lib/middleman-core/extensions/minify_css.rb
require 'middleman-core/contracts' # Minify CSS Extension class Middleman::Extensions::MinifyCss < ::Middleman::Extension option :inline, false, 'Whether to minify CSS inline within HTML files' option :ignore, [], 'Patterns to avoid minifying' option :compressor, proc { require 'sass' SassCompressor }, 'Set the CSS compressor to use.' def after_configuration # Setup Rack middleware to minify CSS app.use Rack, compressor: options[:compressor], ignore: Array(options[:ignore]) + [/\.min\./], inline: options[:inline] end class SassCompressor def self.compress(style, options={}) root_node = ::Sass::SCSS::CssParser.new(style, 'middleman-css-input', 1).parse root_node.options = options.merge(style: :compressed) root_node.render.strip end end # Rack middleware to look for CSS and compress it class Rack include Contracts INLINE_CSS_REGEX = /(<style[^>]*>\s*(?:\/\*<!\[CDATA\[\*\/\n)?)(.*?)((?:(?:\n\s*)?\/\*\]\]>\*\/)?\s*<\/style>)/m # Init # @param [Class] app # @param [Hash] options Contract RespondTo[:call], ({ ignore: ArrayOf[PATH_MATCHER], inline: Bool, compressor: Or[Proc, RespondTo[:to_proc], RespondTo[:compress]] }) => Any def initialize(app, options={}) @app = app @ignore = options.fetch(:ignore) @inline = options.fetch(:inline) @compressor = options.fetch(:compressor) @compressor = @compressor.to_proc if @compressor.respond_to? :to_proc @compressor = @compressor.call if @compressor.is_a? Proc end # Rack interface # @param [Rack::Environmemt] env # @return [Array] def call(env) status, headers, response = @app.call(env) if inline_html_content?(env['PATH_INFO']) minified = ::Middleman::Util.extract_response_text(response) minified.gsub!(INLINE_CSS_REGEX) do $1 << @compressor.compress($2) << $3 end headers['Content-Length'] = ::Rack::Utils.bytesize(minified).to_s response = [minified] elsif standalone_css_content?(env['PATH_INFO']) minified_css = @compressor.compress(::Middleman::Util.extract_response_text(response)) headers['Content-Length'] = ::Rack::Utils.bytesize(minified_css).to_s response = [minified_css] end [status, headers, response] end private Contract String => Bool def inline_html_content?(path) (path.end_with?('.html') || path.end_with?('.php')) && @inline end Contract String => Bool def standalone_css_content?(path) path.end_with?('.css') && @ignore.none? { |ignore| Middleman::Util.path_match(ignore, path) } end end end