Fix: sort delays by the most specific rule\

* based on the length of the rule path

lib/robotex.rb

@@ -27,7 +27,7 @@ def initialize(uri, user_agent)
 
       @disallows = {}
       @allows = {}
-      @delays = {}
+      @delays = []
       @sitemaps = []
       agent = /.*/
       io.each do |line|
@@ -46,15 +46,17 @@ def initialize(uri, user_agent)
             @disallows[agent] ||= []
             @disallows[agent] << to_regex(value)
           when "crawl-delay"
-            @delays[agent] = value.to_i
+            @delays << [agent, value.to_i]
           when "sitemap"
             @sitemaps << URI.join(uri, value).to_s
         end
       end
+
+      @delays.sort_by! { |(agent, rule)| agent.to_s.size }.reverse!
 
       @parsed = true
     end
-    
+
     def allowed?(uri, user_agent)
       return true unless @parsed
       allowed = true

spec/robotex_spec.rb

@@ -106,6 +106,23 @@
         robotex.delay(SPEC_DOMAIN).should == 20
       end
     end
+
+    context 'when a more specific rule is declared' do
+      let(:robots) do
+        <<~ROBOTS
+          User-agent: *
+          Crawl-delay: 10
+
+          User-agent: usasearch
+          Crawl-delay: 2
+        ROBOTS
+      end
+
+      it 'overrides more generic ones' do
+        robotex = Robotex.new('usasearch')
+        robotex.delay(SPEC_DOMAIN).should == 2
+      end
+    end
   end
 
   describe '#sitemaps' do