A Homebrew formula for the Flutter SDK

flutter.rb

class Flutter < Formula
  desc "Google’s UI toolkit for mobile, web, and desktop from a single codebase"
  homepage "https://flutter.dev"
  url "https://storage.googleapis.com/flutter_infra/releases/releases_macos.json"
  version "sdk"

  require 'json'

  bottle :unneeded

  def install
    puts "\n📡 Retrieving latest stable release...\n\n"
    releases_json = `curl -H "Flutter SDK Homebrew" https://storage.googleapis.com/flutter_infra/releases/releases_macos.json`
    data = JSON.parse releases_json

    base_url = data["base_url"]
    current_stable = data["current_release"]["stable"]
    releases = data["releases"]

    result = nil
    releases.each do |release|
      if release["hash"] == current_stable
        result = release
        break
      end
    end

    puts "\n🎯 Found version #{result["version"]} - downloading...\n\n"
    `curl #{base_url}/#{result["archive"]} -L -o flutter.zip`

    puts "\n📦 Unpacking files...\n\n"
    `bsdtar --strip-components=1 -xvf flutter.zip`

    puts "\n🚧 Installing...\n"
    prefix.install Dir["packages",".git*"]
    bin.install Dir["bin/*"]
  end

  def post_install
    puts "\n👮‍ Updating cache folder permissions..."
    chmod "u+rw", Dir["#{prefix}/bin/cache/", "#{prefix}/bin/cache/*"]
    puts "\n🎉‍ Flutter successfully installed! 👉 You may want to run flutter doctor to complete the Flutter SDK setup.\n\n"
  end

  test do
    system bin/"flutter", "--help"
    system bin/"flutter", "create test_app"
    assert_predicate testpath/"test_app.iml", :exist?
  end
end