Hacky solution to show estimated completion time for loaded program

lastLoadedFile = ""
def user_live_update():
    global lastLoadedFile
    if loaded_file:
        if loaded_file <> lastLoadedFile:
            runTime = calculateRunTime(loaded_file)
            print("New file loaded: " + loaded_file + " - " + str(runTime) + " seconds")
            lastLoadedFile = loaded_file
            f = open("/home/pi/ektefilewatcher", "w")
            f.write (loaded_file + "\r\n")
            f.write (str(runTime) + "\r\n")
            f.close()
#logic copied from axis.py in linuxcnc source
def calculateRunTime(loaded_file):
    runTime = ""
    if not loaded_file:
        return 0
    else:
        mf = vars.max_speed.get()
        return (sum(dist(l[1][:3], l[2][:3])/min(mf, l[3]) for l in o.canon.feed) +
            sum(dist(l[1][:3], l[2][:3])/min(mf, l[3])  for l in o.canon.arcfeed) +
            sum(dist(l[1][:3], l[2][:3])/mf  for l in o.canon.traverse) +
            o.canon.dwell_time
            )

def __init__(self, halcomp,builder,useropts):
        self.builder = builder
        self.isRunning = False
        self.runTime = 0
        self.estimatedTime = 0
        self.lastFile = ""
        glib.timeout_add_seconds(1, self.on_timer_tick)

def on_timer_tick(self, userdata=None):
        s.poll()
        currentFile = s.file
        if(currentFile != self.lastFile):
            f = open("/home/pi/ektefilewatcher", "r")
            watchedFile = f.readline().strip()
            fileTime = float(f.readline())
            f.close()
            if(watchedFile == currentFile ):
                print("got new file time: " + currentFile + " - " + str(fileTime) )
                self.lastFile = currentFile
                self.estimatedTime = fileTime
                self.builder.get_object("ekte_filetiming_display").set_label("" + self.getTime(self.estimatedTime))
        return True