Print default in help when option type is :boolean and dafault is false

Author: nevesenin

lib/thor/parser/option.rb

@@ -104,6 +104,10 @@ def aliases_for_usage
       end
     end
 
+    def show_default?
+      super || [TrueClass, FalseClass].any? { |c| default.is_a?(c) }
+    end
+
     VALID_TYPES.each do |type|
       class_eval <<-RUBY, __FILE__, __LINE__ + 1
         def #{type}?

spec/parser/option_spec.rb

@@ -269,4 +269,21 @@ def option(name, options = {})
       end
     end
   end
+
+  describe "#print_default" do
+    it "prints boolean with true default value" do
+      expect(option(:foo,    {
+        required: false,
+        type: :boolean,
+        default: true
+      }).print_default).to eq(true)
+    end
+    it "prints boolean with false default value" do
+      expect(option(:foo,    {
+        required: false,
+        type: :boolean,
+        default: false
+      }).print_default).to eq(false)
+    end
+  end
 end