lib/clamp/attribute/instance.rb in clamp-1.2.1 vs lib/clamp/attribute/instance.rb in clamp-1.3.0

@@ -1,9 +1,11 @@
+# frozen_string_literal: true
+
 module Clamp
   module Attribute
 
-    # Represents an option/parameter of a Clamp::Command instance.
+    # Represents an attribute of a Clamp::Command instance.
     #
     class Instance
 
       def initialize(attribute, command)
         @attribute = attribute
@@ -25,11 +27,11 @@
       def set(value)
         command.instance_variable_set(attribute.ivar_name, value)
       end
 
       def default
-        command.send(attribute.default_method)
+        command.send(attribute.default_method) if command.respond_to?(attribute.default_method, true)
       end
 
       # default implementation of read_method
       def _read
         set(default) unless self.defined?
@@ -71,10 +73,10 @@
         # Set the parameter value if it's environment variable is present
         value = ENV[attribute.environment_variable]
         begin
           take(value)
         rescue ArgumentError => e
-          signal_usage_error Clamp.message(:env_argument_error, :env => attribute.environment_variable, :message => e.message)
+          signal_usage_error Clamp.message(:env_argument_error, env: attribute.environment_variable, message: e.message)
         end
       end
 
       def unset?
         if attribute.multivalued?