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@@ -3,7 +3,7 @@
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 </h5>
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 <p><a href="#comment-form">Leave a response</a></p>
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 <ol class="comments" id="comments">
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-<!-- Put this in a partial -->
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+<!-- Put this in a partial. Actually I think we should reopen the article model, and stick in has_many :comments. do that. -- Mike -->
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 <% Comment.all_for_post(@article.id).each do |comment| %>
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   <li id="comment-<%= comment.id %>" class="comment">
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     <div class="author">

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@@ -1,2 +1,2 @@
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-<%= link_to "#{Comment.all_for_post(article.id, :count)} comments", article.permalink, :anchor => "comments" %><br />
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+<%= link_to "#{Comment.all_for_post(article.id, :count)} comments", article.permalink, :anchor => "comments" %>

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@@ -1 +1,2 @@
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+
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@@ -1 +1,11 @@
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+class Tags < Application
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+  # TODO: Make a base plugin controller that has this in it. 
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+  include_plugin_views __FILE__
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+  
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+  def show(id)
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+    @tag = Tag.first(:name => id)
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+    display @tag
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+  end
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+  
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+end

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@@ -1 +1,27 @@
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+require File.join(File.join(File.dirname(__FILE__), "controllers"), "tags")
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+require File.join(File.join(File.dirname(__FILE__), "models"), "tag")
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+require File.join(File.join(File.dirname(__FILE__), "models"), "tagging")
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+
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+# This reopens the article class, and adds a bunch of tagging support code.
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+require File.join(File.join(File.dirname(__FILE__), "lib"), "article")
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+# This reopens the global_helpers module, and adds the tag cloud stuff.
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+require File.join(File.join(File.dirname(__FILE__), "lib"), "global_helpers")
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+
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+
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+# Failing out atm
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+# Hooks::Events.register_event(:after_create_article) do |article|
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+#   article.create_tags
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+# end
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+
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+Merb::Router.prepend do |r|
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+  r.match('/tags/:id').to(:controller => 'tags', :action =>'show').name(:tag)
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+end
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+
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+Hooks::View.register_view do
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+  [
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+    { :name => "article_form_fields", :partial => "tag_field" },
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+    { :name => "meta_section", :partial => "tag_list" }
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+    { :name => "sidebar", :partial => "tag_could" }
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+  ]
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+end

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@@ -1 +1,39 @@
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+# Reopen the article model and wang in the stuff we need. 
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+class Article
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+  # We define this tags attribute so when the form posts, the params for
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+  # tags get set, and we can subsequently access it later on.
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+  attr_accessor :tag_list
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+  
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+  has_many :taggings
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+  # Datamapper's version of has_many :through. Not quite as pretty, but it'll get the job done. Or not...
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+  # This is supposed to work but it just returns a #<DataMapper::Support::TypedSet[Tag]: {}>
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+  # has_and_belongs_to_many :tags,
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+  #   :join_table => "taggings",
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+  #   :left_foreign_key => "article_id",
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+  #   :right_foreign_key => "tag_id",
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+  #   :class => "Tag"
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+      
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+  def create_tags
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+    return if @tag_list.nil? || @tag_list.empty?
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+    # Wax all the existing taggings.
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+    self.taggings.each {|t| t.destroy! }
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+    @tag_list.split(",").each do |t|
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+      unless t.empty?
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+        # Hmm, can we do transactions with DM? I'm sure there's a way.
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+        tag = Tag.create(:name => t.strip) 
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+        Tagging.create(:article_id => self.id, :tag_id => tag.id)
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+      end
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+    end
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+  end
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+  
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+  after_save do |article|
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+    article.create_tags
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+  end
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+  
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+  # This is probably slower than habtm, but that's not working as stated above.
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+  def tags
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+    taggings.map { |tagging| tagging.tag.name }.join(", ")
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+  end
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+    
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+end

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@@ -1 +1,18 @@
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+module Merb
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+  module GlobalHelpers
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+    
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+    def tag_cloud(tags, classes)
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+      max, min = 0, 0
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+      tags.each do |t|
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+        max = t.count.to_i if t.count.to_i > max
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+        min = t.count.to_i if t.count.to_i < min
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+      end
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+      divisor = ((max - min) / classes.size) + 1
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+      tags.each do |t|
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+        yield t.name, classes[(t.count.to_i - min) / divisor]
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+      end
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+    end
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+  end
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+  
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+end

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@@ -1 +1,17 @@
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+plugin:
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+    name: feather-tagging
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+    author: Michael Leung
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+    version: 1.0
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+    homepage: http://featherblog.com
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+    about: This plugin provides tag support to articles.
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+    contents:
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+        .:
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+            - init.rb
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+        controllers:
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+            .:
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+                - tags.rb
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+        models:
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+            .:
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+                - tag.rb
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+                - tagging.rb

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@@ -1 +1,15 @@
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+class Tag < DataMapper::Base
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+  property :name, :string
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+  has_and_belongs_to_many :taggings
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+
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+  # Has many through would be nice here.
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+  def articles
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+    Article.all(:id => taggings.map{|t| t.article_id }) # So tempted to use symbol to_proc but, it's slow. Damn.
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+  end
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+  
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+  def to_param
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+    name
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+  end
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+    
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+end

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@@ -1 +1,8 @@
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+class Tagging < DataMapper::Base
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+  property :article_id, :integer
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+  property :tag_id, :integer
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+  
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+  belongs_to :article
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+  belongs_to :tag
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+end

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@@ -1 +1,4 @@
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+<p>
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+  <%= text_control :tag_list, :size => 50, :value => @article.tags, :label => 'Tags (comma separated):' %>
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+</p>

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@@ -1 +1,4 @@
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+<% unless article.tags.empty? %>
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+  | tagged with: <%= article.taggings.collect { |tagging| link_to(tagging.tag.name, url(:tag, tagging.tag)) }.join(", ") %>
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+<% end %>

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@@ -1 +1,5 @@
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+<!-- We need a way to get these classes in the style sheet. -->
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+<% tag_cloud @tags, %w(tag1 tag2 tag3 tag4 tag5) do |name, css_class| %>
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+  <%= link_to(name, tag_path(name), :class => css_class) %>
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+<% end %>

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@@ -1 +1,14 @@
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+<% throw_content :title do %>
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+	Articles tagged with <%= @tag.name %>
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+<% end %>
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+
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+<h1>Articles Tagged with '<%= @tag.name %>'</h1>
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+
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+<!--  -->
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+
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+<% unless @tag.articles.empty? %>
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+  <%= partial('articles/article', :with => @tag.articles) %>
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+<% else %>
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+  No articles found for <%= @tag.name %>.
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+<% end %>