add the ability to set slide theme in slide options

Author: butlerx

lib/response.js

@@ -574,6 +574,7 @@ function showPublishSlide (req, res, next) {
         updatetime: updatetime,
         url: origin,
         body: markdown,
+        theme: meta.slideOptions.theme,
         meta: JSON.stringify(extracted.meta),
         useCDN: config.usecdn,
         owner: note.owner ? note.owner.id : null,

public/views/slide.ejs

@@ -30,7 +30,11 @@
         <% } %>
 
         <!-- For reveal.js theme -->
+        <% if(typeof theme !== 'undefined' && theme) { %>
+        <link rel="stylesheet" href="<%- url %>/build/reveal.js/css/theme/<%= theme %>.css" id="theme">
+        <% } else { %>
         <link rel="stylesheet" href="<%- url %>/build/reveal.js/css/theme/black.css" id="theme">
+        <% } %>
         <!-- For syntax highlighting -->
         <link rel="stylesheet" href="<%- url %>/build/reveal.js/lib/css/zenburn.css">
         <!-- For overwrite reveal.js -->