add excerpts functionality using <!--more--> tag

app/models/post.rb

@@ -12,4 +12,16 @@ def to_param
   def external?
   	!url.blank?
   end
+
+  def has_more_tag
+    content =~ /<!--\s*more\s*-->/i ? true : false
+  end
+
+  def excerpt
+    if content.index(/<!--\s*more\s*-->/i)
+      content.split(/<!--\s*more\s*-->/i)[0]
+    else
+      content
+    end
+  end
 end

app/views/posts/_post.html.erb

@@ -9,7 +9,12 @@
       <h1><% if @single_post %><%= post.title %><% else %><%= link_to post.title, post.slug %><% end %></h1>
     <%- end -%>
 
-    <% if post.content %><%= markdown(post.content).to_html.html_safe %><% end %>
+    <% if post.has_more_tag && !@single_post %>
+      <% if post.excerpt %><%= markdown(post.excerpt).to_html.html_safe %><% end %>
+	  <%= link_to "Read More", post.slug, :class => "button" %>
+    <% else %>
+      <% if post.content %><%= markdown(post.content).to_html.html_safe %><% end %>
+    <% end %>
 
     <%- if is_admin? -%>
       <ul class="actions">