lukas2/gist:4642666

## gistfile1.rb
require 'rubygems'
require 'action_view'
require 'erb'

class MetadataHelper

  include ActionView::Helpers::TagHelper

  def initialize( opts = {} )
    @title        = opts[:title]
    @url          = opts[:url]
    @description  = opts[:description]
    @image_url    = opts[:image_url] || opts[:image]
    @author       = opts[:author]
    @type         = opts[:type]
  end

  def twitter_card
    Array.new.tap do |arr|
      arr << mtag( 'twitter:card', 'summary' )
      arr << mtag( 'twitter:url',  @url )
      arr << mtag( 'twitter:title', @title )
      arr << mtag( 'twitter:description', @description )
      arr << mtag( 'twitter:image', @image_url )
      arr << mtag( 'twitter:author', @author )
    end.compact
  end

  def open_graph
    Array.new.tap do |arr|
      arr << mtag( 'og:type', @type )
      arr << mtag( 'og:url',  @url )
      arr << mtag( 'og:title', @title )
      arr << mtag( 'og:description', @description )
      arr << mtag( 'og:image', @image_url )
    end.compact
  end

  def all
    [ twitter_card, open_graph ].flatten.join( "\n" )
  end

  private

  def mtag( name, content )
    tag( :meta, { name: name, content: content }, false, false ) if name && content
  end

end

template = ERB.new <<EOS
<!DOCTYPE HTML>
<html>
  <head>
    <%= helper.all %>
  </head>
  <body>
    <p>Hello people!</p>
  </body>
</html>
EOS

helper = MetadataHelper.new( {
  title:        'Test',
  url:          'http://www.lukaszielinski.de',
  description:  'Just testing',
  type:         'article',
  author:       '@lukaszielinski',
  image:        'http://mugs.mugbug.co.uk/500/mb.i_love_html_red_love_heart.coaster.jpg'
} )

puts template.result( binding )
	require 'rubygems'
	require 'action_view'
	require 'erb'

	class MetadataHelper

	include ActionView::Helpers::TagHelper

	def initialize( opts = {} )
	@title = opts[:title]
	@url = opts[:url]
	@description = opts[:description]
	@image_url = opts[:image_url] \|\| opts[:image]
	@author = opts[:author]
	@type = opts[:type]
	end

	def twitter_card
	Array.new.tap do \|arr\|
	arr << mtag( 'twitter:card', 'summary' )
	arr << mtag( 'twitter:url', @url )
	arr << mtag( 'twitter:title', @title )
	arr << mtag( 'twitter:description', @description )
	arr << mtag( 'twitter:image', @image_url )
	arr << mtag( 'twitter:author', @author )
	end.compact
	end

	def open_graph
	Array.new.tap do \|arr\|
	arr << mtag( 'og:type', @type )
	arr << mtag( 'og:url', @url )
	arr << mtag( 'og:title', @title )
	arr << mtag( 'og:description', @description )
	arr << mtag( 'og:image', @image_url )
	end.compact
	end

	def all
	[ twitter_card, open_graph ].flatten.join( "\n" )
	end

	private

	def mtag( name, content )
	tag( :meta, { name: name, content: content }, false, false ) if name && content
	end

	end

	template = ERB.new <<EOS
	<!DOCTYPE HTML>
	<html>
	<head>
	<%= helper.all %>
	</head>
	<body>
	<p>Hello people!</p>
	</body>
	</html>
	EOS

	helper = MetadataHelper.new( {
	title: 'Test',
	url: 'http://www.lukaszielinski.de',
	description: 'Just testing',
	type: 'article',
	author: '@lukaszielinski',
	image: 'http://mugs.mugbug.co.uk/500/mb.i_love_html_red_love_heart.coaster.jpg'
	} )

	puts template.result( binding )