feat(): conditional render tag

lib/comfortable_mexican_sofa/content.rb

@@ -29,3 +29,4 @@ module ComfortableMexicanSofa::Content
 require_relative "content/tags/helper"
 require_relative "content/tags/partial"
 require_relative "content/tags/template"
+require_relative "content/tags/conditional_render"

lib/comfortable_mexican_sofa/content/tags/conditional_render.rb

@@ -0,0 +1,35 @@
+# Renders image tag from http://picsum.photos
+# Example: {{cms:lorem_picsum 400, 300}}
+class ComfortableMexicanSofa::Content::Tag::ConditionalRender < ComfortableMexicanSofa::Content::Tag
+
+    attr_reader :condition, :if_identifier, :else_identifier
+
+    def initialize(context:, params: [], source: "")
+      super
+      @condition = params[0]
+      @if_identifier  = params[1]
+      @else_identifier = params[2]
+
+      unless @if_identifier.present?
+        raise Error, "Need at least one dimension of the image"
+      end
+    end
+
+    def content
+      if condition
+        snippet(if_identifier).content
+      elsif else_identifier.present?
+        snippet(else_identifier).content
+      end
+    end
+
+    # Grabbing or initializing Comfy::Cms::Snippet object
+    def snippet(identifier)
+      context.site.snippets.detect { |s| s.identifier == identifier } ||
+        context.site.snippets.build(identifier: identifier)
+    end
+  end
+
+  ComfortableMexicanSofa::Content::Renderer.register_tag(
+    :conditional_render, ComfortableMexicanSofa::Content::Tag::ConditionalRender
+  )