Allow formula in rates

[gedex]

Originally reported by @solaceten in #12

2. Also, there does not seem to be an easy way to add a discount or supplement for e.g. a one night stay.

I imagine this could be as simple as adding an additional field in the "Rates" row? Something along the lines of Range of Number of Nights - this will allow users to add a discount or supplement accordingly?

As an temp fix, I came up with the following, and have added it to woocommerce-bookings/includes/class-wc-booking-form.php - however it's not working quite right - can you take a look?

[solaceten]

OK I got the following to work - hope this helps anyone else that needs something similar.

I know it's a dirty hack that the developers may / will probably strongly disapprove of, but it works for me as a temporary solution - feel free to suggest improvements. Disclaimer: this will be overwritten when you update bookings. Use at your own risk!

added to bottom of file woocommerce-bookings/includes/class-wc-booking-form.php

// Around Line 870 - original code
           // Person multiplier mutliplies all costs
    $this->booking_cost = max( 0, $total_block_cost + $base_cost );

// this added to add on a single night supplement cost of $20        
$booking_length = $data['duration'];
$override_block = apply_filters( 'woocommerce_bookings_process_cost_rules_override_block', ( isset( $fields['override_block'] ) ? $fields['override_block'] : '' ), $fields, $key );
$cost = apply_filters( 'woocommerce_bookings_process_cost_rules_cost', $fields['cost'], $fields, $key );
        $singlesupp  = '20.00';

             if ( $booking_length ==1 ) {

                $this->booking_cost = $total_block_cost + $base_cost + $override_block + $cost + $singlesupp;  

                     } 
``

[SiR-DanieL]

More need for this in 27078799-hc

[nicholasjeberlin]

6559594-zen

[Sukalo0290]

As per (#171)

Why hasn't the Bookable Range types been utilised for the Accom add-on?