node.js

/**
 * Module dependencies.
 */

var tty = require('tty');
var util = require('util');

/**
 * This is the Node.js implementation of `debug()`.
 *
 * Expose `debug()` as the module.
 */

exports = module.exports = require('./debug');
exports.log = log;
exports.formatArgs = formatArgs;
exports.save = save;
exports.load = load;
exports.useColors = useColors;

/**
 * Colors.
 */

exports.colors = [6, 2, 3, 4, 5, 1];

/**
 * The file descriptor to write the `debug()` calls to.
 * Set the `DEBUG_FD` env variable to override with another value. i.e.:
 *
 *   $ DEBUG_FD=3 node script.js 3>debug.log
 */

var fd = parseInt(process.env.DEBUG_FD, 10) || 2;
var stream = 1 === fd ? process.stdout :
             2 === fd ? process.stderr :
             createWritableStdioStream(fd);

/**
 * Is stdout a TTY? Colored output is enabled when `true`.
 */

function useColors() {
  var debugColors = (process.env.DEBUG_COLORS || '').trim().toLowerCase();
  if (0 === debugColors.length) {
    return tty.isatty(fd);
  } else {
    return '0' !== debugColors
        && 'no' !== debugColors
        && 'false' !== debugColors
        && 'disabled' !== debugColors;
  }
}

/**
 * Map %o to `util.inspect()`, since Node doesn't do that out of the box.
 */

var inspect = (4 === util.inspect.length ?
  // node <= 0.8.x
  function (v, colors) {
    return util.inspect(v, void 0, void 0, colors);
  } :
  // node > 0.8.x
  function (v, colors) {
    return util.inspect(v, { colors: colors });
  }
);

exports.formatters.o = function(v) {
  return inspect(v, this.useColors)
    .replace(/\s*\n\s*/g, ' ');
};

/**
 * Adds ANSI color escape codes if enabled.
 *
 * @api public
 */

function formatArgs() {
  var args = arguments;
  var useColors = this.useColors;
  var name = this.namespace;

  if (useColors) {
    var c = this.color;

    args[0] = '  \u001b[3' + c + ';1m' + name + ' '
      + '\u001b[0m'
      + args[0] + '\u001b[3' + c + 'm'
      + ' +' + exports.humanize(this.diff) + '\u001b[0m';
  } else {
    args[0] = new Date().toUTCString()
      + ' ' + name + ' ' + args[0];
  }
  return args;
}

/**
 * Invokes `console.error()` with the specified arguments.
 */

function log() {
  return stream.write(util.format.apply(this, arguments) + '\n');
}

/**
 * Save `namespaces`.
 *
 * @param {String} namespaces
 * @api private
 */

function save(namespaces) {
  if (null == namespaces) {
    // If you set a process.env field to null or undefined, it gets cast to the
    // string 'null' or 'undefined'. Just delete instead.
    delete process.env.DEBUG;
  } else {
    process.env.DEBUG = namespaces;
  }
}

/**
 * Load `namespaces`.
 *
 * @return {String} returns the previously persisted debug modes
 * @api private
 */

function load() {
  return process.env.DEBUG;
}

/**
 * Copied from `node/src/node.js`.
 *
 * XXX: It's lame that node doesn't expose this API out-of-the-box. It also
 * relies on the undocumented `tty_wrap.guessHandleType()` which is also lame.
 */

function createWritableStdioStream (fd) {
  var stream;
  var tty_wrap = process.binding('tty_wrap');

  // Note stream._type is used for test-module-load-list.js

  switch (tty_wrap.guessHandleType(fd)) {
    case 'TTY':
      stream = new tty.WriteStream(fd);
      stream._type = 'tty';

      // Hack to have stream not keep the event loop alive.
      // See https://github.com/joyent/node/issues/1726
      if (stream._handle && stream._handle.unref) {
        stream._handle.unref();
      }
      break;

    case 'FILE':
      var fs = require('fs');
      stream = new fs.SyncWriteStream(fd, { autoClose: false });
      stream._type = 'fs';
      break;

    case 'PIPE':
    case 'TCP':
      var net = require('net');
      stream = new net.Socket({
        fd: fd,
        readable: false,
        writable: true
      });

      // FIXME Should probably have an option in net.Socket to create a
      // stream from an existing fd which is writable only. But for now
      // we'll just add this hack and set the `readable` member to false.
      // Test: ./node test/fixtures/echo.js < /etc/passwd
      stream.readable = false;
      stream.read = null;
      stream._type = 'pipe';

      // FIXME Hack to have stream not keep the event loop alive.
      // See https://github.com/joyent/node/issues/1726
      if (stream._handle && stream._handle.unref) {
        stream._handle.unref();
      }
      break;

    default:
      // Probably an error on in uv_guess_handle()
      throw new Error('Implement me. Unknown stream file type!');
  }

  // For supporting legacy API we put the FD here.
  stream.fd = fd;

  stream._isStdio = true;

  return stream;
}

/**
 * Enable namespaces listed in `process.env.DEBUG` initially.
 */

exports.enable(load());