1 files changed, 5 insertions, 1 deletions
diff --git a/main.ha b/main.ha
index e1c9e74..c8e5c65 100644
--- a/main.ha
+++ b/main.ha
@@ -1,4 +1,5 @@
 use fmt;
+use os;
 use strings;
 
 let bf: Brainfuck = Brainfuck {
@@ -7,8 +8,11 @@ let bf: Brainfuck = Brainfuck {
 };
 
 export fn main() void = {
-	const buf = drain_stdin();
+	if (len(os::args) != 2)
+		fmt::fatal("usage: hare-brainfuck <source>");
+	const buf = drain(os::args[1]);
 	defer free(buf);
 	const buf = optimize(buf);
+	fmt::println("optimized source", strings::fromutf8(buf)!)!;
 	exec(&bf, buf);
 };