Arena is a macOS command line tool to create an Xcode project with a Swift Playground that's readily set up to use a Swift Package Manager library. You can reference both Github and local repositories. The latter is especially useful to spin up a Playground while working on a library.
Arena can also create a Playground in "Playground Book" format, which is the file format supported by "Swift Playgrounds". These playgrounds can then be synced and opened on the iOS version of "Swift Playgrounds" as well.
Here is an overview of the
arena command line interface:
arena --help OVERVIEW: Creates an Xcode project with a Playground and one or more SPM libraries imported and ready for use. USAGE: arena [--book] [--force] [--libs <libs> ...] [--outputdir <outputdir>] [--platform <platform>] [--version] [--skip-open] [<dependencies> ...] ARGUMENTS: <dependencies> Dependency url(s) and (optionally) version specification OPTIONS: --book Create a Swift Playgrounds compatible Playground Book bundle (experimental). -f, --force Overwrite existing file/directory -l, --libs <libs> Names of libraries to import (inferred if not provided) -o, --outputdir <outputdir> Directory where project folder should be saved (default: /Users/sas/Projects/Arena/Arena-Playground) -p, --platform <platform> Platform for Playground (one of 'macos', 'ios', 'tvos') (default: macos) -v, --version Show version --skip-open Do not open project in Xcode on completion -h, --help Show help information.
Import Github repository
arena https://github.com/finestructure/Gala ➡️ Package: https://github.com/finestructure/Gala @ from(0.2.1) 🔧 Resolving package dependencies… 📔 Libraries found: Gala ✅ Created project in folder 'Arena-Playground'
Using Github shorthand syntax
You can skip the protocol and domain when referring to Github projects:
arena finestructure/Gala ➡️ Package: https://github.com/finestructure/Gala @ from(0.2.1) 🔧 Resolving package dependencies… 📔 Libraries found: Gala ✅ Created project in folder 'Arena-Playground'
Import local repository
arena ~/Projects/Parser ➡️ Package: file:///Users/sas/Projects/Parser @ path 🔧 Resolving package dependencies… 📔 Libraries found: Parser ✅ Created project in folder 'Arena-Playground'
arena ~/Projects/Parser finestructure/Gala ➡️ Package: file:///Users/sas/Projects/Parser @ path ➡️ Package: https://github.com/finestructure/Gala @ from(0.2.1) 🔧 Resolving package dependencies… 📔 Libraries found: Parser, Gala ✅ Created project in folder 'Arena-Playground'
In case you want to fetch a particular revision, range of revisions, or branch, you can use a syntax similar to the one used in a
Package.swift file. Here's what's supported and the corresponding package dependecy that it will create in the generated project:
.package(url: "https://github.com/finestructure/Gala", exact: "0.1.0")
.package(url: "https://github.com/finestructure/Gala", from: "0.1.0")
.package(url: "https://github.com/finestructure/Gala", "0.1.0"..<"4.0.0")
.package(url: "https://github.com/finestructure/Gala", "0.1.0"..<"4.0.1")
.package(url: "https://github.com/finestructure/Gala", branch: "master")
.package(url: "https://github.com/finestructure/Gala", revision: "7235531e92e71176dc31e77d6ff2b128a2602110")
Make sure to properly quote the URL if you are using the
..< range operator. Otherwise your shell will interpret the
< character as input redirection.
Adding another dependency
Arena does not currently support adding further depenencies to an existing playground. However, since its dependencies are managed via the
Dependencies package, you can simply add further entries to its
Package.swift file - just like you would when extending any other package manifest.
Here's what this looks like:
How to install Arena
You can install Arena with Homebrew:
brew install finestructure/tap/arena
You can install Arena with Mint:
mint install finestructure/arena
Last not least, you can build and install
arena via the included
Makefile by running:
This will copy the binary
Overriding the default playground code
Be default, Arena adds
import statements for the library targets it finds in a package.
As a package author, you can override this behaviour by adding a file
.arena-sample.swift to the top level of your repository. The contents of this file will be used as the playground source code.
Arena – Spanish for "sand" – is abundant in playgrounds. And also, sometimes you've got to take your source code to the arena for a fight 😅
Starting with version 1.0,
arena requires Xcode 12. Xcode 12 brings a number of improvements that make playgrounds work much better than previous versions of Xcode. Also,
arena now creates a simpler project structer that can be manually edited to add more dependencies.
If you want to use
arena with Xcode 11, please use the latest 0.x release.
Playground books created by
arena should run on macOS as well as iOS. Please bear in mind that the Swift packages you import when creating playground books will need to be iOS compatible.
Note that while creating playgrounds requires macOS 10.15+ and Swift 5.3, the resulting playgrounds should be supported on a wider range of operating system and compiler versions. This will mainly depend on the packages you are importing.