Add escape to linkify() so it can handle CJK characters correctly

Signed-off-by: Tao Wang <twang2218@gmail.com>

index.js

@@ -5,6 +5,7 @@
  */
 
 var utils = require('./lib/utils');
+var querystring = require('querystring');
 
 /**
  * expose `toc`
@@ -182,6 +183,7 @@ function linkify(tok, opts) {
     if (tok.seen) {
       slug += '-' + tok.seen;
     }
+    slug = querystring.escape(slug);
     if (opts && typeof opts.linkify === 'function') {
       return opts.linkify(tok, text, slug, opts);
     }

test/expected/insert-options.md

@@ -9,7 +9,7 @@ name: Test
 
 - [Quickstart](#quickstart)
 - [Options](#options)
-- [Usage examples](#usage examples)
+- [Usage examples](#usage%20examples)
 - [Contributing](#contributing)
 - [Author](#author)
 

test/test.js

@@ -82,6 +82,12 @@ describe('options: custom functions:', function() {
     actual.content.should.equal('- [Foo & Bar](#foo--bar)');
   });
 
+  it('should escape the CJK characters in linkify', function() {
+    toc('# 中文').content.should.equal('- [中文](#%E4%B8%AD%E6%96%87)');
+    toc('# かんじ').content.should.equal('- [かんじ](#%E3%81%8B%E3%82%93%E3%81%98)');
+    toc('# 한자').content.should.equal('- [한자](#%ED%95%9C%EC%9E%90)');
+  });
+
   it('should condense spaces in the heading text', function() {
     var actual = toc('# Some    Article');
     actual.content.should.equal('- [Some Article](#some----article)');