Auto add matlab C/C++ headers to search path

[SpieringsAE]

Is your feature request related to a problem? Please describe.
I write a bit of Cmex and level 2 s functions in C, and it is quite annoying to not have proper function signatures and such for the C lsp. I think I can add these paths manually, but I wonder if it could be done automatically by this extension.

Describe the solution you'd like
Add available matlab C/C++ headers to search path, maybe based on the configured matlab path?

Describe alternatives you've considered
Manually extracting the path variable from matlab, formatting that and adding it to the search path maybe via the .vscode/settings.json file

[dklilley]

Hi @SpieringsAE, thanks for the request! To help better understand this, can you add reproduction steps as well as details about what behavior you are seeing and what behavior you would expect?

Thanks!

[SpieringsAE]

Okay
Reproduction:

1. In a matlab project make a C file, for example, my_cmex.c
2. Add #include "mex.h" to get access to the Matlab Cmex functions
3. Get an error/warning that mex.h is unknown
4. Have no autocomplete or information about the functions in mex.h as a result

Expected behaviour:
mex.h is detected and autocomplete/function documentation can be gathered from it.

To fix this manually I have added in .vscode/settings.json:

"C_Cpp.default.includePath": [
	"/home/user/.local/share/MATLAB/R2024a/extern/include/",
	"/home/user/.local/share/MATLAB/R2024a/simulink/include/",
	"/home/user/.local/share/MATLAB/R2024a/toolbox/rtw/accel/accelTemplateFolder",
	"/home/user/.local/share/MATLAB/R2024a/toolbox/rtw/targets/common/can/datatypes",
	"/home/user/.local/share/MATLAB/R2024a/toolbox/shared/can/src/scanutil",
	"/home/user/.local/share/MATLAB/R2024a/rtw/c/src"
]

These paths will be different depending on where Matlab is installed.

I'm not quite sure if these paths can be added by an extension like this.

[dklilley]

Thanks for adding that context!