Initial commit

src/main.rs

@@ -0,0 +1,47 @@
+use std::env;
+use std::fs;
+use std::io;
+use std::io::Write;
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+
+    match args.len() {
+        1 => run_prompt(),
+        2 => run_file(&args[1]),
+        _ => {
+            println!("Usage : rlox [script]");
+        }
+    }
+}
+
+fn run_file( file_path: &str ) {
+    let contents = fs::read_to_string(file_path)
+        .expect(&format!("Should have been able to read the file {file_path}"));
+
+    run(contents);
+}
+
+fn run_prompt() {
+    loop {
+        print!("> ");
+        io::stdout().flush().expect("Unable to flush stdout");
+        let mut line = String::new();
+
+        io::stdin()
+            .read_line(&mut line)
+            .expect("Failed to read line");
+
+        if line.trim().is_empty() {
+            break;
+        }
+
+        run(line);
+    }
+}
+
+fn run( _script: String ) {
+
+}
+
+// http://www.craftinginterpreters.com/scanning.html#error-handling