From 403bc949a5402a6a0a113b54250aa1e28a969d94 Mon Sep 17 00:00:00 2001
From: Petr Sloup <slouppetr@gmail.com>
Date: Thu, 17 Mar 2016 10:51:16 +0100
Subject: [PATCH] Pregenerate permalinks for the viewers

---
 public/templates/index.tmpl |  8 ++++----
 src/server.js               | 15 ++++++++++++---
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/public/templates/index.tmpl b/public/templates/index.tmpl
index 3e81fd3..1c4457f 100644
--- a/public/templates/index.tmpl
+++ b/public/templates/index.tmpl
@@ -20,19 +20,19 @@
       <h3>{{name}}</h3>
       <span>(id: {{@key}})</span>
       {{#if serving_style}}
-        <a href="/styles/{{@key}}/?vector">Viewer (vector)</a>
+        <a href="/styles/{{@key}}/?vector{{viewer_hash}}">Viewer (vector)</a>
       {{/if}}
       {{#if serving_raster}}
-        <a href="/styles/{{@key}}/?raster">Viewer (raster)</a>
+        <a href="/styles/{{@key}}/?raster{{viewer_hash}}">Viewer (raster)</a>
       {{/if}}
       {{#if serving_style}}
         {{#if serving_raster}}
-          <a href="/styles/{{@key}}/">Viewer (auto)</a>
+          <a href="/styles/{{@key}}/{{viewer_hash}}">Viewer (auto)</a>
         {{/if}}
       {{/if}}
       {{#if serving_raster}}
         <a href="/raster/{{@key}}.json">TileJSON</a>
-        {{/if}}
+      {{/if}}
     </li>
   {{/each}}
   </ul>
diff --git a/src/server.js b/src/server.js
index 1d8e4a0..e35416d 100644
--- a/src/server.js
+++ b/src/server.js
@@ -180,9 +180,18 @@ module.exports = function(opts, callback) {
   serveTemplate(/^\/$/, 'index', function() {
     var styles = clone(config.styles || {});
     Object.keys(styles).forEach(function(id) {
-      styles[id].name = (serving.styles[id] || serving.raster[id]).name;
-      styles[id].serving_style = serving.styles[id];
-      styles[id].serving_raster = serving.raster[id];
+      var style = styles[id];
+      style.name = (serving.styles[id] || serving.raster[id] || {}).name;
+      style.serving_style = serving.styles[id];
+      style.serving_raster = serving.raster[id];
+      if (style.serving_raster) {
+        var center = style.serving_raster.center;
+        if (center) {
+          style.viewer_hash = '#' + center[2] + '/' +
+                              center[1].toFixed(5) + '/' +
+                              center[0].toFixed(5);
+        }
+      }
     });
     return {
       styles: styles,