class RSpec::Core::ConfigurationOptions

def args_from_options_file(path)
  return [] unless File.exist?(path)
  config_string = options_file_as_erb_string(path)
  config_string.split(/\n+/).map {|l| l.split}.flatten
end

def configure(config)
  keys = options.keys
  keys.unshift(:requires) if keys.delete(:requires)
  keys.unshift(:libs)     if keys.delete(:libs)
  keys.each do |key|
    config.send("#{key}=", options[key])
  end
end

def drb_argv
  argv = []
  argv << "--color"     if options[:color_enabled]
  argv << "--profile"   if options[:profile_examples]
  argv << "--backtrace" if options[:full_backtrace]
  argv << "--tty"       if options[:tty]
  argv << "--fail-fast"  if options[:fail_fast]
  argv << "--format"       << options[:formatter]               if options[:formatter]
  argv << "--line_number"  << options[:line_number]             if options[:line_number]
  argv << "--example"      << options[:full_description].source if options[:full_description]
  (options[:libs] || []).each do |path|
    argv << "-I" << path
  end
  (options[:requires] || []).each do |path|
    argv << "--require" << path
  end
  argv + options[:files_or_directories_to_run]
end

def initialize(args)
  @args = args
end

def local_options_file(options)
  return options[:options_file] if options[:options_file]
  LOCAL_OPTIONS_FILE
end

def options_file_as_erb_string(path)
  require 'erb'
  ERB.new(IO.read(path)).result(binding)
end

def parse_command_line_options
  options = Parser.parse!(@args)
  options[:files_or_directories_to_run] = @args
  options
end

def parse_env_options
  ENV["SPEC_OPTS"] ? Parser.parse!(ENV["SPEC_OPTS"].split) : {}
end

def parse_global_options
  parse_options_file(GLOBAL_OPTIONS_FILE)
end

def parse_local_options(options)
  parse_options_file(local_options_file(options))
end

def parse_options
  @options = begin
               command_line_options = parse_command_line_options
               local_options        = parse_local_options(command_line_options)
               global_options       = parse_global_options
               env_options          = parse_env_options
               [global_options, local_options, command_line_options, env_options].inject do |merged, options|
                 merged.merge(options)
               end
             end
end

def parse_options_file(path)
  Parser.parse(args_from_options_file(path))
end