From 192f077c62b1659be1adbcfeee8b88ebed9f964f Mon Sep 17 00:00:00 2001
From: Ivan Gromov <m@ivangromov.me>
Date: Tue, 3 Oct 2023 21:13:41 +0100
Subject: [PATCH] print errors in interactive mode

---
 src/interpreter.rs | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/src/interpreter.rs b/src/interpreter.rs
index f673140..2dc8060 100644
--- a/src/interpreter.rs
+++ b/src/interpreter.rs
@@ -11,6 +11,7 @@ use crate::ast::expr::ExprType;
 use crate::ast::expr::UnaryOp;
 use crate::ast::visitor::StatementVisitor;
 use crate::ast::{Expr, Visitor};
+use crate::error;
 use crate::error::LoxError;
 use crate::error::LoxErrorKind;
 use crate::position::PositionRange;
@@ -210,7 +211,6 @@ impl StatementVisitor for Interpreter<'_> {
             }
             ast::Statement::Print { expr, position: _ } => {
                 let value = self.visit_expr(expr)?;
-                println!("{}", value);
                 writeln!(self.stdout, "{}", value);
             }
             ast::Statement::Var {
@@ -270,7 +270,15 @@ pub fn run_prompt() -> Result<(), Box<dyn Error>> {
         if r == 0 {
             return Ok(());
         }
-        run(&buffer);
+        let result = run(&buffer);
+        match result {
+            Err(errors) => {
+                for error in errors {
+                    println!("Error at ({}, {}): {}", error.position.start.line, error.position.start.column, error.message);
+                }
+            }
+            _ => (),
+        }
     }
 }