basic project layout and the first version of main, which handles the commandline arguments but does not do anything real, before exiting

.gitignore

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+.idea/
+*.iml
+target/

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+[[package]]
+name = "rust_lox"
+version = "0.1.0"
+

Cargo.toml

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+[package]
+name = "rust_lox"
+version = "0.1.0"
+authors = ["Sander Hautvast <shautvast@gmail.com>"]
+edition = "2018"
+
+[dependencies]

src/main.rs

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+use std::process;
+use std::env;
+
+/// main
+/// no arguments: run interactively
+/// 1 argument: run the script file specified
+fn main() {
+    let args: Vec<String> = env::args().collect();
+
+    match args.len() {
+        1 => run_prompt(),
+        2 => run_file(args.get(0).unwrap()),
+        _ => {
+            println!("Usage: lox: [script]");
+            process::exit(64);
+        }
+    }
+}
+
+fn run_file(_path: &String) {
+
+}
+
+fn run_prompt() {
+
+}