Add upstream

wp-content/plugins/jetpack/modules/shortcodes/upcoming-events.php

@@ -0,0 +1,51 @@
+<?php // phpcs:ignore WordPress.Files.FileName.InvalidClassFileName
+
+/**
+ * Display a list of upcoming events from a calendar.
+ *
+ * @package Jetpack
+ */
+
+/**
+ * Register a upcomingevents shortcode.
+ * Most of the heavy lifting done in iCalendarReader class,
+ * where the icalendar_render_events() function controls the display.
+ */
+class Upcoming_Events_Shortcode {
+
+	/**
+	 * Register things.
+	 */
+	public static function init() {
+		add_shortcode( 'upcomingevents', array( __CLASS__, 'shortcode' ) );
+	}
+
+	/**
+	 * Register the shortcode.
+	 *
+	 * @param array $atts Shortcode attributes.
+	 */
+	public static function shortcode( $atts = array() ) {
+		jetpack_require_lib( 'icalendar-reader' );
+		$atts   = shortcode_atts(
+			array(
+				'url'    => '',
+				'number' => 0,
+			),
+			$atts,
+			'upcomingevents'
+		);
+		$args   = array(
+			'context' => 'shortcode',
+			'number'  => absint( $atts['number'] ),
+		);
+		$events = icalendar_render_events( $atts['url'], $args );
+
+		if ( ! $events ) {
+			$events = sprintf( '<p>%s</p>', __( 'No upcoming events', 'jetpack' ) );
+		}
+
+		return $events;
+	}
+}
+add_action( 'plugins_loaded', array( 'Upcoming_Events_Shortcode', 'init' ), 101 );