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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.init = init;
+exports.log = log;
+exports.formatArgs = formatArgs;
+exports.save = save;
+exports.load = load;
+exports.useColors = useColors;
+
+/**
+ * Colors.
+ */
+
+exports.colors = [ 6, 2, 3, 4, 5, 1 ];
+
+try {
+ var supportsColor = require('supports-color');
+ if (supportsColor && supportsColor.level >= 2) {
+ exports.colors = [
+ 20, 21, 26, 27, 32, 33, 38, 39, 40, 41, 42, 43, 44, 45, 56, 57, 62, 63, 68,
+ 69, 74, 75, 76, 77, 78, 79, 80, 81, 92, 93, 98, 99, 112, 113, 128, 129, 134,
+ 135, 148, 149, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169, 170, 171,
+ 172, 173, 178, 179, 184, 185, 196, 197, 198, 199, 200, 201, 202, 203, 204,
+ 205, 206, 207, 208, 209, 214, 215, 220, 221
+ ];
+ }
+} catch (err) {
+ // swallow - we only care if `supports-color` is available; it doesn't have to be.
+}
+
+/**
+ * Build up the default `inspectOpts` object from the environment variables.
+ *
+ * $ DEBUG_COLORS=no DEBUG_DEPTH=10 DEBUG_SHOW_HIDDEN=enabled node script.js
+ */
+
+exports.inspectOpts = Object.keys(process.env).filter(function (key) {
+ return /^debug_/i.test(key);
+}).reduce(function (obj, key) {
+ // camel-case
+ var prop = key
+ .substring(6)
+ .toLowerCase()
+ .replace(/_([a-z])/g, function (_, k) { return k.toUpperCase() });
+
+ // coerce string value into JS value
+ var val = process.env[key];
+ if (/^(yes|on|true|enabled)$/i.test(val)) val = true;
+ else if (/^(no|off|false|disabled)$/i.test(val)) val = false;
+ else if (val === 'null') val = null;
+ else val = Number(val);
+
+ obj[prop] = val;
+ return obj;
+}, {});
+
+/**
+ * Is stdout a TTY? Colored output is enabled when `true`.
+ */
+
+function useColors() {
+ return 'colors' in exports.inspectOpts
+ ? Boolean(exports.inspectOpts.colors)
+ : tty.isatty(process.stderr.fd);
+}
+
+/**
+ * Map %o to `util.inspect()`, all on a single line.
+ */
+
+exports.formatters.o = function(v) {
+ this.inspectOpts.colors = this.useColors;
+ return util.inspect(v, this.inspectOpts)
+ .split('\n').map(function(str) {
+ return str.trim()
+ }).join(' ');
+};
+
+/**
+ * Map %o to `util.inspect()`, allowing multiple lines if needed.
+ */
+
+exports.formatters.O = function(v) {
+ this.inspectOpts.colors = this.useColors;
+ return util.inspect(v, this.inspectOpts);
+};
+
+/**
+ * Adds ANSI color escape codes if enabled.
+ *
+ * @api public
+ */
+
+function formatArgs(args) {
+ var name = this.namespace;
+ var useColors = this.useColors;
+
+ if (useColors) {
+ var c = this.color;
+ var colorCode = '\u001b[3' + (c < 8 ? c : '8;5;' + c);
+ var prefix = ' ' + colorCode + ';1m' + name + ' ' + '\u001b[0m';
+
+ args[0] = prefix + args[0].split('\n').join('\n' + prefix);
+ args.push(colorCode + 'm+' + exports.humanize(this.diff) + '\u001b[0m');
+ } else {
+ args[0] = getDate() + name + ' ' + args[0];
+ }
+}
+
+function getDate() {
+ if (exports.inspectOpts.hideDate) {
+ return '';
+ } else {
+ return new Date().toISOString() + ' ';
+ }
+}
+
+/**
+ * Invokes `util.format()` with the specified arguments and writes to stderr.
+ */
+
+function log() {
+ return process.stderr.write(util.format.apply(util, 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;
+}
+
+/**
+ * Init logic for `debug` instances.
+ *
+ * Create a new `inspectOpts` object in case `useColors` is set
+ * differently for a particular `debug` instance.
+ */
+
+function init (debug) {
+ debug.inspectOpts = {};
+
+ var keys = Object.keys(exports.inspectOpts);
+ for (var i = 0; i < keys.length; i++) {
+ debug.inspectOpts[keys[i]] = exports.inspectOpts[keys[i]];
+ }
+}
+
+/**
+ * Enable namespaces listed in `process.env.DEBUG` initially.
+ */
+
+exports.enable(load());