swift-install

#!/usr/bin/env ruby
require "tmpdir"

version = ARGV[0].to_s
abort("Usage: swift-install <VERSION> <DESTINATION>") if version.empty?

dest = ARGV[1].to_s
abort("Usage: swift-install <VERSION> <DESTINATION>") if dest.empty?

dest = File.expand_path dest, Dir.pwd
Dir.mkdir dest unless Dir.exists? dest

case RUBY_PLATFORM
when /darwin/
  url = "https://swift.org/builds/development/xcode/swift-#{version}/swift-#{version}-osx.pkg"
  is_osx = true
when /linux/
  url = "https://swift.org/builds/development/ubuntu1404/swift-#{version}/swift-#{version}-ubuntu14.04.tar.gz"
  is_osx = false
else
  about("unsupported platform")
end

def process(url, dir)
 Dir.chdir(dir) do
    ok = system "wget #{url}"
    abort("File Not Found: #{url}") unless ok

    file = Dir.entries(dir).select { |e| File.file? e }[0]
    yield file
  end
end

Dir.mktmpdir("swift-install") do |dir|
  process(url, dir) do |file|
    if is_osx
      subdir = Dir.mkdir("unpacked")
      Dir.chdir("unpacked") do
        system "xar -xf ../#{file}"
        payload = Dir.glob("**/Payload")[0]
        system "tar -C #{dest} -zxf #{payload}"
      end
    else
      system "tar -C #{dest} -xf #{file} --strip 1"
    end
  end
end