Bash Logger

logger.sh

#!/bin/bash
[[ -n "${__LOGGER_SH:-}" ]] && return || readonly __LOGGER_SH=1

# Usage:
#   source ./logger.sh
#   log_info "message"

# 0: DEBUG
# 1: INFO
# 2: WARN
# 3: ERROR
declare LOG_LEVEL=${LOG_LEVEL:-1}

log_debug() {
	if (( $LOG_LEVEL <= 0 )); then
		echo -e "\033[1;40m DEBUG \033[00m $*" 1>&2
	fi
}

log_info() {
	if (( $LOG_LEVEL <= 1 )); then
		echo -e "\033[1;44m INFO \033[00m $*" 1>&2
	fi
}

log_warn() {
	if (( $LOG_LEVEL <= 2 )); then
		echo -e "\033[1;43m WARN \033[00m $*" 1>&2
	fi
}

log_error() {
	if (( $LOG_LEVEL <= 3 )); then
		echo -e "\033[1;41m ERROR \033[00m $*" 1>&2
	fi
}