strip markdown syntax for title

browser/lib/markdown.js

@@ -129,8 +129,40 @@ md.renderer.render = function render (tokens, options, env) {
 }
 window.md = md
 
-export default function markdown (content) {
-  if (!_.isString(content)) content = ''
-
-  return md.render(content)
+function strip (input) {
+  var output = input
+  try {
+    output = output
+      .replace(/^([\s\t]*)([\*\-\+]|\d\.)\s+/gm, '$1')
+      .replace(/\n={2,}/g, '\n')
+      .replace(/~~/g, '')
+      .replace(/`{3}.*\n/g, '')
+      .replace(/<(.*?)>/g, '$1')
+      .replace(/^[=\-]{2,}\s*$/g, '')
+      .replace(/\[\^.+?\](\: .*?$)?/g, '')
+      .replace(/\s{0,2}\[.*?\]: .*?$/g, '')
+      .replace(/\!\[.*?\][\[\(].*?[\]\)]/g, '')
+      .replace(/\[(.*?)\][\[\(].*?[\]\)]/g, '$1')
+      .replace(/>/g, '')
+      .replace(/^\s{1,2}\[(.*?)\]: (\S+)( ".*?")?\s*$/g, '')
+      .replace(/^\#{1,6}\s*([^#]*)\s*(\#{1,6})?/gm, '$1')
+      .replace(/([\*_]{1,3})(\S.*?\S)\1/g, '$2')
+      .replace(/(`{3,})(.*?)\1/gm, '$2')
+      .replace(/^-{3,}\s*$/g, '')
+      .replace(/`(.+?)`/g, '$1')
+      .replace(/\n{2,}/g, '\n\n')
+  } catch (e) {
+    console.error(e)
+    return input
+  }
+  return output
 }
+
+const markdown = {
+  render: function markdown (content) {
+    if (!_.isString(content)) content = ''
+    return md.render(content)
+  },
+  strip
+}
+export default markdown