fix: do not parse markdown in math elements

seminare/style/markdown_extensions.py

@@ -4,6 +4,7 @@
 
 from markdown import Extension, Markdown
 from markdown.blockprocessors import BlockProcessor
+from markdown.postprocessors import Postprocessor
 from markdown.preprocessors import Preprocessor
 from markdown.treeprocessors import Treeprocessor
 
@@ -133,6 +134,34 @@ def fence_logic(self, parent, blocks):
         self.parser.parseBlocks(d, blocks)
 
 
+class MathPreprocessor(Preprocessor):
+    MATH_RE = re.compile(r"(?<!\\)(\$\$.*?\$\$|\$.*?\$)", re.DOTALL)
+
+    def run(self, lines: list[str]) -> list[str]:
+        text = "\n".join(lines)
+
+        if not hasattr(self.md, "math_stash"):
+            self.md.math_stash = []
+
+        def repl(match):
+            # No underscores, so markdown ignores it
+            placeholder = f"MATH_STASH_{len(self.md.math_stash)}_ENDSTASH"
+            self.md.math_stash.append(match.group(1))
+            return placeholder
+
+        new_text = self.MATH_RE.sub(repl, text)
+        return new_text.split("\n")
+
+
+class MathPostprocessor(Postprocessor):
+    def run(self, text: str) -> str:
+        if hasattr(self.md, "math_stash"):
+            for i, math_text in enumerate(self.md.math_stash):
+                placeholder = f"MATH_STASH_{i}_ENDSTASH"
+                text = text.replace(placeholder, math_text)
+        return text
+
+
 class SeminareExtension(Extension):
     def __init__(self, image_root: str | None = None, **kwargs) -> None:
         super().__init__(**kwargs)
@@ -152,3 +181,5 @@ def extendMarkdown(self, md: Markdown) -> None:  # noqa: N802
         md.parser.blockprocessors.register(
             IOOutputBlockProcessor(md.parser), "IO_output", 100000
         )
+        md.preprocessors.register(MathPreprocessor(md), "math_stash", 100005)
+        md.postprocessors.register(MathPostprocessor(md), "math_restore", 100005)

seminare/style/templates/root_base.html

@@ -13,9 +13,9 @@
   <link rel="stylesheet" href="{% static 'app.min.css' %}?v={% version %}">
   <link rel="stylesheet" href="{% static 'code.css' %}?v={% version %}">
 
-  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.15/dist/katex.min.css" integrity="sha384-Htz9HMhiwV8GuQ28Xr9pEs1B4qJiYu/nYLLwlDklR53QibDfmQzi7rYxXhMH/5/u" crossorigin="anonymous">
-  <script defer src="https://cdn.jsdelivr.net/npm/katex@0.16.15/dist/katex.min.js" integrity="sha384-bxmi2jLGCvnsEqMuYLKE/KsVCxV3PqmKeK6Y6+lmNXBry6+luFkEOsmp5vD9I/7+" crossorigin="anonymous"></script>
-  <script defer src="https://cdn.jsdelivr.net/npm/katex@0.16.15/dist/contrib/auto-render.min.js" integrity="sha384-hCXGrW6PitJEwbkoStFjeJxv+fSOOQKOPbJxSfM6G5sWZjAyWhXiTIIAmQqnlLlh" crossorigin="anonymous"></script>
+  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/katex@0.16.46/dist/katex.min.css" integrity="sha384-hW6ZmmePRD2f/9cuxGE6C9faGprtIBOme5OLUiEjtRKMTN67tY23ur9eAi21H8De" crossorigin="anonymous">
+  <script defer src="https://cdn.jsdelivr.net/npm/katex@0.16.46/dist/katex.min.js" integrity="sha384-FVvsvR4UzyIP8Y5hVvHjOfjVh+LWV78ll63SYx1t+nuuMPGMAihB8dJ2YsYyg1Wb" crossorigin="anonymous"></script>
+  <script defer src="https://cdn.jsdelivr.net/npm/katex@0.16.46/dist/contrib/auto-render.min.js" integrity="sha384-bjyGPfbij8/NDKJhSGZNP/khQVgtHUE5exjm4Ydllo42FwIgYsdLO2lXGmRBf5Mz" crossorigin="anonymous"></script>
 
   <script defer data-domain="{{ request.get_host|cut:"www." }}" event-user-authenticated="{{ request.user.is_authenticated|lower }}" event-user-staff="{{ request.user.is_staff|lower }}" src="https://analytics.trojsten.sk/js/script.pageview-props.js"></script>
 
@@ -122,7 +122,6 @@
             {left: '\\[', right: '\\]', display: true}
         ],
         macros: macros,
-        throwOnError: false
       });
     });
   </script>