add REPL example and consume functions

examples/repl.rs

@@ -0,0 +1,40 @@
+extern crate rhai;
+
+use std::fmt::Display;
+use std::process::exit;
+use std::io::{stdin, stdout, Write};
+use rhai::{Engine, Scope, FnRegister};
+
+fn showit<T: Display>(x: &mut T) -> () {
+    println!("{}", x)
+}
+
+fn quit() { exit(0); }
+
+pub fn main() {
+	let mut engine = Engine::new();
+	let mut scope = Scope::new();
+
+	engine.register_fn("print", showit as fn(x: &mut i32)->());
+    engine.register_fn("print", showit as fn(x: &mut i64)->());
+    engine.register_fn("print", showit as fn(x: &mut u32)->());
+    engine.register_fn("print", showit as fn(x: &mut u64)->());
+    engine.register_fn("print", showit as fn(x: &mut f32)->());
+    engine.register_fn("print", showit as fn(x: &mut f64)->());
+    engine.register_fn("print", showit as fn(x: &mut bool)->());
+    engine.register_fn("print", showit as fn(x: &mut String)->());
+    engine.register_fn("exit", quit);
+
+	loop {
+		print!("> ");
+		let mut input = String::new();
+		stdout().flush().expect("couldn't flush stdout");
+		if let Err(e) = stdin().read_line(&mut input)  {
+			println!("input error: {}", e);
+		}
+
+		if let Err(e) = engine.consume_with_scope(&mut scope, &input) {
+			println!("error: {}", e);
+		}
+	}
+}