Computing value from list lengths

[fatiparty--- via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

Jan 22, 2022, 00:19 by help-gnu-emacs@gnu.org:

> I have the following code and want to determine maxdepth
> automatically from the length of the dark-theme-colours and
> light-theme-colours (and changing the ahrd coded (dotimes (i 8)).
>
> What would be the strategy?
>
>
> (defcustom maxdepth 8
>   "Number of faces defined for colouring brace marks.
> Determines depth at which to cycle through faces again."
>   :type 'integer
>   :group 'test)
> (eval-when-compile
>   (defmacro colour-typeface ()
>
>     ( let ( (faces '())
>             (dark-theme-colours
>              [ "#ff62d4" "#3fdfd0" "#fba849" "#9f80ff"
>            "#4fe42f" "#fe6060" "#4fafff" "#f0dd60" ])
>         (light-theme-colours
>              [ "#a8007f" "#005f88" "#904200" "#7f10d0"
>            "#006800" "#b60000" "#1f1fce" "#605b00" ]) )
>
>       (dotimes (i 8)
>         (push
>          `( defface ,(intern (format "depth-%d-face" (1+ i)))
>             '( (default (:inherit richerenkov-base-face))
>                ( ((class color) (background dark))
>                  :foreground ,(aref dark-theme-colours  i) )
>                ( ((class color) (background light))
>                  :foreground ,(aref light-theme-colours i) ))
>             ,(format "Nested delimiter face, depth %d." (1+ i) )
>             :group 'colour-faces )
>          faces))
>
>       `(progn ,@faces) ) ))
>
> (colour-typeface)
>
Have started using (length dark-theme-colours), and changing "(dotimes (i 8)" to   
 "(dotimes (i n)".  How does one set the value to n, for o defcustom  such as maxdepth?