| 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) |