# ===== Log =====
# log.info xxx
# log.warn xxx
# log.info xxx
# log.debug xxx
# 带颜色的echo
function log.color_output() {
    local color=$1
    shift 1

    echo >&2 -e "\033[${color}m$@\033[0m"
    return 0
}

# Log is named without prefix "utils." for convenience
# Usage: log.log <level> ...content
function log.log() {
    if [[ $# < 2 ]]; then
        return -1
    fi

    local level=$1
    shift 1

    case $level in
    error) log.color_output "0;31" "[ERROR] $@" ;;
    warn) log.color_output "1;33" "[WARN] $@" ;;
    info) log.color_output "1;37" "[INFO] $@" ;;
    debug) log.color_output "1;30" "[DEBUG] $@" ;;
    esac

    return 0
}

function log.error() { log.log "error" "$@"; }
function log.warn() { log.log "warn" $@; }
function log.info() { log.log "info" $@; }
function log.debug() { log.log "debug" $@; }