switch to pixi from spin

.gitattributes

+# GitHub syntax highlighting
+pixi.lock linguist-language=YAML linguist-generated=true

.gitignore

@@ -41,3 +41,6 @@ coverage.xml
 docs/_build/
 
 .idea/
+# pixi environments
+.pixi
+*.egg-info

.gitlab-ci.yml

-image: mambaorg/micromamba:1.5.6-jammy
+image: ghcr.io/prefix-dev/pixi:0.29.0
 
-cache:
-  paths:
-    - micromamba
-    - .pre-commit-cache
-before_script:
-  - mkdir -p micromamba
-  - export MAMBA_ROOT_PREFIX=micromamba
-  - micromamba create -yf environment.yml
-  - eval "$(micromamba shell hook --shell bash)"
-  - micromamba activate mumps
-  - git config --global --add safe.directory $CI_PROJECT_DIR
 variables:
-  PRE_COMMIT_HOME: $CI_PROJECT_DIR/.pre-commit-cache
+  FF_USE_FASTZIP: "true"
+  CACHE_COMPRESSION_LEVEL: "fastest"
 
-build and test:
+pre-commit:
+  variables:
+    PRE_COMMIT_HOME: $CI_PROJECT_DIR/.pre-commit-cache
   script:
-    - spin test
+    - pixi run -e precommit git config --global --add safe.directory $CI_PROJECT_DIR
+    - pixi run check
+  cache:
+    key: "$CI_JOB_NAME"
+    paths:
+      - .pre-commit-cache
+      - .pixi
 
-pre-commit:
+test:
+  script:
+    - pixi run test
+  cache:
+    key: "$CI_JOB_NAME"
+    paths:
+      - .pixi
+
+build:
   script:
-    - pre-commit run --all-files
+    - pixi run -e publish uv build --sdist
+    - pixi run -e publish twine check dist/*
+  artifacts:
+    paths:
+      - dist
+    expire_in: "7 days"
+  cache:
+    key: "$CI_JOB_NAME"
+    paths:
+      - .pixi
 
 publish to test pypi:
   needs:
-    - build and test
+    - test
+    - build
     - pre-commit
   rules:
     - if: '$CI_COMMIT_TAG =~ /^v[0-9]+\.[0-9]+\.[0-9]+.*\+test$/' # vX.Y.Z.post1+test
   script:
-    - python -m build
-    - mkdir wheelhouse && mv dist/*.whl wheelhouse
-    - auditwheel repair --plat manylinux_2_12_x86_64 wheelhouse/*.whl -w dist
-    - twine check dist/*
-    - twine upload -u __token__ -p $PYPI_TEST_TOKEN --repository testpypi dist/*
+    - pixi run -e publish twine upload -u __token__ -p $PYPI_TEST_TOKEN --repository testpypi dist/*
+  cache:
+    key: "$CI_JOB_NAME"
+    paths:
+      - .pixi
 
 publish to pypi:
   needs:
-    - build and test
+    - test
+    - build
     - pre-commit
   rules:
     - if: '$CI_COMMIT_TAG =~ /^v[0-9]+\.[0-9]+\.[0-9]+[^+]*$/' # No +test
   script:
-    - python -m build
-    - mkdir wheelhouse && mv dist/*.whl wheelhouse
-    - auditwheel repair --plat manylinux_2_12_x86_64 wheelhouse/*.whl -w dist
-    - twine check dist/*
-    - twine upload -u __token__ -p $PYPI_TOKEN dist/*
+    - pixi run -e publish twine upload -u __token__ -p $PYPI_TOKEN dist/*
+  cache:
+    key: "$CI_JOB_NAME"
+    paths:
+      - .pixi

README.md

@@ -59,16 +59,28 @@ def sparse_diag(matrix, k, sigma, **kwargs):
 
 ## Development
 
-`python-mumps` recommends [Spin](https://github.com/scientific-python/spin/). Get spin with:
+### Pixi
+
+`python-mumps` recommends [pixi](https://pixi.sh/).
+
+After installing pixi, use
+
+```bash
+pixi run test -v  # (Pytest arguments go after test)
+```
+
+This will also install the necessary dependencies.
+
+### pre-commit
+
+`python-mumps` uses [pre-commit](https://pre-commit.com/) to enforce code style. After installing it, run
 
 ```bash
-pip install spin
+pre-commit install
 ```
 
-Then to build, test and install `python-mumps`:
+or if you want to use pre-commit provided by pixi, run
 
 ```bash
-spin build
-spin test -- --lf  # (Pytest arguments go after --)
-spin install
+pixi run pre-commit install
 ```

environment.yml

-name: mumps
-channels: [conda-forge]
-dependencies:
-  - mumps-seq=5.2
-  - metis=5.1.0
-  - pip
-  - python=3.11
-  - build
-  - numpy
-  - scipy
-  - meson
-  - ninja
-  - compilers
-  - cython
-  - pytest
-  - twine
-  - pre-commit
-  - git
-  - patchelf
-  - auditwheel
-  - pip:
-    - spin

pyproject.toml

@@ -39,14 +39,6 @@ dynamic = ["version"]
 [project.urls]
 homepage = "https://gitlab.kwant-project.org/kwant/python-mumps"
 
-[tool.spin]
-package = "mumps"
-commands = [
-  "spin.cmds.meson.build",
-  "spin.cmds.meson.test",
-  "spin.cmds.pip.install"
-]
-
 [tool.ruff.pydocstyle]
 convention = "numpy"
 
@@ -58,3 +50,45 @@ line-length = 88
 
 [tool.codespell]
 ignore-words-list = "groth,coo"
+
+[tool.pixi.project]
+channels = ["conda-forge"]
+platforms = ["linux-64"]
+
+[tool.pixi.pypi-dependencies]
+python-mumps = { path = ".", editable = true }
+
+[tool.pixi.dependencies]
+mumps-seq = ">=5.7.3,<6"
+scipy = ">=1.14.1,<2"
+numpy = ">=2.1.1,<3"
+setuptools_scm = ">=8.1.0,<9"
+meson-python = ">=0.16.0,<0.17"
+compilers = ">=1.7.0,<2"
+ninja = ">=1.12.1,<2"
+cython = ">=3.0.11,<4"
+pytest = ">=8.3.2,<9"
+git = "*"
+
+[tool.pixi.feature.publish.dependencies]
+uv = ">=0.4.5"
+twine = ">=5.1.1"
+
+[tool.pixi.feature.precommit.dependencies]
+pre-commit = "*"
+git = "*"
+
+[tool.pixi.pypi-options]
+no-build-isolation = ["python-mumps"]
+
+[tool.pixi.environments]
+default = { solve-group = "default" }
+precommit = { features = ["precommit"], no-default-feature = true }
+publish = { features = ["publish"] }
+
+[tool.pixi.tasks]
+test = "python -P -m pytest --import-mode=importlib --pyargs mumps"
+
+[tool.pixi.feature.precommit.tasks]
+check = "pre-commit run --all-files"
+pre-commit = "pre-commit"