You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: perkeep.rb
    path of file: ./repos/homebrew-core/Formula/p
    
    the code of the file until where you have to start completion: class Perkeep < Formula
  desc "Lets you permanently keep your stuff, for life"
  homepage "https://perkeep.org/"
  license "Apache-2.0"
  revision 1
  head "https://github.com/perkeep/perkeep.git", b
    
  def install
    if build.stable?
      ENV["GOPATH"] = buildpath
      ENV["CAMLI_GOPHERJS_GOROOT"] = Formula["go@1.18"].opt_libexec

      (buildpath/"src/perkeep.org").install buildpath.children

      # Vendored version of gopherjs requires go 1.10, so use the newest available gopherjs, which
      # supports newer Go versions.
      rm_rf buildpath/"src/perkeep.org/vendor/github.com/gopherjs/gopherjs"
      resource("gopherjs").stage buildpath/"src/perkeep.org/vendor/github.com/gopherjs/gopherjs"

      cd "src/perkeep.org" do
        system "go", "run", "make.go"
      end

      bin.install Dir["bin/*"].select { |f| File.executable? f }
    else
      system "go", "run", "make.go"
      bin.install Dir[".brew_home/go/bin/*"].select { |f| File.executable? f }
    end