swooningfish · August 16, 2018 11:26 · Oct 19, 2016
diff --git a/cs-repeater-download.php b/cs-repeater-download.php
@@ -0,0 +1,136 @@
+<?php
+/**
+ * Plugin Name: CS Repeater Download
+ * Plugin URI: https://casperschultz.dk
+ * Description: Plugin for downloading repeater field data.
+ * Author: Casper Schultz
+ * Author URI: https://casperschultz.dk
+ * Text Domain: cs-repeater-download
+ * Domain Path: /lang/
+ * Version: 1.0
+ */
+
+namespace CasperSchultz\ACF\RepeaterDownload;
+
+/**
+ * Class CS_Repeater_Download
+ * @package CasperSchultz\ACF\RepeaterDownload
+ */
+class CS_Repeater_Download {
+
+	protected $repeater;
+
+	public function __construct() {
+    // @TODO add the repeater name that are to be downloadable.
+		$this->repeater = 'team_attendants'; // Name of the repeater field that are to be downloadable.
+    // @TODO add the post type that the download button should be displayed at.
+		$this->post_types = 'hold'; // The post type that the download metabox is to be displayed at.
+		$this->init();
+	}
+
+	public function init() {
+
+		// Register meta box.
+		add_action( 'add_meta_boxes', array( $this, 'register_meta_boxes' ) );
+
+		// Add a new custom endpoint for the download rule.
+		add_action( 'init', array( $this, 'add_rewrite_rule' ) );
+		add_filter( 'query_vars', array( $this, 'add_query_vars' ) );
+
+		// Generate the file.
+		add_action( 'parse_request', array( $this, 'parse_request' ) );
+	}
+
+	/**
+	 * Handle the custom endpoint we added.
+	 */
+	public function parse_request( $wp ) {
+
+		// If the key does not exist, stop execution.
+		if ( ! array_key_exists( 'cs-repeater-page-id', $wp->query_vars ) ) {
+			return;
+		}
+
+		$page = absint( $wp->query_vars['cs-repeater-page-id'] );
+		$output = '';
+
+		if( have_rows( $this->repeater, $page ) ) {
+
+			$rows = get_field( $this->repeater, $page );
+			$field_count = count( $rows[0] );
+
+			foreach ( $rows as $fields ) {
+
+				$count = 1;
+
+				foreach ( $fields as $value ) {
+					$output .= $value;
+					$count++;
+					if ( $count < $field_count ) {
+						$output .= ',';
+					}
+				}
+
+				$output .= "\n";
+			}
+		}
+
+		// Send the downloadable file.
+		header("Content-type: text/plain");
+		header("Content-Disposition: attachment; filename=attendants.txt");
+
+		// Print the content.
+		print $output;
+		exit();
+	}
+
+	/**
+	 * Add the needed query args.
+	 */
+	public function add_query_vars( $query_vars ) {
+		$query_vars[] = 'cs-repeater-page-id';
+		return $query_vars;
+	}
+
+	/**
+	 * Adds a rewrite rule for our downloadable file.
+	 */
+	public function add_rewrite_rule() {
+		add_rewrite_rule( '^cs-repeater-download/([0-9]+)/?', 'index.php?cs-repeater-page-id=$matches[1]', 'top' );
+	}
+
+	/**
+	 * Register meta box(es).
+	 */
+	public function register_meta_boxes() {
+		add_meta_box( 'meta-box-id', __( 'Download teams', 'cs-repeater-download' ), array( $this, 'meta_box_callback' ), $this->post_types, 'side' );
+	}
+
+	/**
+	 * Meta box display callback.
+	 *
+	 * @param \WP_Post $post Current post object.
+	 */
+	public function meta_box_callback( $post ) {
+		?>
+			<p><?php _e( 'Download the teams as a comma seperated file (csv)', 'cs-repeater-download' ) ?></p>
+			<a href="<?php get_site_url() ?>/cs-repeater-download/<?php echo $post->ID ?>" class="button button-primary button-large"><?php _e( 'Download', 'cs-repeater-download' ) ?></a>
+		<?php
+	}
+}
+
+/**
+ * Run the plugin.
+ */
+function init() {
+	new CS_Repeater_Download();
+}
+init();
+
+/**
+ * Need to flush rewrite rules on plugin activation.
+ */
+register_activation_hook( __FILE__, function() {
+	add_rewrite_rule( '^cs-repeater-download/([0-9]+)/?', 'index.php?cs-repeater-page-id=$matches[1]', 'top' );
+	flush_rewrite_rules();
+} );