Swift 5.1 era argument parser
CLInterface protocol should be implemented by a class or a struct that will represent command line interface of your program. Apart from required description property, it should contain @Argument and @PositionalArgument properties for any arguments you want. They will be set automatically after you call parseArguments.
Both optional and required arguments are supported. Use default: and optional properies to get the behavior you want. (For example, non-optional property without default value will throw error at parseArguments call.)
Use Swift package manager to add to your project:
.package(url: "https://github.com/nikstar/CLInterface.git", from: "1.0.0"),This is work in progress. PRs and suggestions are welcome!
final class Swiftc : CLInterface {
var description = "Swift compiler"
@Argument("--output", "-o", usage: "Write output to <file>")
var outputPath: String?
@Argument("-g", usage: "Emit debug info", default: false)
var debugMode: Bool
@PositionalArgument(name: "files", usage: "Files that will be compiled")
var files: [String]
}After calling parseArguments, you will be able to use these properties like normal variables.
let swiftc = Swiftc()
try swiftc.parseArguments(["-o", "hello", "-g", "main.swift", "Greeter.swift"])
swiftc.outputPath // Optional("hello")
swiftc.debugMode // true
swiftc.files // ["main.swift", "Greeter.swift"]swiftc -h or swiftc --help prints usage info:
OVERVIEW: Swift compiler
OPTIONS:
--output, -o Write output to <file>
-g Emit debug info
--help Display available options
POSITIONAL ARGUMENTS:
files Files that will be compiled
See ExampleSwiftc for working example.