Fix sphinx_rtd_theme theme override in embed js

readthedocs/core/static-src/core/js/doc-embed/footer.js

@@ -1,4 +1,3 @@
-var Build = require('./build').Build;
 var rtddata = require('./rtd-data');
 var versionCompare = require('./version-compare');
 
@@ -10,7 +9,7 @@ function init() {
         project: rtd['project'],
         version: rtd['version'],
         page: rtd['page'],
-        theme: rtd['theme'],
+        theme: rtd.get_theme_name(),
         format: "jsonp",
     };
 
@@ -50,11 +49,11 @@ function init() {
 
 
 function injectFooter(data) {
-    var build = new Build(rtddata.get());
+    var config = rtddata.get();
 
     // If the theme looks like ours, update the existing badge
     // otherwise throw a a full one into the page.
-    if (build.is_rtd_theme()) {
+    if (config.is_rtd_theme()) {
         $("div.rst-other-versions").html(data['html']);
     } else {
         $("body").append(data['html']);
@@ -67,7 +66,7 @@ function injectFooter(data) {
     }
 
     // Show promo selectively
-    if (data.promo && build.show_promo()) {
+    if (data.promo && config.show_promo()) {
         var promo = new sponsorship.Promo(
             data.promo_data.id,
             data.promo_data.text,

readthedocs/core/static-src/core/js/doc-embed/rtd-data.js

@@ -5,14 +5,50 @@
  */
 
 
+var configMethods = {
+    is_rtd_theme: function () {
+        return this.get_theme_name() === 'sphinx_rtd_theme';
+    },
+
+    is_sphinx_builder: function () {
+        return (!('builder' in this) || this.builder != 'mkdocs');
+    },
+
+    get_theme_name: function () {
+        // Crappy heuristic, but people change the theme name on us.  So we have to
+        // do some duck typing.
+        if (this.theme !== 'sphinx_rtd_theme') {
+            if ($('div.rst-other-versions').length === 1) {
+                return 'sphinx_rtd_theme';
+            }
+        }
+        return this.theme;
+    },
+
+    show_promo: function () {
+        return (
+            this.api_host !== 'https://readthedocs.com' &&
+            this.is_sphinx_builder() &&
+            this.is_rtd_theme());
+    }
+};
+
+
 /*
  * Access READTHEDOCS_DATA on call, not on module load. The reason is that the
  * READTHEDOCS_DATA might not be available during script load time.
  */
 function get() {
-    return $.extend({
+    // Make `methods` the prototype.
+    var config = Object.create(configMethods);
+
+    var defaults = {
         api_host: 'https://readthedocs.org'
-    }, window.READTHEDOCS_DATA);
+    };
+
+    $.extend(config, defaults, window.READTHEDOCS_DATA);
+
+    return config;
 }