Added def_getter

src/cligen/command/argument.cr

@@ -1,6 +1,6 @@
 module CliGen
   class Command
-    macro argument(variable, description, long = nil, short = nil, validation = nil, on_match = nil, def_setter = false, options = nil)
+    macro argument(variable, description, long = nil, short = nil, validation = nil, on_match = nil, def_setter = false, def_getter = false, options = nil)
       {% raise "ERROR : CliGen::Command.argument : def_setter must be a Bool" unless def_setter.is_a? BoolLiteral %}
       {% raise "ERROR : CliGen::Command.argument : First argument (#{variable}) must be a TypeDeclaration (ex: '<var> : <type> [= val]')" unless variable.is_a? TypeDeclaration %}
       {% name = variable.var %}
@@ -40,6 +40,12 @@ module CliGen
       @[CliGen::Argument(short: {{short}}, long: {{long}}, description: {{description}}, validation: {{validation}}, on_match: {{on_match}}, options: {{options}})]
       @{{variable}}
 
+      {% if def_getter %}
+      def {{variable.var}}
+        @{{name}}
+      end
+      {% end %}
+
       {% if def_setter %}
       def {{variable.var}}= (value : {{type}})
         {% unless validation.nil? %}