#!/usr/bin/python

__author__ = "Gabriel Ignacio Dain"
__doc__ = """
Gkill takes input from unix pipes and autamically kills the listed 
processes. This comes in handy when having to kill many similar 
processes, or as a shortcut for lazy sysadmins. The syntax is 
described by the help() function.

Gabriel Ignacio Dain (gabrieldain@gmail.com). GPLv2 2007"""

import re
import sys
import os

def args(input, args=["/bin/kill"]):
	"""Cleans the input and returns a list of PIDs to kill.
	Having "/bin/kill" as the first argument is necessary for
	kill to execute correctly."""
	for string in input:
		if len(string) > 1:
			args.append(string.split()[0])
		else:
			pass
	return args

def help():
	"""Displays author, contact and usage information."""
	print """
Gkill by Gabriel Ignacio Dain (gabrieldain@gmail.com). GPLv2 2007

Gkill takes input from unix pipes and autamically kills the listed 
processes. This comes in handy when having to kill many similar processes.
Gkill expects to recieve a list of processes from the standard input.
This list can be easily created by piping the output of ps into Gkill;
	ps [-a|-A] | gkill
However, this would kill all current processes. Using grep is the easiest
solution;
	ps [-a|-A] | grep APPLICATION | gkill
Note that this syntax is also valid:
	echo PID | gkill
While less useful for normal intercation with the shell, this might
prove useful for scripting purposes

[ running gkill with any arguments will show this message ]"""

if len(sys.argv) > 1:
	help()
else:
	os.execv('/bin/kill', args(sys.stdin.read().split("\n")))