ENH: Rehaul meson build script (#133)

* MAINT: Bump to 3.9

3.8 is EOL for the past 8 months now.. and not built on CI anyway

xref: #117

* ENH: Rework meson build

Be more DRY

* ENH: Add use_openmp for meson

* ENH: Setup installation directory

Stop polluting site-packages with _scs*.so

* MAINT: Move to enable python -mpytest test

in the same directory, otherwise scs/__init__.py shadows the one
installed with python -mpip install .

* CI: Use meson for openmp

* MAINT: Add in rt similar to legacy_setup

* ENH: Add in more options from legacy_setup

* ENH: Try to setup the GPU variant

* CI: Fix typo

* MAINT: Try to explicitly take mkl

* MAINT: More typos

* MAINT: Try mkl again

* CI: Rework

* MAINT: Use configuration over CI

Author: HaoZeke

.github/workflows/build.yml

@@ -28,19 +28,19 @@ jobs:
       - uses: actions/checkout@v4
         with:
           submodules: recursive
-      - uses: conda-incubator/setup-miniconda@v3
+      - uses: prefix-dev/setup-[email protected]
         with:
-          auto-update-conda: true
-          python-version: ${{ matrix.python-version }}
-          miniforge-version: latest
-          channels: conda-forge,anaconda
+          cache: false
+          pixi-version: v0.46.0
+      - name: Add .pixi/envs/default to the $PATH
+        run: echo "$(pwd)/.pixi/envs/default/bin" >> $GITHUB_PATH
+        shell: bash
       - name: Install dependencies
-        run: |
-          conda install scipy numpy pytest 'setuptools<=60'
+        run: pixi add scipy numpy pip pytest meson meson-python openblas python==${{ matrix.python-version }}
       - name: Test
         run: |
-          python legacy_setup.py install --scs --openmp
-          pytest
+          pixi r python -m pip install -v . --no-build-isolation -Csetup-args=-Duse_openmp=true
+          pixi r pytest
           rm -rf build/
 
   build_mkl:
@@ -53,7 +53,7 @@ jobs:
       matrix:
         # macos-13 runners have intel chips. macos-14 and above
         # runners have Apple silicon chips.
-        os: [ ubuntu-latest, macos-13, windows-latest ]
+        os: [ ubuntu-latest ]
         python-version: [ 3.9, "3.10", "3.11", "3.12", "3.13"]
         link_mkl: [true]
 
@@ -70,39 +70,33 @@ jobs:
         shell: bash
         run: |
           echo "PYTHON_SUBVERSION=$(echo $PYTHON_VERSION | cut -c 3-)" >> $GITHUB_ENV
-      - uses: conda-incubator/setup-miniconda@v3
+      - uses: prefix-dev/setup-[email protected]
         with:
-          auto-update-conda: true
-          python-version: ${{ matrix.python-version }}
-          miniforge-version: latest
-          channels: conda-forge,anaconda
+          cache: false
+          pixi-version: v0.46.0
+      - name: Add .pixi/envs/default to the $PATH
+        run: echo "$(pwd)/.pixi/envs/default/bin" >> $GITHUB_PATH
+        shell: bash
       - name: Install dependencies
         run: |
           if [[ "$LINK_MKL" == "true" ]]; then
             BLAS_PKGS="blas-devel=*=*mkl"
           else
             BLAS_PKGS="blas-devel=*=*openblas"
           fi
-          if [[ "$PYTHON_VERSION" == "3.9" ]]; then
-            conda install scipy=1.5 numpy=1.19 pytest $BLAS_PKGS pkg-config
-          elif [[ "$PYTHON_VERSION" == "3.10" ]]; then
-            conda install scipy=1.7 numpy=1.21 pytest $BLAS_PKGS pkg-config
-          elif [[ "$PYTHON_VERSION" == "3.11" ]]; then
-            conda install scipy=1.9.3 numpy=1.23.4 pytest $BLAS_PKGS pkg-config
-          elif [[ "$PYTHON_VERSION" == "3.12" || "$PYTHON_VERSION" == "3.13" ]]; then
-            conda install scipy numpy pytest $BLAS_PKGS pkg-config
-          fi
+          pixi add $BLAS_PKGS pip scipy numpy pytest mkl mkl-devel pkg-config meson meson-python
       - name: Build
         run: |
-          python -c "import numpy as np; print('NUMPY BLAS INFOS'); print(np.show_config())"
+          pixi r python -c "import numpy as np;print(np.show_config())"
           if [[ "$LINK_MKL" == "true" ]]; then
-            python -m pip install --verbose -Csetup-args=-Dlink_mkl=true .
+
+            pixi r python -m pip install --verbose --no-build-isolation -Csetup-args=-Dlink_mkl=true .
           else
-            python -m pip install --verbose .
+            pixi r python -m pip install --verbose --no-build-isolation .
           fi
       - name: Test
         run: |
-          pytest
+          pixi r pytest
           rm -rf build/
 
   # from here to end it's a copy-paste, with few changes, of

.gitignore

@@ -48,3 +48,7 @@ out
 *.jar
 *.egg-info
 *.ipynb_checkpoints/
+
+# pixi environments
+.pixi
+*.egg-info