Swiftpack.co - Package - pkrll/SwiftArgs

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SwiftArgs is a small Swift framework for creating simple command line interfaces.


You can install SwiftArgs with the Swift Package Manager or Cocoapods.

Swift Package Manager

Add SwiftArgs as a dependency in Package.swift:

// Package.swift

dependencies: [
    .package(url: "https://github.com/pkrll/SwiftArgs", from: "0.5.0")


Add SwiftArgs to your Podfile:

pod 'SwiftArgs', '~> 0.5'


SwiftArgs offers four different kinds of argument types: CommandOption, BoolOption, StringOption and EnumOption.

Supply these to the SwiftArgs object, and run the parse() method to validate and parse the command line arguments (see below for an example).


A CommandOptionrepresents a command, which can accept sub arguments on its own:

$ my_app init
$ my_app init --bare
$ my_app package init --type library

BoolOption represents a boolean flag:

$ my_app --help

A StringOption represents an option that can take an arbitrary value:

$ my_app --set-path /some/path

An EnumOption<T> represents an option that only accepts predefined values:

$ my_app --type library


import Foundation
import SwiftArgs

enum BuildType: String {
	case debug
	case release

let help = BoolOption(
	name: "help",
	shortFlag: "h",
	longFlag: "help",
	description: "Display available options"

let version = BoolOption(
	name: "version",
	shortFlag: "v",
	longFlag: "version",
	description: "Display version information"

let buildType = EnumOption<BuildType>(
	name: "BuildType",
	shortFlag: "t",
	longFlag: "type",
	description: "Specify the build configuration: debug|release",
	isRequired: true

let clean = CommandOption("clean", description: "Clean up any build artifacts")
let build = CommandOption("build", withArguments: [help, buildType], description: "Build the project")
let test = CommandOption("test", withArguments: [help, buildType], description: "Test the project")
let run = CommandOption("run", withArguments: [help, buildType], description: "Execute the project")

let args = SwiftArgs(arguments: [help, version, clean, build, test, run])

do {
	try args.parse() // or try args.parse(["build", "--type", "debug"])
} catch {

* 	Check if the BoolOption help (-h, --help) or version
* 	(-v --version) was specified with the value property.
if help.value! {
	var argument: Argument? = nil

	if build.value { argument = build }
	if test.value { argument = test }
	if run.value { argument = run }

} else if version.value! {
	print("SwiftArgsDemo v1.0")
} else {
	* 	You can directly access the EnumOption's value property
	* 	to check its value (nil if not used)...
	if buildType.value == BuildType.debug {
		print("Build type: Debug!")
	} else if buildType.value == BuildType.release {
		print("Build type: Release!")
	* 	... or to check which command it's associated with, use
	* 	optional chaining to unwrap the nested arguments.
	if let bType = build.argument as? EnumOption<BuildType>, let value = bType.value {
		switch value {
		case BuildType.debug:
			print("Build type: Debug!")
		case BuildType.release:
			print("Build type: Release!")

	if build.value {
		print("Commence building...")


This framework is, in its API, heavily inspired by the CommandLineKit framework.


SwiftArgs was created by Ardalan Samimi.


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0.5.5 - Aug 10, 2019

Project converted to Swift 5.

0.5.4 - Jun 15, 2018


  • Bugfixes

0.5.2 - Jun 13, 2018

Fixed some bugs

0.5.1 - Jun 13, 2018

0.5.0 - Jun 12, 2018


  • Implemented required arguments.
  • Fixed issue where standalone commands could not be followed by other arguments.