From ecab2eb473bc5504b417557c88deb2fe91c6cffe Mon Sep 17 00:00:00 2001
From: akira yamada <akira@arika.org>
Date: Tue, 17 Dec 2013 10:57:12 +0900
Subject: [PATCH] made error description more helpful

---
 lib/jekyll/tags/post_url.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/jekyll/tags/post_url.rb b/lib/jekyll/tags/post_url.rb
index 52c5c2ed..af366702 100644
--- a/lib/jekyll/tags/post_url.rb
+++ b/lib/jekyll/tags/post_url.rb
@@ -7,7 +7,7 @@ module Jekyll
 
       def initialize(name)
         all, path, date, slug = *name.sub(/^\//, "").match(MATCHER)
-        raise ArgumentError.new("invalid post name") unless all
+        raise ArgumentError.new("'#{name}' does not contain valid date and/or title") unless all
         @slug = path ? path + slug : slug
         @date = Time.parse(date)
       end