Rails Twitter Intent Helper

twintents.rb

# Demonstrate helper for rendering twitter intents
#
# Usage:
#
#    Twitter::Intents.tweet(
#      :text => 'Hello, world!', 
#      :via => 'rjzaworski', 
#      :url => 'https://gist.github.com/gists/4012584'
#    )
#
# refer to https://dev.twitter.com/docs/intents
module Twitter

  # Represent an intent
  class Intent

    # Assign an endpoint and options to this intent
    def initialize(endpoint, opts)
      @endpoint = endpoint
      @opts = opts
    end

    # Render the intent according to the requested style.
    # The style name will be used to call an appropriate
    # rendering method, following +render_as_STYLE()+
    def render(style)
      params = []
      @opts.each { |key, value| params << "#{key}=#{URI::encode(value)}" }
      send("render_as_#{style}", "https://twitter.com/intent/#{@endpoint}?" + params.join('&')).html_safe
    end

  protected
    
    # Provide default renderer
    def render_as_default(intent)
      caption = @opts.key?(:caption) ? @opts[:caption] : 'Tweet this'
      '<a href="' + intent + '">' + caption + '</a>'
    end

    # Provide alternate "mini" renderer
    # Renderers can be anything!
    def render_as_share_mini(intent)
      '<a href="' + intent + '"><i class="icon icon-twitter" style="background:url(/img/icons/16/twitter.png) 0 0;"></i> Twitter</a>'
    end
  end

  # Expose builder methods for +Twitter::Intent+
  module Intents

    # tweet intent
    def self.tweet(opts, style = 'default')

      options = {
        :url      => '',
        :via      => '',
        :text     => '',
        :hashtags => ''
      }.merge(opts)

      return Intent.new('tweet', opts).render(style)
    end

    # follow intent
    def self.follow(opts, style = 'default')
      options = {
        :screen_name => '',
        :user_id     => ''
      }.merge(opts)

      return Intent.new('follow', opts).render(style)
    end
  end
end