version: 1
name: Test isempty
description: |
  Test the `isempty` command.
objectives:
  - condition: |
      as base {has "thneed"}
    goal:
      - |
        The goal is to pick up the thing right after the empty
        spot in the row.
solution: |
  def find_thing =
    e <- isempty;
    move;
    if e {} {find_thing}
  end;
  find_thing;
  grab
robots:
  - name: base
    dir: [1,0]
    devices:
      - scanner
      - branch predictor
      - grabber
      - strange loop
      - lambda
      - dictionary
      - logger
      - treads
      - solar panel
entities:
  - name: thneed
    display:
      attr: gold
      char: 'Y'
    description:
    - A thing that everyone needs!
    properties: [portable]
world:
  palette:
    '.': [grass]
    '>': [grass, tree, base]
    'o': [grass, rock]
    '$': [grass, LaTeX]
    'i': [grass, cotton]
    '0': [grass, bit (0)]
    '1': [grass, bit (1)]
    'R': [grass, pixel (R)]
    'G': [grass, pixel (G)]
    'B': [grass, pixel (B)]
    'Y': [grass, thneed]
  upperleft: [-5, 5]
  map: |
    >o$i01R.YGB