var EE = require('events').EventEmitter var log = exports = module.exports = new EE var util = require('util') var ansi = require('ansi') log.cursor = ansi(process.stderr) log.stream = process.stderr // by default, let ansi decide based on tty-ness. var colorEnabled = undefined log.enableColor = function () { colorEnabled = true this.cursor.enabled = true } log.disableColor = function () { colorEnabled = false this.cursor.enabled = false } // default level log.level = 'info' // temporarily stop emitting, but don't drop log.pause = function () { this._paused = true } log.resume = function () { if (!this._paused) return this._paused = false var b = this._buffer this._buffer = [] b.forEach(function (m) { this.emitLog(m) }, this) } log._buffer = [] var id = 0 log.record = [] log.maxRecordSize = 10000 log.log = function (lvl, prefix, message) { var l = this.levels[lvl] if (l === undefined) { return this.emit('error', new Error(util.format( 'Undefined log level: %j', lvl))) } var a = new Array(arguments.length - 2) var stack = null for (var i = 2; i < arguments.length; i ++) { var arg = a[i-2] = arguments[i] // resolve stack traces to a plain string. if (typeof arg === 'object' && arg && (arg instanceof Error) && arg.stack) { arg.stack = stack = arg.stack + '' } } if (stack) a.unshift(stack + '\n') message = util.format.apply(util, a) var m = { id: id++, level: lvl, prefix: String(prefix || ''), message: message, messageRaw: a } this.emit('log', m) this.emit('log.' + lvl, m) if (m.prefix) this.emit(m.prefix, m) this.record.push(m) var mrs = this.maxRecordSize var n = this.record.length - mrs if (n > mrs / 10) { var newSize = Math.floor(mrs * 0.9) this.record = this.record.slice(-1 * newSize) } this.emitLog(m) }.bind(log) log.emitLog = function (m) { if (this._paused) { this._buffer.push(m) return } var l = this.levels[m.level] if (l === undefined) return if (l < this.levels[this.level]) return if (l > 0 && !isFinite(l)) return var style = log.style[m.level] var disp = log.disp[m.level] || m.level m.message.split(/\r?\n/).forEach(function (line) { if (this.heading) { this.write(this.heading, this.headingStyle) this.write(' ') } this.write(disp, log.style[m.level]) var p = m.prefix || '' if (p) this.write(' ') this.write(p, this.prefixStyle) this.write(' ' + line + '\n') }, this) } log.write = function (msg, style) { if (!this.cursor) return if (this.stream !== this.cursor.stream) { this.cursor = ansi(this.stream, { enabled: colorEnabled }) } style = style || {} if (style.fg) this.cursor.fg[style.fg]() if (style.bg) this.cursor.bg[style.bg]() if (style.bold) this.cursor.bold() if (style.underline) this.cursor.underline() if (style.inverse) this.cursor.inverse() if (style.beep) this.cursor.beep() this.cursor.write(msg).reset() } log.addLevel = function (lvl, n, style, disp) { if (!disp) disp = lvl this.levels[lvl] = n this.style[lvl] = style if (!this[lvl]) this[lvl] = function () { var a = new Array(arguments.length + 1) a[0] = lvl for (var i = 0; i < arguments.length; i ++) { a[i + 1] = arguments[i] } return this.log.apply(this, a) }.bind(this) this.disp[lvl] = disp } log.prefixStyle = { fg: 'magenta' } log.headingStyle = { fg: 'white', bg: 'black' } log.style = {} log.levels = {} log.disp = {} log.addLevel('silly', -Infinity, { inverse: true }, 'sill') log.addLevel('verbose', 1000, { fg: 'blue', bg: 'black' }, 'verb') log.addLevel('info', 2000, { fg: 'green' }) log.addLevel('http', 3000, { fg: 'green', bg: 'black' }) log.addLevel('warn', 4000, { fg: 'black', bg: 'yellow' }, 'WARN') log.addLevel('error', 5000, { fg: 'red', bg: 'black' }, 'ERR!') log.addLevel('silent', Infinity)