Move logger config to CLI module

Previously we configured the root logger in the PMS package itself,
which would mean any code using the package as a library would get
the logging config as a side effect.

Rather than configure the root logger, which should be left to the
toplevel program, this re-scopes how we set the config to apply to
just the specific logger for the package.

src/pms/__init__.py

@@ -1,7 +1,5 @@
 import logging
-import os
 
-logging.basicConfig(level=os.getenv("LEVEL", "WARNING"))
 logger = logging.getLogger(__name__)
 
 

src/pms/cli.py

@@ -1,3 +1,5 @@
+import logging
+import os
 import sys
 from datetime import datetime
 from enum import Enum
@@ -25,6 +27,9 @@
     main.command(name=ep.name)(ep.load())
 
 
+logging.basicConfig(level=os.getenv("LEVEL", "WARNING"))
+
+
 def version_callback(value: bool):  # pragma: no cover
     if not value:
         return
@@ -45,8 +50,7 @@ def callback(
     version: Optional[bool] = Option(None, "--version", "-V", callback=version_callback),
 ):
     """Read serial sensor"""
-    if debug:  # pragma: no cover
-        logger.setLevel("DEBUG")
+    logger.setLevel("DEBUG" if debug else os.getenv("LEVEL", "WARNING"))
     ctx.obj = {"reader": SensorReader(model, port, seconds, samples)}