require 'formula'

class Go < Formula
  homepage 'http://golang.org'
  head 'https://go.googlecode.com/hg/'
  url 'https://go.googlecode.com/files/go1.1.2.src.tar.gz'
  version '1.1.2'
  sha1 'f5ab02bbfb0281b6c19520f44f7bc26f9da563fb'

  bottle do
    sha1 '491bb29bddb72b0e612a09985626e9dcd5b2cccf' => :mountain_lion
    sha1 '74fcdfacb0f7c50df509202bac6f853fe00d1457' => :lion
    sha1 '0ff1f95940509cae6545f92cf4776aed14e36100' => :snow_leopard
  end

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

  devel do
    url 'https://go.googlecode.com/files/go1.2rc2.src.tar.gz'
    version '1.2rc2'
    sha1 '1fc3b39431551ffa69035ccffea18f4328dc2e8c'
  end

  if build.with? 'cgo' and not build.devel?
    depends_on 'apple-gcc42' if MacOS.version >= :mountain_lion

    fails_with :clang do
      cause "clang: error: no such file or directory: 'libgcc.a'"
    end
  end

  # Upstream patch for a switch statement that causes a clang error
  # Should be in the next release.
  # http://code.google.com/p/go/source/detail?r=000ecca1178d67c9b482d3fb0b6a1bc4aeef2472&path=/src/cmd/ld/lib.c
  def patches; DATA; end unless build.devel?

  def install
    # For Clang cgo support Go needs to be able to tell through CC.
    ENV['CC'] = 'clang' if build.devel? and ENV.compiler == :clang

    # install the completion scripts
    bash_completion.install 'misc/bash/go' => 'go-completion.bash'
    zsh_completion.install 'misc/zsh/go' => 'go'

    # host platform (darwin) must come last in the targets list
    if build.include? 'cross-compile-all'
      targets = [
        ['linux',   ['386', 'amd64', 'arm']],
        ['freebsd', ['386', 'amd64']],
        ['netbsd',  ['386', 'amd64']],
        ['openbsd', ['386', 'amd64']],
        ['windows', ['386', 'amd64']],
        ['darwin',  ['386', 'amd64']],
      ]
    elsif build.include? 'cross-compile-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/*"]
  end

  def caveats
    changelog = <<-EOS.undent
    The go get command no longer allows $GOROOT as
    the default destination in Go 1.1 when downloading package source.
    To use the go get command, a valid $GOPATH is now required.

    As a result of the previous change, the go get command will also fail
    when $GOPATH and $GOROOT are set to the same value.

    More information here: http://golang.org/doc/code.html#GOPATH
    EOS

    if build.devel?
      changelog += <<-EOS.undent

      In go 1.2 go vet and go doc are now part of the go.tools sub repo.
      see: http://tip.golang.org/doc/go1.2#go_tools_godoc

      To get go vet and go doc run:
        $ go get code.google.com/p/go.tools/cmd/godoc
        $ go get code.google.com/p/go.tools/cmd/vet
      EOS
    end
    return changelog
  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

__END__
# HG changeset patch
# User Dave Cheney <dave@cheney.net>
# Date 1373336072 18000
#      Mon Jul 08 21:14:32 2013 -0500
# Node ID 000ecca1178d67c9b482d3fb0b6a1bc4aeef2472
# Parent  02b673333fab068d9e12106c01748c2d23682bac
cmd/ld: trivial: fix unhandled switch case

Fix warning found by clang 3.3.

R=rsc, r
CC=golang-dev
https://codereview.appspot.com/11022043

diff -r 02b673333fab -r 000ecca1178d src/cmd/ld/lib.c
--- a/src/cmd/ld/lib.c	Tue Jul 09 11:12:05 2013 +1000
+++ b/src/cmd/ld/lib.c	Mon Jul 08 21:14:32 2013 -0500
@@ -665,6 +665,9 @@
 	case '6':
 		argv[argc++] = "-m64";
 		break;
+	case '5':
+		// nothing required for arm
+		break;
 	}
 	if(!debug['s'] && !debug_s) {
 		argv[argc++] = "-gdwarf-2";