Add method Referator::Command#data_kwargs!

lib/referator/command.rb

@@ -18,6 +18,12 @@ module Referator
       @data = freeze_data JSON.parse json
     end
 
+    def data_kwargs!
+      raise 'Expected command data to be a hash' unless data.instance_of? Hash
+
+      @data_kwargs ||= data.transform_keys(&:to_sym).freeze
+    end
+
   private
 
     def freeze_data(object)

lib/referator/machine.rb

@@ -45,7 +45,7 @@ module Referator
     ##########
 
     def do_register_script(command)
-      @config.scripts.register(**command.data.transform_keys(&:to_sym))
+      @config.scripts.register(**command.data_kwargs!)
       nil
     end
 
@@ -55,12 +55,12 @@ module Referator
     end
 
     def do_register_format(command)
-      @config.formats.register(**command.data.transform_keys(&:to_sym))
+      @config.formats.register(**command.data_kwargs!)
       nil
     end
 
     def do_register_ref(command)
-      @config.repo.register_ref(**command.data.transform_keys(&:to_sym))
+      @config.repo.register_ref(**command.data_kwargs!)
       nil
     end
 
@@ -70,7 +70,7 @@ module Referator
 
     def do_ref(command)
       @config.freeze
-      @config.repo[command.data['category'], command.data['id']].to_h
+      @config.repo[*category_and_id(**command.data_kwargs!)].to_h
     end
 
     ############
@@ -79,7 +79,7 @@ module Referator
 
     def do_make_ref(command)
       @config.freeze
-      @footnotes.make_ref(command.data['category'], command.data['id']).to_h
+      @footnotes.make_ref(*category_and_id(**command.data_kwargs!)).to_h
     end
 
     #############
@@ -93,7 +93,7 @@ module Referator
 
     def do_fetch_note(command)
       @config.freeze
-      @footnotes.fetch_note(command.data['category'], command.data['id']).to_h
+      @footnotes.fetch_note(*category_and_id(**command.data_kwargs!)).to_h
     end
 
     def do_render_footnotes(command)
@@ -103,7 +103,13 @@ module Referator
 
     def do_render_cite_sup(command)
       @config.freeze
-      String @footnotes.render_cite_sup(**command.data.transform_keys(&:to_sym))
+      String @footnotes.render_cite_sup(**command.data_kwargs!)
     end
+
+    #########
+    # Utils #
+    #########
+
+    def category_and_id(category:, id:) = [category, id]
   end
 end