= RedCloth - Textile parser for Ruby

Homepage::  https://github.com/jgarber/redcloth
Maintainer:: Helio Cola https://github.com/heliocola
Author::    Jason Garber
Copyright:: (c) 2011 Jason Garber
License::   MIT

{rdoc-image:https://codeclimate.com/github/jgarber/redcloth/badges/gpa.svg}[https://codeclimate.com/github/jgarber/redcloth]

= RedCloth

RedCloth is a Ruby library for converting Textile into HTML.

== Attention - Deprecating JRuby and Windows support in version 4.3

In order to prioritize merging a fix for the long standing vulnerability *CVE-2012-6684*, our {new maintainer}[https://github.com/joshuasiler] has elected to stop maintaining the precompiled versions for Windows and JRuby. 

== Installing

RedCloth can be installed via RubyGems:

  gem install RedCloth

== Compiling

If you just want to use RedCloth, you do NOT need to build/compile it. It is
compiled from C sources automatically when you install the gem on the ruby
platform. Precompiled binary gems are provided for JRuby and Win32 platforms prior to version 4.3.

RedCloth can be compiled with <tt>rake compile</tt>. Ragel 6.3 or greater is
required. Again, Ragel is NOT needed to simply use RedCloth.

=== Supported platforms

By default, the rake compile task builds a native C extension (MRI 1.8 or 1.9). A pure Ruby version can also be generated, but it's super slow and Ruby 1.8-only, and doesn't
support multi-byte characters. 

The RedCloth::EXTENSION_LANGUAGE constant indicates in which language your
copy of RedCloth is compiled.

== Bugs

Please submit bugs as issues to this repo.

== Using RedCloth

RedCloth is simply an extension of the String class that can handle
Textile formatting.  Use it like a String and output HTML with its
RedCloth#to_html method.

Simple use:
 text = "This is *my* text."
 RedCloth.new(text).to_html

Multi-line example:

 doc = RedCloth.new <<EOD
 h2. Test document

 Just a simple test.
 EOD
 puts doc.to_html


== What is Textile?

Textile is a simple formatting style for text
documents, loosely based on some HTML conventions.

== Sample Textile Text

 h2. This is a title

 h3. This is a subhead

 This is a bit of paragraph.

 bq. This is a blockquote.

= Writing Textile

A Textile document consists of paragraphs.  Paragraphs
can be specially formatted by adding a small instruction
to the beginning of the paragraph.

 h3.     Header 3.
 bq.     Blockquote.
 #       Numeric list.
 *       Bulleted list.

== Quick Phrase Modifiers

Quick phrase modifiers are also included, to allow formatting
of small portions of text within a paragraph.

 _emphasis_
 __italicized__
 *strong*
 **bold**
 ??citation??
 -deleted text-
 +inserted text+
 ^superscript^
 ~subscript~
 @code@
 %(classname)span%

 ==notextile== (leave text alone)

== Links

To make a hypertext link, put the link text in "quotation
marks" followed immediately by a colon and the URL of the link.

Optional: text in (parentheses) following the link text,
but before the closing quotation mark, will become a title
attribute for the link, visible as a tool tip when a cursor is above it.

Example:

 "This is a link (This is a title)":http://www.textism.com

Will become:

 <a href="http://www.textism.com" title="This is a title">This is a link</a>

== Images

To insert an image, put the URL for the image inside exclamation marks.

Optional: text that immediately follows the URL in (parentheses) will
be used as the Alt text for the image. Images on the web should always
have descriptive Alt text for the benefit of readers using non-graphical
browsers.

Optional: place a colon followed by a URL immediately after the
closing ! to make the image into a link.

Example:

 !http://www.textism.com/common/textist.gif(Textist)!

Will become:

 <img src="http://www.textism.com/common/textist.gif" alt="Textist" />

With a link:

 !/common/textist.gif(Textist)!:http://textism.com

Will become:

 <a href="http://textism.com"><img src="/common/textist.gif" alt="Textist" /></a>

== Defining Acronyms

HTML allows authors to define acronyms via the tag. The definition appears as a
tool tip when a cursor hovers over the acronym. A crucial aid to clear writing,
this should be used at least once for each acronym in documents where they appear.

To quickly define an acronym in Textile, place the full text in (parentheses)
immediately following the acronym.

Example:

 ACLU(American Civil Liberties Union)

Will become:

 <acronym title="American Civil Liberties Union">ACLU</acronym>
 
== Filtering HTML

RedCloth doesn't filter unsafe html tags by default, do to this use the following syntax:
  RedCloth.new("<script>alert(1)</script>", [:filter_html]).to_html
which will filter the script tags from the HTML resulting in:
  "&lt;script&gt;alert(1)&lt;/script&gt;"

== Adding Tables

In Textile, simple tables can be added by separating each column by
a pipe.

    |a|simple|table|row|
    |And|Another|table|row|

Styles are applied with curly braces.

    table{border:1px solid black}.
    {background:#ddd;color:red}. |a|red|row|
