Allow setting path to config file via env args (#611)

* Enable passing path to config file via env args

* Remove println

* Update comment

* Remove unwanted file

* Update CHANGELOG

CHANGELOG.md

@@ -7,6 +7,10 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- Allow setting config file path via environment variables [#611](https://github.com/p2panda/aquadoggo/pull/611)
+
 ## [0.7.1]
 
 ### Added

aquadoggo_cli/Cargo.toml

@@ -21,7 +21,7 @@ doc = false
 
 [dependencies]
 anyhow = "1.0.62"
-clap = { version = "4.1.8", features = ["derive", "cargo"] }
+clap = { version = "4.1.8", features = ["derive", "cargo", "env"] }
 colored = "2.0.4"
 directories = "5.0.1"
 env_logger = "0.9.0"

aquadoggo_cli/src/config.rs

@@ -28,7 +28,8 @@ type ConfigFilePath = Option<PathBuf>;
 /// Returns a partly unchecked configuration object which results from all of these sources. It
 /// still needs to be converted for aquadoggo as it might still contain invalid values.
 pub fn load_config() -> Result<(ConfigFilePath, ConfigFile)> {
-    // Parse command line arguments first to get optional config file path
+    // Parse command line arguments and CONFIG environment variable first to get optional config 
+    // file path
     let cli = Cli::parse();
 
     // Determine if a config file path was provided or if we should look for it in common locations
@@ -74,7 +75,7 @@ struct Cli {
     /// When not set the program will try to find a `config.toml` file in the same folder the
     /// program is executed in and otherwise in the regarding operation systems XDG config
     /// directory ("$HOME/.config/aquadoggo/config.toml" on Linux).
-    #[arg(short = 'c', long, value_name = "PATH")]
+    #[arg(short = 'c', long, value_name = "PATH", env)]
     #[serde(skip_serializing_if = "Option::is_none")]
     config: Option<PathBuf>,