scripts: new library for common functions

1 files changed, 42 insertions, 0 deletions

diff --git a/scripts/slib b/scripts/slib
new file mode 100755
index 0000000..8eba48b
--- /dev/null
+++ b/scripts/slib
@@ -0,0 +1,42 @@
+#!/bin/sh
+
+err() {
+	[ "${1}" != "-x" ] && printf "${0}: " || shift
+
+	for line in "${@}"; do
+		echo "${line}" >&2
+	done
+	exit 1
+}
+
+invalid_use() {
+	[ "${1}" == "-h" ] && err -x "Try '${0} -h' for help."
+	err "Invalid usage" "Try '$0 -h' for help."
+}
+
+check_program() {
+	command -v "${1}" > /dev/null 2>&1 && return 0
+	[ -n "${2}" ] && err "${2}"
+	err "${1} must be installed"
+}
+
+run() {
+	relstat=0
+	if [ "${1}" = "--reload-status" ];then 
+		relstat=1
+		shift
+	fi
+
+	if ${1}; then
+		[ -n "${2}" ] && echo "${2}"
+	else
+		[ -n "${3}" ] && err "${3}"
+		exit 1 
+	fi
+
+	if [ "${relstat}" -eq 1 ]; then
+		slreload || echo "Warning: Failed to reload slstatus" >&2
+	fi
+
+	exit 0
+}