FakeVim: Option 'passnewline' (not in Vim)

Option 'passnewline' ('pnl') passes new line in insert mode and on 'o'
and 'O' commands to editor widget. This way the editor widget can handle
the indentation or insert characters (e.g. asterisk if in C block
comment).

Change-Id: I06afab6b20b49e1b4d31447826c847d36d32806f
Reviewed-by: hjk <hjk121@nokiamail.com>

src/plugins/fakevim/fakevimhandler.cpp

@@ -1396,6 +1396,7 @@ public:
     void handleExCommand(const QString &cmd);
 
     void installEventFilter();
+    void removeEventFilter();
     void passShortcuts(bool enable);
     void setupWidget();
     void restoreWidget(int tabSize);
@@ -1728,6 +1729,8 @@ public:
 
     void joinLines(int count, bool preserveSpace = false);
 
+    void insertNewLine();
+
     // undo handling
     int revision() const { return document()->availableUndoSteps(); }
     void undoRedo(bool undo);
@@ -2098,6 +2101,12 @@ void FakeVimHandler::Private::installEventFilter()
     EDITOR(installEventFilter(q));
 }
 
+void FakeVimHandler::Private::removeEventFilter()
+{
+    EDITOR(viewport()->removeEventFilter(q));
+    EDITOR(removeEventFilter(q));
+}
+
 void FakeVimHandler::Private::setupWidget()
 {
     m_mode = CommandMode;
@@ -3661,26 +3670,38 @@ bool FakeVimHandler::Private::handleNoSubMode(const Input &input)
         bool insertAfter = input.is('o');
         setDotCommand(_(insertAfter ? "%1o" : "%1O"), count());
         setUndoPosition();
-        enterInsertMode();
-        // Insert new line so that command can be repeated [count] times inserting new line
-        // each time without unfolding any lines.
-        QTextBlock block = cursor().block();
-        bool appendLine = false;
-        if (insertAfter) {
-            const int line = lineNumber(block);
-            appendLine = line >= document()->lineCount();
-            setPosition(appendLine ? lastPositionInLine(line) : firstPositionInLine(line + 1));
-        } else {
-            setPosition(block.position());
+
+        // Prepend line only if on the first line and command is 'O'.
+        bool appendLine = true;
+        if (!insertAfter) {
+            if (block().blockNumber() == 0)
+                appendLine = false;
+            else
+                moveUp();
         }
+        const int line = lineNumber(block());
+
+        enterInsertMode();
         beginEditBlock();
-        insertText(QString::fromLatin1("\n"));
-        if (!appendLine)
+        if (appendLine) {
+            setPosition(lastPositionInLine(line));
+            insertNewLine();
+        } else {
+            setPosition(firstPositionInLine(line));
+            insertNewLine();
             moveUp();
-        insertAutomaticIndentation(insertAfter);
+        }
         recordInsertion(QString::fromLatin1("\n"));
         setTargetColumn();
         endEditBlock();
+
+        // Close accidentally opened block.
+        if (block().blockNumber() > 0) {
+            moveUp();
+            if (line != lineNumber(block()))
+                emit q->fold(1, true);
+            moveDown();
+        }
     } else if (input.isControl('o')) {
         jump(-count());
     } else if (input.is('p') || input.is('P') || input.isShift(Qt::Key_Insert)) {
@@ -4266,9 +4287,8 @@ EventResult FakeVimHandler::Private::handleInsertMode(const Input &input)
     } else if (input.isReturn() || input.isControl('j') || input.isControl('m')) {
         joinPreviousEditBlock();
         m_submode = NoSubMode;
-        insertText(QString::fromLatin1("\n"));
+        insertNewLine();
         insert = _("\n");
-        insertAutomaticIndentation(true);
         endEditBlock();
     } else if (input.isBackspace()) {
         joinPreviousEditBlock();
@@ -6456,6 +6476,30 @@ void FakeVimHandler::Private::joinLines(int count, bool preserveSpace)
     setPosition(pos);
 }
 
+void FakeVimHandler::Private::insertNewLine()
+{
+    if ( hasConfig(ConfigPassNewLine) ) {
+        QKeyEvent event(QEvent::KeyPress, Qt::Key_Return, Qt::NoModifier, QLatin1String("\n"));
+
+        removeEventFilter();
+
+        QTextCursor tc = m_cursor;
+        tc.setPosition(tc.position());
+        EDITOR(setTextCursor(tc));
+        bool accepted = QApplication::sendEvent(editor(), &event);
+
+        installEventFilter();
+
+        if (accepted) {
+            setPosition(EDITOR(textCursor()).position());
+            return;
+        }
+    }
+
+    insertText(QString::fromLatin1("\n"));
+    insertAutomaticIndentation(true);
+}
+
 QString FakeVimHandler::Private::lineContents(int line) const
 {
     return document()->findBlockByLineNumber(line - 1).text();