Expose used/unused options in parser

1 files changed, 9 insertions, 2 deletions

diff --git a/lib/slop/parser.rb b/lib/slop/parser.rb
index 3bcb0a9..b6dc83f 100644
--- a/lib/slop/parser.rb
+++ b/lib/slop/parser.rb
@@ -1,9 +1,10 @@
 module Slop
   class Parser
-    attr_reader :options
+    attr_reader :options, :used_options
 
     def initialize(options)
-      @options = options
+      @options      = options
+      @used_options = []
     end
 
     def parse(strings)
@@ -14,6 +15,8 @@ module Slop
         option = matching_option(flag)
 
         if option
+          used_options << option
+
           option.call(arg)
         end
       end
@@ -21,6 +24,10 @@ module Slop
       Result.new(self)
     end
 
+    def unused_options
+      options.to_a - used_options
+    end
+
     private
 
     def matching_option(flag)