Start with SchematicsFactory and bin

src/bin.rs

@@ -0,0 +1,13 @@
+use std::process::exit;
+use std::env;
+
+pub fn schematics_main(run: &Fn (bool) -> Result<(), ()>) {
+  let args: Vec<String> = env::args().collect();
+  let dry_run = match args.len() {
+    1 => false,
+    2 => if args[1] == "--dry-run" { true } else { panic!() },
+    _ => panic!()
+  };
+
+  exit(match run(dry_run) { Ok(_) => 0, Err(_) => 1 });
+}