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February 22, 2017 22:26
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Control Linux screen brightness using keys in a Curses terminal
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#!/usr/bin/env python3 | |
import curses | |
max_b = int(open('/sys/class/backlight/radeon_bl0/max_brightness', 'r').read()) | |
min_b = 40 | |
columns = 70 | |
def main(stdscr): | |
stdscr.clear() | |
k = 'x' | |
stdscr.addstr(1, 0, 'q to quit') | |
while k not in 'qQ': | |
brightness_file = open('/sys/class/backlight/radeon_bl0/brightness', 'w+') | |
current = brightness_file.read() | |
stdscr.addstr(3, 0, current) | |
baseline = int(min_b / max_b * columns) | |
filled = int(int(current) / max_b * columns) - baseline | |
empty = columns - filled - baseline | |
stdscr.addstr(5, 0, '|' * baseline + '*' * filled + '-' * empty) | |
k = stdscr.getkey() | |
if k in 'uUkKpP' or k == 'KEY_UP': | |
new_brightness = int(int(current) * 1.1) | |
elif k in 'dDjJnN' or k == 'KEY_DOWN': | |
new_brightness = int(int(current) * (10.0/11)) | |
stdscr.refresh() | |
if new_brightness < min_b: | |
new_brightness = min_b | |
if new_brightness > max_b: | |
new_brightness = max_b | |
brightness_file.write(str(new_brightness) + '\n') | |
brightness_file.close() | |
curses.wrapper(main) |
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