ci: use pixi in CI

.github/workflows/main.yml

@@ -20,66 +20,18 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: ["3.7", "3.8", "3.9", "3.10"]
+        python-version: ["3.7", "3.9", "3.11", "3.12"]
 
     steps:
-    - uses: actions/checkout@v1
+    - uses: actions/checkout@v4
 
-    - name: Install mamba
-      uses: mamba-org/provision-with-micromamba@main
+    - uses: prefix-dev/[email protected]
       with:
-        environment-file: dev-environment.yml
-        environment-name: pybind11_json
-        micromamba-version: "0.22.0"
-        extra-specs: python=${{ matrix.python-version }}*=*_cpython
+        pixi-version: v0.17.1
+        cache: false
 
-    - name: Make build directory
-      run: mkdir build
+    - name: Run build
+      run: pixi run build
 
-    - name: Micromamba shell hook
-      if: matrix.os == 'windows-latest'
-      shell: powershell
-      run: |
-        micromamba shell hook -s cmd.exe -p C:\Users\runneradmin\micromamba-root
-
-    - name: Unix, install
-      if: matrix.os != 'windows-latest'
-      run: |
-        micromamba activate pybind11_json
-        cmake .. \
-          -D CMAKE_INSTALL_PREFIX=$CONDA_PREFIX \
-          -D DOWNLOAD_GTEST=ON \
-          -D PYTHON_EXECUTABLE=`which python` \
-          -D CMAKE_INSTALL_LIBDIR=lib
-        make install -j2
-      working-directory: build
-
-    - name: Windows, install
-      if: matrix.os == 'windows-latest'
-      shell: cmd
-      run: |
-        call C:\Users\runneradmin\micromamba-root\condabin\micromamba.bat activate pybind11_json
-        cmake .. ^
-          -G Ninja ^
-          -D CMAKE_INSTALL_PREFIX="%CONDA_PREFIX%\Library" ^
-          -D DOWNLOAD_GTEST=ON ^
-          -D gtest_force_shared_crt=ON ^
-          -D CMAKE_CXX_FLAGS=/D_SILENCE_TR1_NAMESPACE_DEPRECATION_WARNING
-        ninja install
-      working-directory: build
-
-    - name: Unix, Run tests
-      if: matrix.os != 'windows-latest'
-      run: |
-        micromamba activate pybind11_json
-        ./test_pybind11_json
-      working-directory: build/test
-
-    - name: Windows, Run tests
-      if: matrix.os == 'windows-latest'
-      shell: cmd
-      run: |
-        call C:\Users\runneradmin\micromamba-root\condabin\micromamba.bat activate pybind11_json
-        set PYTHONHOME=%CONDA_PREFIX%
-        test_pybind11_json
-      working-directory: build/test
+    - name: Run tests
+      run: pixi run test

.gitignore

@@ -1 +1,2 @@
 build/*
+.pixi

pixi.toml

@@ -0,0 +1,56 @@
+[project]
+name = "pybind11_json"
+channels = ["conda-forge"]
+platforms = ["win-64", "linux-64", "osx-64", "osx-arm64"]
+
+[dependencies]
+python = ">=3.7"
+
+# Build dependencies
+cmake = "*"
+cxx-compiler = "*"
+ninja = "*"
+# Host dependencies
+nlohmann_json = "*"
+pybind11 = "*"
+
+[tasks.test]
+cmd = "./build/test/test_pybind11_json"
+depends_on = ["build"]
+
+[tasks.configure]
+cmd = [
+    "cmake",
+    "-GNinja",
+    "-S.",
+    "-Bbuild",
+    "-DDOWNLOAD_GTEST=ON",
+    "-DCMAKE_INSTALL_LIBDIR=lib",
+    "-DCMAKE_INSTALL_PREFIX=$CONDA_PREFIX",
+]
+inputs = ["CMakeLists.txt"]
+outputs = ["build/CMakeFiles/"]
+
+[target.win-64.tasks.configure]
+cmd = [
+    "cmake",
+    "-GNinja",
+    "-S.",
+    "-Bbuild",
+    "-Dgtest_force_shared_crt=ON",
+    "-DDOWNLOAD_GTEST=ON",
+    "-DCMAKE_INSTALL_LIBDIR=Library",
+    "-DCMAKE_INSTALL_PREFIX=$CONDA_PREFIX",
+]
+
+
+[tasks.build]
+cmd = ["cmake", "--build", "build"]
+depends_on = ["configure"]
+inputs = [
+    "CMakeLists.txt",
+    "src/*"
+]
+outputs = [
+    "build/"
+]

test/CMakeLists.txt

@@ -6,7 +6,7 @@
 # The full license is in the file LICENSE, distributed with this software. #
 ############################################################################
 
-cmake_minimum_required(VERSION 3.4.3)
+cmake_minimum_required(VERSION 3.5)
 
 if (CMAKE_CURRENT_SOURCE_DIR STREQUAL CMAKE_SOURCE_DIR)
     project(pybind11_json-test)

test/copyGTest.cmake.in

@@ -6,7 +6,7 @@
 # The full license is in the file LICENSE, distributed with this software. #
 ############################################################################
 
-cmake_minimum_required(VERSION 2.8.2)
+cmake_minimum_required(VERSION 3.5)
 
 project(googletest-download NONE)
 

test/downloadGTest.cmake.in

@@ -6,14 +6,14 @@
 # The full license is in the file LICENSE, distributed with this software. #
 ############################################################################
 
-cmake_minimum_required(VERSION 2.8.2)
+cmake_minimum_required(VERSION 3.5)
 
 project(googletest-download NONE)
 
 include(ExternalProject)
 ExternalProject_Add(googletest
     GIT_REPOSITORY    https://github.com/google/googletest.git
-    GIT_TAG           release-1.8.0
+    GIT_TAG           release-1.12.1
     SOURCE_DIR        "${CMAKE_CURRENT_BINARY_DIR}/googletest-src"
     BINARY_DIR        "${CMAKE_CURRENT_BINARY_DIR}/googletest-build"
     CONFIGURE_COMMAND ""