CTK/Libs/Widgets/ctkConsole.cpp

/*=========================================================================

  Library:   CTK

  Copyright (c) Kitware Inc.

  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at

      http://www.apache.org/licenses/LICENSE-2.0.txt

  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.

=========================================================================*/
/*=========================================================================

   Program: ParaView

   Copyright (c) 2005-2008 Sandia Corporation, Kitware Inc.
   All rights reserved.

   ParaView is a free software; you can redistribute it and/or modify it
   under the terms of the ParaView license version 1.2. 

   See http://www.paraview.org/paraview/project/license.html for the full ParaView license.
   A copy of this license can be obtained by contacting
   Kitware Inc.
   28 Corporate Drive
   Clifton Park, NY 12065
   USA

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

=========================================================================*/

// Qt includes
#include <QAbstractItemView>
#include <QAction>
#include <QApplication>
#include <QClipboard>
#include <QCompleter>
#include <QFile>
#include <QFileDialog>
#include <QKeyEvent>
#include <QMimeData>
#include <QPointer>
#include <QPushButton>
#include <QTextBlock>
#include <QTextCursor>
#include <QVBoxLayout>
#include <QScrollBar>
#include <QDebug>

// CTK includes
#include "ctkConsole.h"
#include "ctkConsole_p.h"
#include "ctkPimpl.h"

//-----------------------------------------------------------------------------
// ctkConsoleCompleter methods

//-----------------------------------------------------------------------------
QStringList ctkConsoleCompleter::autocompletePreferenceList()
{
  return this->AutocompletePreferenceList;
}

//-----------------------------------------------------------------------------
void ctkConsoleCompleter::setAutocompletePreferenceList(const QStringList& list)
{
  this->AutocompletePreferenceList = list;
}

//-----------------------------------------------------------------------------
// ctkConsolePrivate methods

//-----------------------------------------------------------------------------
ctkConsolePrivate::ctkConsolePrivate(ctkConsole& object) :
  Superclass(0),
  q_ptr(&object),
  InteractivePosition(documentEnd()),
  MessageOutputSize(0),
  MultilineStatement(false), Ps1("$ "), Ps2("> "),
  EditorHints(ctkConsole::AutomaticIndentation | ctkConsole::RemoveTrailingSpaces),
  ScrollbarAtBottom(false),
  CompleterShortcuts(QList<QKeySequence>() << Qt::Key_Tab),
  RunFileOptions(ctkConsole::RunFileShortcut),
  RunFileButton(NULL),
  RunFileAction(NULL)
{
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::init()
{
  Q_Q(ctkConsole);
  this->setParent(q);
  this->setTabChangesFocus(false);
  this->setAcceptDrops(false);
  this->setAcceptRichText(false);
  this->setUndoRedoEnabled(false);

  this->PromptColor = QColor(0, 0, 0);    // Black
  this->OutputTextColor = QColor(0, 150, 0);  // Green
  this->MessageOutputColor = QColor(Qt::gray);  // Gray
  this->ErrorTextColor = QColor(255, 0, 0);   // Red
  this->StdinTextColor = QColor(Qt::darkGray);
  this->CommandTextColor = QColor(0, 0, 150); // Blue
  this->WelcomeTextColor = QColor(0, 0, 255); // Dark Blue

  QFont shellFont;
  shellFont.setFamily("Courier");
  shellFont.setStyleHint(QFont::TypeWriter);
  shellFont.setFixedPitch(true);

  QTextCharFormat format;
  format.setFont(shellFont);
  format.setForeground(this->OutputTextColor);
  this->setCurrentCharFormat(format);

  this->CommandHistory.append("");
  this->CommandPosition = 0;

  this->RunFileAction = new QAction(q->tr("&Run file"), q);
  this->RunFileAction->setShortcut(q->tr("Ctrl+r"));
  connect(this->RunFileAction, SIGNAL(triggered()), q, SLOT(runFile()));
  q->addAction(this->RunFileAction);

  QAction* printHelpAction = new QAction(q->tr("Print &help"),q);
  printHelpAction->setShortcut(q->tr("Ctrl+h"));
  connect(printHelpAction, SIGNAL(triggered()), q, SLOT(printHelp()));
  q->addAction(printHelpAction);

  this->RunFileButton = new QPushButton(q);
  this->RunFileButton->setText(q->tr("&Run script from file"));
  this->RunFileButton->setVisible(false);

  QVBoxLayout * layout = new QVBoxLayout(q);
  layout->setMargin(0);
  layout->setSpacing(0);
  layout->addWidget(this);
  layout->addWidget(this->RunFileButton);

  connect(this->verticalScrollBar(), SIGNAL(valueChanged(int)),
          SLOT(onScrollBarValueChanged(int)));
  connect(this, SIGNAL(textChanged()), SLOT(onTextChanged()));
  connect(this->RunFileButton, SIGNAL(clicked()), q, SLOT(runFile()));
  connect(this, SIGNAL(cursorPositionChanged()),
          q, SIGNAL(cursorPositionChanged()));
}

//-----------------------------------------------------------------------------
bool ctkConsolePrivate::isMoveLeftWithinLine(QKeyEvent* e, QTextCursor::MoveOperation &moveOperation, QTextCursor::MoveMode &moveMode)
{
  if (e == QKeySequence::MoveToPreviousChar)
    {
    moveOperation = QTextCursor::Left;
    moveMode = QTextCursor::MoveAnchor;
    return true;
    }
  else if (e == QKeySequence::SelectPreviousChar)
    {
    moveOperation = QTextCursor::Left;
    moveMode = QTextCursor::KeepAnchor;
    return true;
    }
  else if (e == QKeySequence::MoveToPreviousWord)
    {
    moveOperation = QTextCursor::WordLeft;
    moveMode = QTextCursor::MoveAnchor;
    return true;
    }
  else if (e == QKeySequence::SelectPreviousWord)
    {
    moveOperation = QTextCursor::WordLeft;
    moveMode = QTextCursor::KeepAnchor;
    return true;
    }
  else if (e == QKeySequence::MoveToStartOfLine)
    {
    moveOperation = QTextCursor::StartOfLine;
    moveMode = QTextCursor::MoveAnchor;
    return true;
    }
  else if (e == QKeySequence::SelectStartOfLine)
    {
    moveOperation = QTextCursor::StartOfLine;
    moveMode = QTextCursor::KeepAnchor;
    return true;
    }
  else if (e == QKeySequence::MoveToStartOfBlock)
    {
    moveOperation = QTextCursor::StartOfLine;
    moveMode = QTextCursor::MoveAnchor;
    return true;
    }
  else if (e == QKeySequence::SelectStartOfBlock)
    {
    moveOperation = QTextCursor::StartOfLine;
    moveMode = QTextCursor::KeepAnchor;
    return true;
    }
  else if (e == QKeySequence::MoveToStartOfDocument)
    {
    moveOperation = QTextCursor::StartOfLine;
    moveMode = QTextCursor::MoveAnchor;
    return true;
    }
  else if (e == QKeySequence::SelectStartOfDocument)
    {
    moveOperation = QTextCursor::StartOfLine;
    moveMode = QTextCursor::KeepAnchor;
    return true;
    }
  else
    {
    return false;
    }
}

//-----------------------------------------------------------------------------
bool ctkConsolePrivate::isMoveRighttWithinLine(QKeyEvent* e, QTextCursor::MoveOperation &moveOperation, QTextCursor::MoveMode &moveMode)
{
  if (e == QKeySequence::MoveToNextChar)
    {
    moveOperation = QTextCursor::Right;
    moveMode = QTextCursor::MoveAnchor;
    return true;
    }
  else if (e == QKeySequence::SelectNextChar)
    {
    moveOperation = QTextCursor::Right;
    moveMode = QTextCursor::KeepAnchor;
    return true;
    }
  else if (e == QKeySequence::MoveToNextWord)
    {
    moveOperation = QTextCursor::WordRight;
    moveMode = QTextCursor::MoveAnchor;
    return true;
    }
  else if (e == QKeySequence::SelectNextWord)
    {
    moveOperation = QTextCursor::WordRight;
    moveMode = QTextCursor::KeepAnchor;
    return true;
    }
  else if (e == QKeySequence::MoveToEndOfLine)
    {
    moveOperation = QTextCursor::EndOfLine;
    moveMode = QTextCursor::MoveAnchor;
    return true;
    }
  else if (e == QKeySequence::SelectEndOfLine)
    {
    moveOperation = QTextCursor::EndOfLine;
    moveMode = QTextCursor::KeepAnchor;
    return true;
    }
  else if (e == QKeySequence::MoveToEndOfBlock)
    {
    moveOperation = QTextCursor::EndOfLine;
    moveMode = QTextCursor::MoveAnchor;
    return true;
    }
  else if (e == QKeySequence::SelectEndOfBlock)
    {
    moveOperation = QTextCursor::EndOfLine;
    moveMode = QTextCursor::KeepAnchor;
    return true;
    }
  else if (e == QKeySequence::MoveToEndOfDocument)
    {
    moveOperation = QTextCursor::EndOfLine;
    moveMode = QTextCursor::MoveAnchor;
    return true;
    }
  else if (e == QKeySequence::SelectEndOfDocument)
    {
    moveOperation = QTextCursor::EndOfLine;
    moveMode = QTextCursor::KeepAnchor;
    return true;
    }
  else
    {
    return false;
    }
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::keyPressEvent(QKeyEvent* e)
{
  if (this->Completer && this->Completer->popup()->isVisible())
    {
    // The following keys are forwarded by the completer to the widget
    switch (e->key())
      {
      case Qt::Key_Enter:
      case Qt::Key_Return:
      case Qt::Key_Escape:
      case Qt::Key_Tab:
      case Qt::Key_Backtab:
        e->ignore();
        return; // let the completer do default behavior
      default:
        break;
      }
    }

  QTextCursor text_cursor = this->textCursor();

  // Set to true if there's a current selection
  const bool selection = text_cursor.anchor() != text_cursor.position();
  // Set to true if the cursor overlaps the history area
  const bool history_area = this->isCursorInHistoryArea();
  // The message output area is defined just under the command line
  // and it can display all messages catch during we autocomplete, etc.
  // Set to true if the cursor overlaps the message output area
  const bool message_output_area = this->isCursorInMessageOutputArea();

  // Allow copying anywhere in the console ...
  if(e == QKeySequence::Copy)
    {
    if(selection)
      {
      this->copy();
      }
    e->accept();
    return;
    }

  // Allow cut only if the selection is limited to the interactive area ...
  if(e == QKeySequence::Cut)
    {
    if(selection && !history_area && !message_output_area)
      {
      this->cut();
      }
    e->accept();
    return;
    }

  // Paste to the end of commandLine if in the history area or in message output area
  if(e == QKeySequence::Paste)
    {
    if(history_area || message_output_area)
      {
      text_cursor.setPosition(this->commandEnd());
      this->setTextCursor(text_cursor);
      }
    this->paste();
    e->accept();
    return;
    }

  // Allow vertical scrolling using page up/down
  if (e == QKeySequence::MoveToPreviousPage || e == QKeySequence::SelectPreviousPage
    || e == QKeySequence::MoveToNextPage || e == QKeySequence::SelectNextPage)
    {
    if (e == QKeySequence::SelectPreviousPage || e == QKeySequence::SelectNextPage)
      {
      // ignore
      e->accept();
      }
    else
      {
      this->Superclass::keyPressEvent(e);
      this->updateCommandBuffer();
      }
    return;
    }

  // Force the cursor back to the interactive area if anything else than copy/paste or page up/down is done
  // but only when a "real" key is pressed, not just a modifier (otherwise we could not press Control-c in the
  // history area because the cursor would jump to the interactive area immediately when Control is pressed)
  // Update: message_output_area is like the history_area: we can't modify it
  if( (history_area
       || message_output_area)
       && e->key() != Qt::Key_Control
       && e->key() != Qt::Key_Meta
       && e->key() != Qt::Key_Alt
       && e->key() != Qt::Key_Shift)
    {
    text_cursor.setPosition(this->commandEnd());
    this->setTextCursor(text_cursor);
    }

  // Start of line should be the start of interactive area
  QTextCursor::MoveOperation moveOperation = QTextCursor::NoMove;
  QTextCursor::MoveMode moveMode = QTextCursor::MoveAnchor;
  if(isMoveLeftWithinLine(e, moveOperation, moveMode))
    {
    text_cursor.movePosition(moveOperation, moveMode);
    if (text_cursor.position() >= this->InteractivePosition)
      {
      this->Superclass::keyPressEvent(e);
      }
    else
      {
      text_cursor.setPosition(this->InteractivePosition, moveMode);
      this->setTextCursor(text_cursor);
      e->accept();
      }
    this->updateCompleterIfVisible();
    return;
    }

  // End of line should be the end of interactive area
  moveOperation = QTextCursor::NoMove;
  moveMode = QTextCursor::MoveAnchor;
  if(isMoveRighttWithinLine(e, moveOperation, moveMode))
    {
    text_cursor.movePosition(moveOperation, moveMode);
    if (text_cursor.position() <= this->commandEnd())
      {
      this->Superclass::keyPressEvent(e);
      }
    else
      {
      text_cursor.setPosition(this->commandEnd(), moveMode);
      this->setTextCursor(text_cursor);
      e->accept();
      }
    this->updateCompleterIfVisible();
    return;
    }

  if (e == QKeySequence::Delete)
    {
    e->accept();
    // Can delete only if we are not at the end of the command line.
    // There is an exception if something is selected because it will erase the text selected instead.
    if (text_cursor.position() < this->commandEnd()
        || (text_cursor.position() <= this->commandEnd()
             && selection))
      {
      this->Superclass::keyPressEvent(e);
      this->updateCommandBuffer();
      }
    return;
    }

  // There seems to be no QKeySequence for backspace, therefore the key 
  // has to be recognized directly (the same way as it is done in the parent class)
  if (e->key() == Qt::Key_Backspace && !(e->modifiers() & ~Qt::ShiftModifier))
    {
    e->accept();
    if(text_cursor.position() > this->InteractivePosition)
      {
      this->Superclass::keyPressEvent(e);
      this->updateCommandBuffer();
      this->updateCompleterIfVisible();
      }
    return;
    }

  if (e == QKeySequence::DeleteStartOfWord)
      {
      e->accept();
      if(text_cursor.position() > this->InteractivePosition)
        {
        this->Superclass::keyPressEvent(e);
        this->updateCommandBuffer();
        this->updateCompleterIfVisible();
        }
      return;
      }

  if (e == QKeySequence::MoveToPreviousLine || e == QKeySequence::SelectPreviousLine)
    {
    e->accept();
    if (this->CommandPosition > 0)
      {
      this->replaceCommandBuffer(this->CommandHistory[--this->CommandPosition]);
      }
    return;
    }

  if (e == QKeySequence::MoveToNextLine || e == QKeySequence::SelectNextLine)
    {
    e->accept();
    if (this->CommandPosition < this->CommandHistory.size() - 2)
      {
      this->replaceCommandBuffer(this->CommandHistory[++this->CommandPosition]);
      }
    else
      {
      this->CommandPosition = this->CommandHistory.size()-1;
      this->replaceCommandBuffer("");
      }
    return;
    }

  if (e == QKeySequence::InsertParagraphSeparator)
    {
    e->accept();
    text_cursor.setPosition(this->documentEnd());
    this->setTextCursor(text_cursor);
    if (this->InputEventLoop.isNull())
      {
      this->internalExecuteCommand();
      }
    else
      {
      this->processInput();
      }
    return;
    }

  if (this->CompleterShortcuts.contains(e->key() + e->modifiers()))
    {
    e->accept();
    this->updateCompleter();
    this->selectCompletion();
    return;
    }

  e->accept();
  this->switchToUserInputTextColor();
  this->Superclass::keyPressEvent(e);
  this->updateCommandBuffer();
  this->updateCompleterIfVisible();
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::switchToUserInputTextColor(QTextCursor* textCursorToUpdate)
{
  QColor color = this->CommandTextColor;
  if (!this->InputEventLoop.isNull())
    {
    color = this->StdinTextColor;
    }
  QTextCharFormat currentFormat = this->currentCharFormat();
  // Do not trigger a finishEdit for no reason. onTextChanged() would be called.
  if (currentFormat.foreground() != color)
    {
    currentFormat.setForeground(color);
    this->setCurrentCharFormat(currentFormat);
    }

  if (textCursorToUpdate)
    {
    QTextCharFormat textCursorFormat = textCursorToUpdate->charFormat();
    if (textCursorFormat.foreground() != color)
      {
      textCursorFormat.setForeground(color);
      textCursorToUpdate->setCharFormat(textCursorFormat);
      }
    }
}

//-----------------------------------------------------------------------------
int ctkConsolePrivate::documentEnd() const
{
  QTextCursor c(this->document());
  c.movePosition(QTextCursor::End);
  return c.position();
}

//-----------------------------------------------------------------------------
int ctkConsolePrivate::commandEnd() const
{
  QTextCursor c(this->document());
  c.setPosition(this->documentEnd()-this->MessageOutputSize);
  return c.position();
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::focusOutEvent(QFocusEvent *e)
{
  this->Superclass::focusOutEvent(e);

  // For some reason the QCompleter tries to set the focus policy to
  // NoFocus, set let's make sure we set it back to the default WheelFocus.
  this->setFocusPolicy(Qt::WheelFocus);
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::resizeEvent(QResizeEvent * e)
{
  this->Superclass::resizeEvent(e);

  if (this->ScrollbarAtBottom)
    {
    this->moveCursor(QTextCursor::End);
    this->scrollToBottom();
    }
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::scrollToBottom()
{
  this->verticalScrollBar()->setValue(this->verticalScrollBar()->maximum());
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::updateCompleterIfVisible()
{
  if (this->Completer && this->Completer->popup()->isVisible())
    {
    this->updateCompleter();
    }
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::selectCompletion()
{
  if (this->Completer && this->Completer->completionCount() == 1)
    {
    this->insertCompletion(this->Completer->currentCompletion());
    this->Completer->popup()->hide();
    }
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::setCompleter(ctkConsoleCompleter* completer)
{
  if (this->Completer)
    {
    this->Completer->setWidget(0);
    disconnect(this->Completer, SIGNAL(activated(QString)),
               this, SLOT(insertCompletion(QString)));

    }
  this->Completer = completer;
  if (this->Completer)
    {
    this->Completer->setWidget(this);
    connect(this->Completer, SIGNAL(activated(QString)),
            this, SLOT(insertCompletion(QString)));
    }
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::updateCompleter()
{
  if (this->Completer)
    {
    // Get the text between the current cursor position
    // and the start of the line
    QTextCursor text_cursor = this->textCursor();
    text_cursor.setPosition(this->InteractivePosition, QTextCursor::KeepAnchor);
    QString commandText = text_cursor.selectedText();

    // Save current positions: Since some implementation of
    // updateCompletionModel (e.g python) can display messages
    // while building the completion model, it is important to save
    // and restore the positions.
    int savedInteractivePosition = this->InteractivePosition;
    int savedCursorPosition = this->textCursor().position();

    //move the cursor at the end in case of a message displayed
    QTextCursor tc = this->textCursor();
    tc.setPosition(this->documentEnd());
    this->setTextCursor(tc);
    // Save color of displayed message
    QColor savedOutputTextColor = this->OutputTextColor;
    QColor savedErrorTextColor = this->ErrorTextColor;
    // Change color of displayed message in message_output_area
    this->OutputTextColor = this->MessageOutputColor;
    this->ErrorTextColor = this->MessageOutputColor;

    // Call the completer to update the completion model
    this->Completer->updateCompletionModel(commandText);

    // Restore Color
    this->OutputTextColor = savedOutputTextColor;
    this->ErrorTextColor = savedErrorTextColor;

    // Restore positions
    this->InteractivePosition = savedInteractivePosition;
    QTextCursor textCursor = this->textCursor();
    textCursor.setPosition(savedCursorPosition);
    this->setTextCursor(textCursor);


    // Place and show the completer if there are available completions
    if (this->Completer->completionCount())
      {
      // Get a QRect for the cursor at the start of the
      // current word and then translate it down 8 pixels.
      text_cursor = this->textCursor();
      text_cursor.movePosition(QTextCursor::StartOfWord);
      QRect cr = this->cursorRect(text_cursor);
      cr.translate(0,8);
      cr.setWidth(this->Completer->popup()->sizeHintForColumn(0)
        + this->Completer->popup()->verticalScrollBar()->sizeHint().width());
      this->Completer->complete(cr);
      }
    else
      {
      this->Completer->popup()->hide();
      }
    }
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::updateCommandBuffer(int commandLength)
{
  if (commandLength == -1)
    {
    commandLength =
        this->commandEnd() - this->InteractivePosition;
    }
  this->commandBuffer() =
      this->toPlainText().mid(this->InteractivePosition, commandLength);
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::replaceCommandBuffer(const QString& text)
{
  this->commandBuffer() = text;

  QTextCursor c(this->document());
  c.setPosition(this->InteractivePosition);
  c.movePosition(QTextCursor::End, QTextCursor::KeepAnchor);
  c.removeSelectedText();
  // all text removed, we need then to re-init our tracker on the message output area
  this->MessageOutputSize = 0;
  this->switchToUserInputTextColor(&c);
  c.insertText(text);
}

//-----------------------------------------------------------------------------
QString& ctkConsolePrivate::commandBuffer()
{
  return this->CommandHistory.back();
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::internalExecuteCommand()
{
  Q_Q(ctkConsole);

  QString command = this->commandBuffer();
  if (this->EditorHints & ctkConsole::RemoveTrailingSpaces)
    {
    command.replace(QRegExp("\\s*$"), ""); // Remove trailing spaces
    this->commandBuffer() = command; // Update buffer
    }

  // First update the history cache. It's essential to update the
  // this->CommandPosition before calling internalExecuteCommand() since that
  // can result in a clearing of the current command (BUG #8765).
  if (!command.isEmpty()) // Don't store empty commands in the history
    {
    this->CommandHistory.push_back("");
    this->CommandPosition = this->CommandHistory.size() - 1;
    }

  QTextCursor c(this->document());
  c.movePosition(QTextCursor::End);
  c.insertText("\n");

  this->InteractivePosition = this->documentEnd();

  emit q->aboutToExecute(command);
  q->executeCommand(command);
  emit q->executed(command);

  // Find the indent for the command.
  QString indent;
  if (this->EditorHints & ctkConsole::AutomaticIndentation)
    {
    QRegExp regExp("^(\\s+)");
    if (regExp.indexIn(command) != -1)
      {
      indent = regExp.cap(1);
      }
    }
  this->promptForInput(indent);
  this->MessageOutputSize = 0;
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::processInput()
{
  QString command = this->commandBuffer();

  if (this->EditorHints & ctkConsole::RemoveTrailingSpaces)
    {
    command.replace(QRegExp("\\s*$"), ""); // Remove trailing spaces
    this->commandBuffer() = command; // Update buffer
    }

  QTextCursor c(this->document());
  c.movePosition(QTextCursor::End);
  c.insertText("\n");

  this->InteractivePosition = this->documentEnd();

  this->InputEventLoop->exit();
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::printString(const QString& text)
{
  this->textCursor().movePosition(QTextCursor::End);
  this->textCursor().insertText(text);
  this->InteractivePosition = this->documentEnd();
}

//----------------------------------------------------------------------------
void ctkConsolePrivate::printOutputMessage(const QString& text)
{
  Q_Q(ctkConsole);
  QString textToPrint = text;
  if (this->MessageOutputSize == 0)
    {
    textToPrint.prepend("\n");
    }
  this->MessageOutputSize += textToPrint.size();
  q->printMessage(textToPrint, q->outputTextColor());
}

//----------------------------------------------------------------------------
void ctkConsolePrivate::printErrorMessage(const QString& text)
{
  Q_Q(ctkConsole);
  QString textToPrint = text;
  if (this->MessageOutputSize == 0)
    {
    textToPrint.prepend("\n");
    }
  this->MessageOutputSize += textToPrint.size();
  q->printMessage(textToPrint, q->errorTextColor());
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::printCommand(const QString& cmd)
{
  this->textCursor().insertText(cmd);
  this->updateCommandBuffer();
}

//----------------------------------------------------------------------------
void ctkConsolePrivate::promptForInput(const QString& indent)
{
  Q_Q(ctkConsole);

  QTextCharFormat format = q->getFormat();
  format.setForeground(q->promptColor());
  q->setFormat(format);

  if(!this->MultilineStatement)
    {
    this->prompt(q->ps1());
    this->MessageOutputSize=0;
    }
  else
    {
    this->prompt(q->ps2());
    }
  this->printCommand(indent);
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::prompt(const QString& text)
{
  QTextCursor text_cursor = this->textCursor();

  // If the cursor is currently on a clean line, do nothing, otherwise we move
  // the cursor to a new line before showing the prompt.
  text_cursor.movePosition(QTextCursor::StartOfLine);
  int startpos = text_cursor.position();
  text_cursor.movePosition(QTextCursor::EndOfLine);
  int endpos = text_cursor.position();
  if (endpos != startpos)
    {
    this->textCursor().insertText("\n");
    }

  this->textCursor().insertText(text);
  this->InteractivePosition = this->documentEnd();
}

//----------------------------------------------------------------------------
void ctkConsolePrivate::printWelcomeMessage()
{
  Q_Q(ctkConsole);

  q->printMessage(
    QLatin1String("CTK Console"),
    q->welcomeTextColor());
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::insertCompletion(const QString& completion)
{
  Q_Q(ctkConsole);
  QTextCursor tc = this->textCursor();
  tc.movePosition(QTextCursor::Left, QTextCursor::KeepAnchor);
  if (tc.selectedText()==".")
    {
    tc.insertText(QString(".") + completion);
    }
  else
    {
    tc = this->textCursor();
    tc.movePosition(QTextCursor::StartOfWord, QTextCursor::MoveAnchor);
    tc.movePosition(QTextCursor::EndOfWord, QTextCursor::KeepAnchor);
    tc.insertText(completion);
    this->setTextCursor(tc);
    }
  tc.movePosition(QTextCursor::StartOfBlock);
  tc.movePosition(QTextCursor::EndOfBlock, QTextCursor::KeepAnchor);
  QString shellLine = tc.selectedText();
  shellLine.replace(q->ps1(), "");
  shellLine.replace(q->ps2(), "");
  tc.movePosition(QTextCursor::EndOfLine, QTextCursor::MoveAnchor);
  this->setTextCursor(tc);
  int cursorOffset = this->Completer->cursorOffset(shellLine);
  tc.movePosition(QTextCursor::Left, QTextCursor::MoveAnchor, cursorOffset);
  this->setTextCursor(tc);
  this->updateCommandBuffer();
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::onScrollBarValueChanged(int value)
{
  this->ScrollbarAtBottom = (this->verticalScrollBar()->maximum() == value);
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::onTextChanged()
{
  this->scrollToBottom();
  this->ensureCursorVisible();
}

//-----------------------------------------------------------------------------
bool ctkConsolePrivate::isCursorInHistoryArea()const
{
  return this->textCursor().anchor() < this->InteractivePosition
    || this->textCursor().position() < this->InteractivePosition;
}

//-----------------------------------------------------------------------------
bool ctkConsolePrivate::isCursorInMessageOutputArea()const
{
  return this->textCursor().anchor() > this->commandEnd()
    || this->textCursor().position() > this->commandEnd();
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::insertFromMimeData(const QMimeData* source)
{
  if (this->isCursorInHistoryArea())
    {
    QTextCursor textCursor = this->textCursor();
    textCursor.movePosition(QTextCursor::End, QTextCursor::MoveAnchor);
    this->setTextCursor(textCursor);
    }
  const QString text = source->text();
  if (!text.isEmpty())
    {
    this->pasteText(text);
    }
  else
    {
    this->Superclass::insertFromMimeData(source);
    }
}

//-----------------------------------------------------------------------------
void ctkConsolePrivate::pasteText(const QString& text)
{
  if(text.isNull())
    {
    return;
    }
  QTextCursor textCursor = this->textCursor();
  if (this->EditorHints & ctkConsole::SplitCopiedTextByLine)
    {
    QStringList lines = text.split(QRegExp("(?:\r\n|\r|\n)"));
    for(int i=0; i < lines.count(); ++i)
      {
      this->switchToUserInputTextColor(&textCursor);
      textCursor.insertText(lines.at(i));
      this->updateCommandBuffer();
      if (i < lines.count() - 1)
        {
        this->internalExecuteCommand();
        }
      }
    }
  else
    {
    this->switchToUserInputTextColor(&textCursor);
    textCursor.insertText(text);
    this->updateCommandBuffer();
    }
}

//-----------------------------------------------------------------------------
// ctkConsole methods

//-----------------------------------------------------------------------------
ctkConsole::ctkConsole(QWidget* parentObject) :
  Superclass(parentObject),
  d_ptr(new ctkConsolePrivate(*this))
{
  Q_D(ctkConsole);
  d->init();
}

//-----------------------------------------------------------------------------
ctkConsole::ctkConsole(ctkConsolePrivate * pimpl, QWidget* parentObject) :
  QWidget(parentObject), d_ptr(pimpl)
{
  Q_D(ctkConsole);
  d->init();
}

//-----------------------------------------------------------------------------
ctkConsole::~ctkConsole()
{
}

//-----------------------------------------------------------------------------
QTextCharFormat ctkConsole::getFormat() const
{
  Q_D(const ctkConsole);
  return d->currentCharFormat();
}

//-----------------------------------------------------------------------------
void ctkConsole::setFormat(const QTextCharFormat& Format)
{
  Q_D(ctkConsole);
  d->setCurrentCharFormat(Format);
}

//-----------------------------------------------------------------------------
QFont ctkConsole::shellFont() const
{
  Q_D(const ctkConsole);
  return d->currentFont();
}

//-----------------------------------------------------------------------------
void ctkConsole::setShellFont(const QFont& font)
{
  Q_D(ctkConsole);
  int savedPosition = d->textCursor().position();
  d->selectAll();
  d->setCurrentFont(font);
  QTextCursor tc = d->textCursor();
  tc.clearSelection();
  tc.setPosition(savedPosition);
  d->setTextCursor(tc);
}

//-----------------------------------------------------------------------------
CTK_GET_CPP(ctkConsole, ctkConsoleCompleter*, completer, Completer);

//-----------------------------------------------------------------------------
void ctkConsole::setCompleter(ctkConsoleCompleter* completer)
{
  Q_D(ctkConsole);
  d->setCompleter(completer);
}

//-----------------------------------------------------------------------------
CTK_GET_CPP(ctkConsole, QColor, promptColor, PromptColor);
CTK_SET_CPP(ctkConsole, const QColor&, setPromptColor, PromptColor);

//-----------------------------------------------------------------------------
CTK_GET_CPP(ctkConsole, QColor, outputTextColor, OutputTextColor);
CTK_SET_CPP(ctkConsole, const QColor&, setOutputTextColor, OutputTextColor);

//-----------------------------------------------------------------------------
CTK_GET_CPP(ctkConsole, QColor, errorTextColor, ErrorTextColor);
CTK_SET_CPP(ctkConsole, const QColor&, setErrorTextColor, ErrorTextColor);

//-----------------------------------------------------------------------------
CTK_GET_CPP(ctkConsole, QColor, stdinTextColor, StdinTextColor);
CTK_SET_CPP(ctkConsole, const QColor&, setStdinTextColor, StdinTextColor);

//-----------------------------------------------------------------------------
CTK_GET_CPP(ctkConsole, QColor, commandTextColor, CommandTextColor);
CTK_SET_CPP(ctkConsole, const QColor&, setCommandTextColor, CommandTextColor);

//-----------------------------------------------------------------------------
CTK_GET_CPP(ctkConsole, QColor, welcomeTextColor, WelcomeTextColor);
CTK_SET_CPP(ctkConsole, const QColor&, setWelcomeTextColor, WelcomeTextColor);

//-----------------------------------------------------------------------------
QColor ctkConsole::backgroundColor()const
{
  Q_D(const ctkConsole);
  QPalette pal = d->palette();
  return pal.color(QPalette::Base);
}

//-----------------------------------------------------------------------------
void ctkConsole::setBackgroundColor(const QColor& newColor)
{
  Q_D(ctkConsole);
  if (this->backgroundColor() == newColor)
    {
    return;
    }
  QPalette pal = this->palette();
  pal.setColor(QPalette::Base, newColor);
  d->setPalette(pal);
}

//-----------------------------------------------------------------------------
CTK_GET_CPP(ctkConsole, QString, ps1, Ps1);
CTK_SET_CPP(ctkConsole, const QString&, setPs1, Ps1);

//-----------------------------------------------------------------------------
CTK_GET_CPP(ctkConsole, QString, ps2, Ps2);
CTK_SET_CPP(ctkConsole, const QString&, setPs2, Ps2);

//-----------------------------------------------------------------------------
CTK_GET_CPP(ctkConsole, ctkConsole::EditorHints, editorHints, EditorHints);
CTK_SET_CPP(ctkConsole, const ctkConsole::EditorHints&, setEditorHints, EditorHints);

//-----------------------------------------------------------------------------
int ctkConsole::cursorPosition() const
{
  Q_D(const ctkConsole);
  return d->textCursor().position();
}

//-----------------------------------------------------------------------------
int ctkConsole::cursorColumn() const
{
  Q_D(const ctkConsole);
  QTextCursor cursor = d->textCursor();
  cursor.movePosition(QTextCursor::StartOfLine);
  return d->textCursor().position() - cursor.position();
}

//-----------------------------------------------------------------------------
int ctkConsole::cursorLine() const
{
  Q_D(const ctkConsole);
  QTextCursor cursor = d->textCursor();
  cursor.movePosition(QTextCursor::StartOfLine);
  int lines = 1;
  QTextBlock block = cursor.block().previous();
  while(block.isValid())
    {
    lines += block.lineCount();
    block = block.previous();
    }
  return lines;
}

//-----------------------------------------------------------------------------
Qt::ScrollBarPolicy ctkConsole::scrollBarPolicy()const
{
  Q_D(const ctkConsole);
  return d->verticalScrollBarPolicy();
}

//-----------------------------------------------------------------------------
void ctkConsole::setScrollBarPolicy(const Qt::ScrollBarPolicy& newScrollBarPolicy)
{
  Q_D(ctkConsole);
  d->setVerticalScrollBarPolicy(newScrollBarPolicy);
}

//-----------------------------------------------------------------------------
CTK_GET_CPP(ctkConsole, QList<QKeySequence>, completerShortcuts, CompleterShortcuts);

//-----------------------------------------------------------------------------
void ctkConsole::setCompleterShortcuts(const QList<QKeySequence>& keys)
{
  Q_D(ctkConsole);
  d->CompleterShortcuts = keys;
}

//-----------------------------------------------------------------------------
void ctkConsole::addCompleterShortcut(const QKeySequence& key)
{
  Q_D(ctkConsole);
  if (!d->CompleterShortcuts.contains(key))
    {
    d->CompleterShortcuts.append(key);
    }
}

//-----------------------------------------------------------------------------
CTK_GET_CPP(ctkConsole, ctkConsole::RunFileOptions, runFileOptions, RunFileOptions);

//-----------------------------------------------------------------------------
void ctkConsole::setRunFileOptions(const RunFileOptions& newOptions)
{
  Q_D(ctkConsole);
  d->RunFileButton->setVisible(newOptions.testFlag(ctkConsole::RunFileButton));
  d->RunFileAction->setEnabled(newOptions.testFlag(ctkConsole::RunFileShortcut));
}

//-----------------------------------------------------------------------------
void ctkConsole::exec(const QString& command)
{
  Q_D(ctkConsole);
  d->replaceCommandBuffer(command);
  d->internalExecuteCommand();
}

//-----------------------------------------------------------------------------
void ctkConsole::runFile(const QString& filePath)
{
  QFile file(filePath);
  if (!file.open(QIODevice::ReadOnly))
    {
    qWarning() << tr( "File '%1' can't be read.").arg(filePath);
    return;
    }
  for (QTextStream fileStream(&file); !fileStream.atEnd();)
    {
    QString line = fileStream.readLine();
    this->exec(line);
    }
}

//-----------------------------------------------------------------------------
void ctkConsole::runFile()
{
  QString filePath =
    QFileDialog::getOpenFileName(this, tr("Select a script file to run"));
  if (!filePath.isEmpty())
    {
    this->runFile(filePath);
    }
}

//-----------------------------------------------------------------------------
void ctkConsole::printHelp()
{
  this->printMessage("\n", Qt::gray);
  this->printMessage(tr("CTRL+h: Print this help message\n"), Qt::gray);
  this->printMessage(tr("CTRL+r: Open a file dialog to select a file to run\n"), Qt::gray);
}

//-----------------------------------------------------------------------------
void ctkConsole::executeCommand(const QString& command)
{
  qWarning() << "ctkConsole::executeCommand not implemented !";
  qWarning() << "command:" << command;
}

//----------------------------------------------------------------------------
void ctkConsole::printMessage(const QString& message, const QColor& color)
{
  Q_D(ctkConsole);

  QTextCharFormat format = this->getFormat();
  format.setForeground(color);
  this->setFormat(format);
  d->printString(message);
}

//-----------------------------------------------------------------------------
void ctkConsole::clear()
{
  Q_D(ctkConsole);

  d->clear();

  // For some reason the QCompleter tries to set the focus policy to
  // NoFocus, set let's make sure we set it back to the default WheelFocus.
  d->setFocusPolicy(Qt::WheelFocus);

  d->promptForInput();
}

//-----------------------------------------------------------------------------
void ctkConsole::reset()
{
  Q_D(ctkConsole);

  d->clear();

  // For some reason the QCompleter tries to set the focus policy to
  // NoFocus, set let's make sure we set it back to the default WheelFocus.
  d->setFocusPolicy(Qt::WheelFocus);

  d->printWelcomeMessage();
  d->promptForInput();
}

//-----------------------------------------------------------------------------
QString ctkConsole::stdInRedirectCallBack(void * callData)
{
  ctkConsole * self = reinterpret_cast<ctkConsole*>(callData);
  Q_ASSERT(self);
  if (!self)
    {
    return QLatin1String("");
    }

  return self->readInputLine();
}

namespace
{
class InputEventLoop : public QEventLoop
{
public:
  InputEventLoop(QApplication * app, QObject * parentObject = 0) :
    QEventLoop(parentObject), App(app){}
  virtual bool processEvents(ProcessEventsFlags flags = AllEvents)
    {
    this->App->processEvents(flags);
    return true;
    }
  QApplication * App;
};

}

//-----------------------------------------------------------------------------
QString ctkConsole::readInputLine()
{
  Q_D(ctkConsole);

  d->moveCursor(QTextCursor::End);

  QScopedPointer<InputEventLoop> eventLoop(new InputEventLoop(qApp));
  d->InputEventLoop = QPointer<QEventLoop>(eventLoop.data());

  eventLoop->exec();

  return d->commandBuffer();
}