use_cases.rb in eco-helpers-2.0.26

- old
+ new

@@ -27,13 +27,16 @@
           @core_config  = core_config
           @linked_cases = {}
         end
 
         # @return [String] summary of the use cases.
-        def help
-          ["The following are the available use cases:"].yield_self do |lines|
+        def help(refine: nil)
+          refinement = refine.is_a?(String)? " (containing: '#{refine}')" : ""
+          ["The following are the available use cases#{refinement}:"].yield_self do |lines|
             max_len = keys_max_len(@linked_cases.keys)
-            @linked_cases.keys.sort.each do |option_case|
+            @linked_cases.keys.sort.select do |key|
+              refine.is_a?(String) && key.include?(refine)
+            end.each do |option_case|
               lines << help_line(option_case, @linked_cases[option_case].description, max_len)
             end
             lines
           end.join("\n")
         end