Added ability to override Disqus integration using metadata

docs/getting-started.md

@@ -580,7 +580,7 @@ in your `mkdocs.yml`:
 
 ``` yaml
 extra:
-  disqus: 'mkdocs-material'
+  disqus: 'your-shortname'
 ```
 
 The comments section is inserted on *every page, except the index page*.

material/base.html

@@ -154,8 +154,8 @@
                 {% endblock %}
               {% endblock %}
               {% block disqus %}
-                {% if config.extra.disqus and not page.is_homepage %}
-                  <h2 id="__comments">{{ lang.t("meta.comments") }}</h2>
+                {% if (config.extra.disqus and not page.is_homepage) or
+                      (page and page.meta and page.meta.disqus) %}
                   {% include "partials/integrations/disqus.html" %}
                 {% endif %}
               {% endblock %}

material/partials/integrations/disqus.html

+{% set disqus = config.extra.disqus %}
+{% if page and page.meta and page.meta.disqus is string %}
+  {% set disqus = page.meta.disqus %}
+{% endif %}
+{% if disqus %}
+  <h2 id="__comments">{{ lang.t("meta.comments") }}</h2>
   <div id="disqus_thread"></div>
   <script>
     var disqus_config = function () {
@@ -7,8 +13,9 @@
     };
     (function() {
       var d = document, s = d.createElement("script");
-    s.src = "//{{ config.extra.disqus }}.disqus.com/embed.js";
+      s.src = "//{{ disqus }}.disqus.com/embed.js";
       s.setAttribute("data-timestamp", +new Date());
       (d.head || d.body).appendChild(s);
     })();
   </script>
+{% endif %}

material/partials/toc.html

@@ -17,7 +17,11 @@
           </a>
         </li>
       {% endif %}
-      {% if config.extra.disqus and not page.is_homepage %}
+      {% set disqus = config.extra.disqus %}
+      {% if page and page.meta and page.meta.disqus is string %}
+        {% set disqus = page.meta.disqus %}
+      {% endif %}
+      {% if disqus %}
         <li class="md-nav__item">
           <a href="#__comments" title="{{ lang.t('meta.comments') }}" class="md-nav__link md-nav__link--active">
             {{ lang.t("meta.comments") }}

src/base.html

@@ -288,8 +288,8 @@
 
               <!-- Disqus integration -->
               {% block disqus %}
-                {% if config.extra.disqus and not page.is_homepage %}
-                  <h2 id="__comments">{{ lang.t("meta.comments") }}</h2>
+                {% if (config.extra.disqus and not page.is_homepage) or
+                      (page and page.meta and page.meta.disqus) %}
                   {% include "partials/integrations/disqus.html" %}
                 {% endif %}
               {% endblock %}

src/partials/integrations/disqus.html

@@ -20,7 +20,15 @@
   IN THE SOFTWARE.
 -->
 
+<!-- Set from config but allow override -->
+{% set disqus = config.extra.disqus %}
+{% if page and page.meta and page.meta.disqus is string %}
+  {% set disqus = page.meta.disqus %}
+{% endif %}
+
 <!-- Disqus integration -->
+{% if disqus %}
+  <h2 id="__comments">{{ lang.t("meta.comments") }}</h2>
   <div id="disqus_thread"></div>
   <script>
     var disqus_config = function () {
@@ -30,8 +38,9 @@
     };
     (function() {
       var d = document, s = d.createElement("script");
-    s.src = "//{{ config.extra.disqus }}.disqus.com/embed.js";
+      s.src = "//{{ disqus }}.disqus.com/embed.js";
       s.setAttribute("data-timestamp", +new Date());
       (d.head || d.body).appendChild(s);
     })();
   </script>
+{% endif %}

src/partials/toc.html

@@ -55,7 +55,11 @@
       {% endif %}
 
       <!-- Disqus integration -->
-      {% if config.extra.disqus and not page.is_homepage %}
+      {% set disqus = config.extra.disqus %}
+      {% if page and page.meta and page.meta.disqus is string %}
+        {% set disqus = page.meta.disqus %}
+      {% endif %}
+      {% if disqus %}
         <li class="md-nav__item">
           <a href="#__comments" title="{{ lang.t('meta.comments') }}"
               class="md-nav__link md-nav__link--active">