[#604] Port hello_world macro to liquid

lib/chili_project/liquid/tags.rb

@@ -25,8 +25,12 @@ module ChiliProject::Liquid
 
     # TODO: reimplement old macros as tags and register them here
     # child_pages
-    # hello_world
+    register_tag('hello_world', HelloWorld)
     # include
     # macro_list
   end
 end
+
+# FIXME: remove the deprecated syntax for 4.0, provide a way to migrate
+# existing pages to the new syntax.
+ChiliProject::Liquid::Legacy.add('hello_world', :tag)

lib/chili_project/liquid/tags/hello_world.rb

@@ -0,0 +1,11 @@
+module ChiliProject::Liquid::Tags
+  class HelloWorld < Tag
+    def initialize(tag_name, markup, tokens)
+      super
+    end
+
+    def render(context)
+      "Hello world!"
+    end
+  end
+end

lib/redmine/wiki_formatting/macros.rb

@@ -68,11 +68,6 @@ module Redmine
       end
 
       # Builtin macros
-      desc "Sample macro."
-      macro :hello_world do |obj, args|
-        "Hello world! Object: #{obj.class.name}, " + (args.empty? ? "Called with no argument." : "Arguments: #{args.join(', ')}")
-      end
-
       desc "Displays a list of all available macros, including description if available."
       macro :macro_list do
         out = ''