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Doublesing is a wiki markup language based on TeX. It's very simple and extremely flexible. You can register your own tags (including over-riding builtin ones) to suit your needs, effectively allowing a custom dialect to be built with just ruby objects.


Add this line to your application's Gemfile:

gem 'doublesing'

And then execute:

$ bundle

Or install it yourself as:

$ gem install doublesing


Doublesing is a TeX-like language designed to be used for online markup. It takes the relatively simple form of:


Here, maybe a use case will help:

\bold[This text becomes bold!]


<b>This text becomes bold!</b>

You can have blocks that take multiple arguments:

\header[1][This is a header]
<h1>This is a header</h1>

Parsing this is easy:

Doublesing.setup! # Must call once, probably in an initializer
Doublesing.parse(str) #=> Processed HTML

Where it gets interesting is the fact that you can register your own block types. A common use case of this might be to add site-specific functionality. Let's say you're making a website about pictures of famous dogs. You probably want your user to be able to reference dogs pretty quickly. Well, with Doublesing, you can do something like:

class DogFinder
  def initialize(args)
    @dog_name = args.first
    @body = args[1]

  def find_dog
    dog = Dog.where(name: @dog_name).pluck(:id).first

  def to_s
    "<a href=\"#{find_dog}\">#{@body.to_s}</a>"

Then, register it:

Doublesing.register("dog", DogFinder)

Now, assuming you're using Doublesing to parse comments, a user can say:

\dog[Rowlf][My favorite musical dog!]

To easily get a link to the page on the piano player of the Muppets. Pretty neat, huh?

Run rake specification to generate a .pdf with the full specification of built-in blocks.

There aren't that many right now, but you're free to submit a pull request with one! Note: You gotta have PDFLatex installed for that to work.


  1. Fork it ( )
  2. Create your feature branch (git checkout -b my-new-feature)
  3. Commit your changes (git commit -am 'Add some feature')
  4. Push to the branch (git push origin my-new-feature)
  5. Create a new Pull Request