wip: testing package extension

[franckgaga]

Take 2 of #296

@baggepinnen, do you have experience with package extension? I tried to add a simple package extension LinearMPCext in this PR, and no matter what, I'm not able to call the dummy hi function. Do you spot an obvious problem? I used ChatGPT and Claude to revise the file structure and my Project.toml and they were not helpful at all.

The goal here would be to load the code generation tools only if LinearMPC is available and loaded.

Many thanks!

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.53%. Comparing base (399968e) to head (6205caf).

Files with missing lines	Patch %	Lines
ext/LinearMPCext.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #297      +/-   ##
==========================================
- Coverage   98.55%   98.53%   -0.02%     
==========================================
  Files          28       29       +1     
  Lines        4967     4968       +1     
==========================================
  Hits         4895     4895              
- Misses         72       73       +1     

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[baggepinnen]

Package extensions cannot export new functions, or anything new at all. You have to define

function hi end

In the main package, and import it and extend it in the extension.

[franckgaga]

Oh that is why! I may open a PR in the Julia documentation since I don't think it's mentioned AFAIK and I lost a fair amount of time understanding why.

edit: it is, but in the dev version of the documentation, thanks to Guillaume, here : https://github.com/JuliaLang/Pkg.jl/pull/3552/files

[franckgaga]

Will close it for now, thanks for the tips.