marlin/buildroot/bin/opt_set

#!/usr/bin/env bash

# exit on first failure
set -e

SED=$(which gsed || which sed)

# Logic for returning nonzero based on answer here: https://stackoverflow.com/a/15966279/104648
eval "${SED} -i '/\(\/\/\)*\([[:blank:]]*\)\(#define \b${1}\b\).*$/{s//\2\3 ${2}/;h};\${x;/./{x;q0};x;q9}' Marlin/Configuration.h" ||
eval "${SED} -i '/\(\/\/\)*\([[:blank:]]*\)\(#define \b${1}\b\).*$/{s//\2\3 ${2}/;h};\${x;/./{x;q0};x;q9}' Marlin/Configuration_adv.h" ||
eval "echo '#define ${@}' >>Marlin/Configuration_adv.h" ||
(echo "ERROR: opt_set Can't set or add ${1}" >&2 && exit 9)