DOCS: Automatically make a table of contents (TOC) (#1778)

docs/js.md

@@ -8,6 +8,42 @@ title: JavaScript DSL
 DNSControl uses javascript as its primary input language to provide power and flexibility to configure your domains. The ultimate purpose of the javascript is to construct a
 [DNSConfig](https://godoc.org/github.com/StackExchange/dnscontrol/models#DNSConfig) object that will be passed to the go backend and operated on.
 
+<table class="table-of-contents">
+  <tr>
+    <td>
+        {% include table-of-contents.md
+            docs-functions-dir="domain"
+            html-anchor="domain-modifiers"
+            title="Domain Modifiers"
+        %}
+        {% assign showProviders = 'AKAMAIEDGEDNS, AZURE_DNS, CLOUDFLAREAPI, ROUTE53' %}
+        {% for provider in site.providers %}
+            {% if showProviders contains provider.jsId %}
+                {% include table-of-contents.md
+                    docs-functions-dir="domain"
+                    html-anchor="domain-modifiers"
+                    title="Domain Modifiers"
+                    provider-name=provider.name
+                    provider-jsId=provider.jsId
+                %}
+            {% endif %}
+        {% endfor %}
+    </td>
+    <td>
+        {% include table-of-contents.md
+            docs-functions-dir="global"
+            html-anchor="top-level-functions"
+            title="Top Level Functions"
+        %}
+        {% include table-of-contents.md
+            docs-functions-dir="record"
+            html-anchor="record-modifiers"
+            title="Record Modifiers"
+        %}
+    </td>
+  </tr>
+</table>
+
 {% include funcList.md title="Top Level Functions" dir="global" %}
 
 {% include funcList.md title="Domain Modifiers" dir="domain" %}