/*

Copyright (C) 2011-2012 Jacob Dawid

This file is part of Octave.

Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3 of the License, or (at your
option) any later version.

Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING.  If not, see
<http://www.gnu.org/licenses/>.

*/

#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "file-editor.h"
#include "resource-manager.h"
#include <QVBoxLayout>
#include <QApplication>
#include <QFile>
#include <QFont>
#include <QFileDialog>
#include <QMessageBox>
#include <QStyle>
#include <QTextStream>

#include "octave-link.h"

file_editor::file_editor (QWidget *p)
  : file_editor_interface (p)
{
  // Set current editing directory before construct because loaded
  // files will change ced accordingly.
  ced = QDir::currentPath ();

  construct ();

  setVisible (false);
}

file_editor::~file_editor ()
{
  QSettings *settings = resource_manager::get_settings ();
  fetFileNames.clear ();
  if (settings->value ("editor/restoreSession",true).toBool ())
    {
      // Have all file editor tabs signal what their file names are.
      emit fetab_file_name_query (0);
    }
  settings->setValue ("editor/savedSessionTabs", fetFileNames);
  settings->sync ();
}

QMenu *
file_editor::debug_menu ()
{
  return _debug_menu;
}

QToolBar *
file_editor::toolbar ()
{
  return _tool_bar;
}

void
file_editor::handle_entered_debug_mode ()
{
  _run_action->setEnabled (false);
}

void
file_editor::handle_quit_debug_mode ()
{
  _run_action->setEnabled (true);
}

void
file_editor::request_new_file ()
{
  // New file isn't a file_editor_tab function since the file
  // editor tab has yet to be created and there is no object to
  // pass a signal to.  Hence, functionality is here.

  file_editor_tab *fileEditorTab = new file_editor_tab (ced);
  if (fileEditorTab)
    {
      add_file_editor_tab (fileEditorTab, UNNAMED_FILE);
      fileEditorTab->new_file ();
    }
}

void
file_editor::request_open_file ()
{
  // Open file isn't a file_editor_tab function since the file
  // editor tab has yet to be created and there is no object to
  // pass a signal to.  Hence, functionality is here.

  // Create a NonModal message.
  QFileDialog* fileDialog = new QFileDialog (this);
  fileDialog->setNameFilter (SAVE_FILE_FILTER);
  fileDialog->setAcceptMode (QFileDialog::AcceptOpen);
  fileDialog->setViewMode (QFileDialog::Detail);
  fileDialog->setDirectory (ced);
  connect (fileDialog, SIGNAL (fileSelected (const QString&)),
           this, SLOT (request_open_file (const QString&)));
  fileDialog->setWindowModality (Qt::NonModal);
  fileDialog->setAttribute (Qt::WA_DeleteOnClose);
  fileDialog->show ();
}

void
file_editor::request_open_file (const QString& openFileName)
{
  if (openFileName.isEmpty ())
    {
      // ??  Not sure this will happen.  This routine isn't even called
      // if the user hasn't selected a file.
    }
  else
    {
      // Have all file editor tabs signal what their file names are.
      fetFileNames.clear ();
      emit fetab_file_name_query (0);

      // Check whether this file is already open in the editor.
      if (fetFileNames.contains (openFileName, Qt::CaseSensitive))
        {
          // Create a NonModal message so nothing is blocked and
          // bring the existing file forward.
          QMessageBox* msgBox = new QMessageBox (
                  QMessageBox::Critical, tr ("Octave Editor"),
                  tr ("File %1 is already open in the editor.").
                  arg (openFileName), QMessageBox::Ok, 0);
          msgBox->setWindowModality (Qt::NonModal);
          msgBox->setAttribute (Qt::WA_DeleteOnClose);
          msgBox->show ();
          QFileInfo file(openFileName);
          QString short_openFileName = file.fileName();  // get file name only
          for(int i = 0; i < _tab_widget->count (); i++)
            { // check whether tab title is file name (long or short)
              if (_tab_widget->tabText (i) == openFileName ||
                  _tab_widget->tabText (i) == short_openFileName)
                {
                  _tab_widget->setCurrentIndex (i);
                  break;
                }
            }
          return;
        }

      file_editor_tab *fileEditorTab = new file_editor_tab ();
      if (fileEditorTab)
        {
          QString result = fileEditorTab->load_file(openFileName);
          if (result == "")
            {
              // Supply empty title then have the file_editor_tab update
              // with full or short name.
              add_file_editor_tab (fileEditorTab, "");
              fileEditorTab->update_window_title (false);
              // file already loaded, add file to mru list here
              handle_mru_add_file(QDir::cleanPath (openFileName));
            }
          else
            {
              delete fileEditorTab;
              // Create a NonModal message about error.
              QMessageBox* msgBox = new QMessageBox (
                      QMessageBox::Critical, tr ("Octave Editor"),
                      tr ("Could not open file %1 for read:\n%2.").
                      arg (openFileName).arg (result),
                      QMessageBox::Ok, 0);
              msgBox->setWindowModality (Qt::NonModal);
              msgBox->setAttribute (Qt::WA_DeleteOnClose);
              msgBox->show ();
            }
        }
    }
}

// open a file from the mru list
void
file_editor::request_mru_open_file ()
{
  QAction *action = qobject_cast<QAction *>(sender ());
  if (action)
    {
      request_open_file (action->data ().toString ());
    }
}


void
file_editor::check_conflict_save (const QString& saveFileName, bool remove_on_success)
{
  // Have all file editor tabs signal what their file names are.
  fetFileNames.clear ();
  emit fetab_file_name_query (0);

  // If one of those names matches the desired name, that's a conflict.
  if (fetFileNames.contains (saveFileName, Qt::CaseSensitive))
    {
      // Note: to overwrite the contents of some other file editor tab
      // with the same name requires identifying which file editor tab
      // that is (not too difficult) then close that tab.  Of course,
      // that could trigger another dialog box if the file editor tab
      // with the same name has modifications in it.  This could become
      // somewhat confusing to the user.  For now, opt to do nothing.

      // Create a NonModal message about error.
      QMessageBox* msgBox = new QMessageBox (
              QMessageBox::Critical, tr ("Octave Editor"),
              tr ("File not saved!  You've selected a file name\n\n     %1\n\nwhich is the same as an already open file in the editor.  (Could allow overwriting, with message, if that is what folks want.)").
              arg (saveFileName),
              QMessageBox::Ok, 0);
      msgBox->setWindowModality (Qt::NonModal);
      msgBox->setAttribute (Qt::WA_DeleteOnClose);
      msgBox->show ();

      return;
    }

  QObject* saveFileObject = sender ();
  QWidget* saveFileWidget = 0;
  for(int i = 0; i < _tab_widget->count (); i++)
    {
      if (_tab_widget->widget (i) == saveFileObject)
        {
          saveFileWidget = _tab_widget->widget (i);
          break;
        }
    }
  if (!saveFileWidget)
    {
      // Create a NonModal message about error.
      QMessageBox* msgBox = new QMessageBox (
              QMessageBox::Critical, tr ("Octave Editor"),
              tr ("The associated file editor tab has disappeared.  It was likely closed by some means."),
              QMessageBox::Ok, 0);
      msgBox->setWindowModality (Qt::NonModal);
      msgBox->setAttribute (Qt::WA_DeleteOnClose);
      msgBox->show ();
      return;
    }

  // Can save without conflict, have the file editor tab do so.
  emit fetab_save_file (saveFileWidget, saveFileName, remove_on_success);
}

void
file_editor::request_undo ()
{
  emit fetab_undo (_tab_widget->currentWidget ());
}

void
file_editor::request_redo ()
{
  emit fetab_redo (_tab_widget->currentWidget ());
}

void
file_editor::request_copy ()
{
  emit fetab_copy (_tab_widget->currentWidget ());
}

void
file_editor::request_cut ()
{
  emit fetab_cut (_tab_widget->currentWidget ());
}

void
file_editor::request_paste ()
{
  emit fetab_paste (_tab_widget->currentWidget ());
}

void
file_editor::request_save_file ()
{
  emit fetab_save_file (_tab_widget->currentWidget ());
}

void
file_editor::request_save_file_as ()
{
   emit fetab_save_file_as (_tab_widget->currentWidget ());
}

void
file_editor::request_run_file ()
{
  emit fetab_run_file (_tab_widget->currentWidget ());
}

void
file_editor::request_toggle_bookmark ()
{
  emit fetab_toggle_bookmark (_tab_widget->currentWidget ());
}

void
file_editor::request_next_bookmark ()
{
  emit fetab_next_bookmark (_tab_widget->currentWidget ());
}

void
file_editor::request_previous_bookmark ()
{
  emit fetab_previous_bookmark (_tab_widget->currentWidget ());
}

void
file_editor::request_remove_bookmark ()
{
  emit fetab_remove_bookmark (_tab_widget->currentWidget ());
}

void
file_editor::request_toggle_breakpoint ()
{
  emit fetab_toggle_breakpoint (_tab_widget->currentWidget ());
}

void
file_editor::request_next_breakpoint ()
{
  emit fetab_next_breakpoint (_tab_widget->currentWidget ());
}

void
file_editor::request_previous_breakpoint ()
{
  emit fetab_previous_breakpoint (_tab_widget->currentWidget ());
}

void
file_editor::request_remove_breakpoint ()
{
  emit fetab_remove_all_breakpoints (_tab_widget->currentWidget ());
}

void
file_editor::request_comment_selected_text ()
{
  emit fetab_comment_selected_text (_tab_widget->currentWidget ());
}

void
file_editor::request_uncomment_selected_text ()
{
  emit fetab_uncomment_selected_text (_tab_widget->currentWidget ());
}

void
file_editor::request_find ()
{
  emit fetab_find (_tab_widget->currentWidget ());
}

void
file_editor::handle_mru_add_file (const QString& file_name)
{
  _mru_files.removeAll (file_name);
  _mru_files.prepend (file_name);
  mru_menu_update ();
}

void
file_editor::mru_menu_update ()
{
  int num_files = qMin (_mru_files.size(), int (MaxMRUFiles));
  // configure and show active actions of mru-menu
  for (int i = 0; i < num_files; ++i)
    {
      QString text = tr("&%1 %2").
          arg ((i+1) % int (MaxMRUFiles)).arg (_mru_files.at (i));
      _mru_file_actions[i]->setText (text);
      _mru_file_actions[i]->setData (_mru_files.at (i));
      _mru_file_actions[i]->setVisible (true);
    }
    // hide unused mru-menu entries
    for (int j = num_files; j < MaxMRUFiles; ++j)
      _mru_file_actions[j]->setVisible (false);
    // delete entries in string-list beyond MaxMRUFiles
    while (_mru_files.size () > MaxMRUFiles)
      _mru_files.removeLast ();
    // save actual mru-list in settings
    QSettings *settings = resource_manager::get_settings ();
    // FIXME -- what should happen if settings is 0?
    settings->setValue ("editor/mru_file_list",_mru_files);
}

void
file_editor::handle_file_name_changed (const QString& fileName)
{
  QObject *fileEditorTab = sender();
  if (fileEditorTab)
    {
      for(int i = 0; i < _tab_widget->count (); i++)
        {
          if (_tab_widget->widget (i) == fileEditorTab)
            {
              _tab_widget->setTabText (i, fileName);
            }
        }
    }
}

void
file_editor::handle_tab_close_request (int index)
{
  // Signal to the tabs a request to close whomever matches the identifying
  // tag (i.e., unique widget pointer).  The reason for this indirection is
  // that it will enable a file editor widget to toss up a non-static
  // dialog box and later signal that it wants to be removed.
  QWidget *tabID = _tab_widget->widget (index);
  emit fetab_close_request (tabID);
}

void
file_editor::handle_tab_remove_request ()
{
  QObject *fileEditorTab = sender();
  if (fileEditorTab)
    {
      for(int i = 0; i < _tab_widget->count (); i++)
        {
          if (_tab_widget->widget (i) == fileEditorTab)
            {
              _tab_widget->removeTab (i);
              delete fileEditorTab;
            }
        }
    }
}

void
file_editor::handle_add_filename_to_list (const QString& fileName)
{
  fetFileNames.append (fileName);
}

void
file_editor::active_tab_changed (int index)
{
  emit fetab_change_request (_tab_widget->widget (index));
}

void
file_editor::handle_editor_state_changed (bool copy_available, const QString& file_name)
{
  // In case there is some scenario where traffic could be coming from
  // all the file editor tabs, just process info from the current active tab.
  if (sender() == _tab_widget->currentWidget ())
    {
      _copy_action->setEnabled (copy_available);
      _cut_action->setEnabled (copy_available);
      if (!file_name.isEmpty ())
        {
          ced = QDir::cleanPath (file_name);
          int lastslash = ced.lastIndexOf ('/');
          // Test against > 0 because if somehow the directory is "/" the
          // slash should be retained.  Otherwise, last slash is removed.
          if (lastslash > 0 && lastslash != ced.count ())
            {
              ced = ced.left (lastslash);
            }
        }
      setFocusProxy (_tab_widget->currentWidget ());
    }
}

void
file_editor::notice_settings ()
{
  // Relay signal to file editor tabs.
  emit fetab_settings_changed ();
}

// slot for signal that is emitted when floating property changes
void
file_editor::top_level_changed (bool floating)
{
  if(floating)
    {
      setWindowFlags(Qt::Window);  // make a window from the widget when floating
      show();                      // make it visible again since setWindowFlag hides it
    }
}

void
file_editor::construct ()
{
  QWidget *editor_widget = new QWidget (this);
  QStyle *editor_style = QApplication::style ();

  _menu_bar = new QMenuBar (editor_widget);
  _tool_bar = new QToolBar (editor_widget);
  _tab_widget = new QTabWidget (editor_widget);
  _tab_widget->setTabsClosable (true);

  QAction *new_action = new QAction (QIcon(":/actions/icons/filenew.png"),
                                     tr("&New File"), _tool_bar);

  QAction *open_action = new QAction (QIcon(":/actions/icons/fileopen.png"),
                                      tr("&Open File"), _tool_bar);

  QAction *save_action = new QAction (QIcon(":/actions/icons/filesave.png"),
                                      tr("&Save File"), _tool_bar);

  QAction *save_as_action
    = new QAction (QIcon(":/actions/icons/filesaveas.png"),
                   tr("Save File &As"), _tool_bar);

  QAction *undo_action = new QAction (QIcon(":/actions/icons/undo.png"),
                                      tr("&Undo"), _tool_bar);

  QAction *redo_action = new QAction (QIcon(":/actions/icons/redo.png"),
                                      tr("&Redo"), _tool_bar);

  _copy_action = new QAction (QIcon(":/actions/icons/editcopy.png"),
                              tr ("&Copy"), _tool_bar);

  _cut_action  = new QAction (QIcon(":/actions/icons/editcut.png"),
                              tr ("Cu&t"), _tool_bar);

  QAction *paste_action
    = new QAction (QIcon (":/actions/icons/editpaste.png"),
                   tr("Paste"), _tool_bar);
  QAction *next_bookmark_action       = new QAction (tr ("&Next Bookmark"),_tool_bar);
  QAction *previous_bookmark_action   = new QAction (tr ("Pre&vious Bookmark"),_tool_bar);
  QAction *toggle_bookmark_action     = new QAction (tr ("Toggle &Bookmark"),_tool_bar);
  QAction *remove_bookmark_action     = new QAction (tr ("&Remove All Bookmarks"),_tool_bar);

  QAction *next_breakpoint_action
    = new QAction (QIcon (":/actions/icons/bp_next.png"),
                   tr ("&Next breakpoint"), _tool_bar);
  QAction *previous_breakpoint_action
    = new QAction (QIcon (":/actions/icons/bp_prev.png"),
                   tr ("Pre&vious breakpoint"), _tool_bar);
  QAction *toggle_breakpoint_action
    = new QAction (QIcon (":/actions/icons/bp_toggle.png"),
                   tr ("Toggle &breakpoint"), _tool_bar);
  QAction *remove_all_breakpoints_action
    = new QAction (QIcon (":/actions/icons/bp_rm_all.png"),
                   tr ("&Remove All breakpoints"), _tool_bar);

  QAction *comment_selection_action   = new QAction (tr ("&Comment Selected Text"),_tool_bar);
  QAction *uncomment_selection_action = new QAction (tr ("&Uncomment Selected Text"),_tool_bar);

  QAction *find_action = new QAction (QIcon(":/actions/icons/find.png"),
                                      tr ("&Find and Replace"), _tool_bar);

  _run_action = new QAction (QIcon(":/actions/icons/artsbuilderexecute.png"),
                             tr("Save File And Run"), _tool_bar);

  // the mru-list and an empty array of actions
  QSettings *settings = resource_manager::get_settings ();
  // FIXME -- what should happen if settings is 0?
  _mru_files = settings->value ("editor/mru_file_list").toStringList ();
  for (int i = 0; i < MaxMRUFiles; ++i)
    {
       _mru_file_actions[i] = new QAction (this);
       _mru_file_actions[i]->setVisible (false);
    }

  // some actions are disabled from the beginning
  _copy_action->setEnabled(false);
  _cut_action->setEnabled(false);
  _run_action->setShortcut                      (Qt::ControlModifier+ Qt::Key_R);
  _run_action->setShortcutContext               (Qt::WindowShortcut);
  next_bookmark_action->setShortcut             (Qt::Key_F2);
  next_bookmark_action->setShortcutContext      (Qt::WindowShortcut);
  previous_bookmark_action->setShortcut         (Qt::SHIFT + Qt::Key_F2);
  previous_bookmark_action->setShortcutContext  (Qt::WindowShortcut);
  toggle_bookmark_action->setShortcut           (Qt::Key_F7);
  toggle_bookmark_action->setShortcutContext    (Qt::WindowShortcut);
  comment_selection_action->setShortcut         (Qt::ControlModifier + Qt::Key_7);
  comment_selection_action->setShortcutContext  (Qt::WindowShortcut);
  uncomment_selection_action->setShortcut       (Qt::ControlModifier + Qt::Key_8);
  uncomment_selection_action->setShortcutContext(Qt::WindowShortcut);
  find_action->setShortcut                      (Qt::ControlModifier+Qt::Key_F);
  find_action->setShortcutContext               (Qt::WindowShortcut);

  // toolbar
  _tool_bar->addAction (new_action);
  _tool_bar->addAction (open_action);
  _tool_bar->addAction (save_action);
  _tool_bar->addAction (save_as_action);
  _tool_bar->addSeparator ();
  _tool_bar->addAction (undo_action);
  _tool_bar->addAction (redo_action);
  _tool_bar->addAction (_copy_action);
  _tool_bar->addAction (_cut_action);
  _tool_bar->addAction (paste_action);
  _tool_bar->addSeparator ();
  _tool_bar->addAction (find_action);
  _tool_bar->addAction (_run_action);
  _tool_bar->addSeparator ();
  _tool_bar->addAction (toggle_breakpoint_action);
  _tool_bar->addAction (next_breakpoint_action);
  _tool_bar->addAction (previous_breakpoint_action);
  _tool_bar->addAction (remove_all_breakpoints_action);

  // menu bar
  QMenu *fileMenu = new QMenu (tr ("&File"), _menu_bar);
  fileMenu->addAction (new_action);
  fileMenu->addAction (open_action);
  fileMenu->addAction (save_action);
  fileMenu->addAction (save_as_action);
  fileMenu->addSeparator ();
  QMenu *mru_file_menu = new QMenu (tr ("Open &Recent"), fileMenu);
  for (int i = 0; i < MaxMRUFiles; ++i)
    {
      mru_file_menu->addAction (_mru_file_actions[i]);
    }
  fileMenu->addMenu (mru_file_menu);
  _menu_bar->addMenu (fileMenu);

  QMenu *editMenu = new QMenu (tr ("&Edit"), _menu_bar);
  editMenu->addAction (undo_action);
  editMenu->addAction (redo_action);
  editMenu->addSeparator ();
  editMenu->addAction (_copy_action);
  editMenu->addAction (_cut_action);
  editMenu->addAction (paste_action);
  editMenu->addSeparator ();
  editMenu->addAction (find_action);
  editMenu->addSeparator ();
  editMenu->addAction (comment_selection_action);
  editMenu->addAction (uncomment_selection_action);
  editMenu->addSeparator ();
  editMenu->addAction (toggle_bookmark_action);
  editMenu->addAction (next_bookmark_action);
  editMenu->addAction (previous_bookmark_action);
  editMenu->addAction (remove_bookmark_action);
  _menu_bar->addMenu (editMenu);

  _debug_menu = new QMenu (tr ("&Debug"), _menu_bar);
  _debug_menu->addAction (toggle_breakpoint_action);
  _debug_menu->addAction (next_breakpoint_action);
  _debug_menu->addAction (previous_breakpoint_action);
  _debug_menu->addAction (remove_all_breakpoints_action);
  _debug_menu->addSeparator ();
  // The other debug actions will be added by the main window.
  _menu_bar->addMenu (_debug_menu);

  QMenu *_run_menu = new QMenu (tr ("&Run"), _menu_bar);
  _run_menu->addAction (_run_action);
  _menu_bar->addMenu (_run_menu);

  QVBoxLayout *vbox_layout = new QVBoxLayout ();
  vbox_layout->addWidget (_menu_bar);
  vbox_layout->addWidget (_tool_bar);
  vbox_layout->addWidget (_tab_widget);
  vbox_layout->setMargin (0);
  editor_widget->setLayout (vbox_layout);
  setWidget (editor_widget);

  connect (new_action,
           SIGNAL (triggered ()), this, SLOT (request_new_file ()));
  connect (open_action,
           SIGNAL (triggered ()), this, SLOT (request_open_file ()));
  connect (undo_action,
           SIGNAL (triggered ()), this, SLOT (request_undo ()));
  connect (redo_action,
           SIGNAL (triggered ()), this, SLOT (request_redo ()));
  connect (_copy_action,
           SIGNAL (triggered ()), this, SLOT (request_copy ()));
  connect (_cut_action,
           SIGNAL (triggered ()), this, SLOT (request_cut ()));
  connect (paste_action,
           SIGNAL (triggered ()), this, SLOT (request_paste ()));
  connect (save_action,
           SIGNAL (triggered ()), this, SLOT (request_save_file ()));
  connect (save_as_action,
           SIGNAL (triggered ()), this, SLOT (request_save_file_as ()));
  connect (_run_action,
           SIGNAL (triggered ()), this, SLOT (request_run_file ()));
  connect (toggle_bookmark_action,
           SIGNAL (triggered ()), this, SLOT (request_toggle_bookmark ()));
  connect (next_bookmark_action,
           SIGNAL (triggered ()), this, SLOT (request_next_bookmark ()));
  connect (previous_bookmark_action,
           SIGNAL (triggered ()), this, SLOT (request_previous_bookmark ()));
  connect (remove_bookmark_action,
           SIGNAL (triggered ()), this, SLOT (request_remove_bookmark ()));
  connect (toggle_breakpoint_action,
           SIGNAL (triggered ()), this, SLOT (request_toggle_breakpoint ()));
  connect (next_breakpoint_action,
           SIGNAL (triggered ()), this, SLOT (request_next_breakpoint ()));
  connect (previous_breakpoint_action,
           SIGNAL (triggered ()), this, SLOT (request_previous_breakpoint ()));
  connect (remove_all_breakpoints_action,
           SIGNAL (triggered ()), this, SLOT (request_remove_breakpoint ()));
  connect (comment_selection_action,
           SIGNAL (triggered ()), this, SLOT (request_comment_selected_text ()));
  connect (uncomment_selection_action,
           SIGNAL (triggered ()), this, SLOT (request_uncomment_selected_text ()));
  connect (find_action,
           SIGNAL (triggered ()), this, SLOT (request_find ()));
  // The actions of the mru file menu
  for (int i = 0; i < MaxMRUFiles; ++i)
    {
      connect(_mru_file_actions[i], SIGNAL (triggered ()), this, SLOT (request_mru_open_file ()));
    }
  mru_menu_update ();
  connect (_tab_widget,
           SIGNAL (tabCloseRequested (int)), this, SLOT (handle_tab_close_request (int)));
  connect (_tab_widget,
           SIGNAL (currentChanged(int)), this, SLOT (active_tab_changed (int)));
  // topLevelChanged is emitted when floating property changes (floating = true)
  connect (this, SIGNAL (topLevelChanged(bool)), this, SLOT(top_level_changed(bool)));

  resize (500, 400);
  setWindowIcon (QIcon(":/actions/icons/logo.png"));
  setWindowTitle ("Editor");

  //restore previous session
  if (settings->value ("editor/restoreSession",true).toBool ())
    {
      QStringList sessionFileNames = settings->value("editor/savedSessionTabs", QStringList()).toStringList ();

      for (int n=0; n < sessionFileNames.count (); ++n)
        request_open_file (sessionFileNames.at (n));
    }
}

void
file_editor::add_file_editor_tab (file_editor_tab *f, const QString &fn)
{
  _tab_widget->addTab (f, fn);

  // Signals from the file editor_tab
  connect (f, SIGNAL (file_name_changed (const QString&)),
           this, SLOT (handle_file_name_changed (const QString&)));
  connect (f, SIGNAL (editor_state_changed (bool, const QString&)),
           this, SLOT (handle_editor_state_changed (bool, const QString&)));
  connect (f, SIGNAL (tab_remove_request ()),
           this, SLOT (handle_tab_remove_request ()));
  connect (f, SIGNAL (add_filename_to_list (const QString&)),
           this, SLOT (handle_add_filename_to_list (const QString&)));
  connect (f, SIGNAL (editor_check_conflict_save (const QString&, bool)),
           this, SLOT (check_conflict_save (const QString&, bool)));
  connect (f, SIGNAL (mru_add_file (const QString&)),
           this, SLOT (handle_mru_add_file (const QString&)));
  connect (f, SIGNAL (process_octave_code (const QString&)),
           parent (), SLOT (handle_command_double_clicked (const QString&)));
  
  // Signals from the file_editor non-trivial operations
  connect (this, SIGNAL (fetab_settings_changed ()),
           f, SLOT (notice_settings ()));
  connect (this, SIGNAL (fetab_close_request (const QWidget*)),
           f, SLOT (conditional_close (const QWidget*)));
  connect (this, SIGNAL (fetab_change_request (const QWidget*)),
           f, SLOT (change_editor_state (const QWidget*)));
  connect (this, SIGNAL (fetab_file_name_query (const QWidget*)),
           f, SLOT (file_name_query (const QWidget*)));
  connect (this, SIGNAL (fetab_save_file (const QWidget*, const QString&, bool)),
           f, SLOT (save_file (const QWidget*, const QString&, bool)));
  // Signals from the file_editor trivial operations
  connect (this, SIGNAL (fetab_undo (const QWidget*)),
           f, SLOT (undo (const QWidget*)));
  connect (this, SIGNAL (fetab_redo (const QWidget*)),
           f, SLOT (redo (const QWidget*)));
  connect (this, SIGNAL (fetab_copy (const QWidget*)),
           f, SLOT (copy (const QWidget*)));
  connect (this, SIGNAL (fetab_cut (const QWidget*)),
           f, SLOT (cut (const QWidget*)));
  connect (this, SIGNAL (fetab_paste (const QWidget*)),
           f, SLOT (paste (const QWidget*)));
  connect (this, SIGNAL (fetab_save_file (const QWidget*)),
           f, SLOT (save_file (const QWidget*)));
  connect (this, SIGNAL (fetab_save_file_as (const QWidget*)),
           f, SLOT (save_file_as (const QWidget*)));
  connect (this, SIGNAL (fetab_run_file (const QWidget*)),
           f, SLOT (run_file (const QWidget*)));
  connect (this, SIGNAL (fetab_toggle_bookmark (const QWidget*)),
           f, SLOT (toggle_bookmark (const QWidget*)));
  connect (this, SIGNAL (fetab_next_bookmark (const QWidget*)),
           f, SLOT (next_bookmark (const QWidget*)));
  connect (this, SIGNAL (fetab_previous_bookmark (const QWidget*)),
           f, SLOT (previous_bookmark (const QWidget*)));
  connect (this, SIGNAL (fetab_remove_bookmark (const QWidget*)),
           f, SLOT (remove_bookmark (const QWidget*)));
  connect (this, SIGNAL (fetab_toggle_breakpoint (const QWidget*)),
           f, SLOT (toggle_breakpoint (const QWidget*)));
  connect (this, SIGNAL (fetab_next_breakpoint (const QWidget*)),
           f, SLOT (next_breakpoint (const QWidget*)));
  connect (this, SIGNAL (fetab_previous_breakpoint (const QWidget*)),
           f, SLOT (previous_breakpoint (const QWidget*)));
  connect (this, SIGNAL (fetab_remove_all_breakpoints (const QWidget*)),
           f, SLOT (remove_all_breakpoints (const QWidget*)));
  connect (this, SIGNAL (fetab_comment_selected_text (const QWidget*)),
           f, SLOT (comment_selected_text (const QWidget*)));
  connect (this, SIGNAL (fetab_uncomment_selected_text (const QWidget*)),
           f, SLOT (uncomment_selected_text (const QWidget*)));
  connect (this, SIGNAL (fetab_find (const QWidget*)),
           f, SLOT (find (const QWidget*)));

  _tab_widget->setCurrentWidget (f);
}