Initial import with skill sheet working

node_modules/undertaker/lib/helpers/normalizeArgs.js

@@ -0,0 +1,55 @@
+'use strict';
+
+var assert = require('assert');
+
+var levenshtein = require('fast-levenshtein');
+
+function normalizeArgs(registry, args) {
+  function getFunction(task) {
+    if (typeof task === 'function') {
+      return task;
+    }
+
+    var fn = registry.get(task);
+    if (!fn) {
+      var similar = similarTasks(registry, task);
+      var err;
+      if (similar.length > 0) {
+        err = new Error('Task never defined: ' + task + ' - did you mean? ' + similar.join(', '));
+        err.task = task;
+        err.similar = similar;
+      } else {
+        err = new Error('Task never defined: ' + task);
+        err.task = task;
+      }
+      throw err;
+    }
+    return fn;
+  }
+
+  var flattenArgs = Array.prototype.concat.apply([], args);
+  assert(flattenArgs.length, 'One or more tasks should be combined using series or parallel');
+
+  return flattenArgs.map(getFunction);
+}
+
+function similarTasks(registry, queryTask) {
+  if (typeof queryTask !== 'string') {
+    return [];
+  }
+
+  var tasks = registry.tasks();
+  var similarTasks = [];
+  for (var task in tasks) {
+    if (Object.prototype.hasOwnProperty.call(tasks, task)) {
+      var distance = levenshtein.get(task, queryTask);
+      var allowedDistance = Math.floor(0.4 * task.length) + 1;
+      if (distance < allowedDistance) {
+        similarTasks.push(task);
+      }
+    }
+  }
+  return similarTasks;
+}
+
+module.exports = normalizeArgs;