Added ability to drop in other sets of pieces.

Select box on match to pick which of the available sets you are using.

File and Directory queries to determine available sets.

Current set name is stored in session[:set] and matches the name of the directory holding the set

app/controllers/sets_controller.rb

@@ -0,0 +1,9 @@
+# Manages the addition and updating of players and their information
+class SetsController < ApplicationController
+
+  def change
+    session[:set] = params[:set]
+    redirect_to :back
+  end
+
+end

app/helpers/matches_helper.rb

@@ -34,7 +34,21 @@ def square_color( pos )
     (pos[0] + pos[1]) % 2 == 1 ? :white : :black
   end
 
+  # checks for existance of .gif file in the current set's directory
+  # if no .gif, uses .png extension
   def image_source_of( piece )
-    "/images/sets/default/#{piece.role.to_s}_#{piece.side.to_s[0,1]}.gif"
+    session[:set] ||= 'default'
+    path = "/images/sets/#{session[:set]}/"
+    extension = gif_file_exists?(piece, path) ? ".gif" : ".png"
+    path + piece_file_name(piece) + extension
   end
+
+  def piece_file_name(piece)
+    "#{piece.role.to_s}_#{piece.side.to_s[0,1]}"
+  end
+
+  def gif_file_exists?(piece, path)
+    File.exists?( Rails.public_path + path + piece_file_name(piece) + ".gif" )
+  end
+
 end

app/helpers/sets_helper.rb

@@ -0,0 +1,9 @@
+module SetsHelper
+
+  def available_sets
+    Dir.glob("#{Rails.public_path}/images/sets/**").
+        select{|f| File.directory?( f) }.
+        map{|d| d.split("/").last}
+  end
+
+end

app/views/matches/show.html.erb

@@ -10,6 +10,10 @@ you can enter the Algebraic Notation ( Nbxc4 ). To castle drag king to its castl
 when you drop the piece or hit enter.
 </div>
 
+<div id="select_set_div" style=" ">
+<%= render :partial => "sets/select_set" %>
+</div>
+
 <div id="board_div" style="float:left">
 <%= render :partial => 'board', :locals => { :board => @match.board } %>
 </div>

app/views/sets/_select_set.html.erb

@@ -0,0 +1,6 @@
+<h3>Available Chess Sets</h3>
+<%- set = session[:set] || "default" %>
+<%- form_for :set, :url => {:controller => "sets", :action => "change"} do |f| %>
+    <%= select_tag "set", options_for_select(available_sets, set) %>
+    <%= submit_tag 'Change' %>
+<%- end %>

config/routes.rb

@@ -3,6 +3,7 @@
   #restful_authentication routes
   map.resources :players
   map.resource :session
+  map.resource :set, :member => {:change => :post}
 
   #our application routes  
   map.resources :matches do |match|