#!/usr/bin/env python3

"""
Tkinter GUI to adjust xrandr brightness setting on the fly
"""

from tkinter import *
import os

c = 70
d = 5

def setb():
	lab.config(text = "%u%%" % c)
	os.system("xrandr --output DFP2  --brightness %f" % (c / 100))

def m():
	global c

	if c > 0:
		c -= d
	setb()

def p():
	global c

	if c < 100:
		c += d
	setb()

master = Tk()

f1 = Frame(master)
f1.pack(side = TOP, fill = Y)
f2 = Frame(master)
f2.pack(side = BOTTOM, fill = Y)

minus_but = Button(f1, text = "  −  ", command = m)
minus_but.pack(side = LEFT)
plus_but = Button(f1, text = "   +  ", command = p)
plus_but.pack(side = RIGHT)
lab = Label(f2, text = '')
lab.pack(side = TOP)

setb()

master.title("PyBright")

mainloop()