Make cli args configurable through env variables

Cargo.toml

@@ -19,4 +19,4 @@ chrono = "0.4.38"
 thiserror = "1.0.65"
 log = "0.4.22"
 simple_logger = { version = "5.0.0", default-features = false, features = ["timestamps"] }
-clap = { version = "4.5.20", features = ["derive"] }
+clap = { version = "4.5.20", features = ["derive", "env"] }

README.md

@@ -69,7 +69,7 @@ You may have a look in the Space API specification on how to fill the fields.
 
 By default, the app will look for both the configuration (`config.json`) and template (`template.json`) files in the current working directory.
 
-In case the files are located somewhere different, you can use the optional commandline arguments to provide the correct paths.
+In case the files are located somewhere different, you can use the optional commandline arguments or their corresponding environment variables to provide the correct paths.
 Just run `./k4status --help` to show their usage.
 
 Next to the file paths, you can adjust the log level.

src/main.rs

@@ -11,12 +11,12 @@ const FILE_CONFIG: &str = "config.json";
 const FILE_TEMPLATE: &str = "template.json";
 
 #[derive(Parser, Debug)]
-#[command(version, about, long_about = None)]
+#[command(version, about)]
 struct Args {
-    #[arg(short, long, default_value = FILE_CONFIG)]
+    #[arg(short, long, env = "K4S_CONFIG", default_value = FILE_CONFIG)]
     config: String,
 
-    #[arg(short, long, default_value = FILE_TEMPLATE)]
+    #[arg(short, long, env = "K4S_TEMPLATE", default_value = FILE_TEMPLATE)]
     template: String,
 }