class Commands::Install

def determine_install_method
  best = @base_command.environment.best_install_method
  @method = :http if best == :http and @method == :export
  case
  when (best == :http and @method != :http)
    msg = "Cannot install using subversion because `svn' cannot be found in your PATH"
  when (best == :export and (@method != :export and @method != :http))
    msg = "Cannot install using #{@method} because this project is not under subversion."
  when (best != :externals and @method == :externals)
    msg = "Cannot install using externals because vendor/plugins is not under subversion."
  end
  if msg
    puts msg
    exit 1
  end
  @method
end