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RedCloth is a library that provides a Ruby implementation of the Textile markup language. The Textile markup language is a special way of formatting plain text to be converted into HTML.

Now that we have the integration test made, we can start implementing the thing for real. We first create a simple search form template. Save the following code in app/views/catalog/_ search_box.rhtml: <%= <%= <%= <%= form_tag({:action => "search"}, {:method => "get"}) %> text_field_tag :q %> submit_tag "Search" %> end_form_tag %>

Here s a demonstration of Textile, followed by the HTML that a Textile interpreter would generate from it:

scala> val p = new Putable[AnyRef]

h1. This is a heading. This is the first paragraph. This is the second paragraph. h1. Another heading h2. A second level heading Another paragraph

scala> writeOnly(p)

<h1>This is a heading.</h1> <p>This is the first paragraph.</p> <p>This is the second paragraph.</p> <h1>Another heading</h1> <h2>A second level heading</h2> <p>Another paragraph</p>

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Saving it as a partial makes it possible for us to easily embed the search form in other pages. In the code, we create a simple form that points to the search action and uses the get method. Using get instead of post will make the query string be a part of the URL. That way, Jill can circulate a link to her search results to all of her friends. Our form has only two elements: a text field q and the submit button. In the actual search template, we display the partial using the render method. Save the following line to app/views/catalog/search.rhtml: <%= render :partial => "search_box" %>

Textile provides a more human-friendly language that can be converted easily to HTML. RedCloth makes this functionality available in Ruby. RedCloth is available as a RubyGem and can be installed in the usual way (such as with gem install redcloth), or see 7 for more information. To use RedCloth, create an instance of the RedCloth class and pass in the Textile code you want to use:

Okay, so we can call a method that expects a Putable[String] with a Putable[AnyRef] because we are guaranteed to call the put method with a String, which is a subclass of AnyRef. Standing alone, this is not particularly valuable, but if we have a class that does something with input that results in output, the value of contravariance becomes obvious. The inputs to a transformation are contravariant. Calling something that expects at least any AnyRef with a String is legal and valid. But the return value can be covariant because we expect to get back a Number, so if we get an Integer, a subclass of Number, we re okay. Let s see how it works. We ll define DS with a contravariant In type and a covariant Out type:

require 'rubygems' require 'redcloth' text = %q{h1. This is a heading. This is the first paragraph. This is the second paragraph. h1. Another heading h2. A second level heading

The RedCloth class is a basic extension of the String class, so you can use regular string methods with RedCloth objects, or you can use the to_html method to convert the RedCloth/Textile document to HTML. The Textile language is a powerful markup language, but its syntax is beyond the scope of this chapter. It supports easy ways to convert plain text to complex HTML containing tables, HTML entities, images, and structural elements. To learn more about RedCloth and Textile, refer to the official RedCloth Web site at http://redcloth. rubyforge.org/.

scala> trait DS[-In, +Out]{def apply(i: In): Out}