Sorting: Added book autosort logic

app/Sorting/SortSetOperationComparisons.php

@@ -0,0 +1,69 @@
+<?php
+
+namespace BookStack\Sorting;
+
+use BookStack\Entities\Models\Chapter;
+use BookStack\Entities\Models\Entity;
+
+/**
+ * Sort comparison function for each of the possible SortSetOperation values.
+ * Method names should be camelCase names for the SortSetOperation enum value.
+ * TODO - Test to cover each SortSetOperation enum value is covered.
+ */
+class SortSetOperationComparisons
+{
+    public static function nameAsc(Entity $a, Entity $b): int
+    {
+        return $a->name <=> $b->name;
+    }
+
+    public static function nameDesc(Entity $a, Entity $b): int
+    {
+        return $b->name <=> $a->name;
+    }
+
+    public static function nameNumericAsc(Entity $a, Entity $b): int
+    {
+        $numRegex = '/^\d+(\.\d+)?/';
+        $aMatches = [];
+        $bMatches = [];
+        preg_match($numRegex, $a, $aMatches);
+        preg_match($numRegex, $b, $bMatches);
+        return ($aMatches[0] ?? 0) <=> ($bMatches[0] ?? 0);
+    }
+
+    public static function nameNumericDesc(Entity $a, Entity $b): int
+    {
+        return -(static::nameNumericAsc($a, $b));
+    }
+
+    public static function createdDateAsc(Entity $a, Entity $b): int
+    {
+        return $a->created_at->unix() <=> $b->created_at->unix();
+    }
+
+    public static function createdDateDesc(Entity $a, Entity $b): int
+    {
+        return $b->created_at->unix() <=> $a->created_at->unix();
+    }
+
+    public static function updatedDateAsc(Entity $a, Entity $b): int
+    {
+        return $a->updated_at->unix() <=> $b->updated_at->unix();
+    }
+
+    public static function updatedDateDesc(Entity $a, Entity $b): int
+    {
+        return $b->updated_at->unix() <=> $a->updated_at->unix();
+    }
+
+    public static function chaptersFirst(Entity $a, Entity $b): int
+    {
+        return ($b instanceof Chapter ? 1 : 0) - (($a instanceof Chapter) ? 1 : 0);
+    }
+
+    public static function chaptersLast(Entity $a, Entity $b): int
+    {
+        return ($a instanceof Chapter ? 1 : 0) - (($b instanceof Chapter) ? 1 : 0);
+    }
+}