mermaid/src/logger.js

Markdownish syntax for generating flowcharts, sequence diagrams, class diagrams, gantt charts and git graphs.

/**
 * #logger
 * logger = require('logger').create()
 * logger.info("blah")
 * => [2011-3-3T20:24:4.810 info (5021)] blah
 * logger.debug("boom")
 * =>
 * logger.level = Logger.levels.debug
 * logger.debug(function() { return "booom" })
 * => [2011-3-3T20:24:4.810 error (5021)] booom
 */

function formatTime (timestamp) {
  var hh = timestamp.getUTCHours()
  var mm = timestamp.getUTCMinutes()
  var ss = timestamp.getSeconds()
  var ms = timestamp.getMilliseconds()
  // If you were building a timestamp instead of a duration, you would uncomment the following line to get 12-hour (not 24) time
  // if (hh > 12) {hh = hh % 12;}
  // These lines ensure you have two-digits
  if (hh < 10) {
    hh = '0' + hh
  }
  if (mm < 10) {
    mm = '0' + mm
  }
  if (ss < 10) {
    ss = '0' + ss
  }
  if (ms < 100) {
    ms = '0' + ms
  }
  if (ms < 10) {
    ms = '00' + ms
  }
  // This formats your string to HH:MM:SS
  var t = hh + ':' + mm + ':' + ss + ' (' + ms + ')'
  return t
}

function format (level) {
  const time = formatTime(new Date())
  return '%c ' + time + ' :%c' + level + ': '
}

var debug = function () { }
var info = function () { }
var warn = function () { }
var error = function () { }
var fatal = function () { }

/**
 * logLevel , decides the amount of logging to be used.
 *    * debug: 1
 *    * info: 2
 *    * warn: 3
 *    * error: 4
 *    * fatal: 5
 */
exports.setLogLevel = function (level) {
  if (level < 6) {
    exports.Log.fatal = console.log.bind(console, format('FATAL'), 'color:grey;', 'color: red;')
  }
  if (level < 5) {
    exports.Log.error = console.log.bind(console, format('ERROR'), 'color:grey;', 'color: red;')
  }
  if (level < 4) {
    exports.Log.warn = console.log.bind(console, format('WARN'), 'color:grey;', 'color: orange;')
  }
  if (level < 3) {
    exports.Log.info = console.log.bind(console, format('INFO'), 'color:grey;', 'color: info;')
  }
  if (level < 2) {
    exports.Log.debug = console.log.bind(console, format('DEBUG'), 'color:grey;', 'color: green;')
  }
}

exports.Log = {
  debug: debug,
  info: info,
  warn: warn,
  error: error,
  fatal: fatal
}