Unable to change pygments_style in _config.yml

[martinSDT]

Hello all

Describe the bug

When I add to the _config.yml file

sphinx:
  recursive_update: true
  config:
    pygments_style: pygments.styles.xcode.XcodeStyle

I expect the style "xcode" to be used to highlight syntax in code blocks
But instead code blocks are always colored the same way, whatever the provided pygments_style

I tried to assign a class that does not exist (pygments.styles.xcode.XcodeStyle2) and this results in an error during book building

Exception occurred:
  File "C:\Users\Martin\AppData\Roaming\Python\Python39\site-packages\sphinx\highlighting.py", line 89, in get_style
    return getattr(import_module(module), stylename)
AttributeError: module 'pygments.styles.xcode' has no attribute 'XcodeStyle2'

=> This suggests that the pygments style is somehow "read" (when an existing class is provided), but not used as I would expect.

I would like to customize the syntax highlighting and thus first need to check the possibility to change pygments_style before diving into custom lexer, custom style, etc.

Reproduce the bug

1. Unzip the sample source code mynewbook.zip
   It contains a MATLAB code block in the file mynewbook/markdown.md
   And the option below in _config.yml

sphinx:
  recursive_update: true
  config:
    pygments_style: pygments.styles.xcode.XcodeStyle

2. Build the book with

jupyter-book build mynewbook/

3. Observe that the code highlighting is the same with and without the pygments_style option.
4. To see the expected output, you can go to this page https://pygments.org/demo/
   Select
   Language = Matlab
   Style = xcode
   And paste the following code under Enter some code :

rxnList = {'PCHOLP_hs_f', 'PLA2_2_f', 'SMS_f','PCHOLP_hs_b', 'PLA2_2_b', 'SMS_b'};
c = [1, 1, 1, 1, 1, 1]; % This is a comment
d = 10;
ineqSense = 'G';
modelConstrained = constrainRxnListAboveBound(modelIrrev, rxnList, C, d, ineqSense);

Thanks in advance for your help and time ! :)

List your environment

Jupyter Book : 0.15.1
External ToC : 0.3.1
MyST-Parser : 0.18.1
MyST-NB : 0.17.2
Sphinx Book Theme : 1.0.1
Jupyter-Cache : 0.6.1
NbClient : 0.7.4

Python 3.9
OS : Windows 11

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[72757373656c6c]

I see that you are using the Sphinx Book Theme which inherits from pydata. The pydata doc says "Configure pygments themes" using:

html_theme_options = {
   ...
   "pygment_light_style": "tango",
   "pygment_dark_style": "monokai"
}

And,

Danger
The native Sphinx option pygments_style will be overwritten by this theme.

Any difference if you use pygment_{light,dark}_style?

I am having a similar issue with the sphinx_book_theme. Can't seem to change the default styles tango and monokai to anything else. If I use a nonexistent style, I get a message, "Highlighting style atest not found by pygments, falling back to tango.". But if I use a valid style from the output of pygmentize -L styles, there is no message but pygment style doesn't change either in the html output.