calibre/libprs500/gui/main.py

##    Copyright (C) 2006 Kovid Goyal kovid@kovidgoyal.net
##    This program 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 2 of the License, or
##    (at your option) any later version.
##
##    This program 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 this program; if not, write to the Free Software Foundation, Inc.,
##    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
from libprs500.communicate import PRS500Device as device
from libprs500.errors import *
from libprs500.lrf.meta import LRFMetaFile, LRFException
from database import LibraryDatabase
from editbook import EditBookDialog

from PyQt4.QtCore import Qt, SIGNAL
from PyQt4.Qt import QObject, QThread, QCoreApplication, QEventLoop, QString, QStandardItem, QStandardItemModel, QStatusBar, QVariant, QAbstractTableModel, \
                                   QAbstractItemView, QImage, QPixmap, QIcon, QSize, QMessageBox, QSettings, QFileDialog, QErrorMessage, QDialog
from PyQt4 import uic
import sys, pkg_resources, re, string, time, os, os.path, traceback, textwrap, zlib
from stat import ST_SIZE
from tempfile import TemporaryFile, NamedTemporaryFile
from exceptions import Exception as Exception
import xml.dom.minidom as dom
from xml.dom.ext import PrettyPrint as PrettyPrint
from operator import itemgetter

DEFAULT_BOOK_COVER = None
NONE = QVariant()
TIME_WRITE_FMT  = "%d %b %Y"
COVER_HEIGHT = 80

def human_readable(size):
  """ Convert a size in bytes into a human readable form """
  if size < 1024: divisor, suffix = 1, "B"
  elif size < 1024*1024: divisor, suffix = 1024., "KB"
  elif size < 1024*1024*1024: divisor, suffix = 1024*1024, "MB"
  elif size < 1024*1024*1024*1024: divisor, suffix = 1024*1024, "GB"
  size = str(size/divisor)
  if size.find(".") > -1: size = size[:size.find(".")+2]
  return size + " " + suffix


def wrap(s, width=20):
  return textwrap.fill(str(s), width) 

class LibraryBooksModel(QAbstractTableModel):
  FIELDS = ["id", "title", "authors", "size", "date", "publisher", "tags"]
  TIME_READ_FMT = "%Y-%m-%d %H:%M:%S"
  def __init__(self, parent):
    QAbstractTableModel.__init__(self, parent)
    self.db    = None 
    self._data = None
    self._orig_data = None
    self.image_file = None
    
  def rowCount(self, parent): return len(self._data)
  def columnCount(self, parent): return len(self.FIELDS)-2
    
  def set_data(self, db):
    self.emit(SIGNAL("layoutAboutToBeChanged()"))
    self.db    = db
    self._data = self.db.get_table(self.FIELDS)    
    self._orig_data = self._data
    self.sort(0, Qt.DescendingOrder)
    
  def headerData(self, section, orientation, role):    
    if role != Qt.DisplayRole:
      return NONE
    text = ""
    if orientation == Qt.Horizontal:      
      if   section == 0: text = "Title"
      elif section == 1: text = "Author(s)"
      elif section == 2: text = "Size"
      elif section == 3: text = "Date"
      elif section == 4: text = "Publisher"
      return QVariant(self.trUtf8(text))
    else: return QVariant(str(1+section))
    
  def info(self, row):
    row = self._data[row]
    cover = self.db.get_cover(row["id"])
    exts = ",".join(self.db.get_extensions(row["id"]))    
    if not cover: 
      cover = DEFAULT_BOOK_COVER
      self.image_file = None
    else:
      pix = QPixmap()
      self.image_file = NamedTemporaryFile()
      self.image_file.write(cover)
      self.image_file.flush()
      pix.loadFromData(cover, "", Qt.AutoColor)
      cover = pix.scaledToHeight(COVER_HEIGHT, Qt.SmoothTransformation)
    return row["title"], row["authors"], human_readable(int(row["size"])), exts, cover
  
  def id_from_index(self, index): return self._data[index.row()]["id"]
  
  def refresh_row(self, row):
    self._data[row] = self.db.get_row_by_id(self._data[row]["id"], self.FIELDS)
    self.emit(SIGNAL("dataChanged(QModelIndex, QModelIndex)"), self.index(row, 0), self.index(row, self.columnCount(0)-1))
  
  def data(self, index, role):
    if role == Qt.DisplayRole:      
      row, col = index.row(), index.column()
      text = None
      row = self._data[row]
      if   col == 0: text = wrap(row["title"], width=25)
      elif col == 1: 
        au = row["authors"]
        if au : text = wrap(re.sub("&", "\n", au), width=25)
      elif col == 2: text = human_readable(row["size"])
      elif col == 3: text = time.strftime(TIME_WRITE_FMT, time.strptime(row["date"], self.TIME_READ_FMT))
      elif col == 4: 
        pub = row["publisher"]
        if pub: text = wrap(pub, 20)
      if not text: text = "Unknown"
      return QVariant(text)
    elif role == Qt.TextAlignmentRole and index.column() in [2,3,4]:
      return QVariant(Qt.AlignRight)
    return NONE
      
  def sort(self, col, order):
    descending = order != Qt.AscendingOrder
    def getter(key, func):  return lambda x : func(itemgetter(key)(x))
    if col == 0: key, func = "title", string.lower
    if col == 1: key, func = "authors", lambda x : x.split()[-1:][0].lower() if x else ""
    if col == 2: key, func = "size", int
    if col == 3: key, func = "date", lambda x: time.mktime(time.strptime(x, self.TIME_READ_FMT))
    if col == 4: key, func = "publisher", lambda x : x.lower() if x else ""
    self.emit(SIGNAL("layoutAboutToBeChanged()"))
    self._data.sort(key=getter(key, func))
    if descending: self._data.reverse()
    self.emit(SIGNAL("layoutChanged()"))
    self.emit(SIGNAL("sorted()"))
  
  def search(self, query):
    def query_in(book, q):
      au = book["authors"]
      if not au : au = "unknown"
      pub = book["publisher"]
      if not pub : pub = "unknown"
      return q in book["title"].lower() or q in au.lower() or q in pub.lower()
    queries = unicode(query, 'utf-8').lower().split()
    self.emit(SIGNAL("layoutAboutToBeChanged()"))
    self._data = []
    for book in self._orig_data:
      match = True
      for q in queries:
        if query_in(book, q) : continue
        else:
          match = False
          break
      if match: self._data.append(book)
    self.emit(SIGNAL("layoutChanged()"))
    self.emit(SIGNAL("searched()"))

class DeviceBooksModel(QAbstractTableModel):
  TIME_READ_FMT  = "%a, %d %b %Y %H:%M:%S %Z"  
  def __init__(self, parent, data):
    QAbstractTableModel.__init__(self, parent)
    self._data = data
    self._orig_data = data
    self.image_file = None
  
  def set_data(self, data):
    self.emit(SIGNAL("layoutAboutToBeChanged()"))
    self._data = data
    self._orig_data = data
    self.sort(0, Qt.DescendingOrder)
    
  def rowCount(self, parent): return len(self._data)
  def columnCount(self, parent): return 4
  
  def headerData(self, section, orientation, role):
    if role != Qt.DisplayRole:
      return NONE
    text = ""
    if orientation == Qt.Horizontal:      
      if section == 0: text = "Title"
      elif section == 1: text = "Author(s)"
      elif section == 2: text = "Size"
      elif section == 3: text = "Date"
      return QVariant(self.trUtf8(text))
    else: return QVariant(str(1+section))
    
  def data(self, index, role):
    if role == Qt.DisplayRole:
      row, col = index.row(), index.column()
      book = self._data[row]
      if col == 0: text = book["title"]
      elif col == 1: text = book["author"]
      elif col == 2: text = human_readable(int(book["size"]))
      elif col == 3: text = time.strftime(TIME_WRITE_FMT, time.strptime(book["date"], self.TIME_READ_FMT))
      return QVariant(text)
    elif role == Qt.TextAlignmentRole and index.column() in [2,3]:
      return QVariant(Qt.AlignRight)
    return NONE
    
  def info(self, row):
    row = self._data[row]    
    try:
      cover = row["thumbnail"]
      pix = QPixmap()
      self.image_file = NamedTemporaryFile()
      self.image_file.write(cover)
      self.image_file.flush()
      pix.loadFromData(cover, "", Qt.AutoColor)
      cover = pix.scaledToHeight(COVER_HEIGHT, Qt.SmoothTransformation)      
    except Exception, e: 
      self.image_file = None
      cover = DEFAULT_BOOK_COVER
    return row["title"], row["author"], human_readable(int(row["size"])), row["mime"], cover
  
  def sort(self, col, order):
    def getter(key, func):  return lambda x : func(itemgetter(key)(x))
    if col == 0: key, func = "title", string.lower
    if col == 1: key, func = "author", lambda x : x.split()[-1:][0].lower()
    if col == 2: key, func = "size", int
    if col == 3: key, func = "date", lambda x: time.mktime(time.strptime(x, self.TIME_READ_FMT))
    descending = order != Qt.AscendingOrder
    self.emit(SIGNAL("layoutAboutToBeChanged()"))
    self._data.sort(key=getter(key, func))
    if descending: self._data.reverse()
    self.emit(SIGNAL("layoutChanged()"))
    self.emit(SIGNAL("sorted()"))

  def search(self, query):
    queries = unicode(query, 'utf-8').lower().split()
    self.emit(SIGNAL("layoutAboutToBeChanged()"))
    self._data = []
    for book in self._orig_data:
      match = True
      for q in queries:
        if q in book["title"].lower() or q in book["author"].lower(): continue
        else:
          match = False
          break
      if match: self._data.append(book)
    self.emit(SIGNAL("layoutChanged()"))
    self.emit(SIGNAL("searched()"))
    
  def delete_by_path(self, path):
    self.emit(SIGNAL("layoutAboutToBeChanged()"))
    index = -1
    for book in self._data:
      if path in book["path"]:
        self._data.remove(book)
        break
    for book in self._orig_data:
      if path in book["path"]:
        self._orig_data.remove(book)
        break
    self.emit(SIGNAL("layoutChanged()"))
    self.emit(SIGNAL("deleted()"))
    
  def path(self, index):  return self._data[index.row()]["path"]
  def title(self, index):  return self._data[index.row()]["title"]
    
    


ui = pkg_resources.resource_stream(__name__, "main.ui")
sys.path.append(os.path.dirname(ui.name))
Ui_MainWindow, bclass = uic.loadUiType(pkg_resources.resource_stream(__name__,  "main.ui"))
class MainWindow(QObject, Ui_MainWindow): 
  
  def show_device(self, yes):
    """ If C{yes} show the items on the device otherwise show the items in the library """
    self.device_view.clearSelection(), self.library_view.clearSelection()
    self.book_cover.hide(), self.book_info.hide()
    if yes: 
      self.device_view.show(), self.library_view.hide()
      self.current_view = self.device_view
    else: 
      self.device_view.hide(), self.library_view.show()
      self.current_view = self.device_view
      
  
  def tree_clicked(self, index):
    show_device = self.show_device
    item = self.tree.itemFromIndex(index)
    text = str(item.text())
    if text == "Library":
      show_device(False)
    elif text == "SONY Reader":
      show_device(True)
      self.set_device_data(self.main_books + self.card_books)
    elif text == "Main Memory":
      show_device(True)
      self.set_device_data(self.main_books)
    elif text == "Storage Card":
      show_device(True)
      self.set_device_data(self.card_books)
    elif text == "Books":
      text = str(item.parent().text())
      if text == "Library":
        show_device(False)        
      elif text == "Main Memory":
        show_device(True)
        self.set_device_data(self.main_books)  
      elif text == "Storage Card":
        show_device(True)
        self.set_data(self.card_books)
  
  def set_device_data(self, data): 
    self.device_model.set_data(data) 
    self.device_view.resizeColumnsToContents()
  
  def model_modified(self):
    self.device_view.clearSelection()
    self.library_view.clearSelection()
    self.book_cover.hide()
    self.book_info.hide()
    QCoreApplication.processEvents(QEventLoop.ExcludeUserInputEvents)    
  
  def show_book(self, current, previous):
    title, author, size, mime, thumbnail = current.model().info(current.row())
    self.book_info.setText(self.BOOK_TEMPLATE.arg(title).arg(size).arg(author).arg(mime))
    self.book_cover.setPixmap(thumbnail)
    try:
      name = os.path.abspath(current.model().image_file.name)
      self.book_cover.setToolTip('<img src="'+name+'">')
    except Exception, e: self.book_cover.setToolTip('<img src=":/default_cover">')
    self.book_cover.show()
    self.book_info.show()
  
  
  def list_context_event(self, event):
    print "TODO:"
  
  def do_delete(self, rows):
    if self.device_model.__class__.__name__ == "DeviceBooksdevice_model":
      paths, mc, cc = [], False, False
      for book in rows:
        path = book.model().path(book)
        if path[0] == "/": file, prefix, mc = self.main_xml, "xs1:", True
        else:                    file, prefix, cc = self.cache_xml, "",       True
        file.seek(0)
        document = dom.parse(file)
        books = document.getElementsByTagName(prefix + "text")
        for candidate in books:
          if candidate.attributes["path"].value in path:
            paths.append(path)
            candidate.parentNode.removeChild(candidate)
            break
        file.close()
        file = TemporaryFile()
        PrettyPrint(document, file)        
        if len(prefix) > 0: self.main_xml = file
        else: self.cache_xml = file
      for path in paths:
        self.dev.del_file(path)
        self.device_model.delete_by_path(path)        
      self.cache_xml.seek(0)
      self.main_xml.seek(0)
      self.status("Files deleted. Updating media list on device")
      if mc: 
        self.dev.del_file(self.dev.MEDIA_XML)
        self.dev.put_file(self.main_xml, self.dev.MEDIA_XML)
      if cc: 
        self.dev.del_file(self.card+self.dev.CACHE_XML)
        self.dev.put_file(self.cache_xml, self.card+self.dev.CACHE_XML)
  
  def delete(self, action):
    self.window.setCursor(Qt.WaitCursor)
    rows   = self.device_view.selectionModel().selectedRows()
    items = [ row.model().title(row) + ": " +  row.model().path(row)[row.model().path(row).rfind("/")+1:] for row in rows ]
    ret = QMessageBox.question(self.window, self.trUtf8("SONY Reader - confirm"),  self.trUtf8("Are you sure you want to delete these items from the device?\n\n") + "\n".join(items), 
             QMessageBox.YesToAll | QMessageBox.No, QMessageBox.YesToAll)
    if ret == QMessageBox.YesToAll:
      self.do_delete(rows)
    self.window.setCursor(Qt.ArrowCursor)
  
  def read_settings(self):
    settings = QSettings()
    settings.beginGroup("MainWindow")
    self.window.resize(settings.value("size", QVariant(QSize(1000, 700))).toSize())
    settings.endGroup()
    self.database_path = settings.value("database path", QVariant(os.path.expanduser("~/library.db"))).toString()
    
  def write_settings(self):
    settings = QSettings()
    settings.beginGroup("MainWindow")
    settings.setValue("size", QVariant(self.window.size()))
    settings.endGroup()
  
  def close_event(self, e):
    self.write_settings()
    e.accept()
  
  def add(self, action):
    settings = QSettings()
    dir = settings.value("add books dialog dir", QVariant(os.path.expanduser("~"))).toString()
    files = QFileDialog.getOpenFileNames(self.window, "Choose books to add to library", dir, "Books (*.lrf *.lrx *.rtf *.pdf *.txt);;All files (*)")
    if not files.isEmpty():
      x = str(files[0])
      settings.setValue("add books dialog dir", QVariant(os.path.dirname(x)))
      files = str(files.join("|||")).split("|||")      
      for file in files:
        file = os.path.abspath(file)
        title, author, cover, publisher = None, None, None, None
        if ext == "lrf":
          try: 
            lrf = LRFMetaFile(open(file, "r+b"))
            title = lrf.title
            author = lrf.author
            publisher = lrf.publisher
            cover = lrf.thumbnail
            if "unknown" in author.lower(): author = None
          except IOError, e:
            self.show_error(e, "Unable to access <b>"+file+"</b>")
            return
          except LRFException: pass
          self.library_model.add(file, title, author, publisher, cover)
      
  def edit(self, action):
    if self.library_view.isVisible():
      rows = self.library_view.selectionModel().selectedRows()
      for row in rows:
        id = self.library_model.id_from_index(row)
        dialog = QDialog(self.window)
        ed = EditBookDialog(dialog, id, self.library_model.db)
        if dialog.exec_() == QDialog.Accepted:
          self.library_model.refresh_row(row.row())
          
  
  def show_error(self, e, msg): 
    QErrorMessage(self.window).showMessage(msg+"<br><b>Error: </b>"+str(e)+"<br><br>Traceback:<br>"+traceback.format_exc(e))
  
  def __init__(self, window):
    QObject.__init__(self)
    Ui_MainWindow.__init__(self)
  
    self.dev = device(report_progress=self.progress)
    self.is_connected = False    
    self.setupUi(window)
    self.card = None
    self.window = window
    window.closeEvent = self.close_event
    self.read_settings()
    
    # Setup Library Book list
    self.library_model = LibraryBooksModel(window)
    self.library_model.set_data(LibraryDatabase(str(self.database_path)))
    self.library_view.setModel(self.library_model)
    self.current_view = self.library_view
    self.library_view.setSelectionBehavior(QAbstractItemView.SelectRows)
    self.library_view.setSortingEnabled(True)
    self.library_view.contextMenuEvent = self.list_context_event
    QObject.connect(self.library_model, SIGNAL("layoutChanged()"), self.library_view.resizeRowsToContents)
    QObject.connect(self.library_view.selectionModel(), SIGNAL("currentChanged(QModelIndex, QModelIndex)"), self.show_book)
    QObject.connect(self.search, SIGNAL("textChanged(QString)"), self.library_model.search)
    QObject.connect(self.library_model, SIGNAL("sorted()"), self.model_modified)
    QObject.connect(self.library_model, SIGNAL("searched()"), self.model_modified)
    QObject.connect(self.library_model, SIGNAL("deleted()"), self.model_modified)    
    self.library_view.resizeColumnsToContents()
    
    
    # Create Device list
    self.tree = QStandardItemModel()
    library = QStandardItem(QString("Library"))
    library.setIcon(QIcon(":/library"))
    font = library.font()
    font.setBold(True)    
    self.tree.appendRow(library)
    library.setFont(font)
    library.appendRow(QStandardItem(QString("Books")))
    blank = QStandardItem(" ")
    blank.setEnabled(False)
    self.tree.appendRow(blank)
    self.reader = QStandardItem(QString("SONY Reader"))    
    mm = QStandardItem(QString("Main Memory"))
    mm.appendRow(QStandardItem(QString("Books")))
    self.reader.appendRow(mm)
    mc = QStandardItem(QString("Storage Card"))
    mc.appendRow(QStandardItem(QString("Books")))
    self.reader.appendRow(mc)
    self.reader.setIcon(QIcon(":/reader"))
    self.tree.appendRow(self.reader)
    self.reader.setFont(font)
    self.treeView.setModel(self.tree)    
    self.treeView.header().hide()
    self.treeView.setExpanded(library.index(), True)
    self.treeView.setExpanded(self.reader.index(), True)
    self.treeView.setExpanded(mm.index(), True)
    self.treeView.setExpanded(mc.index(), True)
    self.treeView.setRowHidden(2, self.tree.invisibleRootItem().index(), True)
    QObject.connect(self.treeView, SIGNAL("activated(QModelIndex)"),  self.tree_clicked)
    QObject.connect(self.treeView, SIGNAL("clicked(QModelIndex)"),  self.tree_clicked)
    
    # Create Device Book list
    self.device_model = DeviceBooksModel(window, [])    
    self.device_view.setModel(self.device_model)
    self.device_view.setSelectionBehavior(QAbstractItemView.SelectRows)
    self.device_view.setSortingEnabled(True)
    self.device_view.contextMenuEvent = self.list_context_event
    QObject.connect(self.device_model, SIGNAL("layoutChanged()"), self.device_view.resizeRowsToContents)
    QObject.connect(self.device_view.selectionModel(), SIGNAL("currentChanged(QModelIndex, QModelIndex)"), self.show_book)
    QObject.connect(self.search, SIGNAL("textChanged(QString)"), self.device_model.search)
    QObject.connect(self.device_model, SIGNAL("sorted()"), self.model_modified)
    QObject.connect(self.device_model, SIGNAL("searched()"), self.model_modified)
    QObject.connect(self.device_model, SIGNAL("deleted()"), self.model_modified)
    self.device_view.hide()
    
    # Setup book display
    self.BOOK_TEMPLATE = self.book_info.text()    
    self.BOOK_IMAGE       = DEFAULT_BOOK_COVER
    self.book_cover.hide()
    self.book_info.hide()
    
    # Connect actions
    QObject.connect(self.action_add, SIGNAL("triggered(bool)"), self.add)
    QObject.connect(self.action_del, SIGNAL("triggered(bool)"), self.delete)
    QObject.connect(self.action_edit, SIGNAL("triggered(bool)"), self.edit)
    
    self.device_detector = self.startTimer(1000)
    self.splitter.setStretchFactor(0,0)
    self.splitter.setStretchFactor(1,100)
    self.search.setFocus(Qt.OtherFocusReason)
    window.show()
    
  def timerEvent(self, e):
    if e.timerId() == self.device_detector:
      is_connected = self.dev.is_connected()
      if is_connected and not self.is_connected:
        self.establish_connection()
      elif not is_connected and self.is_connected:
        self.device_removed()
  
  def device_removed(self, timeout=False):
    """ @todo: only reset stuff if library is not shown """
    self.is_connected = False
    self.df.setText("Main memory: <br><br>Storage card:")
    self.card = None
    self.treeView.setRowHidden(2, self.tree.invisibleRootItem().index(), True)
    self.device_model.set_data([])
    self.book_cover.hide()
    self.book_info.hide()
    self.device_view.hide()
    
  
  def timeout_error(self):
    """ @todo: display error dialog """
    pass
  
  def progress(self, val):
    if val < 0:
      self.progress_bar.setMaximum(0)
    else: self.progress_bar.setValue(val)
    QCoreApplication.processEvents(QEventLoop.ExcludeUserInputEvents)
  
  def status(self, msg):
    self.progress_bar.setMaximum(100)
    self.progress_bar.reset()
    self.progress_bar.setFormat(msg + ": %p%")
    QCoreApplication.processEvents(QEventLoop.ExcludeUserInputEvents)
  
  def establish_connection(self):
    self.window.setCursor(Qt.WaitCursor)
    self.status("Connecting to device")    
    try:
      space = self.dev.available_space()
    except ProtocolError:
      c = 0
      self.status("Waiting for device to initialize")
      while c < 100: # Delay for 10s while device is initializing
        if c % 10 == c/10:
          self.progress(c)
        QThread.currentThread().msleep(100)
        c += 1   
      space = self.dev.available_space()    
    sc = space[1][1] if space[1][1] else space[2][1]
    self.df.setText("Main memory:  " + human_readable(space[0][1]) + "<br><br>Storage card: " + human_readable(sc))
    self.is_connected = True
    if space[1][2] > 0: self.card = "a:"
    elif space[2][2] > 0: self.card = "b:"
    else: self.card = None
    if self.card: self.treeView.setRowHidden(1, self.reader.index(), False)
    else: self.treeView.setRowHidden(1, self.reader.index(), True)
    self.treeView.setRowHidden(2, self.tree.invisibleRootItem().index(), False)
    self.status("Loading media list from device")
    mb, cb, mx, cx = self.dev.books()    
    
    for x in (mb, cb):
      for book in x:
        if "&" in book["author"]:
          book["author"] = re.sub(r"&\s*", r"\n", book["author"])
          
    self.main_books = mb
    self.card_books = cb
    self.main_xml = mx
    self.cache_xml = cx
    self.window.setCursor(Qt.ArrowCursor)
    
def main():
    from PyQt4.Qt import QApplication, QMainWindow
    app = QApplication(sys.argv)
    global DEFAULT_BOOK_COVER
    DEFAULT_BOOK_COVER = QPixmap(":/default_cover")
    window = QMainWindow()
    def handle_exceptions(t, val, tb):
      sys.__excepthook__(t, val, tb)
      try: QErrorMessage(window).showMessage("There was an unexpected error: <br>"+"<br>".join(traceback.format_exception(t, val, tb)))
      except: pass      
    sys.excepthook = handle_exceptions
    QCoreApplication.setOrganizationName("KovidsBrain")
    QCoreApplication.setApplicationName("prs500-gui")
    gui = MainWindow(window)    
    ret = app.exec_()    
    return ret