use tomllib and update action (#30)

* use tomllib and update action

* update action

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

* detect runner os

* syntax

* use single step

* use version_info

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

action.yml

@@ -41,14 +41,16 @@ runs:
   steps:
   - name: create environment file
     run: >
-      pip3 install tomli packaging pyyaml &&
+      pip3 install tomli packaging pyyaml $PIP_OPTIONS &&
       python3 $GITHUB_ACTION_PATH/pydeps2env/generate_environment.py ${{ inputs.files }}
       --output ${{ inputs.output }}
       --channels ${{ inputs.channels }}
       --extras ${{ inputs.extras }}
       --build_system ${{ inputs.build_system }}
       --pip ${{ inputs.pip }}
     shell: bash
+    env:
+      PIP_OPTIONS: ${{ runner.os == 'macOS' && '--break-system-packages' || '' }}
   - name: show environment file
     run: cat ${{ inputs.output }}
     shell: bash

pydeps2env/environment.py

@@ -5,10 +5,15 @@
 from pathlib import Path
 from collections import defaultdict
 import configparser
-import tomli as tomllib
+import sys
 import yaml
 import warnings
 
+if sys.version_info < (3, 11):
+    import tomli as tomllib
+else:
+    import tomllib
+
 
 def clean_list(item: list, sort: bool = True) -> list:
     """Remove duplicate entries from a list."""

pyproject.toml

@@ -31,7 +31,7 @@ dynamic = [
 dependencies = [
   "packaging",
   "pyyaml",
-  "tomli",
+  'tomli; python_version < "3.11"',
 ]
 [project.optional-dependencies]
 test = [