ACF Options Page Monitoring (#206)

* Adds monitoring for acf option pages and introduces Utils class for helpers.

* formatting

* more formatting

* check if acf_get_options_pages is returning an array

Co-authored-by: Tyler Barnes <tylerdbarnes@gmail.com>

src/ActionMonitor/Monitors/AcfMonitor.php

@@ -2,6 +2,8 @@
 
 namespace WPGatsby\ActionMonitor\Monitors;
 
+use WPGatsby\Utils\Utils;
+
 class AcfMonitor extends Monitor {
 
 	public function init() {
@@ -28,8 +30,41 @@ function() {
 			}
 		);
 
-		// @todo: Add support for tracking ACF Options Fields.
-
+        add_action('acf/save_post', [$this, 'after_acf_save_post'], 20);
 	}
 
+    /**
+     * Handles content updates of ACF option pages.
+     */
+    public function after_acf_save_post() {
+        $option_pages = acf_get_options_pages();
+
+        if ( ! is_array( $option_pages ) ) {
+            return;
+        }
+
+        $option_pages_slugs = array_keys( $option_pages );
+
+        /**
+         * Filters the $option_pages_slugs array.
+         *
+         * @since 2.1.2
+         *
+         * @param	array $option_pages_slugs Array with slugs of all registered ACF option pages.
+         */
+        $option_pages_slugs = apply_filters(
+			'gatsby_action_monitor_tracked_acf_options_pages',
+			$option_pages_slugs
+		);
+
+        $screen = get_current_screen();
+
+        if(
+			! empty( $option_pages_slugs ) 
+			&& is_array( $option_pages_slugs )
+			&& Utils::str_in_substr_array( $screen->id, $option_pages_slugs )
+		) {
+            $this->trigger_non_node_root_field_update();
+        }
+    }
 }

src/Utils/Utils.php

@@ -0,0 +1,27 @@
+<?php
+
+namespace WPGatsby\Utils;
+
+class Utils {
+
+    /**
+     * Checks if any of the strings in $substr_array is a substring in the $haystack.
+     *
+     * @since 2.1.2
+     *
+     * @param string $haystack
+     * @param array $substr_array
+     * @param int $offset
+     *
+     * @return bool
+     */
+    public static function str_in_substr_array(string $haystack, array $substr_array, int $offset = 0): bool {
+        foreach ( $substr_array as $substr ) {
+            if ($substr && strpos($haystack, $substr, $offset) !== false ) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+}