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+
+/**
+ * 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[9' + c + 'm' + 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());