chswift

The missing Swift version manager.

Installation

$ brew tap neonichu/formulae
$ brew install chswift

Amend configuration as advised by the installation procedure.

Usage

Running without any arguments will show installed Swift versions and the currently selected one:

$ chswift 
 * 1.1 (swift-600.0.57.4)
   1.2 (swiftlang-602.0.47.4 clang-602.0.48)

Specify a version number to change the current Swift:

$ chswift 1.2
$ swift --version
Apple Swift version 1.2 (swiftlang-602.0.47.4 clang-602.0.48)
Target: x86_64-apple-darwin14.3.0

Fall back to the Swift defined by your xcode-select configuration:

$ chswift system

You can also configure a local environment in .swift-version files, which contain only the the version you want to use. To use Swift 1.2, do the following in your directory:

$ echo 1.2 >.swift-version

You can verify it's working using the following.

$ swift --version
Apple Swift version 1.2 (swiftlang-602.0.47.4 clang-602.0.48)
Target: x86_64-apple-darwin14.3.0

Managing Swift Versions

In order to have multiple Swift versions listed when you run chswift, you will need to have multiple Xcode versions running. The simplest way is to use xcode-install. If you rely solely on the Mac App Store, updates will change your system's Swift version.

Testing

$ brew install shunit2
$ make test

Thanks