feat(rust): add configuration parsing and an error type

rust/src/main.rs

@@ -1,4 +1,8 @@
 use clap::Parser;
+use figment::{
+    Figment,
+    providers::{Env, Format, Json, Toml},
+};
 use tracing::{Level, event};
 
 mod args;
@@ -6,10 +10,19 @@ use args::{ActionType, CommandArgs};
 
 mod config;
 
+mod error;
+use error::CommandError;
+
 #[tokio::main]
-async fn main() {
+async fn main() -> Result<(), CommandError> {
     let args = CommandArgs::parse();
 
+    let config: config::CommandConfig = Figment::new()
+        .admerge(Json::file("config.json"))
+        .admerge(Toml::file("config.toml"))
+        .admerge(Env::prefixed("APP_"))
+        .extract()?;
+
     match &args.action {
         ActionType::Serve(serve_args) => {
             tracing_subscriber::fmt()
@@ -24,7 +37,11 @@ async fn main() {
 
             println!("{:#?}", args);
 
-            // println!("{:#?}", config);
+            println!("{:#?}", config);
+
+            println!("{:#?}", config.port.ports);
         }
     }
+
+    Ok(())
 }