fix(convert): blank web page when converting multiple slides into HTML (#497)

* fix(convert): Blank web page when converting multiple slides into HTML

* chore(docs): add changelog

* Fix typo

CHANGELOG.md

@@ -34,6 +34,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
   and `av<14`, as their syntax differ, but the former doesn't
   provide binary wheels for Python 3.9.
   [#494](https://github.com/jeertmans/manim-slides/pull/494)
+- Fixed blank web page when converting multiple slides into HTML.
+  [#497](https://github.com/jeertmans/manim-slides/pull/497)
 
 (v5.1.9)=
 ## [v5.1.9](https://github.com/jeertmans/manim-slides/compare/v5.1.8...v5.1.9)

manim_slides/convert.py

@@ -453,6 +453,7 @@ class RevealJS(Converter):
                 get_duration_ms=get_duration_ms,
                 has_notes=has_notes,
                 env=os.environ,
+                prefix=prefix if not self.data_uri else None,
                 **options,
             )
 

manim_slides/templates/revealjs.html

@@ -25,7 +25,7 @@
             {%- if data_uri -%}
               {% set file = file_to_data_uri(slide_config.file) %}
             {%- else -%}
-              {% set file = assets_dir / slide_config.file.name %}
+              {% set file = assets_dir / (prefix(outer_loop.index0) + slide_config.file.name) %}
             {%- endif -%}
         <section
           data-background-size={{ background_size }}