From 8838b53e2e9732b4a016c43cd8aafc672e12f3a8 Mon Sep 17 00:00:00 2001
From: David Ashby <delta.mu.alpha@gmail.com>
Date: Tue, 23 May 2017 21:39:49 -0400
Subject: [PATCH] generate isbn-10s if I don't have them, and load images from
 amazon

---
 css/style.css |  1 +
 index.html    | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

diff --git a/css/style.css b/css/style.css
index 7c4deeb..7a36f6a 100644
--- a/css/style.css
+++ b/css/style.css
@@ -126,6 +126,7 @@
 
 #current img {
   max-height: 400px;
+  max-width: 100%;
   display: block;
   margin: 0 auto;
 }
diff --git a/index.html b/index.html
index 23797be..14c4196 100644
--- a/index.html
+++ b/index.html
@@ -34,6 +34,12 @@
 
       $.each(data, function(key, value) {
         value.sortTitle = titleCleaner(value.title);
+        if (!value['isbn-10'] && value['isbn-13']) {
+          value['isbn-10'] = generateISBNfromEAN(value['isbn-13']);
+        }
+        if (!value.coverurl && value['isbn-10']) {
+          value.coverurl = generateAmazonCoverUrl(value['isbn-10']);
+        }
       });
 
       renderTable(data);
@@ -95,6 +101,18 @@
         .replace(/^(An?|The)\s/i, '');
     }
 
+    function generateAmazonCoverUrl(ISBN) {
+      return "https://images-na.ssl-images-amazon.com/images/P/" + ISBN + ".01.LZZ.jpg"
+    }
+
+    function generateISBNfromEAN(EAN) {
+      ISBN = EAN.slice(3,12);
+      var checkdigit = ((11 - (_.reduce(ISBN.split(''), function(sum, num, key) {
+        return sum + (num * (10 - key));
+      }, 0) % 11)) % 11);
+      return ISBN + (checkdigit == 10 ? 'X' : checkdigit);
+    }
+
     window.addEventListener('DOMContentLoaded', init);
   </script>
 </head>