A set of tools to help you create command line applications in Swift. Swiftline is comprised of several tools including: Colorize, which adds colours and styles to strings before writing them to the terminal; Ask, Choose and Agree, for creating different kinds of prompts to get information from the user; Run, a quick way to run an external command and read its standard output and standard error; Env, to read and write environment variables; and Args, which parses command line arguments and return a hash of the passed flags.