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# Example program showing that 'return-continuation-until-mark' can 'pause' a
# function call, returning a continuation, and that calling the continuation
# can 'resume' the paused function call.
#
# To run:
#   $ git clone https://github.com/akkartik/mu
#   $ cd mu
#   $ ./mu continuation1.mu
#
# Expected output:
#   1

def main [
  local-scope
  k:continuation <- call-with-continuation-mark 100/mark, create-yielder
  x:num <- call k  # should return 1
  $print x 10/newline
]

def create-yielder -> n:num [
  local-scope
  load-inputs
  return-continuation-until-mark 100/mark
  return 1
]
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# To check our support for screens in scenarios, rewrite tests from print.mu

scenario print-character-at-top-left-2 [
  local-scope
  assume-screen 3/width, 2/height
  run [
    a:char <- copy 97/a
    screen <- print screen, a
  ]
  screen-should-contain [
    .a  .
    .   .
  ]
]

scenario clear-line-erases-printed-characters-2 [
  local-scope
  assume-screen 5/width, 3/height
  # print a character
  a:char <- copy 97/a
  screen <- print screen, a
  # move cursor to start of line
  screen <- move-cursor screen, 0/row, 0/column
  run [
    screen <- clear-line screen
  ]
  screen-should-contain [
    .     .
    .     .
    .     .
  ]
]

scenario scroll-screen [
  local-scope
  assume-screen 3/width, 2/height
  run [
    a:char <- copy 97/a
    move-cursor screen, 1/row, 2/column
    screen <- print screen, a
    screen <- print screen, a
  ]
  screen-should-contain [
    .  a.
    .a  .
  ]
]