From 85c68b13a1d6af3090e02a340a82e42d74d1ebbe Mon Sep 17 00:00:00 2001
From: Luis Neves <lneves@singlestore.com>
Date: Thu, 6 Oct 2022 15:14:48 +0100
Subject: [PATCH] adds new file custom-preload that is loaded in a different
 order before the main.js script is executed

---
 nbclassic/static/custom/custom-preload.js | 13 +++++++++++++
 nbclassic/static/edit/js/main.js          |  1 +
 nbclassic/static/notebook/js/main.js      |  3 ++-
 nbclassic/static/terminal/js/main.js      |  1 +
 nbclassic/static/tree/js/main.js          |  1 +
 nbclassic/templates/page.html             | 13 +++++++++++++
 tools/build-main.js                       |  5 ++++-
 7 files changed, 35 insertions(+), 2 deletions(-)
 create mode 100644 nbclassic/static/custom/custom-preload.js

diff --git a/nbclassic/static/custom/custom-preload.js b/nbclassic/static/custom/custom-preload.js
new file mode 100644
index 000000000..f1f3f8e7d
--- /dev/null
+++ b/nbclassic/static/custom/custom-preload.js
@@ -0,0 +1,13 @@
+// leave at least 2 line with only a star on it below, or doc generation fails
+/**
+ *
+ *
+ * Same goal as custom.js, but loaded in a different order, before the main.js script is executed
+ *
+ *
+ * @module IPython
+ * @namespace IPython
+ * @class custompreloadjs
+ * @static
+ */
+
diff --git a/nbclassic/static/edit/js/main.js b/nbclassic/static/edit/js/main.js
index 1a7265768..2dbbf1adc 100644
--- a/nbclassic/static/edit/js/main.js
+++ b/nbclassic/static/edit/js/main.js
@@ -15,6 +15,7 @@ requirejs([
     'edit/js/notificationarea',
     'bidi/bidi',
     'auth/js/loginwidget', 
+    'custom-preload'
 ], function(
     $,
     contents_service,
diff --git a/nbclassic/static/notebook/js/main.js b/nbclassic/static/notebook/js/main.js
index 5524598a3..51e3e7ce0 100644
--- a/nbclassic/static/notebook/js/main.js
+++ b/nbclassic/static/notebook/js/main.js
@@ -53,7 +53,8 @@ requirejs([
     'notebook/js/searchandreplace',
     'notebook/js/clipboard',
     'bidi/bidi',
-    'notebook/js/celltoolbarpresets/tags'
+    'notebook/js/celltoolbarpresets/tags',
+    'custom-preload'
 ], function(
     $,
     contents_service,
diff --git a/nbclassic/static/terminal/js/main.js b/nbclassic/static/terminal/js/main.js
index 03ea2ab2e..2308895d3 100644
--- a/nbclassic/static/terminal/js/main.js
+++ b/nbclassic/static/terminal/js/main.js
@@ -8,6 +8,7 @@ requirejs([
     'auth/js/loginwidget',
     'services/config',
     'terminal/js/terminado',
+    'custom-preload'
 ], function(
     $,
     utils,
diff --git a/nbclassic/static/tree/js/main.js b/nbclassic/static/tree/js/main.js
index 1bfb38914..8f1991e9c 100644
--- a/nbclassic/static/tree/js/main.js
+++ b/nbclassic/static/tree/js/main.js
@@ -38,6 +38,7 @@ requirejs([
     'tree/js/shutdownbutton',
     'auth/js/loginwidget',
     'bidi/bidi',
+    'custom-preload'
 ], function(
     $,
     contents_service,
diff --git a/nbclassic/templates/page.html b/nbclassic/templates/page.html
index a8d71807d..510e7068b 100644
--- a/nbclassic/templates/page.html
+++ b/nbclassic/templates/page.html
@@ -30,6 +30,7 @@
           paths: {
             'auth/js/main': 'auth/js/main.min',
             custom : '{{ base_url }}custom',
+            'custom-preload' : '{{ base_url }}custom-preload',
             nbextensions : '{{ base_url }}nbextensions',
             kernelspecs : '{{ base_url }}kernelspecs',
             underscore : 'components/underscore/underscore-min',
@@ -99,6 +100,18 @@
           }
       })
 
+      // error-catching custom-preload.js shim.
+      define("custom-preload", function (require, exports, module) {
+          try {
+              var custom = require('custom/custom-preload');
+              console.debug('loaded custom-preload.js');
+              return custom;
+          } catch (e) {
+              console.error("error loading custom-preload.js", e);
+              return {};
+          }
+      })
+      
     document.nbjs_translations = {{ nbjs_translations|safe }};
     document.documentElement.lang = navigator.language.toLowerCase();
     </script>
diff --git a/tools/build-main.js b/tools/build-main.js
index 6a5b29f23..bcd0db1d6 100644
--- a/tools/build-main.js
+++ b/tools/build-main.js
@@ -28,7 +28,9 @@ var rjs_config = {
     "xtermjs-fit": 'components/xterm.js-fit/index',
     "jquery-typeahead": 'components/jquery-typeahead/dist/jquery.typeahead.min',
     contents: 'empty:',
-    custom: 'empty:',
+    custom: 'empty:',   
+    'custom-preload': 'empty:',
+
   },
   map: { // for backward compatibility
     "*": {
@@ -60,6 +62,7 @@ var rjs_config = {
 
   exclude: [
     "custom/custom",
+    "custom/custom-preload",
   ]
 };