WARNING: Color theme None not found by pygments, falling back to XXX

[HealthyPear]

I have Sphinx v6.1.3 and pydata-sphinx-theme v0.13.1 and get these warning messages,

WARNING: Color theme None not found by pygments, falling back to tango.
WARNING: Color theme None not found by pygments, falling back to monokai.

After a make clean it works again, but it re-appears on re-builds.

On top of that, it seems to be erratic, I cannot reproduce this deterministically.

I found the same issue reported in executablebooks/sphinx-book-theme#690 and as far as I understand for them it's an upstream issue, so here I am!

Any takers?

[drammock]

I think I see how this is happening. Here:

pydata-sphinx-theme/src/pydata_sphinx_theme/__init__.py

Lines 955 to 958 in 956edcf

	# globalcontext sometimes doesn't exist so this ensures we do not error
	theme_name = _get_theme_options(app).get(style_key, None)
	if theme_name is None and hasattr(app.builder, "globalcontext"):
	theme_name = app.builder.globalcontext.get(f"theme_{style_key}")

we added the hasattr condition to prevent errors, but this allows theme_name to continue being None sometimes, which then triggers the warning on the subsequent lines.

I think the right fix here is to just not warn if theme_name is None... we really only need to warn if the user specifically asked for a highlighting theme that we can't actually deliver. I'll open a PR.

[12rambau]

I get this one sometimes for no reason and then it behaves normally again. Kudos if you find the root of the problem