v3: allow filtering builds by event_type, state and previous_state

lib/travis/api/v3/queries/builds.rb

@@ -1,11 +1,16 @@
 module Travis::API::V3
   class Queries::Builds < Query
+    params :state, :event_type, :previous_state, prefix: :build
+
     def find(repository)
       filter(repository.builds)
     end
 
     def filter(list)
-      # filtering by branch, type, etc would go here
+      list = list.where(state:          list(state))          if state
+      list = list.where(previous_state: list(previous_state)) if previous_state
+      list = list.where(event_type:     list(state))          if event_type
+
       list = list.includes(:commit).includes(branch: :last_build).includes(:repository)
       list = list.includes(branch: { last_build: :commit }) if includes? 'build.commit'.freeze
       list

lib/travis/api/v3/query.rb

@@ -51,6 +51,10 @@ module Travis::API::V3
       !!value
     end
 
+    def list(value)
+      value.split(?,.freeze)
+    end
+
     def user_condition(value)
       case value
       when String       then { login: value    }

lib/travis/api/v3/services/builds/find.rb

@@ -1,5 +1,6 @@
 module Travis::API::V3
   class Services::Builds::Find < Service
+    params :state, :event_type, :previous_state, prefix: :build
     paginate
 
     def run!