demonstrate shell in a Tk window
diff --git a/Demo/tkinter/guido/ShellWindow.py b/Demo/tkinter/guido/ShellWindow.py
new file mode 100755
index 0000000..93a13d6
--- /dev/null
+++ b/Demo/tkinter/guido/ShellWindow.py
@@ -0,0 +1,164 @@
+import os
+import sys
+import string
+from Tkinter import *
+from ScrolledText import ScrolledText
+from Dialog import Dialog
+import signal
+
+TK_READABLE = 1
+TK_WRITABLE = 2
+TK_EXCEPTION = 4
+
+BUFSIZE = 512
+
+class ShellWindow(ScrolledText):
+
+ def __init__(self, master = None, cnf = {}):
+ try:
+ shell = cnf['shell']
+ del cnf['shell']
+ except KeyError:
+ try:
+ shell = os.environ['SHELL']
+ except KeyError:
+ shell = '/bin/sh'
+ shell = shell + ' -i'
+ args = string.split(shell)
+ shell = args[0]
+
+ 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, TK_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')
+ self.yview_pickplace('end')
+
+ def inputhandler(self, *args):
+ if not self.pid:
+ Dialog(self.master, {
+ 'text': "No active process",
+ 'title': "No process",
+ 'bitmap': 'error',
+ 'default': 0,
+ 'strings': ('OK',),
+ })
+ return
+ self.insert('end', '\n')
+ line = self.get(self.pos, 'end')
+ self.pos = self.index('end')
+ os.write(self.tochild, line)
+
+ def sendeof(self, *args):
+ if not self.pid:
+ Dialog(self.master, {
+ 'text': "No active process",
+ 'title': "No process",
+ 'bitmap': 'error',
+ 'default': 0,
+ 'strings': ('OK',),
+ })
+ return
+ os.close(self.tochild)
+
+ def sendsig(self, sig):
+ if not self.pid:
+ Dialog(self.master, {
+ 'text': "No active process",
+ 'title': "No process",
+ 'bitmap': 'error',
+ 'default': 0,
+ 'strings': ('OK',),
+ })
+ return
+ os.kill(self.pid, sig)
+
+ def sigint(self, *args):
+ self.sendsig(signal.SIGINT)
+
+ def sigquit(self, *args):
+ self.sendsig(signal.SIGQUIT)
+
+ def sigterm(self, *args):
+ self.sendsig(signal.SIGTERM)
+
+ def sigkill(self, *args):
+ self.sendsig(signal.SIGKILL)
+
+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
+ os.close(0)
+ os.close(1)
+ os.close(2)
+ 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:
+ print 'execvp failed'
+ os._exit(1)
+ os.close(p2cread)
+ os.close(c2pwrite)
+ return pid, c2pread, p2cwrite
+
+def test():
+ shell = string.join(sys.argv[1:])
+ cnf = {}
+ if shell:
+ cnf['shell'] = shell
+ root = Tk()
+ root.minsize(1, 1)
+ w = ShellWindow(root, cnf)
+ w.pack({'expand': 1, 'fill': 'both'})
+ w.focus_set()
+ w.tk.mainloop()
+
+if __name__ == '__main__':
+ test()