[gi-docgen/ebassi/devhelp: 2/2] template: Detect DevHelp's user agent

[Emmanuele Bassi <ebassi src gnome org>]

commit a2512f8771daa28e0d8a8fea7bd91603ea57b523
Author: Emmanuele Bassi <ebassi gnome org>
Date:   Wed Apr 7 13:25:47 2021 +0100

    template: Detect DevHelp's user agent
    
    For instance: do not bother loading the search index when using DevHelp,
    as DevHelp already has its own search functionality. The sidebar is also
    not visible, so it won't be possible to search through it.

 gidocgen/templates/basic/main.js | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)
---
diff --git a/gidocgen/templates/basic/main.js b/gidocgen/templates/basic/main.js
index 46f03fb..4ea9f56 100644
--- a/gidocgen/templates/basic/main.js
+++ b/gidocgen/templates/basic/main.js
@@ -68,6 +68,10 @@ function getSearchInput() {
     return document.getElementsByClassName("search-input")[0];
 }
 
+function getSidebar() {
+    return document.getElementsByClassName("sidebar")[0];
+}
+
 function getQueryStringParams() {
     var params = {};
     window.location.search.substring(1).split('&').
@@ -438,6 +442,7 @@ window.addEventListener("load", function() {
     var main = document.getElementById("main");
     var btnToTop = document.getElementById("btn-to-top");
 
+    var sidebar = getSidebar();
     var searchInput = getSearchInput();
 
     function labelForToggleButton(isCollapsed) {
@@ -553,8 +558,11 @@ window.addEventListener("load", function() {
         });
     }
 
-    if (window.buildIndex) {
-        window.buildIndex('index.json');
+    // Don't bother loading the search index when using DevHelp
+    if (navigator.userAgent.indexOf("DevHelp") === -1) {
+        if (window.buildIndex) {
+            window.buildIndex('index.json');
+        }
     }
 }, false);