Restructure to library / binary combo

src/bin/ijvm.rs

@@ -0,0 +1,30 @@
+extern crate rustijvm;
+
+use rustijvm::machine::Machine;
+use std::env;
+
+
+fn main() {
+    let args: Vec<String> = env::args().collect();
+
+    if args.len() < 2 {
+        println!("Usage: {} ijvmfile", args[0]);
+        return;
+    }
+
+    let ijvmfile = &args[1];
+
+    let mut machine = Machine::new_from_file(ijvmfile).unwrap();
+    while machine.has_step() {
+        match machine.step() {
+            Ok(_) => (),
+            Err(str) => {
+                println!("\n\nERROR: pc=0x{:x} fp=0x{:x}: {}\nProgram exit",
+                         machine.get_program_counter(),
+                         machine.frame.len() - 1,
+                         str);
+                return;
+            }
+        }
+    }
+}