feat: configuration handling across multiple files

- add `debug` trait to `config` struct in `config.rs`
- implement `config` function in `ext.rs` that loads and prints a configuration
- add `config` command variant to the `cmd` enum in `main.rs`

src/config.rs

@@ -79,7 +79,7 @@ mod de {
     }
 }
 
-#[derive(Serialize, Deserialize)]
+#[derive(Serialize, Deserialize, Debug)]
 #[serde(deny_unknown_fields)]
 pub struct Config {
     #[serde(default = "default::instance_timeout")]

src/ext.rs

@@ -70,6 +70,12 @@ where
     }
 }
 
+pub async fn config() -> Result<()> {
+    let config = Config::load_or_default().await;
+    println!("{:?}", config);
+    Ok(())
+}
+
 pub async fn status(json: bool) -> Result<()> {
     let res = ext_request::<StatusResponse>(ext::Request::Status {}).await?;
 

src/main.rs

@@ -38,6 +38,9 @@ enum Cmd {
         json: bool,
     },
 
+    /// Print server configuration
+    Config {},
+
     /// Reload workspace
     ///
     /// For rust-analyzer send the `rust-analyzer/reloadWorkspace` extension request.
@@ -56,6 +59,7 @@ async fn main() -> anyhow::Result<()> {
             server_args,
         }) => proxy::run(server_path, server_args).await,
         Some(Cmd::Status { json }) => ext::status(json).await,
+        Some(Cmd::Config {}) => ext::config().await,
         Some(Cmd::Reload {}) => ext::reload().await,
         None => {
             let server_path = env::var("RA_MUX_SERVER").unwrap_or_else(|_| "rust-analyzer".into());