[Docs] Make index pages that show all the available mixins and variables.

doc-src/content/index/mixins.haml

@@ -0,0 +1,14 @@
+---
+title: Compass Documentation | All Mixins
+crumb: Docs
+body_id: home
+---
+%article
+  %h1#logo Compass Mixins
+  
+  - all_mixins.sort_by{|i| i.first.identifier}.each do |item, mixins|
+    %h3= link_to item[:title], item
+    %ul
+      - mixins.sort_by{|m| m.name}.each do |m|
+        %li= mixin_signature(m)
+

doc-src/content/index/variables.haml

@@ -0,0 +1,15 @@
+---
+title: Compass Documentation | All Variables
+crumb: Docs
+body_id: home
+---
+%article
+  %h1#logo Compass Variables
+  
+  - all_constants.sort_by{|i| i.first.identifier}.each do |item, constants|
+    %h3= link_to item[:title], item
+    %ul
+      - constants.sort_by{|c| c.name}.each do |c|
+        %li $#{c.name}
+
+  

doc-src/lib/stylesheets.rb

@@ -139,6 +139,32 @@ def constants(item)
   constants
 end
 
+def all_constants
+  variables = []
+  @items.each do |item|
+    next unless item.identifier =~ %r{/reference}
+    next unless item[:stylesheet]
+    vars = constants(item)
+    if vars.any?
+      variables << [item, vars]
+    end
+  end
+  variables
+end
+
+def all_mixins
+  all_mixins = []
+  @items.each do |item|
+    next unless item.identifier =~ %r{/reference}
+    next unless item[:stylesheet]
+    ms = mixins(item)
+    if ms.any?
+      all_mixins << [item, ms]
+    end
+  end
+  all_mixins
+end
+
 def mixin_signature(mixin, format = :html)
   mixin.sass_signature(:none, format)
 end