Custom order status for Woocommerce

class-woocommerce-order-status.php

<?php

class order_status_customisation {

  /**
   * Setup actions
   */
  static function setup() {
    add_action( 'init', __CLASS__ . '::adding_additional_order_statuses', 10 );
    add_filter( 'wc_order_statuses', __CLASS__ . '::add_awaiting_shipment_to_order_statuses', 10, 1 );
    add_action( 'admin_footer', __CLASS__ . '::status_styles', 10);
    add_action( 'admin_footer', __CLASS__ . '::bulk_admin_footer', 10 );

  }

  /**
   * Status to add to woocommerce
   * The KEY is the H in HSL. Thats a colour code
   * it means HUE, SATURATIONS, LIGHTNESS. This will
   * help differentiate between the order status'ssesss
   * @return [type] [description]
   */
  static function order_statuses() {
    $statuses = [
      96 => _x( 'Bytte', 'Order status' , 'craft-child-theme' ),
      13  => _x( 'Exist', 'Order status' , 'craft-child-theme' ),
    ];

    return apply_filters( 'craft_order_status_array', $statuses );
  }


  /**
   * Style the status marks

   */
  static function status_styles() {
    $statuses = self::order_statuses();

    if ( empty( $statuses ) ) {
      return;
    }

    echo '<style>';

    foreach ( $statuses as $key => $status ) {
      $name = self::stripper( $status );
      echo 'mark.' . $name . '::after { color: hsl( ' . $key . ', 70%, 50% ) }';
    }

    foreach ( $statuses as $key => $status ) {
      $name = self::stripper( $status );
      echo 'mark.' . $name . '::after,';
    }
    ?>
    .marks-all-resolved::after {
      content: "\e015";
      /* woo fonts */
      font-family: 'WooCommerce';
      speak: none;
      font-weight: normal;
      font-variant: normal;
      text-transform: none;
      line-height: 1;
      -webkit-font-smoothing: antialiased;
      margin: 0;
      text-indent: 0;
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      text-align: center;
    }
    <?php
    echo '</style>';
  }


  /**
   * Clean up the names from the order statuses
   * @param  [type] $string [description]
   * @return [type]         [description]
   */
  static function stripper( $string ) {

    //Lower case everything
    $string = strtolower( $string );

    //Make alphanumeric ( removes all other character s)
    $string = preg_replace( "/[^a-z0-9_\s-]/", "", $string );

    //Clean up multiple dashes or whitespaces
    $string = preg_replace( "/[\s-]+/", " ", $string );

    //Convert whitespaces and underscore to dash
    $string = preg_replace( "/[\s_]/", "-", $string );

    return $string;
  }


  /**
   * Register a batch of new order status
  **/
  static function adding_additional_order_statuses() {

    $statuses = self::order_statuses();

    if ( empty( $statuses ) ) {
      return;
    }

    foreach ( $statuses as $status ) {

      $name = 'wc-' . self::stripper( $status );

      register_post_status( $name, [
        'label'                     => $status,
        'public'                    => true,
        'exclude_from_search'       => false,
        'show_in_admin_all_list'    => true,
        'show_in_admin_status_list' => true,
        'label_count'               => _n_noop( $status . '<span class="count">(%s)</span>', $status . '<span class="count">(%s)</span>' )
      ] );
    }

  }

  /**
   * Add to list of WC Order statuses
   * @param [array] $order_statuses [return a list of the order statuses]
   */
  static function add_awaiting_shipment_to_order_statuses( $order_statuses ) {

    $new_order_statuses = [];

    // Add new order status after processing
    foreach ( $order_statuses as $key => $status ) {

      $new_order_statuses[ $key ] = $status;

      if ( 'wc-processing' === $key ) {

        $custom_statuses = self::order_statuses();
        foreach ( $custom_statuses as $custom_status ) {
          $name = 'wc-' . self::stripper( $custom_status );
          $new_order_statuses[ $name ] = $custom_status;
        }
      }
    }

    return $new_order_statuses;
  }

  /**
   * Add actions for the orders
   * @return [type] [description]
   */
  static function bulk_admin_footer() {
    global $post_type;

    if ( 'shop_order' == $post_type ) {
      ?>
      <script type="text/javascript">
        jQuery( function() {

        <?php
          $custom_statuses = self::order_statuses();
          foreach ( $custom_statuses as $custom_status ) {
            $name = self::stripper( $custom_status );
            ?>
            jQuery( '<option>' ).val( 'mark_<?php echo $name; ?>' ).text( '<?php echo _x( 'Mark as', 'Mark as processing or completed', 'craft-child-theme' ) . ' ' . $custom_status ?>' ).appendTo( 'select[name="action"]' );
            jQuery( '<option>' ).val( 'mark_<?php echo $name; ?>' ).text( '<?php echo _x( 'Mark as', 'Mark as processing or completed', 'craft-child-theme' ) . ' ' . $custom_status ?>' ).appendTo( 'select[name="action2"]' );
        <?php } ?>
        });
      </script>
      <?php
    }
  }
}