Revert "Update pygments version constraint in pyproject.toml" (#8979)

Author: mscolnick

Makefile

@@ -138,8 +138,7 @@ py-snapshots:
 	uv run --group test pytest \
 		tests/_server/templates/test_templates.py \
 		tests/_server/api/endpoints/test_export.py \
-		tests/test_api.py \
-		tests/test_project_dependencies.py
+		tests/test_api.py
 
 ##############
 # Packaging  #

marimo/_output/md.py

@@ -35,7 +35,7 @@ class PyconDetectorExtension(markdown.Extension):
     def extendMarkdown(self, md: markdown.Markdown) -> None:
         """Add the preprocessor to the markdown instance."""
         processor = PyconDetectorPreprocessor(md)
-        md.preprocessors.register(processor, "pycon_detector", 175)
+        md.preprocessors.register(processor, "pycon_detector", 30)
 
 
 class PyconDetectorPreprocessor(markdown.preprocessors.Preprocessor):
@@ -53,12 +53,9 @@ class PyconDetectorPreprocessor(markdown.preprocessors.Preprocessor):
 
     def __init__(self, md: markdown.Markdown) -> None:
         super().__init__(md)
-        # Pattern to match fenced code blocks (backreference \2 ensures the
-        # closing fence matches the opening fence marker, preventing greedy
-        # over-consumption of adjacent fenced blocks)
+        # Pattern to match fenced code blocks
         self.fence_pattern = re.compile(
-            r"^(\s*)(```+|~~~+)(\w*)\s*\n(.*?)^\s*\2\s*$",
-            re.MULTILINE | re.DOTALL,
+            r"^(\s*)```(\w*)\s*\n(.*?)^(\s*)```\s*$", re.MULTILINE | re.DOTALL
         )
 
     def run(self, lines: list[str]) -> list[str]:
@@ -67,14 +64,14 @@ def run(self, lines: list[str]) -> list[str]:
 
         def replace_fence(match: re.Match[str]) -> str:
             indent = match.group(1)
-            fence = match.group(2)
-            language = match.group(3) or ""
-            code = match.group(4)
+            language = match.group(2) or ""
+            code = match.group(3)
 
             # Only process if no language is specified
-            if not language and self._detect_pycon(code):
-                # Replace with pycon language
-                return f"{indent}{fence}pycon\n{code}{indent}{fence}"
+            if not language:
+                if self._detect_pycon(code):
+                    # Replace with pycon language
+                    return f"{indent}```pycon\n{code}{indent}```"
 
             # Return original
             return match.group(0)
@@ -253,10 +250,7 @@ def __init__(
             text,
             extensions=_get_extensions(),
             extension_configs=_get_extension_configs(),
-        )
-        if html_text is None:
-            html_text = ""
-        html_text = html_text.strip()
+        ).strip()
         # replace <p> tags with <span> as HTML doesn't allow nested <div>s in <p>s
         html_text = html_text.replace(
             "<p>", '<span class="paragraph">'

pyproject.toml

@@ -17,10 +17,10 @@ dependencies = [
     # compile markdown to html
     "markdown>=3.6,<4",
     # add features to markdown
-    # 10.21.2+ required for compatibility with pygments>=2.20 (filename=None fix).
-    "pymdown-extensions>=10.21.2,<11",
+    # Pinned to specific version for introduction of codeblock handling.
+    "pymdown-extensions>=10.15,<11",
     # syntax highlighting of code in markdown
-    "pygments>=2.20,<3",
+    "pygments>=2.19,<3",
     # for reading, writing configs
     "tomlkit>=0.12.0",
     # for managing frontmatter headers in markdown

tests/snapshots/dependencies.txt

@@ -8,8 +8,8 @@ msgspec>=0.20.0
 narwhals>=2.0.0
 packaging
 psutil>=5.0
-pygments>=2.20,<3
-pymdown-extensions>=10.21.2,<11
+pygments>=2.19,<3
+pymdown-extensions>=10.15,<11
 pyyaml>=6.0.1
 pyzmq>=27.1.0; python_version < '3.15'
 starlette>=0.37.2