#!/usr/bin/python

# Download amstracker from http://www.kernelthread.com/software/ams/
# Put amstracker and screenswitch.py in the same directory. Go to this directory
# in the Terminal and type:
# ./amstracker -u 0.1 -s | python screenswitch.py
# Hit ctrl-c to exit.

THRESHOLD = 2 # lower numbers makes this more sensitive
COMPONENT = 0 # three dimensions: sideways: 0, forward/back: 1, up/down: 2

# two types of behaviour:
BEHAVIOR = "bump"

import sys, os

def run_command(VALUE):
    script = os.popen("osascript", "w")
    script.write('tell application "System Events"\r\n')

# for Virtue Desktops Trigger: right, left (by capri91)
    if VALUE < 0:
        script.write('keystroke (keystroke (ASCII character 28) using shift down & control down)\r\n')
    if VALUE > 0:
        script.write('keystroke (keystroke (ASCII character 29) using shift down & control down)\r\n')
    script.write('beep\r\n')
# for Virtue Desktops Trigger: right, left (by capri91)

    script.write('end tell\r\n')
    script.close()

since = 0
while 1:
    try:
        line = sys.stdin.readline()
        since += 1
        x = int(line.split()[COMPONENT])
        if abs(x) > THRESHOLD and since > 3: # ignore commands for 0.5 seconds
            if "bump" == BEHAVIOR:
                run_command(x) # for Virtue Desktops Trigger: right, left (by capri91)
            since = 0
    except KeyboardInterrupt:
        sys.exit(0)
    except:
        pass