luci-base: luci.js: add array sort utilities

Add two new utility functions L.naturalCompare() and L.sortedArray() to
simplify sorting arrays naturally.

Ref: #5899
Signed-off-by: Jo-Philipp Wich <jo@mein.io>

modules/luci-base/htdocs/luci-static/resources/luci.js

@@ -2220,6 +2220,8 @@
 		view: View
 	};
 
+	var naturalCompare = new Intl.Collator(undefined, { numeric: true }).compare;
+
 	var LuCI = Class.extend(/** @lends LuCI.prototype */ {
 		__name__: 'LuCI',
 		__init__: function(setenv) {
@@ -2965,17 +2967,54 @@
 			}).filter(function(e) {
 				return (e[1] != null);
 			}).sort(function(a, b) {
-				if (a[1] < b[1])
-					return -1;
-				else if (a[1] > b[1])
-					return 1;
-				else
-					return 0;
+				return naturalCompare(a[1], b[1]);
 			}).map(function(e) {
 				return e[0];
 			});
 		},
 
+		/**
+		 * Compares two values numerically and returns -1, 0 or 1 depending
+		 * on whether the first value is smaller, equal to or larger than the
+		 * second one respectively.
+		 *
+		 * This function is meant to be used as comparator function for
+		 * Array.sort().
+		 *
+		 * @type {function}
+		 *
+		 * @param {*} a
+		 * The first value
+		 *
+		 * @param {*} b
+		 * The second value.
+		 *
+		 * @return {number}
+		 * Returns -1 if the first value is smaller than the second one.
+		 * Returns 0 if both values are equal.
+		 * Returns 1 if the first value is larger than the second one.
+		 */
+		naturalCompare: naturalCompare,
+
+		/**
+		 * Converts the given value to an array using toArray() if needed,
+		 * performs a numerical sort using naturalCompare() and returns the
+		 * result. If the input already is an array, no copy is being made
+		 * and the sorting is performed in-place.
+		 *
+		 * @see toArray
+		 * @see naturalCompare
+		 *
+		 * @param {*} val
+		 * The input value to sort (and convert to an array if needed).
+		 *
+		 * @return {Array<*>}
+		 * Returns the resulting, numerically sorted array.
+		 */
+		sortedArray: function(val) {
+			return this.toArray(val).sort(naturalCompare);
+		},
+
 		/**
 		 * Converts the given value to an array. If the given value is of
 		 * type array, it is returned as-is, values of type object are