Setup adddition of Resource + Resource as merges

Author: alerque

fluent/init.lua

@@ -16,9 +16,9 @@ local FluentBundle = class({
 
     add_messages = function (self, input)
       if type(input) == "string" then input = { input } end
-      -- TODO: add way to add two resources together, then reduce instead of unpacking this
-      local resource = tablex.imap(function (v) return self.syntax:parsestring(v) end, input)
-      self.locales[self.locale] = resource[1]
+      local resources = tablex.imap(function (v) return self.syntax:parsestring(v) end, input)
+      local resource = tablex.reduce('+', resources)
+      self.locales[self.locale] = resource
     end,
 
     format = function (self, identifier, parameters)

fluent/resource.lua

@@ -281,6 +281,13 @@ local FluentResource = class({
       local ast =  { type = "Resource", body = {} }
       for _, v in ipairs(self.body) do table.insert(ast.body, v:dump_ast()) end
       return ast
+    end,
+
+    __add = function (self, resource)
+      for _, node in ipairs(resource.body) do
+        self:insert(node)
+      end
+      return self
     end
 
   })