Add semantic integration copy actions

- Selecting Copy (or pressing ctrl-shift-c) when there is no selection
  selects current output if current mode is output, current input if
  current mode is input and input is non-empty, and last output if current
  input is empty.
- Ctrl + mouse triple click selects the pointed input/output/prompt.
- There is also a fix that was missed in previous patch for keeping
  track of current semantic mode through scrolls.

src/Screen.cpp

@@ -75,6 +75,7 @@ Screen::Screen(int lines, int columns)
     , _bottomMargin(0)
     , _replMode(REPL_None)
     , _hasRepl(false)
+    , _replLastOutputStart(std::pair(-1, -1))
     , _tabStops(QBitArray())
     , _selBegin(0)
     , _selTopLeft(0)
@@ -1142,6 +1143,14 @@ void Screen::scrollUp(int from, int n)
     if (_hasGraphics) {
         scrollPlacements(n);
     }
+    if (_replMode != REPL_None) {
+        _replModeStart = std::make_pair(_replModeStart.first - 1, _replModeStart.second);
+        _replModeEnd = std::make_pair(_replModeEnd.first - 1, _replModeEnd.second);
+        if (_replLastOutputStart.first > -1) {
+            _replLastOutputStart = std::make_pair(_replLastOutputStart.first - 1, _replLastOutputStart.second);
+            _replLastOutputEnd = std::make_pair(_replLastOutputEnd.first - 1, _replLastOutputEnd.second);
+        }
+    }
 }
 
 void Screen::scrollDown(int n)
@@ -1569,9 +1578,120 @@ bool Screen::isSelected(const int x, const int y) const
     return pos >= _selTopLeft && pos <= _selBottomRight && columnInSelection;
 }
 
+Character Screen::getCharacter(int col, int row) const
+{
+    Character ch;
+    if (row >= _history->getLines()) {
+        ch = _screenLines[row - _history->getLines()].value(col);
+    } else {
+        if (col < _history->getLineLen(row)) {
+            _history->getCells(row, col, 1, &ch);
+        } else {
+            ch = Character();
+        }
+    }
+    return ch;
+}
+
+void Screen::selectReplContigious(const int x, const int y)
+{
+    // Avoid searching if in current input
+    if (_replMode == REPL_INPUT && _replModeStart <= std::pair(y, x) && std::pair(y, x) <= _replModeEnd) {
+        setSelectionStart(_replModeStart.second, _replModeStart.first, false);
+        setSelectionEnd(_replModeEnd.second, _replModeEnd.first, true);
+        Q_EMIT _currentTerminalDisplay->screenWindow()->selectionChanged();
+        return;
+    }
+    int col = x;
+    int row = y;
+    if (row < _history->getLines()) {
+        col = std::min(col, _history->getLineLen(row) - 1);
+    } else {
+        col = std::min(col, _screenLines[row - _history->getLines()].size() - 1);
+    }
+    while (col > 0 && (getCharacter(col, row).flags & EF_REPL) == EF_REPL_NONE) {
+        col--;
+    }
+    if ((getCharacter(col, row).flags & EF_REPL) == EF_REPL_NONE) {
+        return;
+    }
+    int mode = getCharacter(col, row).flags & EF_REPL;
+    int startX = x;
+    int startY = y;
+    int lastX = x;
+    int lastY = y;
+    bool stop = false;
+    while (true) {
+        while (startX >= 0) {
+            // mode or NONE continue search, but ignore last run of NONEs
+            if (getCharacter(startX, startY).repl() == mode) {
+                lastX = startX;
+                lastY = startY;
+            }
+            if (getCharacter(startX, startY).repl() != mode && getCharacter(startX, startY).repl() != EF_REPL_NONE) {
+                stop = true;
+                startX = lastX;
+                startY = lastY;
+                break;
+            }
+            startX--;
+        }
+        if (stop) {
+            break;
+        }
+        startY--;
+        if (startY < 0) {
+            startY = 0;
+            startX = 0;
+            break;
+        }
+        startX = getLineLength(startY) - 1;
+    }
+    int endX = x;
+    int endY = y;
+    stop = false;
+    while (endY < _lines + _history->getLines()) {
+        while (endX < getLineLength(endY)) {
+            if (getCharacter(endX, endY).repl() != mode && getCharacter(endX, endY).repl() != EF_REPL_NONE) {
+                stop = true;
+                break;
+            }
+            endX++;
+        }
+        if (stop) {
+            break;
+        }
+        endX = 0;
+        endY++;
+    }
+    if (endX == 0) {
+        endY--;
+        endX = getLineLength(endY) - 1;
+    } else {
+        endX--;
+    }
+    setSelectionStart(startX, startY, false);
+    setSelectionEnd(endX, endY, true);
+    Q_EMIT _currentTerminalDisplay->screenWindow()->selectionChanged();
+}
+
 QString Screen::selectedText(const DecodingOptions options) const
 {
     if (!isSelectionValid()) {
+        if (!_hasRepl) {
+            return QString();
+        }
+        int currentStart = (_history->getLines() + _replModeStart.first) * _columns + _replModeStart.second;
+        int currentEnd = (_history->getLines() + _replModeEnd.first) * _columns + _replModeEnd.second - 1;
+
+        if (_replMode == REPL_INPUT && currentStart > currentEnd && _replLastOutputStart.first > -1) {
+            // If no input yet, copy last output
+            currentStart = (_history->getLines() + _replLastOutputStart.first) * _columns + _replLastOutputStart.second;
+            currentEnd = (_history->getLines() + _replLastOutputEnd.first) * _columns + _replLastOutputEnd.second - 1;
+        }
+        if (currentEnd >= currentStart) {
+            return text(currentStart, currentEnd, options);
+        }
         return QString();
     }
 
@@ -1960,12 +2080,17 @@ void Screen::setLineProperty(LineProperty property, bool enable)
 void Screen::setReplMode(int mode)
 {
     if (_replMode != mode) {
+        if (_replMode == REPL_OUTPUT) {
+            _replLastOutputStart = _replModeStart;
+            _replLastOutputEnd = _replModeEnd;
+        }
         _replMode = mode;
         _replModeStart = std::make_pair(_cuY, _cuX);
         _replModeEnd = std::make_pair(_cuY, _cuX);
     }
     if (mode != REPL_None) {
         _hasRepl = true;
+        Q_EMIT _currentTerminalDisplay->screenWindow()->selectionChanged(); // Enable copy action
         setLineProperty(LINE_PROMPT_START << (mode - REPL_PROMPT), true);
     }
 }

src/Screen.h

@@ -464,6 +464,11 @@ public:
      */
     void setSelectionEnd(const int x, const int y, const bool trimTrailingWhitespace);
 
+    /**
+     * Selects a range of characters with the same REPL mode as the character at (@p x, @p y)
+     */
+    void selectReplContigious(const int x, const int y);
+
     /**
      * Retrieves the start of the selection or the cursor position if there
      * is no selection.
@@ -743,6 +748,8 @@ private:
     // starting from 'startLine', where 0 is the first line in the history
     void copyFromHistory(Character *dest, int startLine, int count) const;
 
+    Character getCharacter(int col, int row) const;
+
     // returns a buffer that can hold at most 'count' characters,
     // where the number of reallocations and object reinitializations
     // should be as minimal as possible
@@ -806,6 +813,8 @@ private:
     bool _hasRepl;
     std::pair<int, int> _replModeStart;
     std::pair<int, int> _replModeEnd;
+    std::pair<int, int> _replLastOutputStart;
+    std::pair<int, int> _replLastOutputEnd;
 
     // ----------------------------
 

src/characters/Character.h

@@ -56,6 +56,7 @@ const RenditionFlags RE_TRANSPARENT        = (1 << 12);
 const ExtraFlags EF_UNREAL       = 0;
 const ExtraFlags EF_REAL         = (1 << 0);
 const ExtraFlags EF_REPL         = (3 << 1);
+const ExtraFlags EF_REPL_NONE    = (0 << 1);
 const ExtraFlags EF_REPL_PROMPT  = (1 << 1);
 const ExtraFlags EF_REPL_INPUT   = (2 << 1);
 const ExtraFlags EF_REPL_OUTPUT  = (3 << 1);
@@ -155,6 +156,11 @@ public:
         return width(character);
     }
 
+    int repl() const
+    {
+        return flags & EF_REPL;
+    }
+
     static int width(uint ucs4)
     {
         // ASCII

src/session/SessionController.cpp

@@ -455,10 +455,11 @@ void SessionController::updateCopyAction(const bool selectionEmpty)
     QAction *copyAction = actionCollection()->action(QStringLiteral("edit_copy"));
     QAction *copyContextMenu = actionCollection()->action(QStringLiteral("edit_copy_contextmenu"));
     // copy action is meaningful only when some text is selected.
-    copyAction->setEnabled(!selectionEmpty);
-    copyContextMenu->setVisible(!selectionEmpty);
-    QAction *Action = actionCollection()->action(QStringLiteral("edit_copy_contextmenu_in"));
+    // Or when semantic integration is used.
     bool hasRepl = view() && view()->screenWindow() && view()->screenWindow()->screen() && view()->screenWindow()->screen()->hasRepl();
+    copyAction->setEnabled(!selectionEmpty || hasRepl);
+    copyContextMenu->setVisible(!selectionEmpty || hasRepl);
+    QAction *Action = actionCollection()->action(QStringLiteral("edit_copy_contextmenu_in"));
     Action->setVisible(!selectionEmpty && hasRepl);
     Action = actionCollection()->action(QStringLiteral("edit_copy_contextmenu_out"));
     Action->setVisible(!selectionEmpty && hasRepl);

src/terminalDisplay/TerminalDisplay.cpp

@@ -1916,7 +1916,12 @@ void TerminalDisplay::mouseTripleClickEvent(QMouseEvent *ev)
     }
 
     auto [charLine, charColumn] = getCharacterPosition(ev->pos(), true);
-    selectLine(QPoint(charColumn, charLine), _tripleClickMode == Enum::SelectWholeLine);
+    if (_screenWindow->screen()->hasRepl() && ev->modifiers() & Qt::ControlModifier) {
+        _screenWindow->screen()->selectReplContigious(charColumn, charLine + _screenWindow->currentLine());
+        copyToX11Selection();
+    } else {
+        selectLine(QPoint(charColumn, charLine), _tripleClickMode == Enum::SelectWholeLine);
+    }
 }
 
 void TerminalDisplay::selectLine(QPoint pos, bool entireLine)