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node_modules/sequencify/index.js

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+/*jshint node:true */
+
+"use strict";
+
+var sequence = function (tasks, names, results, nest) {
+	var i, name, node, e, j;
+	nest = nest || [];
+	for (i = 0; i < names.length; i++) {
+		name = names[i];
+		// de-dup results
+		if (results.indexOf(name) === -1) {
+			node = tasks[name];
+			if (!node) {
+				e = new Error('task "'+name+'" is not defined');
+				e.missingTask = name;
+				e.taskList = [];
+				for (j in tasks) {
+					if (tasks.hasOwnProperty(j)) {
+						e.taskList.push(tasks[j].name);
+					}
+				}
+				throw e;
+			}
+			if (nest.indexOf(name) > -1) {
+				nest.push(name);
+				e = new Error('Recursive dependencies detected: '+nest.join(' -> '));
+				e.recursiveTasks = nest;
+				e.taskList = [];
+				for (j in tasks) {
+					if (tasks.hasOwnProperty(j)) {
+						e.taskList.push(tasks[j].name);
+					}
+				}
+				throw e;
+			}
+			if (node.dep.length) {
+				nest.push(name);
+				sequence(tasks, node.dep, results, nest); // recurse
+				nest.pop(name);
+			}
+			results.push(name);
+		}
+	}
+};
+
+module.exports = sequence;