This is pretty lame, even for kragen-hacks. But it might tell someone how to do something actually useful at some point.
#!/usr/local/bin/python # 'tkcat' # How to handle asynchronous filehandle (stdin/stdout) I/O (on Unix) # from the Tk event loop in Python --- mostly in the nature of an # executable note to myself. # Although it's kind of cool to use 'baud' and 'play-movie' from the # movie package I posted to kragen-hacks a while back: baud 300 < # sometextfile | play-movie | tkcat. # Some information came from # http://www.faqts.com/knowledge_base/view.phtml/aid/3728 by Fiona # Czuczman, Rob Hooft, Grant Edwards, and Russell E. Owen # According to # http://mail.python.org/pipermail/python-list/1999-June/005884.html, # a message from Matthew Cincera <[EMAIL PROTECTED]> on 25 Jun # 1999 14:19:58 -0700, createfilehandler is not supported on Windows # as of Tcl/Tk 8.0. # Programmers who write libraries that do things from an event loop, # but then require you to use their event loop instead of allowing you # to use your own, should be drawn and quartered. Using two such # libraries in one program requires two threads. import Tkinter, string, fcntl, FCNTL, sys, errno mw = Tkinter.Tk() # justify='left' makes lines of text attach to the left side of the # widget. # anchor='sw' means that when the window is subject to external sizing # constraints and so can't assume its natural size, show the lower # left-hand corner of it. l = Tkinter.Label(mw, justify='left', anchor='sw', background='white', font='courier') # expand means 'expand the widget's allocated space to fill available # space if necessary' # fill='both' means 'stretch the widget in both x and y to fill its # allocated space' l.pack(expand=1, fill='both') text = '' # doesn't differentiate between ' ' and '\n': # _, _, _, _, oldtext = l.configure('text') # also sometimes oldtext is a tuple and sometimes it's a string def readappend(fh, _): try: mystr = sys.stdin.read() except IOError, (errnum, str): if errnum != errno.EAGAIN: raise if mystr == '': # EOF sys.exit(0) global text text = text + mystr l.configure(text=text) def make_nonblocking(fh): if hasattr(fh, 'fileno'): fh = fh.fileno() fcntl.fcntl(fh, FCNTL.F_SETFL, FCNTL.O_NONBLOCK | fcntl.fcntl(fh, FCNTL.F_GETFL)) make_nonblocking(sys.stdin) Tkinter.tkinter.createfilehandler(sys.stdin, Tkinter.tkinter.READABLE, readappend) mw.mainloop()
