def _start_print(self, file_path=None, directory=None):
# start comms thread to stream the file
# set comms.ping_pong to False for fast stream mode
if file_path is None:
file_path = self.app.gcode_file
if directory is None:
directory = self.last_path
Logger.info('MainWindow: printing file: {}'.format(file_path))
try:
self.nlines = Comms.file_len(
file_path) # get number of lines so we can do progress and ETA
Logger.debug('MainWindow: number of lines: {}'.format(self.nlines))
except Exception:
Logger.warning('MainWindow: exception in file_len: {}'.format(
traceback.format_exc()))
self.nlines = None
self.start_print_time = datetime.datetime.now()
self.display('>>> Running file: {}, {} lines'.format(
file_path, self.nlines))
if self.app.comms.stream_gcode(
file_path, progress=lambda x: self.display_progress(x)):
self.display('>>> Run started at: {}'.format(
self.start_print_time.strftime('%x %X')))
else:
self.display('WARNING Unable to start print')
return
self.set_last_file(directory, file_path)
self.ids.print_but.text = 'Pause'
self.is_printing = True
self.paused = False
