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import gleam/list
import gleam/set.{Set}
pub type Pos =
#(Int, Int)
pub const directions8 = [
#(1, 0),
#(1, 1),
#(0, 1),
#(-1, 1),
#(-1, 0),
#(-1, -1),
#(0, -1),
#(1, -1),
]
pub fn add(p1: Pos, p2: Pos) -> Pos {
#(p1.0 + p2.0, p1.1 + p2.1)
}
pub fn neighbours8(pos: Pos) -> Set(Pos) {
directions8
|> list.map(with: add(pos, _))
|> set.from_list
}
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