Add feeling lucky query with ! directive

app/controllers/gists_controller.rb

@@ -4,16 +4,34 @@ class GistsController < ApplicationController
 
   before_filter :force_user_login
 
+  JUMP_CHAR = '!'
+
   def index
     @gists = current_user.gists.order("gh_created_at DESC").includes(:files)
   end
 
   def search
-    @results = Gist.search(current_user, params[:q])
+    @results = Gist.search(current_user, normalized_query)
+    if(feeling_lucky_directive? && lucky_result = @results.first)
+      redirect_to lucky_result.url
+      log({ns: self.class, fn: __method__, measure: true, at: 'auto-jump', query: params[:q]}, {:'redirect-to' => lucky_result.url}, current_user)
+    end
   end
 
   def refresh
     QC.enqueue("GistFetcher.fetch_user", current_user.id)
     redirect_to search_gists_path
   end
+
+  private
+
+  # Strip navigational search directives ("!") without modifying original query param
+  def normalized_query
+    @normalized_query ||= feeling_lucky_directive? ? params[:q][0..-2] : params[:q]
+  end
+
+  def feeling_lucky_directive?
+    params[:q] && JUMP_CHAR == params[:q].last
+  end
+
 end