chalk-demo.swift

#!/usr/bin/swift sh
import Foundation
import Chalk  // @mxcl == 0.3

extension Int {
    var fg: UInt8 {
        if !(16..<250 ~= self) || 24...36 ~= (self - 16) % 36 {
            return 16
        } else {
            return 255
        }
    }
    var bg: UInt8 {
        return UInt8(self)
    }
    var paddedString: String {
      return " \(self)".padding(toLength: 5, withPad: " ", startingAt: 0)
    }
    var terminator: String {
        return (self + 3).isMultiple(of: 6) ? "\n" : ""
    }
}

for x in 0...255 {
    print("\(x.paddedString, color: x.fg, background: x.bg)", terminator: x.terminator)
}