Radius — Powerful Tag-Based Templates

Radius is a powerful tag-based template language for Ruby inspired by the template languages used in MovableType and TextPattern. It uses tags similar to XML, but can be used to generate any form of plain text (HTML, e-mail, etc…).

Example

With Radius, it is extremely easy to create custom tags and parse them. Here’s a small example:

  require 'radius'

  # Define tags on a context that will be available to a template:
  context = Radius::Context.new do |c|
    c.define_tag 'hello' do
      'Hello world'
    end
    c.define_tag 'repeat' do |tag|
      number = (tag.attr['times'] || '1').to_i
      result = ''
      number.times { result << tag.expand }
      result
    end
  end

  # Create a parser to parse tags that begin with 'r:'
  parser = Radius::Parser.new(context, :tag_prefix => 'r')

  # Parse tags and output the result
  puts parser.parse(%{A small example:\n<r:repeat times="3">* <r:hello />!\n</r:repeat>})

Output:

  A small example:
  * Hello world!
  * Hello world!
  * Hello world!

Quick Start

Read the QUICKSTART to get up and running fast with Radius.

Download

The latest version of Radius can be found on RubyForge:

rubyforge.org/projects/radius/

Installation

It is recommended that you install Radius using the RubyGems packaging system:

  % gem install --remote radius

You can also install Radius by copying lib/radius.rb into the Ruby load path.

License

Radius is free software and may be redistributed under the terms of the MIT-LICENSE:

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

The Future

Radius is nearing completion, but is still very much in the development stages. Take a look at the ROADMAP to see where we want to go.

If you are interested in helping with the development of Radiant, contact me and we’ll talk.

Enjoy!

— John Long :: wiseheartdesign.com