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shrine-medco/shrine-webclient/src/main/html/node_modules/gulp-util/lib/PluginError.js
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PluginError.js
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			var util = require('util');
			var arrayDiffer = require('array-differ');
			var arrayUniq = require('array-uniq');
			var chalk = require('chalk');
			var objectAssign = require('object-assign');

			var nonEnumberableProperties = ['name', 'message', 'stack'];
			var propertiesNotToDisplay = nonEnumberableProperties.concat(['plugin', 'showStack', 'showProperties', '__safety', '_stack']);

			// wow what a clusterfuck
			var parseOptions = function(plugin, message, opt) {
			opt = opt \|\| {};
			if (typeof plugin === 'object') {
			opt = plugin;
			} else {
			if (message instanceof Error) {
			opt.error = message;
			} else if (typeof message === 'object') {
			opt = message;
			} else {
			opt.message = message;
			}
			opt.plugin = plugin;
			}

			return objectAssign({
			showStack: false,
			showProperties: true
			}, opt);
			};

			function PluginError(plugin, message, opt) {
			if (!(this instanceof PluginError)) throw new Error('Call PluginError using new');

			Error.call(this);

			var options = parseOptions(plugin, message, opt);
			var self = this;

			// if options has an error, grab details from it
			if (options.error) {
			// These properties are not enumerable, so we have to add them explicitly.
			arrayUniq(Object.keys(options.error).concat(nonEnumberableProperties))
			.forEach(function(prop) {
			self[prop] = options.error[prop];
			});
			}

			var properties = ['name', 'message', 'fileName', 'lineNumber', 'stack', 'showStack', 'showProperties', 'plugin'];

			// options object can override
			properties.forEach(function(prop) {
			if (prop in options) this[prop] = options[prop];
			}, this);

			// defaults
			if (!this.name) this.name = 'Error';

			if (!this.stack) {
			// Error.captureStackTrace appends a stack property which relies on the toString method of the object it is applied to.
			// Since we are using our own toString method which controls when to display the stack trace if we don't go through this
			// safety object, then we'll get stack overflow problems.
			var safety = {
			toString: function() {
			return this._messageWithDetails() + '\nStack:';
			}.bind(this)
			};
			Error.captureStackTrace(safety, arguments.callee \|\| this.constructor);
			this.__safety = safety;
			}

			if (!this.plugin) throw new Error('Missing plugin name');
			if (!this.message) throw new Error('Missing error message');
			}

			util.inherits(PluginError, Error);

			PluginError.prototype._messageWithDetails = function() {
			var messageWithDetails = 'Message:\n ' + this.message;
			var details = this._messageDetails();

			if (details !== '') {
			messageWithDetails += '\n' + details;
			}

			return messageWithDetails;
			};

			PluginError.prototype._messageDetails = function() {
			if (!this.showProperties) {
			return '';
			}

			var properties = arrayDiffer(Object.keys(this), propertiesNotToDisplay);

			if (properties.length === 0) {
			return '';
			}

			var self = this;
			properties = properties.map(function stringifyProperty(prop) {
			return ' ' + prop + ': ' + self[prop];
			});

			return 'Details:\n' + properties.join('\n');
			};

			PluginError.prototype.toString = function () {
			var sig = chalk.red(this.name) + ' in plugin \'' + chalk.cyan(this.plugin) + '\'';
			var detailsWithStack = function(stack) {
			return this._messageWithDetails() + '\nStack:\n' + stack;
			}.bind(this);

			var msg;
			if (this.showStack) {
			if (this.__safety) { // There is no wrapped error, use the stack captured in the PluginError ctor
			msg = this.__safety.stack;
			} else if (this._stack) {
			msg = detailsWithStack(this._stack);
			} else { // Stack from wrapped error
			msg = detailsWithStack(this.stack);
			}
			} else {
			msg = this._messageWithDetails();
			}

			return sig + '\n' + msg;
			};

			module.exports = PluginError;