post histories finished

app/presenters/post_history_presenter.rb

@@ -1,19 +0,0 @@
-class PostHistoryPresenter < Presenter
-  attr_reader :revision
-  
-  def initialize(revision)
-    @revision = revision
-  end
-  
-  def changes
-    
-  end
-  
-  def updated_at
-    revision["updated_at"]
-  end
-  
-  def updater_name
-    User.id_to_name(revision["user_id"].to_i)
-  end
-end

app/presenters/post_history_revision_presenter.rb

@@ -0,0 +1,25 @@
+class PostHistoryRevisionPresenter < Presenter
+  attr_reader :revision
+  
+  def initialize(revision)
+    @revision = revision
+  end
+  
+  def changes
+    html =  []
+    html << revision.diff[:del].map {|x| "<del>#{h(x)}</del>"}
+    html << revision.diff[:add].map {|x| "<ins>#{h(x)}</ins>"}
+    html << "<ins>source:#{h(revision.diff[:source])}</ins>" if revision.diff[:source].present?
+    html << "<ins>rating:#{h(revision.diff[:rating])}</ins>" if revision.diff[:rating].present?
+    html << "<ins>parent:#{revision.diff[:parent_id]}</ins>" if revision.diff[:parent_id].present?
+    html.join(" ").html_safe
+  end
+  
+  def updated_at
+    Time.parse(revision.updated_at)
+  end
+  
+  def updater_name
+    User.id_to_name(revision.user_id)
+  end
+end

app/presenters/post_presenter.rb

@@ -10,6 +10,7 @@ class PostPresenter < Presenter
     html << %{<img src="#{post.preview_file_url}">}
     html << %{</a>}
     html << %{</article>}
+    html.html_safe
   end
   
   def initialize(post)

app/presenters/presenter.rb

@@ -1,4 +1,12 @@
 class Presenter
+  def self.h(s)
+    CGI.escapeHTML(s)
+  end
+  
+  def self.u(s)
+    URI.escape(s)
+  end
+  
   def h(s)
     CGI.escapeHTML(s)
   end