1 files changed, 34 insertions, 0 deletions
diff --git a/bin/sit b/bin/sit
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index 0000000..eab8955
--- /dev/null
+++ b/bin/sit
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+#!/usr/bin/env sh
+
+# a simple beep implementation for the "Hinweiston nach 1 TR 110-1, Kap. 8.8", also called "Sonderinformationston" or - shorthand - SIT.
+
+function zuhuelf {
+	printf "USAGE: %b [ -l ]\\n\\n" "$(basename "$0")"
+	printf "DESCRIPTION: Hinweiston nach 1 TR 110-1, Kap. 8.8 / SonderInformationsTon\\n\\n"
+	(
+		printf -- "-h:;This help\\n"
+		printf -- "-l:;Loop the tone. Delays between loops are also implemented according to\\n"
+		printf " ;1 TR 110-1 Kap. 8.8.\\n"
+	)|column -ts\;
+	printf "\\n"
+}
+
+LOOPADOOP=0
+while getopts :hl SHOPT;do
+	case "$SHOPT" in
+		"h") zuhuelf;exit 0;;
+		"l") LOOPADOOP=1;;
+	esac
+done
+
+function sittone {
+	# chain the tones to avoid kernel delays between tones
+	beep -l 330 -f 950 -n -l 330 -f 1400 -n -l 330 -f 1800
+}
+
+if [ "$LOOPADOOP" -eq 1 ];then
+	# TR 110-1 specifies a delay of 1000ms between repetitions
+	while true; do sittone; sleep 1; done
+else
+	sittone
+fi