Terminal UI Framework for Julia

using Tachikoma

@kwdef mutable struct Life <: Model
    quit::Bool = false
    grid::Matrix{Bool} = rand(24, 80) .< 0.25
end

Tachikoma.should_quit(m::Life) = m.quit
function Tachikoma.update!(m::Life, e::KeyEvent)
    e.key == :escape && (m.quit = true)
end

function Tachikoma.view(m::Life, f::Frame)
    h, w = size(m.grid)
    g = m.grid
    nc = [sum(g[mod1(i+di,h), mod1(j+dj,w)]
          for di in -1:1, dj in -1:1) - g[i,j]
          for i in 1:h, j in 1:w]
    g .= (nc .== 3) .| (g .& (nc .== 2))
    a, buf = f.area, f.buffer
    cs = [:primary, :accent, :success,
          :warning, :error]
    for i in 1:min(h, a.height),
        j in 1:min(w, a.width)
        g[i,j] || continue
        set_char!(buf, a.x+j-1, a.y+i-1,
            '█', tstyle(cs[clamp(nc[i,j],1,5)]))
    end
end

app(Life())