MNT: Use backports.zstd instead of pyzstd as primary dependency

Author: pauldmccarthy

.pre-commit-config.yaml

@@ -31,7 +31,7 @@ repos:
           - types-Pillow
           - pydicom
           - numpy
-          - pyzstd
+          - backports.zstd
           - importlib_resources
         args: ["nibabel"]
         pass_filenames: false

pyproject.toml

@@ -58,7 +58,7 @@ dicomfs = ["nibabel[dicom]", "pillow >=8.4"]
 minc2 = ["h5py >=3.5"]
 spm = ["scipy >=1.8"]
 viewers = ["matplotlib >=3.5"]
-zstd = ["pyzstd >=0.15.2"]
+zstd = ["backports.zstd; python_version<'3.14'"]
 # For doc and test, make easy to use outside of tox
 # tox should use these with extras instead of duplicating
 doc = [

tox.ini

@@ -77,17 +77,15 @@ extras =
   # Simple, thanks Hugo and Paul
   !none: dicomfs
   !none: indexed_gzip
+  !none: zstd
 
   # Minimum dependencies
   min: minc2
   min: spm
   min: viewers
-  min: zstd
 
   # Matplotlib has wheels for everything except win32 (x86)
   {full,pre}-{x,arm}64: viewers
-  # No free-threaded wheels for: zstd
-  py3{9,10,11,12,13,14}-{full,pre}-{x,arm}64: zstd
 
   {full,pre}-{x,arm}64: spm
 
@@ -179,7 +177,7 @@ deps =
   types-Pillow
   pydicom
   numpy
-  pyzstd
+  backports.zstd
   importlib_resources
   typing_extensions
 skip_install = true