Mercurial > cpython-lru_cache-weakref

annotate Demo/tkinter/guido/ShellWindow.py @ 5817:48b94de85bf3 legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents e9b35cc88b50
children 23083bd8c261
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1 import os
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2 import sys
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3 import string
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4 from Tkinter import *
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5 from ScrolledText import ScrolledText
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6 from Dialog import Dialog
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7 import signal
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8
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9 BUFSIZE = 512
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10
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11 class ShellWindow(ScrolledText):
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12
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13 def __init__(self, master=None, shell=None, **cnf):
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14 if not shell:
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15 try:
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16 shell = os.environ['SHELL']
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17 except KeyError:
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18 shell = '/bin/sh'
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19 shell = shell + ' -i'
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20 args = string.split(shell)
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21 shell = args[0]
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22
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23 apply(ScrolledText.__init__, (self, master), cnf)
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24 self.pos = '1.0'
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25 self.bind('<Return>', self.inputhandler)
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26 self.bind('<Control-c>', self.sigint)
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27 self.bind('<Control-t>', self.sigterm)
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28 self.bind('<Control-k>', self.sigkill)
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29 self.bind('<Control-d>', self.sendeof)
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30
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31 self.pid, self.fromchild, self.tochild = spawn(shell, args)
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32 self.tk.createfilehandler(self.fromchild, READABLE,
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33 self.outputhandler)
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34
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35 def outputhandler(self, file, mask):
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36 data = os.read(file, BUFSIZE)
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37 if not data:
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38 self.tk.deletefilehandler(file)
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39 pid, sts = os.waitpid(self.pid, 0)
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40 print 'pid', pid, 'status', sts
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41 self.pid = None
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42 detail = sts>>8
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43 cause = sts & 0xff
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44 if cause == 0:
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45 msg = "exit status %d" % detail
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46 else:
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47 msg = "killed by signal %d" % (cause & 0x7f)
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48 if cause & 0x80:
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49 msg = msg + " -- core dumped"
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50 Dialog(self.master,
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51 text=msg,
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52 title="Exit status",
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53 bitmap='warning',
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54 default=0,
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55 strings=('OK',))
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56 return
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57 self.insert(END, data)
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58 self.pos = self.index("end - 1 char")
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59 self.yview_pickplace(END)
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60
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61 def inputhandler(self, *args):
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62 if not self.pid:
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63 self.no_process()
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64 return "break"
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65 self.insert(END, "\n")
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66 line = self.get(self.pos, "end - 1 char")
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67 self.pos = self.index(END)
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68 os.write(self.tochild, line)
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69 return "break"
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70
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71 def sendeof(self, *args):
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72 if not self.pid:
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73 self.no_process()
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74 return "break"
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75 os.close(self.tochild)
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76 return "break"
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77
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78 def sendsig(self, sig):
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79 if not self.pid:
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80 self.no_process()
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81 return "break"
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82 os.kill(self.pid, sig)
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83 return "break"
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84
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85 def sigint(self, *args):
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86 return self.sendsig(signal.SIGINT)
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87
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88 def sigquit(self, *args):
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89 return self.sendsig(signal.SIGQUIT)
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90
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91 def sigterm(self, *args):
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92 return self.sendsig(signal.SIGTERM)
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93
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94 def sigkill(self, *args):
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95 return self.sendsig(signal.SIGKILL)
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96
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97 def no_process(self):
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98 Dialog(self.master,
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99 text="No active process",
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100 title="No process",
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101 bitmap='error',
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102 default=0,
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103 strings=('OK',))
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104
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105 MAXFD = 100 # Max number of file descriptors (os.getdtablesize()???)
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106
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107 def spawn(prog, args):
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108 p2cread, p2cwrite = os.pipe()
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109 c2pread, c2pwrite = os.pipe()
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110 pid = os.fork()
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111 if pid == 0:
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112 # Child
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113 os.close(0)
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114 os.close(1)
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115 os.close(2)
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116 if os.dup(p2cread) <> 0:
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117 sys.stderr.write('popen2: bad read dup\n')
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118 if os.dup(c2pwrite) <> 1:
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119 sys.stderr.write('popen2: bad write dup\n')
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120 if os.dup(c2pwrite) <> 2:
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121 sys.stderr.write('popen2: bad write dup\n')
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122 for i in range(3, MAXFD):
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123 try:
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124 os.close(i)
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125 except:
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126 pass
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127 try:
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128 os.execvp(prog, args)
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129 finally:
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130 sys.stderr.write('execvp failed\n')
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131 os._exit(1)
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132 os.close(p2cread)
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133 os.close(c2pwrite)
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134 return pid, c2pread, p2cwrite
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135
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136 def test():
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137 shell = string.join(sys.argv[1:])
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138 root = Tk()
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139 root.minsize(1, 1)
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140 if shell:
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141 w = ShellWindow(root, shell=shell)
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142 else:
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143 w = ShellWindow(root)
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144 w.pack(expand=1, fill=BOTH)
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145 w.focus_set()
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146 w.tk.mainloop()
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147
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148 if __name__ == '__main__':
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149 test()