Solid

Solid aim to provide a easier and nicer API to create custom Liquid tags and blocks

Tags

To create a new tag, you just have to:

• Extend Solid::Tag
• Define a display method
• Give a tag_name

class DummyTag < Solid::Tag

  tag_name :dummy # register in Liquid under the name of `dummy`

  def display
    'dummy !!!'
  end

end

<p>{% dummy %}<p>

Arguments

This is the simpliest tag ever but, Solid tags can receive rich arguments:

class TypeOfTag < Solid::Tag

  tag_name :typeof

  def display(*values)
    ''.tap do |output|
      values.each do |value|
        output << "<p>Type of #{value} is #{value.class.name}</p>"
      end
    end
  end

end

{% capture myvar %}eggspam{% endcapture %}
{% typeof "foo", 42, 4.2, myvar, myoption:"bar", otheroption:myvar %}
<!-- produce -->
<p>Type of "foo" is String</p>
<p>Type of 42 is Integer</p>
<p>Type of 4.2 is Float</p>
<p>Type of "eggspam" is String</p>
<p>Type of {:myoption=>"bar", :otheroption=>"eggspam"} is Hash</p>

Context attributes

If there is some "global variables" in your liquid context you can declare that your tag need to access it:

class HelloTag < Solid::Tag

  tag_name :hello

  context_attribute :current_user

  def display
    "Hello #{current_user.name} !"
  end

end

<p>{% hello %}</p>
<!-- produce -->
<p>Hello Homer</p>

Blocks

Block are just tags with a body. They perform the same argument parsing. To render the block body from it's display method you just have to yield:

class PBlock < Solid::Block

  tag_name :p

  def display(options)
    "<p class='#{options[:class]}'>#{yield}</p>"
  end

end

{% p class:"content" %}
  It works !
{% endp %}
<!-- produce -->
<p class="content">It works !</p>

Of course you are free to yield once, multiple times or even never.

Conditional Blocks

Conditional blocks are blocks with two bodies. If you yield true you will receive the main block and if you yield false you will receive the else block:

class IfAuthorizedToTag < Solid::ConditionalTag

  tag_name :if_authorized_to

  context_attribute :current_user

  def display(permission)
    yield(current_user.authorized_to?(permission))
  end

end

{% if_authorized_to "publish" %}
  You are authorized !
{% else %}
  Get out !
{% endif_authorized_to %}