Change build backend from flit to hatchling

.gitignore

@@ -154,3 +154,6 @@ cython_debug/
 
 # rever
 rever/
+
+# setuptools_scm
+_version.py

conda_libmamba_solver/__init__.py

@@ -1,6 +1,16 @@
 # Copyright (C) 2022 Anaconda, Inc
 # SPDX-License-Identifier: BSD-3-Clause
-__version__ = "22.8.1"
+
+try:
+    from ._version import version as __version__
+except ImportError:
+    try:
+        from importlib_metadata import version
+
+        __version__ = version("conda_libmamba_solver")
+        del version
+    except ImportError:
+        __version__ = "0.0.0.unknown"
 
 from warnings import warn as _warn
 

dev/bashrc_linux.sh

@@ -11,12 +11,11 @@ restore_e() {
 trap restore_e EXIT
 
 sudo /opt/conda/condabin/conda install -y -p /opt/conda \
-    "flit-core>=3.2,<4" \
     --file /opt/conda-libmamba-solver-src/dev/requirements.txt \
     --file /opt/conda-libmamba-solver-src/tests/requirements.txt
 
 cd /opt/conda-libmamba-solver-src
-sudo env FLIT_ROOT_INSTALL=1 /opt/conda/bin/python -m flit install --symlink --deps=none
+sudo /opt/conda/bin/python -m pip install -e . --no-deps
 
 cd /opt/conda-src
 export RUNNING_ON_DEVCONTAINER=${RUNNING_ON_DEVCONTAINER:-}

dev/requirements.txt

@@ -1,4 +1,7 @@
-libmambapy>=1.0
-libarchive
+# build-time
+pip
+# run-time
 conda>=22.9  # should be 22.11
 importlib-metadata
+libarchive
+libmambapy>=1.0

news/127-hatchling

@@ -0,0 +1,19 @@
+### Enhancements
+
+* <news item>
+
+### Bug fixes
+
+* <news item>
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* Change the build-system to `hatchling` + `hatch-cvs` for a `setuptools-scm`-like versioning setup. (#128 via #127)

pyproject.toml

@@ -1,6 +1,6 @@
 [build-system]
-requires = ["flit_core >=3.2,<4"]
-build-backend = "flit_core.buildapi"
+requires = ["hatchling", "hatch-vcs"]
+build-backend = "hatchling.build"
 
 [project]
 name = "conda-libmamba-solver"
@@ -37,8 +37,8 @@ homepage = "https://github.com/conda/conda-libmamba-solver"
 [project.entry-points.conda]
 conda-libmamba-solver = "conda_libmamba_solver.plugin"
 
-[tool.flit.module]
-name = "conda_libmamba_solver"
+[tool.hatch.version]
+source = "vcs"
 
 [tool.black]
 line-length = 99

recipe/meta.yaml

@@ -1,6 +1,6 @@
 package:
   name: "conda-libmamba-solver"
-  version: {{ GIT_DESCRIBE_TAG }}.{{ GIT_BUILD_STR }}
+  version: "{{ GIT_DESCRIBE_TAG }}.{{ GIT_BUILD_STR }}"
 
 source:
   # git_url is nice in that it won't capture devenv stuff.  However, it only
@@ -28,6 +28,13 @@ test:
     - conda_libmamba_solver
   commands:
     - CONDA_SOLVER=libmamba conda create -n test --dry-run scipy
+    - >-
+      python -c
+      "import conda_libmamba_solver as cls;
+      from importlib.metadata import version;
+      assert '{{ PKG_VERSION }}' == cls.__version__ == version('conda_libmamba_solver'),
+      '{{ PKG_VERSION }}' + f', {cls.__version__}, ' + version('conda_libmamba_solver')
+      "
 
 about:
   home: https://github.com/conda/conda-libmamba-solver