Merge pull request #86 from Cronocide/main

Added support for configuration from ENV

README.md

@@ -41,7 +41,7 @@ A Python script to download Apple Music songs/music videos/albums/playlists. Thi
     ```
 
 ## Configuration
-You can configure gamdl by using the command line arguments or the config file. The config file is created automatically when you run gamdl for the first time at `~/.gamdl/config.json` on Linux and `%USERPROFILE%\.gamdl\config.json` on Windows. Config file values can be overridden using command line arguments.
+You can configure gamdl by using the command line arguments, environment variables, or the config file. The config file is created automatically when you run gamdl for the first time at `~/.gamdl/config.json` on Linux and `%USERPROFILE%\.gamdl\config.json` on Windows. Environment variables are prefixed with `GAMDL_` and are the capitalized config file key for their respective option. Config file values and environment variables can be overridden using command line arguments.
 | Command line argument / Config file key                         | Description                                                            | Default value                      |
 | --------------------------------------------------------------- | ---------------------------------------------------------------------- | ---------------------------------- |
 | `-f`, `--final-path` / `final_path`                             | Path where the downloaded files will be saved.                         | `./Apple Music`                    |

gamdl/cli.py

@@ -1,11 +1,11 @@
 from __future__ import annotations
 
+import os
 import json
 import logging
 from pathlib import Path
 
 import click
-
 from . import __version__
 from .constants import *
 from .downloader import Downloader
@@ -26,18 +26,23 @@ def no_config_callback(
     ctx: click.Context, param: click.Parameter, no_config_file: bool
 ) -> click.Context:
     if no_config_file:
+        for param in ctx.command.params:
+            env_param = "GAMDL_" + param.name.upper().replace("-", "_")
+            if os.getenv(env_param) is not None:
+                 ctx.params[param.name] = param.type_cast_value(ctx, os.getenv(env_param))
         return ctx
     if not ctx.params["config_location"].exists():
         write_default_config_file(ctx)
     with open(ctx.params["config_location"], "r") as f:
         config_file = dict(json.load(f))
     for param in ctx.command.params:
-        if (
-            config_file.get(param.name) is not None
-            and not ctx.get_parameter_source(param.name)
-            == click.core.ParameterSource.COMMANDLINE
-        ):
-            ctx.params[param.name] = param.type_cast_value(ctx, config_file[param.name])
+        if (not ctx.get_parameter_source(param.name)
+            == click.core.ParameterSource.COMMANDLINE):
+            if config_file.get(param.name) is not None:
+                ctx.params[param.name] = param.type_cast_value(ctx, config_file[param.name])
+            env_param = "GAMDL_" + param.name.upper().replace("-", "_")
+            if os.getenv(env_param) is not None:
+                ctx.params[param.name] = param.type_cast_value(ctx, os.getenv(env_param))
     return ctx