add auto link

src/Common.js

@@ -1,10 +1,21 @@
 import React, {Component} from 'react';
+
 import TimeAgo from 'react-timeago';
+import Linkify, {linkify} from 'react-linkify';
 import chineseStrings from 'react-timeago/lib/language-strings/zh-CN';
 import buildFormatter from 'react-timeago/lib/formatters/buildFormatter';
+
 import './Common.css';
 
 const chinese_format=buildFormatter(chineseStrings);
+const PID_RE_TEXT=/(?:^|[^\d])(\d{5,6})(?!\d)/g;
+
+linkify.add('#', {
+    validate: /^(\d{5,6})/,
+    normalize: (match) => {
+        match.url='#'+match.url;
+    },
+});
 
 function pad2(x) {
     return x<10 ? '0'+x : ''+x;
@@ -28,4 +39,12 @@ export function TitleLine(props) {
             <span>{props.text}</span>
         </p>
     )
+}
+
+export function AutoLink(props) {
+    return (
+        <Linkify properties={{target: '_blank'}}>
+            <pre>{props.text.replace(new RegExp(PID_RE_TEXT,'g'),' #$1 ')}</pre>
+        </Linkify>
+    )
 }