niceties

niceties/battery

@@ -0,0 +1,19 @@
+#!/bin/sh
+
+subprogram="$(command -v "$0")"
+if ! str isvalue "$subprogram" && ! test -e "$0"; then
+	printf "%s: can't find myself!\n" "$0"
+	exit 70 # sysexits(3) EX_SOFTWARE
+else
+	subprogram="$0"
+fi
+
+# battery -> battery.linux battery.netbsd etc
+subprogram="$0"."$(uname | lowercase)"
+
+if ! command -v "$subprogram" >/dev/null 2>&1 && ! test -e "$subprogram"; then
+	printf "%s: unsupported system\n" "$(uname)" 1>&2
+	exit 70 # sysexits(3) EX_SOFTWARE
+fi
+
+"$subprogram" || exit 70 # sysexits(3) EX_SOFTWARE