Bash function file for logger.

functions_logger.sh

# functions

declare -i OK=0
declare -i FAIL=1

[ -n "$LOG_LEVEL" ] || declare -i LOG_LEVEL=3
[ -n "$DATE_FORMAT" ] || DATE_FORMAT="%x %T"
[ -n "$LOG_FILE" ] || LOG_FILE="progress.log"

logger_fatal() {
    [ "$LOG_LEVEL" -ge 0 ] || return $FAIL
    echo "[`date +"${DATE_FORMAT}"`] [FATAL] $*" 1>&2
    exit 1
}

logger_error() {
    [ "$LOG_LEVEL" -ge 1 ] || return $FAIL
    echo "[`date +"${DATE_FORMAT}"`] [ERROR] $*" 1>&2
    exit 1
}

logger_warn() {
    [ "$LOG_LEVEL" -ge 2 ] || return $FAIL
    echo "[`date +"${DATE_FORMAT}"`] [WARN] $*" 1>&2
}

logger_info() {
    [ "$LOG_LEVEL" -ge 3 ] || return $FAIL
    echo "[`date +"${DATE_FORMAT}"`] [INFO] $*" 1>&2
}

logger_debug() {
    [ "$LOG_LEVEL" -ge 4 ] || return $FAIL
    echo "[`date +"${DATE_FORMAT}"`] [DEBUG] $*" 1>&2
}

logger_trace() {
    [ "$LOG_LEVEL" -ge 5 ] || return $FAIL
    echo "[`date +"${DATE_FORMAT}"`] [TRACE] $*" 1>&2
}