Module: CodeRay::ForRedCloth

Defined in:
lib/coderay/for_redcloth.rb

Overview

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.

Defined Under Namespace

Modules: TextileDoc

Class Method Summary collapse

Class Method Details

.install ⇒ Object 



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# File 'lib/coderay/for_redcloth.rb', line 15

def self.install
  gem 'RedCloth', '>= 4.0.3' rescue nil
  require 'redcloth'
  unless RedCloth::VERSION.to_s >= '4.0.3'
    raise 'CodeRay.for_redcloth needs RedCloth version 4.0.3 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