Initial commit

app/decorators/posts/decorator.rb

@@ -0,0 +1,73 @@
+# frozen_string_literal: false
+
+# auto_register: false
+
+require "rexml/parsers/pullparser"
+
+module Adamantium
+  module Decorators
+    module Posts
+      class Decorator < SimpleDelegator
+        def prefix_emoji
+          name ? "📝" : "📯"
+        end
+
+        def display_title
+          title = name || published_at.strftime("%D")
+          "#{prefix_emoji} #{title}"
+        end
+
+        def display_published_at
+          published_at.strftime("%e %B, %Y")
+        end
+
+        def machine_published_at
+          published_at.rfc2822
+        end
+
+        def excerpt
+          truncate_html(content, 140, true)
+        end
+
+        private
+
+        def truncate_html(content, len = 30, at_end = nil)
+          p = REXML::Parsers::PullParser.new(content)
+          tags = []
+          new_len = len
+          results = ""
+          while p.has_next? && new_len > 0
+            p_e = p.pull
+            case p_e.event_type
+            when :start_element
+              tags.push p_e[0]
+              results << "<#{tags.last}#{attrs_to_s(p_e[1])}>"
+            when :end_element
+              results << "</#{tags.pop}>"
+            when :text
+              results << p_e[0][0..new_len]
+              new_len -= p_e[0].length
+            else
+              results << "<!-- #{p_e.inspect} -->"
+            end
+          end
+          if at_end
+            results << "..."
+          end
+          tags.reverse_each do |tag|
+            results << "</#{tag}>"
+          end
+          results
+        end
+
+        def attrs_to_s(attrs)
+          if attrs.empty?
+            ""
+          else
+            " " + attrs.to_a.map { |attr| %(#{attr[0]}="#{attr[1]}") }.join(" ")
+          end
+        end
+      end
+    end
+  end
+end