io: Add wrapper to swallow startup message from Io interpreter

[jackhill/mal.git] / io / run

diff --git a/io/run b/io/run
new file mode 100755 (executable)
index 0000000..a7ad284
--- /dev/null
+++ b/io/run
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+# Io prints the line "Registering Regex: Regex" when loading the Regex module
+# for the first time, and there's no way to suppress it.  To avoid this from
+# polluting the Mal script output, we swallow the first 25 bytes.
+io $(dirname $0)/${STEP:-stepA_mal}.io "$@" | (read -N 25 -t 10 ; cat)