Hi I m a pantsbuild newbie quite experienced with normal pan

Question

Hi I m a pantsbuild newbie quite experienced with normal pants jeans though wink There were some teasers about cython in the documentation but I couldn t find any actual plugin code Our current monorepo uses both Cython and f2py Are there any examples of the cython plugin and are there any plans for broader support for C fortran extensions

hundreds-father-404 · Answer

Hey Noah welcome joy glad to have you Indeed a user wrote a Cython plugin near the end of last year It s not upstreamed but I think they shared it in < C01CQHVDMMW|plugins> Let me try finding it How are y all using Cython I ve seen a couple different ways to invoke it We would definitely be interested in better first class support and we re happy to help you with writing a plugin whether you upstream it or not

early-toothbrush-63898 · Answer

Thanks We use cython in a similar way to the <https cython readthedocs io en latest src userguide source files and compilation html configuring the c build|setup py> example in the docs For fortran extension modules we have something like this ```from numpy distutils core import Extension setup setup packages=find packages ext modules= Extension name= package fortran sources=glob src f90 ```

flat-zoo-31952 · Answer

~i would hazard a guess that using the <https cython readthedocs io en latest src userguide source files and compilation html compiling from the command line|command line> based compilation is the best way to go since that seems simpler than trying to integrate with setuptools~ nevermind you would need to manually manage C compilation after that

hundreds-father-404 · Answer

gt a similar way to the setup py example in the docs Cool that is what the other user Noah Pederson was using See and the threads a little after for convos related to Noah s plugin It looks like this is the latest gist we have That first thread explains a bit how you will be using the codegen plugin hook so that Pants knows how to convert your ` pyx` files into something like a ` so` file Also refer to the plugin docs starting with A couple people have commented that the hardest part of writing a plugin is figuring out what the heck you want it to do it s really helpful if you know what commands you d run without Pants to get this done Pants is more or less an orchestrator for other tools

hundreds-father-404 · Answer

gt It s really helpful if you know what commands you d run without Pants to get this done Pants is more or less an orchestrator for other tools We re happy to talk through this and any later parts Feel free to start a thread in < C01CQHVDMMW|plugins> I d probably recommend this workflow 1 Confirm if you want to stick with setup py vs using the CLI Either are valid Josh is probably right that CLI may be simpler but it would mean rewriting your current workflow + Noah s example not being as helpful so maybe not 2 Write down how you do this without Pants including what commands you run 3 check out the basics of writing a plugin Get an example working with the Target API which is simpler than the Rules API This will ensure you have things loading correctly 4 read over the Rules API docs you don t need to fully understand everything at this point 5 follow that guide + Noah s example to use the codegen hook

early-toothbrush-63898 · Answer

Thanks for sharing Eric That does look pretty straightforward after perusing the plugin developer docs last night great job on these btw Josh yah that was my concern codegen to C but then what Plugging into setup py seems a little easier