Added support for .env files

.env.example

@@ -0,0 +1,2 @@
+GARMIN_USERNAME=<your username / email>
+GARMIN_PASSWORD=<your password>

.gitignore

@@ -3,3 +3,4 @@
 dist/
 .idea
 *.json
+.env

README.md

@@ -51,6 +51,9 @@ You can use the following environment variables for providing the Garmin and/or
 - `TRAINERROAD_USERNAME`
 - `TRAINERROAD_PASSWORD`
 
+The CLI also uses python-dotenv to populate the variables above. Therefore setting the environment variables
+has the same effect as placing the variables in a `.env` file in the working directory.
+
 ### Providing credentials via secrets files
 
 You can also populate the following 'secrets' files to provide the Garmin and/or Trainerroad credentials:
@@ -67,7 +70,7 @@ Secrets are useful in an orchestrated container context — see the [Docker Swar
 In the case of credentials being available via multiple means (e.g. [environment variables](#providing-credentials-via-environment-variables) and [secrets files](#providing-credentials-via-secrets-files)), the order of resolution for determining which credentials to use is as follows, with later methods overriding credentials supplied by an earlier method:
 
 1. Read secrets file(s)
-2. Read environment variable(s)
+2. Read environment variable(s), variables set explicitly take precedence over values from a `.env` file.
 3. Use command invocation argument(s)
 
 ### Obtaining Withings Authorization Code

setup.py

@@ -26,7 +26,7 @@ def read(fname):
         "Topic :: Utilities",
         "License :: OSI Approved :: MIT License",
     ],
-    install_requires=["lxml", "requests", "garth"],
+    install_requires=["lxml", "requests", "garth", "python-dotenv"],
     entry_points={
         "console_scripts": ["withings-sync=withings_sync.sync:main"],
     },

withings_sync/sync.py

@@ -5,6 +5,7 @@
 import os
 import logging
 import json
+import dotenv
 
 from datetime import date, datetime
 from importlib.metadata import version
@@ -26,6 +27,8 @@
 except OSError:
     GARMIN_PASSWORD = ""
 
+dotenv.load_dotenv()
+
 if "GARMIN_USERNAME" in os.environ:
     GARMIN_USERNAME = os.getenv("GARMIN_USERNAME")