1
  2/**
  3 * Module dependencies.
  4 */
  5
  6var tty = require('tty');
  7var util = require('util');
  8
  9/**
 10 * This is the Node.js implementation of `debug()`.
 11 *
 12 * Expose `debug()` as the module.
 13 */
 14
 15exports = module.exports = require('./debug');
 16exports.log = log;
 17exports.formatArgs = formatArgs;
 18exports.save = save;
 19exports.load = load;
 20exports.useColors = useColors;
 21
 22/**
 23 * Colors.
 24 */
 25
 26exports.colors = [6, 2, 3, 4, 5, 1];
 27
 28/**
 29 * Is stdout a TTY? Colored output is enabled when `true`.
 30 */
 31
 32function useColors() {
 33  var debugColors = (process.env.DEBUG_COLORS || '').trim().toLowerCase();
 34  if (0 === debugColors.length) {
 35    return tty.isatty(1);
 36  } else {
 37    return '0' !== debugColors
 38        && 'no' !== debugColors
 39        && 'false' !== debugColors
 40        && 'disabled' !== debugColors;
 41  }
 42}
 43
 44/**
 45 * Map %o to `util.inspect()`, since Node doesn't do that out of the box.
 46 */
 47
 48var inspect = (4 === util.inspect.length ?
 49  // node <= 0.8.x
 50  function (v, colors) {
 51    return util.inspect(v, void 0, void 0, colors);
 52  } :
 53  // node > 0.8.x
 54  function (v, colors) {
 55    return util.inspect(v, { colors: colors });
 56  }
 57);
 58
 59exports.formatters.o = function(v) {
 60  return inspect(v, this.useColors)
 61    .replace(/\s*\n\s*/g, ' ');
 62};
 63
 64/**
 65 * Adds ANSI color escape codes if enabled.
 66 *
 67 * @api public
 68 */
 69
 70function formatArgs() {
 71  var args = arguments;
 72  var useColors = this.useColors;
 73  var name = this.namespace;
 74
 75  if (useColors) {
 76    var c = this.color;
 77
 78    args[0] = '  \u001b[9' + c + 'm' + name + ' '
 79      + '\u001b[0m'
 80      + args[0] + '\u001b[3' + c + 'm'
 81      + ' +' + exports.humanize(this.diff) + '\u001b[0m';
 82  } else {
 83    args[0] = new Date().toUTCString()
 84      + ' ' + name + ' ' + args[0];
 85  }
 86  return args;
 87}
 88
 89/**
 90 * Invokes `console.log()` with the specified arguments.
 91 */
 92
 93function log() {
 94  return console.log.apply(console, arguments);
 95}
 96
 97/**
 98 * Save `namespaces`.
 99 *
100 * @param {String} namespaces
101 * @api private
102 */
103
104function save(namespaces) {
105  if (null == namespaces) {
106    // If you set a process.env field to null or undefined, it gets cast to the
107    // string 'null' or 'undefined'. Just delete instead.
108    delete process.env.DEBUG;
109  } else {
110    process.env.DEBUG = namespaces;
111  }
112}
113
114/**
115 * Load `namespaces`.
116 *
117 * @return {String} returns the previously persisted debug modes
118 * @api private
119 */
120
121function load() {
122  return process.env.DEBUG;
123}
124
125/**
126 * Enable namespaces listed in `process.env.DEBUG` initially.
127 */
128
129exports.enable(load());