Adding installation hook

Author: dcooney

ajax-load-more-for-searchwp.php

@@ -14,6 +14,39 @@
  * @package ALM_SearchWP
  */
 
+if ( ! defined( 'ABSPATH' ) ) {
+	exit;
+}
+
+/**
+ *  Installation hook.
+ */
+function alm_searchwp_install() {
+	if ( ! is_plugin_active( 'ajax-load-more/ajax-load-more.php' ) ) {
+		set_transient( 'alm_searchwp_admin_notice', true, 5 );
+	}
+}
+register_activation_hook( __FILE__, 'alm_searchwp_install' );
+
+/**
+ * Display admin notice if plugin does not meet the requirements.
+ */
+function alm_searchwp_admin_notice() {
+	$slug   = 'ajax-load-more';
+	$plugin = $slug . '-for-searchwp';
+	// Ajax Load More Notice.
+	if ( get_transient( 'alm_searchwp_admin_notice' ) ) {
+		$install_url = get_admin_url() . '/update.php?action=install-plugin&plugin=' . $slug . '&_wpnonce=' . wp_create_nonce( 'install-plugin_' . $slug );
+		$message     = '<div class="error">';
+		$message    .= '<p>You must install and activate the core Ajax Load More plugin before using the Ajax Load More SearchWP extension.</p>';
+		$message    .= '<p>' . sprintf( '<a href="%s" class="button-primary">%s</a>', $install_url, 'Install Ajax Load More Now' ) . '</p>';
+		$message    .= '</div>';
+		echo wp_kses_post( $message );
+		delete_transient( 'alm_searchwp_admin_notice' );
+	}
+}
+add_action( 'admin_notices', 'alm_searchwp_admin_notice' );
+
 if ( ! class_exists( 'ALM_SearchWP' ) ) :
 
 	/**