lib/miam/template_helper.rb in miam-0.2.4 vs lib/miam/template_helper.rb in miam-0.2.5.beta1

@@ -1,8 +1,10 @@
 module Miam
   module TemplateHelper
     def include_template(template_name, context = {})
+      @template_name = template_name
+      @caller = caller[0]
       tmplt = @context.templates[template_name.to_s]
 
       unless tmplt
         raise "Template `#{template_name}` is not defined"
       end
@@ -13,8 +15,17 @@
       @context = context_orig
     end
 
     def context
       @context
+    end
+
+    def required(*args)
+      missing_args = args.map(&:to_s) - @context.keys.map(&:to_s)
+      unless missing_args.empty?
+        ex = ArgumentError.new("Missing arguments: [#{missing_args.join(", ")}] in template: '#{@template_name}'")
+        ex.set_backtrace(@caller)
+        raise ex
+      end
     end
   end
 end