1 files changed, 146 insertions, 0 deletions
diff --git a/Demo/tkinter/guido/shell_window.py b/Demo/tkinter/guido/shell_window.py
new file mode 100644
index 00000000000..c5a04019009
--- /dev/null
+++ b/Demo/tkinter/guido/shell_window.py
@@ -0,0 +1,146 @@
+import os
+import sys
+from tkinter import *
+from tkinter.scrolledtext import ScrolledText
+from tkinter.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 = shell.split()
+        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, READABLE,
+                                  self.outputhandler)
+
+    def outputhandler(self, file, mask):
+        data = os.read(file, BUFSIZE).decode()
+        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.encode())
+        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')
+        os.closerange(3, MAXFD)
+        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 = ' '.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()