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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) # :nodoc:
replacements = {
'&' => '&',
'"' => '"',
'>' => '>',
'<' => '<',
}
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].lang == :text
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
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) # :nodoc:
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
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