Ruby binding: linklist collect method

added a collect method for freej's linked lists in the ruby binding.
Created an example script which uses this to print out a list of the
installed filters, sorted by name.

bindings/ruby/freej_extensions.rb

@@ -51,5 +51,18 @@ module Freej
       end
       self
     end
+    #apply the block to every element in the linked list and return an array
+    #with the resultant return values from the block
+    def collect(&block)
+      res = Array.new
+      index = 1
+      item = self.pick(index)
+      while item != nil
+        res << block.call(item)
+        index = index + 1
+        item = self.pick(index)
+      end
+      res
+    end
   end
 end

scripts/ruby/list_filters.rb

@@ -0,0 +1,18 @@
+#!/usr/bin/ruby
+#for now update the load path to include the location of 
+#the freej module and freej_extensions [as we haven't installed it yet]
+$: << '../../bindings/ruby/.libs'
+$: << '../../bindings/ruby/'
+##import the Freej module
+require 'Freej'
+#initializes Freej creating a Contex
+cx = Freej::Context.new
+#refresh the filter list
+cx.plugger.refresh(cx)
+#we collect because this creates a ruby array out of the filter linked list
+#then we sort by name [case insensitive], then we print the name and description
+#of each of the sorted filters
+cx.filters.collect{|f| f}.sort {|x,y| x.name.downcase <=> y.name.downcase }.each do |f|
+  puts f.name
+  puts "\t#{f.description}"
+end