From bc04e18abaece7ccd8cacd1851353c87339c01cc Mon Sep 17 00:00:00 2001
From: Christopher Olah <colah@google.com>
Date: Fri, 13 Jan 2017 13:11:07 -0800
Subject: [PATCH] update url links for arxiv papers

---
 components/citation.js | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/components/citation.js b/components/citation.js
index 0873ce0..954052a 100644
--- a/components/citation.js
+++ b/components/citation.js
@@ -114,12 +114,20 @@ export default function(dom, data) {
 
   function link_string(ent){
     if ("url" in ent){
-      if (ent.url.slice(-4) == ".pdf"){
+      var url = ent.url;
+      var arxiv_match = (/arxiv\.org\/abs\/([0-9\.]*)/).exec(url);
+      if (arxiv_match != null){
+        console.log(url);
+        url = `http://arxiv.org/pdf/${arxiv_match[1]}.pdf`;
+          console.log(url);
+      }
+
+      if (url.slice(-4) == ".pdf"){
         var label = "PDF";
-      } else if (ent.url.slice(-5) == ".html") {
+      } else if (url.slice(-5) == ".html") {
         var label = "HTML";
       }
-      return ` &ensp;<a href="${ent.url}">[${label||"link"}]</a>`;
+      return ` &ensp;<a href="${url}">[${label||"link"}]</a>`;
     }/* else if ("doi" in ent){
       return ` &ensp;<a href="https://doi.org/${ent.doi}" >[DOI]</a>`;
     }*/ else {