require 'formula_installer'
require 'hardware'

module Homebrew extend self
  def install
    brew_install
  end
end

def brew_install
  ############################################################ sanity checks
  case Hardware.cpu_type when :ppc, :dunno
    abort "Sorry, Homebrew does not support your computer's CPU architecture.\n"+
          "For PPC support, see: http://github.com/sceaga/homebrew/tree/powerpc"
  end

  raise "Cannot write to #{HOMEBREW_CELLAR}" if HOMEBREW_CELLAR.exist? and not HOMEBREW_CELLAR.writable?
  raise "Cannot write to #{HOMEBREW_PREFIX}" unless HOMEBREW_PREFIX.writable?

  ################################################################# warnings
  begin
    if MACOS_VERSION >= 10.6
      opoo "You should upgrade to Xcode 3.2.3" if llvm_build < RECOMMENDED_LLVM
    else
      opoo "You should upgrade to Xcode 3.1.4" if (gcc_40_build < RECOMMENDED_GCC_40) or (gcc_42_build < RECOMMENDED_GCC_42)
    end
  rescue
    # the reason we don't abort is some formula don't require Xcode
    # TODO allow formula to declare themselves as "not needing Xcode"
    opoo "Xcode is not installed! Builds may fail!"
  end

  if macports_or_fink_installed?
    opoo "It appears you have MacPorts or Fink installed."
    puts "Software installed with MacPorts and Fink are known to cause problems."
    puts "If you experience issues try uninstalling these tools."
  end

  ################################################################# install!
  installer = FormulaInstaller.new
  installer.install_deps = !ARGV.include?('--ignore-dependencies')

  ARGV.formulae.each do |f|
    if not f.installed? or ARGV.force?
      installer.install f
    else
      puts "Formula already installed: #{f.prefix}"
    end
  end
end

def check_for_blacklisted_formula names
  return if ARGV.force?

  names.each do |name|
    case name
    when 'tex', 'tex-live', 'texlive' then abort <<-EOS.undent
      Installing TeX from source is weird and gross, requires a lot of patches,
      and only builds 32-bit (and thus can't use Homebrew deps on Snow Leopard.)

      We recommend using a MacTeX distribution:
        http://www.tug.org/mactex/
    EOS

    when 'mercurial', 'hg' then abort <<-EOS.undent
      Mercurial can be install thusly:
        brew install pip && pip install mercurial
    EOS

    when 'npm' then abort <<-EOS.undent
      npm can be installed thusly by following the instructions at
        http://npmjs.org/

      To do it in one line, use this command:
        curl http://npmjs.org/install.sh | sudo sh
    EOS

    when 'setuptools' then abort <<-EOS.undent
      When working with a Homebrew-built Python, distribute is preferred
      over setuptools, and can be used as the prerequisite for pip.

      Install distribute using:
        brew install distribute
    EOS
    end
  end
end