/*

Copyright (C) 2013-2016 John P. Swensen
Copyright (C) 2011-2016 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/>.

*/

#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include "resource-manager.h"
#include "files-dock-widget.h"

#include <QApplication>
#include <QClipboard>
#include <QFileInfo>
#include <QCompleter>
#include <QProcess>
#include <QDebug>
#include <QHeaderView>
#include <QLineEdit>
#include <QSizePolicy>
#include <QMenu>
#include <QInputDialog>
#include <QMessageBox>
#include <QToolButton>
#include <QUrl>
#include <QDesktopServices>
#include <QFileDialog>

#include "load-save.h"
#include "oct-env.h"

class FileTreeViewer : public QTreeView
{
public:

  FileTreeViewer (QWidget *p) : QTreeView (p) { }

  void mousePressEvent (QMouseEvent *e)
  {
    if (e->button () != Qt::RightButton)
      QTreeView::mousePressEvent (e);
  }
};

files_dock_widget::files_dock_widget (QWidget *p)
  : octave_dock_widget (p)
{
  setObjectName ("FilesDockWidget");
  setWindowIcon (QIcon (":/actions/icons/logo.png"));
  set_title (tr ("File Browser"));
  setToolTip (tr ("Browse your files"));

  _sig_mapper = 0;

  _columns_shown = QStringList ();
  _columns_shown.append (tr ("File size"));
  _columns_shown.append (tr ("File type"));
  _columns_shown.append (tr ("Date modified"));
  _columns_shown.append (tr ("Show hidden"));
  _columns_shown.append (tr ("Alternating row colors"));

  _columns_shown_keys = QStringList ();
  _columns_shown_keys.append (tr ("filesdockwidget/showFileSize"));
  _columns_shown_keys.append (tr ("filesdockwidget/showFileType"));
  _columns_shown_keys.append (tr ("filesdockwidget/showLastModified"));
  _columns_shown_keys.append (tr ("filesdockwidget/showHiddenFiles"));
  _columns_shown_keys.append (tr ("filesdockwidget/useAlternatingRowColors"));

  QWidget *container = new QWidget (this);

  setWidget (container);

  connect (this, SIGNAL (open_file (const QString&)),
           main_win (), SLOT (open_file (const QString&)));

  connect (this, SIGNAL (displayed_directory_changed (const QString&)),
           main_win (), SLOT (set_current_working_directory (const QString&)));

  // Create a toolbar
  _navigation_tool_bar = new QToolBar ("", container);
  _navigation_tool_bar->setAllowedAreas (Qt::TopToolBarArea);
  _navigation_tool_bar->setMovable (false);

  _current_directory = new QComboBox (_navigation_tool_bar);
  _current_directory->setToolTip (tr ("Enter the path or filename"));
  _current_directory->setEditable (true);
  _current_directory->setMaxCount (MaxMRUDirs);
  _current_directory->setInsertPolicy (QComboBox::NoInsert);
  _current_directory->setSizeAdjustPolicy (
    QComboBox::AdjustToMinimumContentsLengthWithIcon);
  QSizePolicy sizePol (QSizePolicy::Expanding, QSizePolicy::Preferred);
  _current_directory->setSizePolicy (sizePol);

  QAction *directory_up_action = new QAction (resource_manager::icon ("go-up"),
                                              "", _navigation_tool_bar);
  directory_up_action->setToolTip (tr ("One directory up"));

  _sync_browser_directory_action
    = new QAction (resource_manager::icon ("go-first"),
                   tr ("Show Octave directory"), _navigation_tool_bar);
  _sync_browser_directory_action->setToolTip (
    tr ("Go to current Octave directory"));
  _sync_browser_directory_action->setEnabled ("false");

  _sync_octave_directory_action
    = new QAction (resource_manager::icon ("go-last"),
                   tr ("Set Octave directory"), _navigation_tool_bar);
  _sync_octave_directory_action->setToolTip (
    tr ("Set Octave directory to current browser directory"));
  _sync_octave_directory_action->setEnabled ("false");

  QToolButton * popdown_button = new QToolButton ();
  popdown_button->setToolTip (tr ("Actions on current directory"));
  QMenu * popdown_menu = new QMenu ();
  popdown_menu->addAction (resource_manager::icon ("user-home"),
                           tr ("Show Home Directory"),
                           this, SLOT (popdownmenu_home (bool)));
  popdown_menu->addAction (_sync_browser_directory_action);
  popdown_menu->addAction (_sync_octave_directory_action);
  popdown_button->setMenu (popdown_menu);
  popdown_button->setPopupMode (QToolButton::InstantPopup);
  popdown_button->setDefaultAction (new QAction (
                            resource_manager::icon ("applications-system"), "",
                            _navigation_tool_bar));

  popdown_menu->addSeparator ();
  popdown_menu->addAction (resource_manager::icon ("folder"),
                           tr ("Set Browser Directory..."),
                           this, SLOT (popdownmenu_search_dir (bool)));
  popdown_menu->addSeparator ();
  popdown_menu->addAction (resource_manager::icon ("edit-find"),
                           tr ("Find Files..."),
                           this, SLOT (popdownmenu_findfiles (bool)));
  popdown_menu->addSeparator ();
  popdown_menu->addAction (resource_manager::icon ("document-new"),
                           tr ("New File..."),
                           this, SLOT (popdownmenu_newfile (bool)));
  popdown_menu->addAction (resource_manager::icon ("folder-new"),
                           tr ("New Directory..."),
                           this, SLOT (popdownmenu_newdir (bool)));

  _navigation_tool_bar->addWidget (_current_directory);
  _navigation_tool_bar->addAction (directory_up_action);
  _navigation_tool_bar->addWidget (popdown_button);

  connect (directory_up_action, SIGNAL (triggered ()), this,
           SLOT (change_directory_up ()));
  connect (_sync_octave_directory_action, SIGNAL (triggered ()), this,
           SLOT (do_sync_octave_directory ()));
  connect (_sync_browser_directory_action, SIGNAL (triggered ()), this,
           SLOT (do_sync_browser_directory ()));

  QSettings *settings = resource_manager::get_settings ();
  // FIXME: what should happen if settings is 0?

  // Create the QFileSystemModel starting in the desired directory
  QDir startup_dir;  // take current dir

  if (settings->value ("filesdockwidget/restore_last_dir",false).toBool ())
    {
      // restore last dir from previous session
      QStringList last_dirs
        = settings->value ("filesdockwidget/mru_dir_list").toStringList ();
      if (last_dirs.length () > 0)
        startup_dir = QDir (last_dirs.at (0));  // last dir in previous session
    }
  else if (! settings->value ("filesdockwidget/startup_dir").toString ().isEmpty ())
    {
      // do not restore but there is a startup dir configured
      startup_dir
        = QDir (settings->value ("filesdockwidget/startup_dir").toString ());
    }

  if (! startup_dir.exists ())
    {
      // the configured startup dir does not exist, take actual one
      startup_dir = QDir ();
    }

  _file_system_model = new QFileSystemModel (this);
  QModelIndex rootPathIndex = _file_system_model->setRootPath (
                                startup_dir.absolutePath ());

  // Attach the model to the QTreeView and set the root index
  _file_tree_view = new FileTreeViewer (container);
  _file_tree_view->setSelectionMode (QAbstractItemView::ExtendedSelection);
  _file_tree_view->setModel (_file_system_model);
  _file_tree_view->setRootIndex (rootPathIndex);
  _file_tree_view->setSortingEnabled (true);
  _file_tree_view->setAlternatingRowColors (true);
  _file_tree_view->setAnimated (true);
  _file_tree_view->setToolTip (
    tr ("Activate to open in editor, right click for alternatives"));

  // get sort column and order as well as cloumn state (order and width)

  _file_tree_view->sortByColumn (
    settings->value ("filesdockwidget/sort_files_by_column",0).toInt (),
    static_cast<Qt::SortOrder>
    (settings->value ("filesdockwidget/sort_files_by_order",
                      Qt::AscendingOrder).toUInt ())
  );
  _file_tree_view->header ()->restoreState (
    settings->value ("filesdockwidget/column_state").toByteArray ());

  QStringList mru_dirs =
    settings->value ("filesdockwidget/mru_dir_list").toStringList ();
  _current_directory->addItems (mru_dirs);

  _current_directory->setEditText (
    _file_system_model->fileInfo (rootPathIndex).  absoluteFilePath ());

  connect (_file_tree_view, SIGNAL (activated (const QModelIndex &)),
           this, SLOT (item_double_clicked (const QModelIndex &)));

  // add context menu to tree_view
  _file_tree_view->setContextMenuPolicy (Qt::CustomContextMenu);
  connect (_file_tree_view,
           SIGNAL (customContextMenuRequested (const QPoint &)),
           this, SLOT (contextmenu_requested (const QPoint &)));

  _file_tree_view->header()->setContextMenuPolicy (Qt::CustomContextMenu);
  connect (_file_tree_view->header(),
           SIGNAL (customContextMenuRequested (const QPoint &)),
           this, SLOT (headercontextmenu_requested (const QPoint &)));

  // Layout the widgets vertically with the toolbar on top
  QVBoxLayout *vbox_layout = new QVBoxLayout ();
  vbox_layout->setSpacing (0);
  vbox_layout->addWidget (_navigation_tool_bar);
  vbox_layout->addWidget (_file_tree_view);
  vbox_layout->setMargin (1);

  container->setLayout (vbox_layout);

  // FIXME: Add right-click contextual menus for copying, pasting,
  //        deleting files (and others).

  connect (_current_directory->lineEdit (), SIGNAL (returnPressed ()),
           this, SLOT (accept_directory_line_edit ()));

  connect (_current_directory, SIGNAL (activated (const QString &)),
           this, SLOT (set_current_directory (const QString &)));

  connect (this, SIGNAL (run_file_signal (const QFileInfo&)),
           main_win (), SLOT (run_file_in_terminal (const QFileInfo&)));

  QCompleter *completer = new QCompleter (_file_system_model, this);
  _current_directory->setCompleter (completer);

  setFocusProxy (_current_directory);

  _sync_octave_dir = true;   // default, overwirtten with notice_settings ()
  _octave_dir = "";
}

void
files_dock_widget::save_settings (void)
{
  QSettings *settings = resource_manager::get_settings ();

  if (! settings)
    return;

  int sort_column = _file_tree_view->header ()->sortIndicatorSection ();
  Qt::SortOrder sort_order = _file_tree_view->header ()->sortIndicatorOrder ();
  settings->setValue ("filesdockwidget/sort_files_by_column", sort_column);
  settings->setValue ("filesdockwidget/sort_files_by_order", sort_order);
  settings->setValue ("filesdockwidget/column_state",
                      _file_tree_view->header ()->saveState ());

  QStringList dirs;
  for (int i=0; i< _current_directory->count (); i++)
    {
      dirs.append (_current_directory->itemText (i));
    }
  settings->setValue ("filesdockwidget/mru_dir_list", dirs);

  settings->sync ();

  octave_dock_widget::save_settings ();

  if (_sig_mapper)
    delete _sig_mapper;
}

void
files_dock_widget::item_double_clicked (const QModelIndex& index)
{
  // Retrieve the file info associated with the model index.
  QFileInfo fileInfo = _file_system_model->fileInfo (index);
  set_current_directory (fileInfo.absoluteFilePath ());
}

void
files_dock_widget::set_current_directory (const QString& dir)
{
  display_directory (dir);
}

void
files_dock_widget::accept_directory_line_edit (void)
{
  display_directory (_current_directory->currentText ());
}

void
files_dock_widget::change_directory_up (void)
{
  QDir dir
    = QDir (_file_system_model->filePath (_file_tree_view->rootIndex ()));

  dir.cdUp ();
  display_directory (dir.absolutePath ());
}

void
files_dock_widget::do_sync_octave_directory (void)
{
  QDir dir
    = QDir (_file_system_model->filePath (_file_tree_view->rootIndex ()));

  emit displayed_directory_changed (dir.absolutePath ());
}

void
files_dock_widget::do_sync_browser_directory (void)
{
  display_directory (_octave_dir,false);  // false: no sync of octave dir
}

void
files_dock_widget::update_octave_directory (const QString& dir)
{
  _octave_dir = dir;
  if (_sync_octave_dir)
    display_directory (_octave_dir,false);  // false: no sync of octave dir
}

void
files_dock_widget::display_directory (const QString& dir, bool set_octave_dir)
{
  QFileInfo fileInfo (dir);
  if (fileInfo.exists ())
    {
      if (fileInfo.isDir ())
        {
          _file_tree_view->setRootIndex (_file_system_model->
                                         index (fileInfo.absoluteFilePath ()));
          _file_system_model->setRootPath (fileInfo.absoluteFilePath ());
          if (_sync_octave_dir && set_octave_dir)
            process_set_current_dir (fileInfo.absoluteFilePath ());

          // see if its in the list, and if it is,
          // remove it and then, put at top of the list
          int index
            = _current_directory->findText (fileInfo.absoluteFilePath ());
          if (index != -1)
            {
              _current_directory->removeItem (index);
            }
          _current_directory->insertItem (0, fileInfo.absoluteFilePath ());
          _current_directory->setCurrentIndex (0);
        }
      else
        {
          QString abs_fname = fileInfo.absoluteFilePath ();

          QString suffix = fileInfo.suffix ().toLower ();
          QSettings *settings = resource_manager::get_settings ();
          QString ext = settings->value ("filesdockwidget/txt_file_extensions",
                                         "m;c;cc;cpp;h;txt").toString ();
          QStringList extensions = ext.split(";", QString::SkipEmptyParts);

          if (QFile::exists (abs_fname))
            {
              if (is_octave_data_file (abs_fname.toStdString ()))
                emit load_file_signal (abs_fname);
              else if (extensions.contains (suffix))
                emit open_file (fileInfo.absoluteFilePath ());
              else
                open_item_in_app (_file_tree_view->selectionModel ()
                                  ->currentIndex ());
            }
        }
    }
}

void
files_dock_widget::open_item_in_app (const QModelIndex& index)
{
  // Retrieve the file info associated with the model index.
  QFileInfo fileInfo = _file_system_model->fileInfo (index);

  QString file = fileInfo.absoluteFilePath ();

  QDesktopServices::openUrl (QUrl::fromLocalFile (file));
}

void files_dock_widget::toggle_header (int col)
{
  QSettings *settings = resource_manager::get_settings ();

  QString key = _columns_shown_keys.at (col);
  bool shown = settings->value (key,false).toBool ();
  settings->setValue (key, ! shown);
  settings->sync ();

  switch (col)
    {
    case 0:
    case 1:
    case 2:
      // toggle column visibility
      _file_tree_view->setColumnHidden (col + 1, shown);
      break;
    case 3:
    case 4:
      // other actions depending on new settings
      notice_settings (settings);
      break;
    }
}

void
files_dock_widget::headercontextmenu_requested (const QPoint& mpos)
{
  QMenu menu (this);

  if (_sig_mapper)
    delete _sig_mapper;
  _sig_mapper = new QSignalMapper (this);

  QSettings *settings = resource_manager::get_settings ();

  for (int i = 0; i < _columns_shown.size (); i++)
    {
      QAction *action = menu.addAction (_columns_shown.at (i),
                                        _sig_mapper, SLOT (map ()));
      _sig_mapper->setMapping(action, i);
      action->setCheckable (true);
      action->setChecked (
            settings->value (_columns_shown_keys.at (i),true).toBool ());
    }

  connect (_sig_mapper, SIGNAL (mapped (int)),
           this, SLOT (toggle_header (int)));

  menu.exec (_file_tree_view->mapToGlobal (mpos));
}

void
files_dock_widget::contextmenu_requested (const QPoint& mpos)
{

  QMenu menu (this);

  QModelIndex index = _file_tree_view->indexAt (mpos);

  if (index.isValid ())
    {
      QFileInfo info = _file_system_model->fileInfo (index);

      QItemSelectionModel *m = _file_tree_view->selectionModel ();
      QModelIndexList sel = m->selectedRows ();

      // check if item at mouse position is seleccted
      if (! sel.contains (index))
        {
          // is not selected -> clear actual selection and select this item
          m->setCurrentIndex(index,
                             QItemSelectionModel::Clear
                             | QItemSelectionModel::Select
                             | QItemSelectionModel::Rows);
        }

      // construct the context menu depending on item
      menu.addAction (resource_manager::icon ("document-open"), tr ("Open"),
                      this, SLOT (contextmenu_open (bool)));

      if (info.isDir ())
        {
          menu.addAction (tr ("Open in System File Explorer"),
                          this, SLOT (contextmenu_open_in_app (bool)));
        }

      if (info.isFile ())
        menu.addAction (tr ("Open in Text Editor"),
                        this, SLOT (contextmenu_open_in_editor (bool)));

      menu.addAction (tr ("Copy Selection to Clipboard"),
                      this, SLOT (contextmenu_copy_selection (bool)));

      if (info.isFile () && info.suffix () == "m")
        menu.addAction (resource_manager::icon ("media-playback-start"),
                        tr ("Run"), this, SLOT (contextmenu_run (bool)));

      if (info.isFile ())
        menu.addAction (tr ("Load Data"), this, SLOT (contextmenu_load (bool)));

      if (info.isDir ())
        {
          menu.addSeparator ();
          menu.addAction (resource_manager::icon ("go-first"),
                          tr ("Set Current Directory"),
                          this, SLOT (contextmenu_setcurrentdir (bool)));
          menu.addSeparator ();
          menu.addAction (resource_manager::icon ("edit-find"),
                          tr ("Find Files..."), this,
                          SLOT (contextmenu_findfiles (bool)));
        }

      menu.addSeparator ();
      menu.addAction (tr ("Rename..."), this, SLOT (contextmenu_rename (bool)));
      menu.addAction (resource_manager::icon ("edit-delete"),
                      tr ("Delete..."), this, SLOT (contextmenu_delete (bool)));

      if (info.isDir ())
        {
          menu.addSeparator ();
          menu.addAction (resource_manager::icon ("document-new"),
                          tr ("New File..."),
                          this, SLOT (contextmenu_newfile (bool)));
          menu.addAction (resource_manager::icon ("folder-new"),
                          tr ("New Directory..."),
                          this, SLOT (contextmenu_newdir (bool)));
        }

      // show the menu
      menu.exec (_file_tree_view->mapToGlobal (mpos));

    }
}

void
files_dock_widget::contextmenu_open (bool)
{

  QItemSelectionModel *m = _file_tree_view->selectionModel ();
  QModelIndexList rows = m->selectedRows ();

  for (QModelIndexList::iterator it = rows.begin (); it != rows.end (); it++)
    {
      QFileInfo file = _file_system_model->fileInfo (*it);
      if (file.exists ())
        display_directory (file.absoluteFilePath ());
    }
}

void
files_dock_widget::contextmenu_open_in_editor (bool)
{

  QItemSelectionModel *m = _file_tree_view->selectionModel ();
  QModelIndexList rows = m->selectedRows ();

  for (QModelIndexList::iterator it = rows.begin (); it != rows.end (); it++)
    {
      QFileInfo file = _file_system_model->fileInfo (*it);
      if (file.exists ())
        emit open_file (file.absoluteFilePath ());
    }
}

void
files_dock_widget::contextmenu_open_in_app (bool)
{
  QItemSelectionModel *m = _file_tree_view->selectionModel ();
  QModelIndexList rows = m->selectedRows ();

  for (QModelIndexList::iterator it = rows.begin (); it != rows.end (); it++)
    open_item_in_app (*it);
}

void
files_dock_widget::contextmenu_copy_selection (bool)
{
  QItemSelectionModel *m = _file_tree_view->selectionModel ();
  QModelIndexList rows = m->selectedRows ();

  QStringList selection;

  for (QModelIndexList::iterator it = rows.begin (); it != rows.end (); it++)
    {
      QFileInfo info = _file_system_model->fileInfo (*it);

      selection << info.fileName ();
    }

  QClipboard *clipboard = QApplication::clipboard ();

  clipboard->setText (selection.join ("\n"));
}

void
files_dock_widget::contextmenu_load (bool)
{
  QItemSelectionModel *m = _file_tree_view->selectionModel ();
  QModelIndexList rows = m->selectedRows ();

  if (rows.size () > 0)
    {
      QModelIndex index = rows[0];

      QFileInfo info = _file_system_model->fileInfo (index);

      emit load_file_signal (info.fileName ());
    }
}

void
files_dock_widget::contextmenu_run (bool)
{
  QItemSelectionModel *m = _file_tree_view->selectionModel ();
  QModelIndexList rows = m->selectedRows ();

  if (rows.size () > 0)
    {
      QModelIndex index = rows[0];

      QFileInfo info = _file_system_model->fileInfo (index);
      emit run_file_signal (info);
    }
}

void
files_dock_widget::contextmenu_rename (bool)
{
  QItemSelectionModel *m = _file_tree_view->selectionModel ();
  QModelIndexList rows = m->selectedRows ();
  if (rows.size () > 0)
    {
      QModelIndex index = rows[0];

      QFileInfo info = _file_system_model->fileInfo (index);
      QDir path = info.absoluteDir ();
      QString old_name = info.fileName ();
      bool ok;

      QString new_name
        = QInputDialog::getText (this, tr ("Rename file/directory"),
                                 tr ("Rename file/directory:\n")
                                 + old_name + tr ("\n to: "),
                                 QLineEdit::Normal, old_name, &ok);
      if (ok && new_name.length () > 0)
        {
          new_name = path.absolutePath () + "/" + new_name;
          old_name = path.absolutePath () + "/" + old_name;
          path.rename (old_name, new_name);
          _file_system_model->revert ();
        }
    }

}

void
files_dock_widget::contextmenu_delete (bool)
{
  QItemSelectionModel *m = _file_tree_view->selectionModel ();
  QModelIndexList rows = m->selectedRows ();

  for (QModelIndexList::iterator it = rows.begin (); it != rows.end (); it++)
    {
      QModelIndex index = *it;

      QFileInfo info = _file_system_model->fileInfo (index);

      if (QMessageBox::question (this, tr ("Delete file/directory"),
                                 tr ("Are you sure you want to delete\n")
                                 + info.filePath (),
                                 QMessageBox::Yes | QMessageBox::No)
          == QMessageBox::Yes)
        {
          if (info.isDir ())
            {
              // see if direcory is empty
              QDir path (info.absoluteFilePath ());
              QList<QFileInfo> fileLst = path.entryInfoList (QDir::AllEntries |
                                         QDir::NoDotAndDotDot);

              if (fileLst.count () != 0)
                QMessageBox::warning (this, tr ("Delete file/directory"),
                                      tr ("Can not delete a directory that is not empty"));
              else
                _file_system_model->rmdir (index);
            }
          else
            {
              _file_system_model->remove (index);
            }

          _file_system_model->revert ();

        }
    }
}

void
files_dock_widget::contextmenu_newfile (bool)
{
  QItemSelectionModel *m = _file_tree_view->selectionModel ();
  QModelIndexList rows = m->selectedRows ();

  if (rows.size () > 0)
    {
      QModelIndex index = rows[0];

      QFileInfo info = _file_system_model->fileInfo (index);
      QString parent_dir = info.filePath ();

      process_new_file (parent_dir);
    }
}

void
files_dock_widget::contextmenu_newdir (bool)
{
  QItemSelectionModel *m = _file_tree_view->selectionModel ();
  QModelIndexList rows = m->selectedRows ();

  if (rows.size () > 0)
    {
      QModelIndex index = rows[0];

      QFileInfo info = _file_system_model->fileInfo (index);
      QString parent_dir = info.filePath ();

      process_new_dir (parent_dir);
    }
}

void
files_dock_widget::contextmenu_setcurrentdir (bool)
{
  QItemSelectionModel *m = _file_tree_view->selectionModel ();
  QModelIndexList rows = m->selectedRows ();

  if (rows.size () > 0)
    {
      QModelIndex index = rows[0];

      QFileInfo info = _file_system_model->fileInfo (index);

      if (info.isDir ())
        {
          process_set_current_dir (info.absoluteFilePath ());
        }
    }
}

void
files_dock_widget::contextmenu_findfiles (bool)
{
  QItemSelectionModel *m = _file_tree_view->selectionModel ();
  QModelIndexList rows = m->selectedRows ();

  if (rows.size () > 0)
    {
      QModelIndex index = rows[0];

      QFileInfo info = _file_system_model->fileInfo (index);

      if (info.isDir ())
        {
          process_find_files (info.absoluteFilePath ());
        }
    }
}

void
files_dock_widget::notice_settings (const QSettings *settings)
{
  // Qsettings pointer is checked before emitting.

  int icon_size_settings = settings->value ("toolbar_icon_size",0).toInt ();
  QStyle *st = style ();
  int icon_size = st->pixelMetric (QStyle::PM_ToolBarIconSize);

  if (icon_size_settings == 1)
    icon_size = st->pixelMetric (QStyle::PM_LargeIconSize);
  else if (icon_size_settings == -1)
    icon_size = st->pixelMetric (QStyle::PM_SmallIconSize);

  _navigation_tool_bar->setIconSize (QSize (icon_size,icon_size));

  // filenames are always shown, other columns can be hidden by settings
  for (int i = 0; i < 3; i++)
    _file_tree_view->setColumnHidden (i + 1,
        ! settings->value (_columns_shown_keys.at (i),false).toBool ());

  if (settings->value (_columns_shown_keys.at (3),false).toBool ())
    _file_system_model->setFilter (QDir::NoDotAndDotDot | QDir::AllEntries
                                   | QDir::Hidden);
  else
    _file_system_model->setFilter (QDir::NoDotAndDotDot | QDir::AllEntries);

  _file_tree_view->setAlternatingRowColors (
    settings->value (_columns_shown_keys.at (4),true).toBool ());
  _file_tree_view->setModel (_file_system_model);

  // enable the buttons to sync octave/browser dir
  // only if this is not done by default
  _sync_octave_dir
    = settings->value ("filesdockwidget/sync_octave_directory",false).toBool ();
  _sync_octave_directory_action->setEnabled (! _sync_octave_dir);
  _sync_browser_directory_action->setEnabled (! _sync_octave_dir);

  if (_sync_octave_dir)
    display_directory (_octave_dir);  // sync browser to octave dir

}

void
files_dock_widget::popdownmenu_home (bool)
{
  QString dir
    = QString::fromStdString (octave::sys::env::get_home_directory ());

  if (dir.isEmpty ())
    dir = QDir::homePath ();

  set_current_directory (dir);
}

void
files_dock_widget::popdownmenu_search_dir (bool)
{
  QString dir = QFileDialog::getExistingDirectory
                  (this, tr ("Set directory of file browser"),
                   _file_system_model->rootPath (),
                   QFileDialog::ShowDirsOnly
                   | QFileDialog::DontUseNativeDialog);
  set_current_directory (dir);
}

void
files_dock_widget::popdownmenu_findfiles (bool)
{
  process_find_files (_file_system_model->rootPath ());
}

void
files_dock_widget::popdownmenu_newdir (bool)
{
  process_new_dir (_file_system_model->rootPath ());
}

void
files_dock_widget::popdownmenu_newfile (bool)
{
  process_new_file (_file_system_model->rootPath ());
}

void
files_dock_widget::process_new_file (const QString &parent_dir)
{
  bool ok;

  QString name = QInputDialog::getText (this, tr ("Create File"),
       tr ("Create file in\n","String ends with \\n!") + parent_dir,
       QLineEdit::Normal, tr ("New File.txt"), &ok);
  if (ok && name.length () > 0)
    {
      name = parent_dir + "/" + name;

      QFile file (name);
      file.open (QIODevice::WriteOnly);
      _file_system_model->revert ();
    }
}

void
files_dock_widget::process_new_dir (const QString &parent_dir)
{
  bool ok;

  QString name = QInputDialog::getText (this, tr ("Create Directory"),
                tr ("Create folder in\n","String ends with \\n!") + parent_dir,
                QLineEdit::Normal, tr ("New Directory"), &ok);
  if (ok && name.length () > 0)
    {
      QDir dir (parent_dir);
      dir.mkdir (name);
      _file_system_model->revert ();
    }
}

void files_dock_widget::process_set_current_dir (const QString & dir)
{
  emit displayed_directory_changed (dir);
}

void files_dock_widget::process_find_files (const QString & dir)
{
  emit find_files_signal (dir);
}

void
files_dock_widget::copyClipboard ()
{
  if (_file_tree_view->hasFocus ())
    contextmenu_copy_selection (true);
  if (_current_directory->hasFocus ())
    {
      QClipboard *clipboard = QApplication::clipboard ();

      QLineEdit * edit = _current_directory->lineEdit ();
      if (edit && edit->hasSelectedText ())
        {
          clipboard->setText (edit->selectedText ());
        }
    }
}

void
files_dock_widget::pasteClipboard ()
{
  if (_current_directory->hasFocus ())
    {
      QClipboard *clipboard = QApplication::clipboard ();
      QString str = clipboard->text ();
      QLineEdit * edit = _current_directory->lineEdit ();
      if (edit && str.length () > 0)
        edit->insert (str);
    }
}

void
files_dock_widget::selectAll ()
{
  if (_file_tree_view->hasFocus ())
    _file_tree_view->selectAll ();
  if (_current_directory->hasFocus ())
    {
      QLineEdit * edit = _current_directory->lineEdit ();
      if (edit)
        {
          edit->selectAll ();
        }
    }
}



