pickessid

#!/usr/bin/env python 
import subprocess 
import re 
from time import sleep

#call findsignals again
#prompt for cell #
#interface with Motor

user_if = ""
essid = ""

def pickessid_init():
	global user_if
	global essid
	user_if = raw_input("Enter the interface you want to use for scanning: ")
	essid = raw_input("Enter the ESSID: ")

def get_list( wlan_if ):
	proc = subprocess.Popen('sudo iwlist '+ wlan_if + ' scan 2>/dev/null', shell=True, stdout=subprocess.PIPE, ) 
	stdout_str = proc.communicate()[0] 
	stdout_list=stdout_str.split('\n') 
	stdout_list = stdout_list[::-1]
	return stdout_list
	
def get_signal( iwlist_list, this_essid ):
	print this_essid
	found = False
	match = ""
	for line in iwlist_list:
		line = line.strip()
		if not found:
			match = re.search( this_essid, line )
			if match:
				found = True
		else:
			match = re.search( "Signal level=-(\d+)", line )
			if match:
				return match.group(1)
				break
'''
while 1:
	get_signal( get_list( user_if ) ) 
	sleep(2)

essid_list=[] 
signal_list=[] 
for line in stdout_list: 
    line=line.strip() 
    match=re.search('ESSID:"(\S+)"',line) 
    if match: 
        essid_list.append(match.group(1)) 
    match=re.search('Signal level=-(\S+)',line) 
    if match: 
        signal_list.append(match.group(1)) 
print len(essid_list)
print len(signal_list)
'''