connection:
  initial: "faucet:input | launch:draw | drain:output"
drain:
  output:
    destination: '-'
faucet:
  input:
    source: '-'
launch:
  draw:
    cmd: "awk"
    arg:
      - '-F'
      - ':'
      - '-f'
      - 'examples/tic-tac-toe/draw.awk'