From 458120dd40db6b4df55a4e96b650e16798ef06a0 Mon Sep 17 00:00:00 2001 From: cinap_lenrek Date: Tue, 3 May 2011 11:25:13 +0000 Subject: add hg and python --- sys/src/cmd/python/Demo/curses/repeat.py | 58 ++++++++++++++++++++++++++++++++ 1 file changed, 58 insertions(+) create mode 100755 sys/src/cmd/python/Demo/curses/repeat.py (limited to 'sys/src/cmd/python/Demo/curses/repeat.py') diff --git a/sys/src/cmd/python/Demo/curses/repeat.py b/sys/src/cmd/python/Demo/curses/repeat.py new file mode 100755 index 000000000..fa7daac17 --- /dev/null +++ b/sys/src/cmd/python/Demo/curses/repeat.py @@ -0,0 +1,58 @@ +#! /usr/bin/env python + +"""repeat + +This simple program repeatedly (at 1-second intervals) executes the +shell command given on the command line and displays the output (or as +much of it as fits on the screen). It uses curses to paint each new +output on top of the old output, so that if nothing changes, the +screen doesn't change. This is handy to watch for changes in e.g. a +directory or process listing. + +To end, hit Control-C. +""" + +# Author: Guido van Rossum + +# Disclaimer: there's a Linux program named 'watch' that does the same +# thing. Honestly, I didn't know of its existence when I wrote this! + +# To do: add features until it has the same functionality as watch(1); +# then compare code size and development time. + +import os +import sys +import time +import curses + +def main(): + if not sys.argv[1:]: + print __doc__ + sys.exit(0) + cmd = " ".join(sys.argv[1:]) + p = os.popen(cmd, "r") + text = p.read() + sts = p.close() + if sts: + print >>sys.stderr, "Exit code:", sts + sys.exit(sts) + w = curses.initscr() + try: + while True: + w.erase() + try: + w.addstr(text) + except curses.error: + pass + w.refresh() + time.sleep(1) + p = os.popen(cmd, "r") + text = p.read() + sts = p.close() + if sts: + print >>sys.stderr, "Exit code:", sts + sys.exit(sts) + finally: + curses.endwin() + +main() -- cgit v1.2.3