Add nox tool support

.config/requirements.in

@@ -5,6 +5,7 @@ click >= 7.1.2
 colorama  # for Windows
 diskcache >= 5.2.1
 importlib-metadata
+packaging
 pip>=21.0.1  # py_package
 pluggy
 pygments

pyproject.toml

@@ -58,6 +58,7 @@ pre-commit = "mk.tools.pre_commit:PreCommitTool"
 shell = "mk.tools.shell:ShellTool"
 taskfile = "mk.tools.taskfile:TaskfileTool"
 tox = "mk.tools.tox:ToxTool"
+nox = "mk.tools.nox:NoxTool"
 
 [tool.black]
 

src/mk/tools/nox.py

@@ -0,0 +1,47 @@
+"""
+Implementation of the nox tool support.
+"""
+
+from __future__ import annotations
+
+import json
+import logging
+from pathlib import Path
+
+from packaging.version import Version
+
+from mk.exec import run_or_fail
+from mk.tools import Action, Tool
+
+# This is the first version to support --json
+_MINIMUM_NOX_VERSION = Version("2023.04.22")
+
+
+class NoxTool(Tool):
+    name = "nox"
+
+    def is_present(self, path: Path) -> bool:
+        return (path / "noxfile.py").is_file()
+
+    def actions(self) -> list[Action]:
+        actions: list[Action] = []
+        version: str = run_or_fail(["nox", "--version"], tee=False).stderr.strip()
+        if Version(version) < _MINIMUM_NOX_VERSION:
+            logging.warning(
+                "Failed to retrieve nox sessions: "
+                "nox version %s is too old. Minimum supported version is %s.",
+                version,
+                _MINIMUM_NOX_VERSION,
+            )
+            return []
+        results = run_or_fail(["nox", "--list", "--json"], tee=False)
+        data = json.loads(results.stdout)
+        actions = [
+            Action(session["session"], tool=self, description=session["description"])
+            for session in data
+        ]
+        return actions
+
+    def run(self, action: Action | None = None) -> None:
+        cmd = ["nox"] if not action else ["nox", "-s", action.name]
+        run_or_fail(cmd, tee=True)