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module CodeRay

  # A little hack to enable CodeRay highlighting in RedCloth.

  # 

  # Usage:

  #  require 'coderay'

  #  require 'coderay/for_redcloth'

  #  RedCloth.new('@[ruby]puts "Hello, World!"@').to_html

  # 

  # Make sure you have RedCloth 4.0.3 activated, for example by calling

  #  require 'rubygems'

  # before RedCloth is loaded and before calling CodeRay.for_redcloth.

  module ForRedCloth

    def self.install

      gem 'RedCloth', '>= 4.0.3' if defined? gem

      require 'redcloth'

      unless RedCloth::VERSION.to_s >= '4.0.3'

        if defined? gem

          raise 'CodeRay.for_redcloth needs RedCloth version 4.0.3 or later. ' +

            "You have #{RedCloth::VERSION}. Please gem install RedCloth."

        else

          $".delete 'redcloth.rb'  # sorry, but it works

          require 'rubygems'

          return install  # retry

        end

      end

      unless RedCloth::VERSION.to_s >= '4.2.2'

        warn 'CodeRay.for_redcloth works best with RedCloth version 4.2.2 or later.'

      end

      RedCloth::TextileDoc.send :include, ForRedCloth::TextileDoc

      RedCloth::Formatters::HTML.module_eval do

        def unescape(html)

          replacements = {

            '&' => '&',

            '"' => '"',

            '>' => '>',

            '&lt;' => '<',

          }

          html.gsub(/&(?:amp|quot|[gl]t);/) { |entity| replacements[entity] }

        end

        undef code, bc_open, bc_close, escape_pre

        def code(opts)  # :nodoc:

          opts[:block] = true

          if !opts[:lang] && RedCloth::VERSION.to_s >= '4.2.0'

            # simulating pre-4.2 behavior

            if opts[:text].sub!(/\A\[(\w+)\]/, '')

              if CodeRay::Scanners[$1].plugin_id == 'plaintext'

                opts[:text] = $& + opts[:text]

              else

                opts[:lang] = $1

              end

            end

          end

          if opts[:lang] && !filter_coderay

            require 'coderay'

            @in_bc ||= nil

            format = @in_bc ? :div : :span

            opts[:text] = unescape(opts[:text]) unless @in_bc

            highlighted_code = CodeRay.encode opts[:text], opts[:lang], format, :stream => true

            highlighted_code.sub!(/\A<(span|div)/) { |m| m + pba(@in_bc || opts) }

            highlighted_code

          else

            "<code#{pba(opts)}>#{opts[:text]}</code>"

          end

        end

        def bc_open(opts)  # :nodoc:

          opts[:block] = true

          @in_bc = opts

          opts[:lang] ? '' : "<pre#{pba(opts)}>"

        end

        def bc_close(opts)  # :nodoc:

          opts = @in_bc

          @in_bc = nil

          opts[:lang] ? '' : "</pre>\n"

        end

        def escape_pre(text)

          if @in_bc ||= nil

            text

          else

            html_esc(text, :html_escape_preformatted)

          end

        end

      end

    end

    module TextileDoc  # :nodoc:

      attr_accessor :filter_coderay

    end

  end

end

CodeRay::ForRedCloth.install