ShellWindow.py :  » Language-Interface » ChinesePython » chinesepython2.1.3-0.4 » Demo » tkinter » guido » Python Open Source

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Python Open Source » Language Interface » ChinesePython 
ChinesePython » chinesepython2.1.3 0.4 » Demo » tkinter » guido » ShellWindow.py
import os
import sys
import string
from Tkinter import *
from ScrolledText import ScrolledText
from Dialog import Dialog
import signal

BUFSIZE = 512

class ShellWindow(ScrolledText):

  def __init__(self, master=None, shell=None, **cnf):
    if not shell:
      try:
        shell = os.environ['SHELL']
      except KeyError:
        shell = '/bin/sh'
      shell = shell + ' -i'
    args = string.split(shell)
    shell = args[0]

    apply(ScrolledText.__init__, (self, master), cnf)
    self.pos = '1.0'
    self.bind('<Return>', self.inputhandler)
    self.bind('<Control-c>', self.sigint)
    self.bind('<Control-t>', self.sigterm)
    self.bind('<Control-k>', self.sigkill)
    self.bind('<Control-d>', self.sendeof)

    self.pid, self.fromchild, self.tochild = spawn(shell, args)
    self.tk.createfilehandler(self.fromchild, READABLE,
            self.outputhandler)

  def outputhandler(self, file, mask):
    data = os.read(file, BUFSIZE)
    if not data:
      self.tk.deletefilehandler(file)
      pid, sts = os.waitpid(self.pid, 0)
      print 'pid', pid, 'status', sts
      self.pid = None
      detail = sts>>8
      cause = sts & 0xff
      if cause == 0:
        msg = "exit status %d" % detail
      else:
        msg = "killed by signal %d" % (cause & 0x7f)
        if cause & 0x80:
          msg = msg + " -- core dumped"
      Dialog(self.master,
             text=msg,
             title="Exit status",
             bitmap='warning',
             default=0,
             strings=('OK',))
      return
    self.insert(END, data)
    self.pos = self.index("end - 1 char")
    self.yview_pickplace(END)

  def inputhandler(self, *args):
    if not self.pid:
      self.no_process()
      return "break"
    self.insert(END, "\n")
    line = self.get(self.pos, "end - 1 char")
    self.pos = self.index(END)
    os.write(self.tochild, line)
    return "break"

  def sendeof(self, *args):
    if not self.pid:
      self.no_process()
      return "break"
    os.close(self.tochild)
    return "break"

  def sendsig(self, sig):
    if not self.pid:
      self.no_process()
      return "break"
    os.kill(self.pid, sig)
    return "break"

  def sigint(self, *args):
    return self.sendsig(signal.SIGINT)

  def sigquit(self, *args):
    return self.sendsig(signal.SIGQUIT)

  def sigterm(self, *args):
    return self.sendsig(signal.SIGTERM)

  def sigkill(self, *args):
    return self.sendsig(signal.SIGKILL)

  def no_process(self):
    Dialog(self.master,
           text="No active process",
           title="No process",
           bitmap='error',
           default=0,
           strings=('OK',))

MAXFD = 100  # Max number of file descriptors (os.getdtablesize()???)

def spawn(prog, args):
  p2cread, p2cwrite = os.pipe()
  c2pread, c2pwrite = os.pipe()
  pid = os.fork()
  if pid == 0:
    # Child
    for i in 0, 1, 2:
        try:
      os.close(i)
        except os.error:
      pass
    if os.dup(p2cread) <> 0:
      sys.stderr.write('popen2: bad read dup\n')
    if os.dup(c2pwrite) <> 1:
      sys.stderr.write('popen2: bad write dup\n')
    if os.dup(c2pwrite) <> 2:
      sys.stderr.write('popen2: bad write dup\n')
    for i in range(3, MAXFD):
      try:
        os.close(i)
      except:
        pass
    try:
      os.execvp(prog, args)
    finally:
      sys.stderr.write('execvp failed\n')
      os._exit(1)
  os.close(p2cread)
  os.close(c2pwrite)
  return pid, c2pread, p2cwrite

def test():
  shell = string.join(sys.argv[1:])
  root = Tk()
  root.minsize(1, 1)
  if shell:
      w = ShellWindow(root, shell=shell)
  else:
      w = ShellWindow(root)
  w.pack(expand=1, fill=BOTH)
  w.focus_set()
  w.tk.mainloop()

if __name__ == '__main__':
  test()
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