🔧 add config-rs

src/main.rs

@@ -1,5 +1,7 @@
 use clap::{Parser, Subcommand};
 
+mod settings;
+
 #[derive(Parser)]
 #[command(author, version, about, long_about = None)]
 struct Cli {
@@ -14,6 +16,9 @@ enum Commands {
 }
 
 fn main() {
+    let cfg = settings::Settings::new();
+    println!("Config parsed: {:?}", cfg);
+
     let cli = Cli::parse();
 
     match &cli.command {

src/settings.rs

@@ -0,0 +1,19 @@
+use config::{Config, ConfigError, Environment, File};
+use serde::Deserialize;
+
+#[derive(Debug, Deserialize)]
+#[allow(unused)]
+pub struct Settings {
+    pub foo: Option<String>,
+}
+
+impl Settings {
+    pub fn new() -> Result<Self, ConfigError> {
+        let s = Config::builder()
+            .add_source(File::with_name("marvin").required(false))
+            .add_source(Environment::with_prefix("marvin"))
+            .build()?;
+
+        s.try_deserialize()
+    }
+}