class RSpec::Core::ConfigurationOptions

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

def command_line_options
  @command_line_options ||= Parser.parse!(@args).merge :files_or_directories_to_run => @args
end

def configure(config)
  keys = order(options.keys, :libs, :requires, :default_path, :pattern)
  formatters = options[:formatters] if keys.delete(:formatters)
  config.exclusion_filter.merge! options[:exclusion_filter] if keys.delete(:exclusion_filter)
  keys.each do |key|
    config.send("#{key}=", options[key]) if config.respond_to?("#{key}=")
  end
  formatters.each {|pair| config.add_formatter(*pair) } if formatters
end

def custom_options
  options_from(custom_options_file)
end

def custom_options_file
  command_line_options[:custom_options_file]
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 << "--options"      << options[:custom_options_file]     if options[:custom_options_file]
  if options[:full_description]
    # The argument to --example is regexp-escaped before being stuffed
    # into a regexp when received for the first time (see OptionParser).
    # Hence, merely grabbing the source of this regexp will retain the
    # backslashes, so we must remove them.
    argv << "--example" << options[:full_description].source.delete('\\')
  end
  if options[:line_numbers]
    argv += options[:line_numbers].inject([]){|a,l| a << "--line_number" << l}
  end
  if options[:filter]
    options[:filter].each_pair do |k, v|
      argv << "--tag" << k.to_s
    end
  end
  if options[:exclusion_filter]
    options[:exclusion_filter].each_pair do |k, v|
      argv << "--tag" << "~#{k.to_s}"
    end
  end
  if options[:formatters]
    options[:formatters].each do |pair|
      argv << "--format" << pair[0]
      argv << "--out" << pair[1] if pair[1]
    end
  end
  (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 env_options
  ENV["SPEC_OPTS"] ? Parser.parse!(ENV["SPEC_OPTS"].split) : {}
end

def file_options
  custom_options_file ? custom_options : global_options.merge(local_options)
end

def global_options
  @global_options ||= options_from(global_options_file)
end

def global_options_file
  begin
    File.join(File.expand_path("~"), ".rspec")
  rescue ArgumentError
    warn "Unable to find ~/.rspec because the HOME environment variable is not set"
    nil
  end
end

def initialize(args)
  @args = args
end

def local_options
  @local_options ||= options_from(local_options_file)
end

def local_options_file
  ".rspec"
end

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

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

def order(keys, *ordered)
  ordered.reverse.each do |key|
    keys.unshift(key) if keys.delete(key)
  end
  keys
end

def parse_options
  @options ||= [file_options, command_line_options, env_options].inject {|merged, o| merged.merge o}
end