rewrite: readability

src/commands/eval.rs

@@ -1,27 +1,17 @@
 use crate::common::{self, Context, Error};
 use std::io::Cursor;
 
-/// Evaluates a Lamm program
+/// Evaluate a program written in the Lamm programming language
 #[poise::command(prefix_command, aliases("lamm"))]
 pub async fn eval(ctx: Context<'_>, expr: poise::CodeBlock) -> Result<(), Error> {
 	let runtime = lamm::Runtime::new(Cursor::new(expr.code), "<eval>");
 
-	let values = runtime.values().fold(Ok(String::new()), |acc, v| {
-		if acc.is_err() {
-			return acc;
-		};
-
-		let x = acc.unwrap();
-
-		match v {
-			Ok(lamm::Value::Nil) => Ok(x),
-			Ok(v) => Ok(format!("{x}\n{v}")),
-			Err(e) => Err(e),
-		}
-	});
+	let values = runtime.values()
+		.map(|res| res.map(|value| value.to_string()))
+		.collect::<Result<Vec<_>, _>>();
 
 	match values {
-		Ok(values) => common::no_ping_reply(&ctx, format!("{values}")).await?,
+		Ok(values) => common::no_ping_reply(&ctx, format!("{}", values.join("\n"))).await?,
 		Err(e) => common::no_ping_reply(&ctx, format!("```ansi\n\x1b[31;1merror\x1b[0m: {e}\n```")).await?,
 	};