SOURCE_FILE=$_
 
set -ueEo pipefail
 
function log() {
    echo -e "\033[0;33m[INFO] $@\033[0m"
    echo "[INFO]  $@" >> $(dirname "${BASH_SOURCE[0]}")/test.log
}
 
# lineno[, msg]
function die() {
    local line=$1
    local msg=${2:-command failed}
    local supplemental=${3:-}
    echo "[ERROR] $SOURCE_FILE:$1 $msg" | tee -a $(dirname "${BASH_SOURCE[0]}")/test.log | cat 1>&2
    if [ ! -z "$supplemental" ]; then
        echo "$supplemental" | >&2 sed 's|^|        |g'
    fi
    exit 1
}
trap 'die $LINENO' ERR