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import datetime
import sys, termios, tty
import inputs
frequency = 120 # 120Hz refresh
def timer(length=0, ratio = 0.2, rest_accum=0):
"""countdown and stopwatch; pass length as 0 for stopwatch"""
start = datetime.datetime.now()
end = start + datetime.timedelta(seconds=length) # change to mins in final
accum = 0
timeout = 1/frequency
old_settings = termios.tcgetattr(sys.stdin)
tty.setcbreak(sys.stdin.fileno())
while True:
now = datetime.datetime.now()
elapsed = now - start
rest = elapsed * ratio + datetime.timedelta(seconds=rest_accum)
time_left = end - now
if length > 0 and time_left.total_seconds() <= 0:
break
ch = inputs.getch_nb(timeout)
if ch == 'q':
rest = datetime.timedelta()
break
elif ch == ' ':
break
if length > 0:
time_display = time_left
else:
time_display = elapsed
# see https://gist.github.com/fnky/458719343aabd01cfb17a3a4f7296797
print("\x1b[2K\r" + inputs.delta_to_HM(time_display) + "\t" +
inputs.delta_to_HM(rest), end="", flush=True)
accum += timeout
if accum >= 1:
accum = 0
termios.tcsetattr(sys.stdin, termios.TCSADRAIN, old_settings)
return (elapsed.total_seconds(), rest.total_seconds(), start)
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