Specpart

This is used by the wavespectra packages (both wavespectra/wavespectra and metocean/wavespectra).

This repository is used to create pre-build binary wheels for windows.
Linux and macos are open to contributions.

Creation

Getting this to work was a bit of a trial-and-error. The following problems were encountered:

• not compiling, fixed by removing some of the statements from the generated .f90 file
• not working on the target machine due to missing .dll files (Importing created package fails with ImportError: DLL load failed)

The following steps were taken with help from the community:

• generated wrapper using f2py and specpart.f90 (not using pre-exising .pyf file) file

python -m numpy.f2py specpart.f90 -m specpart

• manually edited the generated .f90 wrapper file, removing sections:

use specpart, only : ptsort
use specpart, only : ptnghb
use specpart, only : pt_fld

• created meson build file: meson.build:
• set meson-python as build backend: pyproject.toml
• used Github Actions to perform the actual build on windows: actions

Attention points:

• As the target machine is not the same as the build machine, the dlls need to be bundeled: see discussion
• use delvewheel to inspect and repair created wheels. This includes all the required .dll files in the wheel
• delvewheel stores the repaired wheel in the /wheelhouse folder, this is uploaded as artifact.
• download the wheel and install it using pip

Checks:

• Importing works,
• Required functions are available:

Python 3.11.3 (tags/v3.11.3:f3909b8, Apr  4 2023, 23:49:59) [MSC v.1934 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import specpart
>>> specpart.specpart.partition
<fortran function partition>
>>> specpart.specpart.partition()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: specpart.specpart.partition() missing required argument 'spec' (pos 1)
>>> specpart.specpart.ihmax
array(200, dtype=int32)
>>> specpart.specpart.npart
array(0, dtype=int32)
>>>
> ``````


## Open questions

- Why is devewheel required when we do static linking?
- Why does devwheel not accept wildcards?