feat: usable?

src/bin/repl.rs

@@ -0,0 +1,34 @@
+use rustyline::error::ReadlineError;
+use rustyline::{DefaultEditor, Result};
+
+use nixjit::*;
+
+fn main() -> Result<()> {
+    let mut rl = DefaultEditor::new()?;
+    loop {
+        let readline = rl.readline(">> ");
+        match readline {
+            Ok(expr) => {
+                if expr.trim().is_empty() {
+                    continue;
+                }
+                let prog = compile(expr.as_str()).unwrap();
+                println!("{}", run(prog).unwrap());
+                rl.add_history_entry(expr.as_str())?;
+            }
+            Err(ReadlineError::Interrupted) => {
+                println!("CTRL-C");
+                break;
+            }
+            Err(ReadlineError::Eof) => {
+                println!("CTRL-D");
+                break;
+            }
+            Err(err) => {
+                println!("Error: {:?}", err);
+                break;
+            }
+        }
+    }
+    Ok(())
+}