feat: cli reports errors

README.md

@@ -48,7 +48,7 @@ For the language to be almost operational it should have:
   - return
   - recursion
 - [x] comments
-- [ ] stdin, stdout
+- [x] stdin, stdout
 - [x] imports
 - [x] error reporting with line numbers
 

src/main.rs

@@ -1,4 +1,4 @@
-use std::{fs, path::PathBuf};
+use std::{fs, path::PathBuf, process::exit};
 
 use clap::Parser;
 
@@ -17,10 +17,31 @@ fn main() {
 fn run(path: PathBuf) {
     let input = match fs::read_to_string(path) {
         Ok(input) => input,
-        Err(err) => panic!("Failed to read input file: {err}"),
+        Err(err) => {
+            println!("Failed to read input file: {err}");
+            exit(1);
+        }
     };
 
-    // TODO: Better error handling
-    let program = parser::parse(&input).unwrap();
-    runtime::run(&program).unwrap();
+    let program = match parser::parse(&input) {
+        Ok(program) => program,
+        Err(err) => {
+            println!(
+                "Syntax error on line {}, character {}:\n  {}",
+                err.range.start.line, err.range.start.character, err
+            );
+            exit(1);
+        }
+    };
+
+    match runtime::run(&program) {
+        Ok(_) => (),
+        Err(err) => {
+            println!(
+                "Runtime error on line {}, character {}:\n  {}",
+                err.range.start.line, err.range.start.character, err
+            );
+            exit(1);
+        }
+    }
 }