1import os
2import sys
3import string
4from Tkinter import *
5from ScrolledText import ScrolledText
6from Dialog import Dialog
7import signal
8
9BUFSIZE = 512
10
11class ShellWindow(ScrolledText):
12
13    def __init__(self, master=None, shell=None, **cnf):
14        if not shell:
15            try:
16                shell = os.environ['SHELL']
17            except KeyError:
18                shell = '/bin/sh'
19            shell = shell + ' -i'
20        args = string.split(shell)
21        shell = args[0]
22
23        apply(ScrolledText.__init__, (self, master), cnf)
24        self.pos = '1.0'
25        self.bind('<Return>', self.inputhandler)
26        self.bind('<Control-c>', self.sigint)
27        self.bind('<Control-t>', self.sigterm)
28        self.bind('<Control-k>', self.sigkill)
29        self.bind('<Control-d>', self.sendeof)
30
31        self.pid, self.fromchild, self.tochild = spawn(shell, args)
32        self.tk.createfilehandler(self.fromchild, READABLE,
33                                  self.outputhandler)
34
35    def outputhandler(self, file, mask):
36        data = os.read(file, BUFSIZE)
37        if not data:
38            self.tk.deletefilehandler(file)
39            pid, sts = os.waitpid(self.pid, 0)
40            print 'pid', pid, 'status', sts
41            self.pid = None
42            detail = sts>>8
43            cause = sts & 0xff
44            if cause == 0:
45                msg = "exit status %d" % detail
46            else:
47                msg = "killed by signal %d" % (cause & 0x7f)
48                if cause & 0x80:
49                    msg = msg + " -- core dumped"
50            Dialog(self.master,
51                   text=msg,
52                   title="Exit status",
53                   bitmap='warning',
54                   default=0,
55                   strings=('OK',))
56            return
57        self.insert(END, data)
58        self.pos = self.index("end - 1 char")
59        self.yview_pickplace(END)
60
61    def inputhandler(self, *args):
62        if not self.pid:
63            self.no_process()
64            return "break"
65        self.insert(END, "\n")
66        line = self.get(self.pos, "end - 1 char")
67        self.pos = self.index(END)
68        os.write(self.tochild, line)
69        return "break"
70
71    def sendeof(self, *args):
72        if not self.pid:
73            self.no_process()
74            return "break"
75        os.close(self.tochild)
76        return "break"
77
78    def sendsig(self, sig):
79        if not self.pid:
80            self.no_process()
81            return "break"
82        os.kill(self.pid, sig)
83        return "break"
84
85    def sigint(self, *args):
86        return self.sendsig(signal.SIGINT)
87
88    def sigquit(self, *args):
89        return self.sendsig(signal.SIGQUIT)
90
91    def sigterm(self, *args):
92        return self.sendsig(signal.SIGTERM)
93
94    def sigkill(self, *args):
95        return self.sendsig(signal.SIGKILL)
96
97    def no_process(self):
98        Dialog(self.master,
99               text="No active process",
100               title="No process",
101               bitmap='error',
102               default=0,
103               strings=('OK',))
104
105MAXFD = 100     # Max number of file descriptors (os.getdtablesize()???)
106
107def spawn(prog, args):
108    p2cread, p2cwrite = os.pipe()
109    c2pread, c2pwrite = os.pipe()
110    pid = os.fork()
111    if pid == 0:
112        # Child
113        for i in 0, 1, 2:
114            try:
115                os.close(i)
116            except os.error:
117                pass
118        if os.dup(p2cread) <> 0:
119            sys.stderr.write('popen2: bad read dup\n')
120        if os.dup(c2pwrite) <> 1:
121            sys.stderr.write('popen2: bad write dup\n')
122        if os.dup(c2pwrite) <> 2:
123            sys.stderr.write('popen2: bad write dup\n')
124        os.closerange(3, MAXFD)
125        try:
126            os.execvp(prog, args)
127        finally:
128            sys.stderr.write('execvp failed\n')
129            os._exit(1)
130    os.close(p2cread)
131    os.close(c2pwrite)
132    return pid, c2pread, p2cwrite
133
134def test():
135    shell = string.join(sys.argv[1:])
136    root = Tk()
137    root.minsize(1, 1)
138    if shell:
139        w = ShellWindow(root, shell=shell)
140    else:
141        w = ShellWindow(root)
142    w.pack(expand=1, fill=BOTH)
143    w.focus_set()
144    w.tk.mainloop()
145
146if __name__ == '__main__':
147    test()
148