# 
# = Rails Title Helper
#
# Provides helpers for managing page title.
#
# Category::    Rails
# Package::     Helpers
# Author::      Simone Carletti <weppos@weppos.net>
# Copyright::   2007-2008 The Authors
# License::     MIT License
# Link::        http://www.simonecarletti.com/
# Source::      http://gist.github.com/2769
# 
module TitleHelper
 
  #
  # = Title Helper
  #
  # This helper provides both input and output capabilities.
  # When called with +args+, it stores all args for later retrieval.
  # Additionally, it always return a formatted title
  # thus is can be easily called without arguments 
  # to display the full page title.
  # 
  # You can pass some additional options to customize the behavior
  # of the output string.
  # The following options are supported:
  # 
  # [<tt>:separator</tt>]
  #   the separator used to separe all elements of the title,
  #   by default a dash.
  # 
  # [<tt>:site</tt>]
  #   the name of the site to be appended to the page title.
  # 
  # [<tt>:headline</tt>]
  #   website headline to be appended to the page title,
  #   after any element.
  # 
  # === Examples
  # 
  #   # in a template set the title of the page
  #   <h1><%= title "Latest news" %></h1>
  #   # => <h1>Latest news</h1>
  # 
  #   # in the layout print the title of the page
  #   # with the name of the site
  #   <title><%= title :site => 'My Site' %></title>
  #   # => <title>Latest news | My Site</title>
  #
  #
  def title(*args)
    @title_helper_title ||= []
    @title_helper_title_options ||= {
      :separator => ' - ',
      :headline  => nil,
      :site      => nil,
    }
    options = args.extract_options!
 
    @title_helper_title += args
    @title_helper_title_options.merge!(options)
    
    t =  @title_helper_title.clone
    t << @title_helper_title_options[:site]
    t << @title_helper_title_options[:headline]
    t.compact.join(@title_helper_title_options[:separator])
  end
 
end
 

require 'test/unit'
require 'rubygems'
require 'active_support'
require 'title_helper'
 
 
class TitleHelperTest < Test::Unit::TestCase
  include TitleHelper
  
  def setup
    reset!
  end
  
  def test_title_should_accepts_zero_or_more_params
    assert_nothing_raised { title }
    assert_nothing_raised { title('One') }
    assert_nothing_raised { title('One', 'Two', 'Three') }
  end
  
  def test_title_should_return_content
    assert_equal('', title)
    assert_equal('One', title('One'))
  end
  
  def test_title_should_return_empty_string_if_empty
    assert_equal('', title)
  end
  
  def test_title_should_store_content
    assert_equal('', title)
    assert_equal('One', title('One'))
    assert_equal('One', title)
  end
  
  def test_title_should_join_content
    assert_equal('', title)
    assert_equal('One', title('One'))
    assert_equal('One - Two', title('Two'))
    assert_equal('One - Two - Three - Four', title('Three', 'Four'))
  end
  
  def test_title_should_join_content_with_separator
    assert_equal('One - Two', title('One', 'Two'))
    assert_equal('One | Two', title(:separator => ' | '))
    assert_equal('One x Two x Three', title('Three', :separator => ' x '))
  end
  
  def test_title_should_append_headline_to_content
    assert_equal('One - Two', title('One', 'Two'))
    assert_equal('One - Two - Cool!', title(:headline => 'Cool!'))
    assert_equal('One - Two - Three - Yeah!', title('Three', :headline => 'Yeah!'))
  end
  
  def test_title_should_append_site_to_content
    assert_equal('One - Two', title('One', 'Two'))
    assert_equal('One - Two - Cool!', title(:site => 'Cool!'))
    assert_equal('One - Two - Three - Yeah!', title('Three', :site => 'Yeah!'))
  end
  
  def test_title_should_append_site_then_headline
    assert_equal('One - Two', title('One', 'Two'))
    assert_equal('One - Two - Cool!', title(:site => 'Cool!'))
    assert_equal('One - Two - Cool! - Yeah!', title(:headline => 'Yeah!'))
  end
  
  
  protected
  
    def reset!
      title(nil)
    end
  
end