added info on lists and extending sass with ruby

Gemfile

@@ -2,4 +2,5 @@ source :rubygems
 
 gem 'sinatra', '~> 1.3.2'
 gem 'attentive', :path => '../attentive'
+gem 'thin'
 

Gemfile.lock

@@ -61,7 +61,9 @@ GEM
       chunky_png (~> 1.2)
       fssm (>= 0.2.7)
       sass (~> 3.1)
+    daemons (1.1.8)
     erubis (2.7.0)
+    eventmachine (0.12.10)
     execjs (1.3.0)
       multi_json (~> 1.0)
     ffi (1.0.11)
@@ -126,6 +128,10 @@ GEM
       sprockets (~> 2.0)
       tilt (~> 1.1)
     sprockets-vendor_gems (0.1.1)
+    thin (1.3.1)
+      daemons (>= 1.0.9)
+      eventmachine (>= 0.12.6)
+      rack (>= 1.0.0)
     thor (0.14.6)
     tilt (1.3.3)
     treetop (1.4.10)
@@ -139,3 +145,4 @@ PLATFORMS
 DEPENDENCIES
   attentive!
   sinatra (~> 1.3.2)
+  thin

presentation/02_sass.slides

@@ -25,6 +25,43 @@
 
 ```
 
+!SLIDE 
+
+# Lists
+
+``` css
+  border : 1px solid black;
+```
+
+!SLIDE
+
+``` scss 
+  $my-list : 1px solid black;
+  $my-list2 : 1px, solid, black;
+  $my-list3 : (1px solid black);
+
+  border : $my-list;
+
+```
+
+!SLIDE
+
+# In ruby
+
+``` ruby 
+  Sass::Script::List.new(['1px', 'solid', 'black'], ',')
+```
+
+!SLIDE
+## List Functions
+
+* `length($list)`
+* `nth($list, $n)`
+* `join($list1, $list2, [$separator])`
+* More coming soon!
+
+
+
 !SLIDE mixins
 
 # Functions and Mixins
@@ -84,3 +121,31 @@ a:hover { color : red; }
 }
 
 ```
+
+!SLIDE
+## Extending with ruby
+
+``` ruby
+def sprite(map, sprite, offset_x = ZERO, offset_y = ZERO)
+  sprite = convert_sprite_name(sprite)    
+  verify_map(map)
+  unless sprite.is_a?(Sass::Script::String)
+    raise Sass::SyntaxError
+  end
+  url = sprite_url(map)
+  position = sprite_position(map, sprite, offset_x, offset_y)
+  Sass::Script::List.new([url] + position.value, :space)
+end
+Sass::Script::Functions.declare :sprite, [:map, :sprite]
+Sass::Script::Functions.declare :sprite, [:map, :sprite, :offset_x]
+Sass::Script::Functions.declare :sprite, [:map, :sprite, :offset_x, :offset_y]
+```
+
+!SLIDE
+## Data types
+
+ * Bool
+ * Color
+ * List
+ * Number
+ * String