class Go < Formula
  homepage "https://golang.org"
  # Version 1.5 is going to require version 1.4 present to bootstrap 1.4
  # Perhaps we can use our previous bottles, ala the discussion around PyPy?
  # https://docs.google.com/document/d/1OaatvGhEAq7VseQ9kkavxKNAfepWy2yhPUBs96FGV28
  url "https://storage.googleapis.com/golang/go1.4.1.src.tar.gz"
  sha1 "c7a683e8d39b835e333199d68d0c0baefcd24a68"
  version "1.4.1"

  head "https://go.googlesource.com/go", :using => :git

  bottle do
    sha1 "d4dea35b225b79bf93214a4ccc37272d5b4095b6" => :yosemite
    sha1 "4209bab85e24002de969f1d96aaad5061bea068b" => :mavericks
    sha1 "b4bb2d3cd8ed997536d1504ed75cb92b0497c1b9" => :mountain_lion
  end

  option "with-cc-all", "Build with cross-compilers and runtime support for all supported platforms"
  option "with-cc-common", "Build with cross-compilers and runtime support for darwin, linux and windows"
  option "without-cgo", "Build without cgo"

  deprecated_option "cross-compile-all" => "with-cc-all"
  deprecated_option "cross-compile-common" => "with-cc-common"

  def install
    # host platform (darwin) must come last in the targets list
    if build.with? "cc-all"
      targets = [
        ["linux",   ["386", "amd64", "arm"]],
        ["freebsd", ["386", "amd64", "arm"]],
        ["netbsd",  ["386", "amd64", "arm"]],
        ["openbsd", ["386", "amd64"]],
        ["windows", ["386", "amd64"]],
        ["dragonfly", ["386", "amd64"]],
        ["plan9",   ["386", "amd64"]],
        ["solaris", ["amd64"]],
        ["darwin",  ["386", "amd64"]],
      ]
    elsif build.with? "cc-common"
      targets = [
        ["linux",   ["386", "amd64", "arm"]],
        ["windows", ["386", "amd64"]],
        ["darwin",  ["386", "amd64"]],
      ]
    else
      targets = [["darwin", [""]]]
    end

    # The version check is due to:
    # http://codereview.appspot.com/5654068
    (buildpath/"VERSION").write("default") if build.head?

    cd "src" do
      targets.each do |os, archs|
        cgo_enabled = os == "darwin" && build.with?("cgo") ? "1" : "0"
        archs.each do |arch|
          ENV["GOROOT_FINAL"] = libexec
          ENV["GOOS"]         = os
          ENV["GOARCH"]       = arch
          ENV["CGO_ENABLED"]  = cgo_enabled
          system "./make.bash", "--no-clean"
        end
      end
    end

    (buildpath/"pkg/obj").rmtree

    libexec.install Dir["*"]
    bin.install_symlink Dir["#{libexec}/bin/go*"]
  end

  def caveats; <<-EOS.undent
    As of go 1.2, a valid GOPATH is required to use the `go get` command:
      http://golang.org/doc/code.html#GOPATH

    `go vet` and `go doc` are now part of the go.tools sub repo:
      http://golang.org/doc/go1.2#go_tools_godoc

    To get `go vet` and `go doc` run:
      go get golang.org/x/tools/cmd/vet
      go get golang.org/x/tools/cmd/godoc

    You may wish to add the GOROOT-based install location to your PATH:
      export PATH=$PATH:#{opt_libexec}/bin
    EOS
  end

  test do
    (testpath/"hello.go").write <<-EOS.undent
    package main

    import "fmt"

    func main() {
        fmt.Println("Hello World")
    }
    EOS
    # Run go fmt check for no errors then run the program.
    # This is a a bare minimum of go working as it uses fmt, build, and run.
    system "#{bin}/go", "fmt", "hello.go"
    assert_equal "Hello World\n", `#{bin}/go run hello.go`
  end
end