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npmlog
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Filename :
log.js
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'use strict' var Progress = require('are-we-there-yet') var Gauge = require('gauge') var EE = require('events').EventEmitter var log = exports = module.exports = new EE() var util = require('util') var setBlocking = require('set-blocking') var consoleControl = require('console-control-strings') setBlocking(true) var stream = process.stderr Object.defineProperty(log, 'stream', { set: function (newStream) { stream = newStream if (this.gauge) this.gauge.setWriteTo(stream, stream) }, get: function () { return stream } }) // by default, decide based on tty-ness. var colorEnabled log.useColor = function () { return colorEnabled != null ? colorEnabled : stream.isTTY } log.enableColor = function () { colorEnabled = true this.gauge.setTheme({hasColor: colorEnabled, hasUnicode: unicodeEnabled}) } log.disableColor = function () { colorEnabled = false this.gauge.setTheme({hasColor: colorEnabled, hasUnicode: unicodeEnabled}) } // default level log.level = 'info' log.gauge = new Gauge(stream, { theme: {hasColor: log.useColor()}, template: [ {type: 'progressbar', length: 20}, {type: 'activityIndicator', kerning: 1, length: 1}, {type: 'section', default: ''}, ':', {type: 'logline', kerning: 1, default: ''} ] }) log.tracker = new Progress.TrackerGroup() // no progress bars unless asked log.progressEnabled = false var unicodeEnabled log.enableUnicode = function () { unicodeEnabled = true this.gauge.setTheme({hasColor: this.useColor(), hasUnicode: unicodeEnabled}) } log.disableUnicode = function () { unicodeEnabled = false this.gauge.setTheme({hasColor: this.useColor(), hasUnicode: unicodeEnabled}) } log.setGaugeThemeset = function (themes) { this.gauge.setThemeset(themes) } log.setGaugeTemplate = function (template) { this.gauge.setTemplate(template) } log.enableProgress = function () { if (this.progressEnabled) return this.progressEnabled = true if (this._pause) return this.tracker.on('change', this.showProgress) this.gauge.enable() this.showProgress() } log.disableProgress = function () { if (!this.progressEnabled) return this.clearProgress() this.progressEnabled = false this.tracker.removeListener('change', this.showProgress) this.gauge.disable() } var trackerConstructors = ['newGroup', 'newItem', 'newStream'] var mixinLog = function (tracker) { // mixin the public methods from log into the tracker // (except: conflicts and one's we handle specially) Object.keys(log).forEach(function (P) { if (P[0] === '_') return if (trackerConstructors.filter(function (C) { return C === P }).length) return if (tracker[P]) return if (typeof log[P] !== 'function') return var func = log[P] tracker[P] = function () { return func.apply(log, arguments) } }) // if the new tracker is a group, make sure any subtrackers get // mixed in too if (tracker instanceof Progress.TrackerGroup) { trackerConstructors.forEach(function (C) { var func = tracker[C] tracker[C] = function () { return mixinLog(func.apply(tracker, arguments)) } }) } return tracker } // Add tracker constructors to the top level log object trackerConstructors.forEach(function (C) { log[C] = function () { return mixinLog(this.tracker[C].apply(this.tracker, arguments)) } }) log.clearProgress = function (cb) { if (!this.progressEnabled) return cb && process.nextTick(cb) this.gauge.hide(cb) } log.showProgress = function (name, completed) { if (!this.progressEnabled) return var values = {} if (name) values.section = name var last = log.record[log.record.length - 1] if (last) { values.subsection = last.prefix var disp = log.disp[last.level] || last.level var logline = this._format(disp, log.style[last.level]) if (last.prefix) logline += ' ' + this._format(last.prefix, this.prefixStyle) logline += ' ' + last.message.split(/\r?\n/)[0] values.logline = logline } values.completed = completed || this.tracker.completed() this.gauge.show(values) }.bind(log) // bind for use in tracker's on-change listener // 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) if (this.progressEnabled) this.enableProgress() } 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 } if (this.progressEnabled) this.gauge.pulse(m.prefix) var l = this.levels[m.level] if (l === undefined) return if (l < this.levels[this.level]) return if (l > 0 && !isFinite(l)) return // If 'disp' is null or undefined, use the lvl as a default // Allows: '', 0 as valid disp var disp = log.disp[m.level] != null ? log.disp[m.level] : m.level this.clearProgress() 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) this.showProgress() } log._format = function (msg, style) { if (!stream) return var output = '' if (this.useColor()) { style = style || {} var settings = [] if (style.fg) settings.push(style.fg) if (style.bg) settings.push('bg' + style.bg[0].toUpperCase() + style.bg.slice(1)) if (style.bold) settings.push('bold') if (style.underline) settings.push('underline') if (style.inverse) settings.push('inverse') if (settings.length) output += consoleControl.color(settings) if (style.beep) output += consoleControl.beep() } output += msg if (this.useColor()) { output += consoleControl.color('reset') } return output } log.write = function (msg, style) { if (!stream) return stream.write(this._format(msg, style)) } log.addLevel = function (lvl, n, style, disp) { // If 'disp' is null or undefined, use the lvl as a default if (disp == null) 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) // allow 'error' prefix log.on('error', function () {})