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import datetime
import sys, termios, tty
import inputs
def countdown(length):
"""countdown timer; length in seconds. returns start and time left (>0 if quit early)"""
time_left = length
start = datetime.datetime.now()
end = start + datetime.timedelta(seconds=time_left) # change to mins in final
accum = 0
timeout = 1/120 # 120Hz refresh
old_settings = termios.tcgetattr(sys.stdin)
tty.setcbreak(sys.stdin.fileno())
while True:
now = datetime.datetime.now()
time_left = end - now
if time_left.total_seconds() <= 0:
break
ch = inputs.getch_nb(timeout)
if ch == 'q':
print("\nexited early!")
break
# see https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797
print("\x1b[2K\r" + inputs.delta_to_HM(time_left), end="", flush=True)
accum += timeout
if accum >= 1:
accum = 0
termios.tcsetattr(sys.stdin, termios.TCSADRAIN, old_settings)
return (time_left, start)
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