dir = File.dirname(__FILE__)
$LOAD_PATH.unshift dir unless $LOAD_PATH.include?(dir)

require 'sass/version'

# The module that contains everything Sass-related:
#
# * {Sass::Engine} is the class used to render Sass/SCSS within Ruby code.
# * {Sass::Plugin} is interfaces with web frameworks (Rails and Merb in particular).
# * {Sass::SyntaxError} is raised when Sass encounters an error.
# * {Sass::CSS} handles conversion of CSS to Sass.
#
# Also see the {file:SASS_REFERENCE.md full Sass reference}.
module Sass
  class << self
    # @private
    attr_accessor :tests_running
  end

  # The global load paths for Sass files. This is meant for plugins and
  # libraries to register the paths to their Sass stylesheets to that they may
  # be `@imported`. This load path is used by every instance of {Sass::Engine}.
  # They are lower-precedence than any load paths passed in via the
  # {file:SASS_REFERENCE.md#load_paths-option `:load_paths` option}.
  #
  # If the `SASS_PATH` environment variable is set,
  # the initial value of `load_paths` will be initialized based on that.
  # The variable should be a colon-separated list of path names
  # (semicolon-separated on Windows).
  #
  # Note that files on the global load path are never compiled to CSS
  # themselves, even if they aren't partials. They exist only to be imported.
  #
  # @example
  #   Sass.load_paths << File.dirname(__FILE__ + '/sass')
  # @return [Array<String, Pathname, Sass::Importers::Base>]
  def self.load_paths
    @load_paths ||= if ENV['SASS_PATH']
                      ENV['SASS_PATH'].split(Sass::Util.windows? ? ';' : ':')
                    else
                      []
                    end
  end

  # Compile a Sass or SCSS string to CSS.
  # Defaults to SCSS.
  #
  # @param contents [String] The contents of the Sass file.
  # @param options [{Symbol => Object}] An options hash;
  #   see {file:SASS_REFERENCE.md#sass_options the Sass options documentation}
  # @raise [Sass::SyntaxError] if there's an error in the document
  # @raise [Encoding::UndefinedConversionError] if the source encoding
  #   cannot be converted to UTF-8
  # @raise [ArgumentError] if the document uses an unknown encoding with `@charset`
  def self.compile(contents, options = {})
    options[:syntax] ||= :scss
    Engine.new(contents, options).to_css
  end

  # Compile a file on disk to CSS.
  #
  # @raise [Sass::SyntaxError] if there's an error in the document
  # @raise [Encoding::UndefinedConversionError] if the source encoding
  #   cannot be converted to UTF-8
  # @raise [ArgumentError] if the document uses an unknown encoding with `@charset`
  #
  # @overload compile_file(filename, options = {})
  #   Return the compiled CSS rather than writing it to a file.
  #
  #   @param filename [String] The path to the Sass, SCSS, or CSS file on disk.
  #   @param options [{Symbol => Object}] An options hash;
  #     see {file:SASS_REFERENCE.md#sass_options the Sass options documentation}
  #   @return [String] The compiled CSS.
  #
  # @overload compile_file(filename, css_filename, options = {})
  #   Write the compiled CSS to a file.
  #
  #   @param filename [String] The path to the Sass, SCSS, or CSS file on disk.
  #   @param options [{Symbol => Object}] An options hash;
  #     see {file:SASS_REFERENCE.md#sass_options the Sass options documentation}
  #   @param css_filename [String] The location to which to write the compiled CSS.
  def self.compile_file(filename, *args)
    options = args.last.is_a?(Hash) ? args.pop : {}
    css_filename = args.shift
    result = Sass::Engine.for_file(filename, options).render
    if css_filename
      options[:css_filename] ||= css_filename
      open(css_filename, "w") {|css_file| css_file.write(result)}
      nil
    else
      result
    end
  end
end

require 'sass/logger'
require 'sass/util'

require 'sass/engine'
require 'sass/plugin' if defined?(Merb::Plugins)
require 'sass/railtie'
require 'sass/features'
