From c195d2d1a6d5e94503d81afa6a3952c6eeb53b32 Mon Sep 17 00:00:00 2001
From: "qingwei.li" <cinwell.li@gmail.com>
Date: Mon, 2 Oct 2017 13:26:36 +0800
Subject: [PATCH] fix(slugify): GitHub compatible heading links, fixed #267

---
 src/core/render/slugify.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/core/render/slugify.js b/src/core/render/slugify.js
index e37318f43..4b71337d5 100644
--- a/src/core/render/slugify.js
+++ b/src/core/render/slugify.js
@@ -4,8 +4,9 @@ const re = /[\u2000-\u206F\u2E00-\u2E7F\\'!"#$%&()*+,.\/:;<=>?@\[\]^`{|}~]/g
 export function slugify (str) {
   if (typeof str !== 'string') return ''
 
+  str = /^[\w\s]+$/g.test(str) ? str.toLowerCase() : str
+
   let slug = str
-    .toLowerCase()
     .trim()
     .replace(/<[^>\d]+>/g, '')
     .replace(re, '')