first version

kirby/src/Cms/SiteActions.php

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+<?php
+
+namespace Kirby\Cms;
+
+use Closure;
+use Kirby\Data\Data;
+use Kirby\Exception\InvalidArgumentException;
+use Kirby\Toolkit\F;
+use Kirby\Toolkit\Str;
+
+trait SiteActions
+{
+
+    /**
+     * Commits a site action, by following these steps
+     *
+     * 1. checks the action rules
+     * 2. sends the before hook
+     * 3. commits the store action
+     * 4. sends the after hook
+     * 5. returns the result
+     *
+     * @param string $action
+     * @param mixed ...$arguments
+     * @return mixed
+     */
+    protected function commit(string $action, array $arguments, Closure $callback)
+    {
+        $old   = $this->hardcopy();
+        $kirby = $this->kirby();
+
+        $this->rules()->$action(...$arguments);
+        $kirby->trigger('site.' . $action . ':before', ...$arguments);
+        $result = $callback(...$arguments);
+        $kirby->trigger('site.' . $action . ':after', $result, $old);
+        $kirby->cache('pages')->flush();
+        return $result;
+    }
+
+    /**
+     * Change the site title
+     *
+     * @param string $title
+     * @param string|null $languageCode
+     * @return self
+     */
+    public function changeTitle(string $title, string $languageCode = null): self
+    {
+        return $this->commit('changeTitle', [$this, $title, $languageCode], function ($site, $title, $languageCode) {
+            return $site->save(['title' => $title], $languageCode);
+        });
+    }
+
+    /**
+     * Creates a main page
+     *
+     * @param array $props
+     * @return Page
+     */
+    public function createChild(array $props)
+    {
+        $props = array_merge($props, [
+            'url'    => null,
+            'num'    => null,
+            'parent' => null,
+            'site'   => $this,
+        ]);
+
+        return Page::create($props);
+    }
+
+    /**
+     * Clean internal caches
+     */
+    public function purge(): self
+    {
+        $this->children  = null;
+        $this->blueprint = null;
+        $this->files     = null;
+        $this->content   = null;
+        $this->inventory = null;
+
+        return $this;
+    }
+}