#! /usr/bin/python3
# Last edited on 2018-07-06 17:07:56 by stolfilocal

def wait_for_user_ok():
  """Waits for user to type 'ok[ENTER]' or 'abort[ENTER]' on the python 
  shell window.  When she types 'ok', returns {True}. If she types
  'abort' or CTRL-D (end-of-file), returns {False}.  If the user types
  anything else, keeps asking again."""
  
  while True:
    stderr.write("[muff_mainloop:] type 'ok[ENTER]' or 'abort[ENTER]': \n");
    stderr.flush()
    s = stdin.readline()
    if s == "":
      # End of file:
      return False
    s = s.strip() # Remove leading and trailing whitespace, including EOL.
    if s == "ok":
      return True
    elif s == "abort":
      return False
# ----------------------------------------------------------------------

def switch_lights_on(sport,Lset):
  nS = len(Lset); # Number of entries in {Lset}
  kS = 0;         # Entry in {Lset}.
  lix_prev = -1   # Previous LED index from {Lset}.
  for lix in range(num_LEDs):
    # Make sure we have the next index from {Lset} in {lix_prev}:
    if lix_prev < lix:
      # Get next pair from {Lset}:
      if kS < nS:
        lix_prev = Lset[kS]
        kS = kS + 1
        assert type(lix_prev) is int and lix_prev >= 0 and lix_prev < num_LEDs
      else:
        lix_prev = num_LEDs
    assert lix_prev >= lix

    # Decide the intensity of LED {lix}:
    if lix == lix_prev:
      pwr = 1.0
    else:
      pwr = 0.0
      
    # Turn the LED on or off:
    muff_arduino.switch_LED(sport,lix,pwr)
  
  # We must be done:
  assert kS == nS
  return