Add option to configure file line ending for an open document

Add into the text editor toolbar a combo box which allows to change
the line endings for an open document.
The supported line endings are LF and CRLF.

Change-Id: I029ba7867e0087b162edba7aba1bd1d1e966fd69
Reviewed-by: Leena Miettinen <riitta-leena.miettinen@qt.io>
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: Eike Ziller <eike.ziller@qt.io>

src/plugins/coreplugin/textdocument.cpp

@@ -101,6 +101,11 @@ void BaseTextDocument::setSupportsUtf8Bom(bool value)
     d->m_supportsUtf8Bom = value;
 }
 
+void BaseTextDocument::setLineTerminationMode(Utils::TextFileFormat::LineTerminationMode mode)
+{
+    d->m_format.lineTerminationMode = mode;
+}
+
 /*!
     Autodetects format and reads in the text file specified by \a fileName.
 */
@@ -149,6 +154,11 @@ bool BaseTextDocument::supportsUtf8Bom() const
     return d->m_supportsUtf8Bom;
 }
 
+Utils::TextFileFormat::LineTerminationMode BaseTextDocument::lineTerminationMode() const
+{
+    return d->m_format.lineTerminationMode;
+}
+
 /*!
     Returns the format obtained from the last call to \c read().
 */

src/plugins/coreplugin/textdocument.h

@@ -48,6 +48,7 @@ public:
     void setCodec(const QTextCodec *);
     void switchUtf8Bom();
     bool supportsUtf8Bom() const;
+    Utils::TextFileFormat::LineTerminationMode lineTerminationMode() const;
 
     ReadResult read(const QString &fileName, QStringList *plainTextList, QString *errorString);
     ReadResult read(const QString &fileName, QString *plainText, QString *errorString);
@@ -59,6 +60,7 @@ public:
     bool write(const QString &fileName, const Utils::TextFileFormat &format, const QString &data, QString *errorMessage) const;
 
     void setSupportsUtf8Bom(bool value);
+    void setLineTerminationMode(Utils::TextFileFormat::LineTerminationMode mode);
 
 private:
     Internal::TextDocumentPrivate *d;

src/plugins/texteditor/extraencodingsettings.cpp

@@ -24,6 +24,7 @@
 ****************************************************************************/
 
 #include "extraencodingsettings.h"
+#include "behaviorsettingswidget.h"
 
 #include <utils/settingsutils.h>
 
@@ -71,3 +72,9 @@ bool ExtraEncodingSettings::equals(const ExtraEncodingSettings &s) const
 {
     return m_utf8BomSetting == s.m_utf8BomSetting;
 }
+
+QStringList ExtraEncodingSettings::lineTerminationModeNames()
+{
+    return {BehaviorSettingsWidget::tr("Unix (LF)"),
+                BehaviorSettingsWidget::tr("Windows (CRLF)")};
+}

src/plugins/texteditor/extraencodingsettings.h

@@ -49,6 +49,8 @@ public:
 
     bool equals(const ExtraEncodingSettings &s) const;
 
+    static QStringList lineTerminationModeNames();
+
     enum Utf8BomSetting {
         AlwaysAdd = 0,
         OnlyKeep = 1,

src/plugins/texteditor/texteditor.cpp

@@ -90,6 +90,7 @@
 #include <QApplication>
 #include <QClipboard>
 #include <QCoreApplication>
+#include <QComboBox>
 #include <QDebug>
 #include <QFutureWatcher>
 #include <QGridLayout>
@@ -624,6 +625,9 @@ public:
     FixedSizeClickLabel *m_fileEncodingLabel = nullptr;
     QAction *m_fileEncodingLabelAction = nullptr;
 
+    QComboBox *m_fileLineEnding = nullptr;
+    QAction *m_fileLineEndingAction = nullptr;
+
     bool m_contentsChanged = false;
     bool m_lastCursorChangeWasInteresting = false;
 
@@ -825,6 +829,11 @@ TextEditorWidgetPrivate::TextEditorWidgetPrivate(TextEditorWidget *parent)
     m_cursorPositionLabel->setContentsMargins(spacing, 0, spacing, 0);
     m_toolBarWidget->layout()->addWidget(m_cursorPositionLabel);
 
+    m_fileLineEnding = new QComboBox();
+    m_fileLineEnding->addItems(ExtraEncodingSettings::lineTerminationModeNames());
+    m_fileLineEnding->setContentsMargins(spacing, 0, spacing, 0);
+    m_fileLineEndingAction = m_toolBar->addWidget(m_fileLineEnding);
+
     m_fileEncodingLabel = new FixedSizeClickLabel;
     m_fileEncodingLabel->setContentsMargins(spacing, 0, spacing, 0);
     m_fileEncodingLabelAction = m_toolBar->addWidget(m_fileEncodingLabel);
@@ -1063,6 +1072,13 @@ void TextEditorWidgetPrivate::ctor(const QSharedPointer<TextDocument> &doc)
     connect(m_document->document(), &QTextDocument::modificationChanged,
             q, &TextEditorWidget::updateTextCodecLabel);
     q->updateTextCodecLabel();
+
+    connect(m_fileLineEnding, QOverload<int>::of(&QComboBox::currentIndexChanged),
+            q, &TextEditorWidget::selectLineEnding);
+    connect(m_document->document(), &QTextDocument::modificationChanged,
+            q, &TextEditorWidget::updateTextLineEndingLabel);
+    q->updateTextLineEndingLabel();
+
 }
 
 TextEditorWidget::~TextEditorWidget()
@@ -1318,6 +1334,21 @@ void TextEditorWidget::selectEncoding()
     }
 }
 
+void TextEditorWidget::selectLineEnding(int index)
+{
+    QTC_CHECK(index >= 0);
+    const auto newMode = Utils::TextFileFormat::LineTerminationMode(index);
+    if (d->m_document->lineTerminationMode() != newMode) {
+        d->m_document->setLineTerminationMode(newMode);
+        d->q->document()->setModified(true);
+    }
+}
+
+void TextEditorWidget::updateTextLineEndingLabel()
+{
+    d->m_fileLineEnding->setCurrentIndex(d->m_document->lineTerminationMode());
+}
+
 void TextEditorWidget::updateTextCodecLabel()
 {
     QString text = QString::fromLatin1(d->m_document->codec()->name());

src/plugins/texteditor/texteditor.h

@@ -381,6 +381,8 @@ public:
     void unfold();
     void selectEncoding();
     void updateTextCodecLabel();
+    void selectLineEnding(int index);
+    void updateTextLineEndingLabel();
 
     void gotoBlockStart();
     void gotoBlockEnd();