelectedText()
+{
+    const QString cfgFileName = configurationFile();
+    if (cfgFileName.isEmpty()) {
+        BeautifierPlugin::showError(BeautifierPlugin::msgCannotGetConfigurationFile(
+                                        QLatin1String(Constants::Uncrustify::DISPLAY_NAME)));
+        return;
+    }
+
+    TextEditor::TextEditorWidget *widget = TextEditor::TextEditorWidget::currentTextEditorWidget();
+    if (!widget)
+        return;
+
+    QTextCursor tc = widget->textCursor();
+    if (tc.hasSelection()) {
+        // Extend selection to full lines
+        const int posSelectionEnd = tc.selectionEnd();
+        tc.movePosition(QTextCursor::StartOfLine);
+        const int startPos = tc.position();
+        tc.setPosition(posSelectionEnd);
+        tc.movePosition(QTextCursor::EndOfLine);
+        const int endPos = tc.position();
+        m_beautifierPlugin->formatCurrentFile(command(cfgFileName, true), startPos, endPos);
+    }
+}
+
 QString Uncrustify::configurationFile() const
 {
     if (m_settings->useCustomStyle())
@@ -140,7 +176,7 @@ QString Uncrustify::configurationFile() const
     return QString();
 }
 
-Command Uncrustify::command(const QString &cfgFile) const
+Command Uncrustify::command(const QString &cfgFile, bool fragment) const
 {
     Command command;
     command.setExecutable(m_settings->command());
@@ -149,6 +185,8 @@ Command Uncrustify::command(const QString &cfgFile) const
     command.addOption(QLatin1String("cpp"));
     command.addOption(QLatin1String("-L"));
     command.addOption(QLatin1String("1-2"));
+    if (fragment)
+        command.addOption(QLatin1String("--frag"));
     command.addOption(QLatin1String("-c"));
     command.addOption(cfgFile);
     return command;

src/plugins/beautifier/uncrustify/uncrustify.h

@@ -58,13 +58,15 @@ public:
 
 private slots:
     void formatFile();
+    void formatSelectedText();
 
 private:
     BeautifierPlugin *m_beautifierPlugin;
     QAction *m_formatFile;
+    QAction *m_formatRange;
     UncrustifySettings *m_settings;
     QString configurationFile() const;
-    Command command(const QString &cfgFile) const;
+    Command command(const QString &cfgFile, bool fragment = false) const;
 };
 
 } // namespace Uncrustify

src/plugins/beautifier/uncrustify/uncrustifyconstants.h

@@ -37,6 +37,7 @@ namespace Uncrustify {
 
 const char DISPLAY_NAME[]          = "Uncrustify";
 const char ACTION_FORMATFILE[]     = "Uncrustify.FormatFile";
+const char ACTION_FORMATSELECTED[] = "Uncrustify.FormatSelectedText";
 const char MENU_ID[]               = "Uncrustify.Menu";
 const char OPTION_ID[]             = "Uncrustify";
 const char SETTINGS_NAME[]         = "uncrustify";