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annotate Demo/curses/repeat.py @ 79675:c0a2294de787 2.7

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Issue #16199: Backport 2to3 typo fix from 3.2.
author Chris Jerdonek <chris.jerdonek@gmail.com>
date Thu, 11 Oct 2012 16:15:46 -0700
parents bef0236d7bfa
children 7d16b42fcdbd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 #! /usr/bin/env python
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2
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3 """repeat <shell-command>
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4
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5 This simple program repeatedly (at 1-second intervals) executes the
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6 shell command given on the command line and displays the output (or as
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7 much of it as fits on the screen). It uses curses to paint each new
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8 output on top of the old output, so that if nothing changes, the
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9 screen doesn't change. This is handy to watch for changes in e.g. a
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10 directory or process listing.
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11
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12 To end, hit Control-C.
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13 """
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14
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15 # Author: Guido van Rossum
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16
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17 # Disclaimer: there's a Linux program named 'watch' that does the same
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18 # thing. Honestly, I didn't know of its existence when I wrote this!
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19
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20 # To do: add features until it has the same functionality as watch(1);
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21 # then compare code size and development time.
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22
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23 import os
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24 import sys
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25 import time
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26 import curses
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27
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28 def main():
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29 if not sys.argv[1:]:
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30 print __doc__
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31 sys.exit(0)
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32 cmd = " ".join(sys.argv[1:])
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33 p = os.popen(cmd, "r")
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34 text = p.read()
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35 sts = p.close()
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36 if sts:
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37 print >>sys.stderr, "Exit code:", sts
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38 sys.exit(sts)
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39 w = curses.initscr()
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40 try:
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41 while True:
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42 w.erase()
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43 try:
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44 w.addstr(text)
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45 except curses.error:
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46 pass
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47 w.refresh()
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48 time.sleep(1)
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49 p = os.popen(cmd, "r")
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50 text = p.read()
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51 sts = p.close()
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52 if sts:
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53 print >>sys.stderr, "Exit code:", sts
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54 sys.exit(sts)
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55 finally:
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56 curses.endwin()
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57
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58 main()