- icorporeted feedback from bollwyvl

nbconvert/exporters/slides.py

@@ -119,6 +119,11 @@ def _template_extension_default(self):
         """
     ).tag(config=True)
 
+    reveal_mermaid_js_url = Unicode(
+        default="https://cdn.jsdelivr.net/npm/reveal.js-mermaid-plugin@2.2.0/plugin/mermaid/mermaid.js",
+        help="specifies the mermaid reveal plugin url. defaults to cdn 2.2.0",
+    ).tag(config=True)
+
     @default("reveal_url_prefix")
     def _reveal_url_prefix_default(self):
         if "RevealHelpPreprocessor.url_prefix" in self.config:
@@ -129,7 +134,6 @@ def _reveal_url_prefix_default(self):
             )
             return self.config.RevealHelpPreprocessor.url_prefix
         return "https://unpkg.com/reveal.js@4.0.2"
-
     reveal_theme = Unicode(
         "simple",
         help="""

share/templates/reveal/index.html.j2

@@ -142,7 +142,7 @@ require(
     [
       "{{ reveal_url_prefix }}/dist/reveal.js",
       "{{ reveal_url_prefix }}/plugin/notes/notes.js",
-      "https://cdn.jsdelivr.net/npm/reveal.js-mermaid-plugin@2.2.0/plugin/mermaid/mermaid.js"
+      {% if reveal_mermaid_js_url %}"{{ reveal_mermaid_js_url }}",{% endif %},
     ],
 
     function(Reveal, RevealNotes, RevealMermaid){
@@ -153,7 +153,10 @@ require(
             history: true,
             transition: "{{reveal_transition}}",
             slideNumber: "{{reveal_number}}",
-            plugins: [RevealNotes, RevealMermaid],
+            plugins: [
+                      RevealNotes,
+                      {% if reveal_mermaid_js_url %}RevealMermaid,{% endif %}
+                     ],
             width: {{reveal_width}},
             height: {{reveal_height}},
         });