Customize: highlight-symbol-colors added only delta

Question

Windows 10, Emacs 25.1

By default package highlight-symbol has 9 colors. So I add new color, snow, to option highlight-symbol-colors:

Screenshot:

OK.

As a result Customize puts this in my init file:

(custom-set-variables

 '(highlight-symbol-colors
   (quote
    ("yellow" "DeepPink" "cyan" "MediumPurple1" "SpringGreen1" "DarkOrange" "HotPink1" "RoyalBlue1" "OliveDrab" "snow")))
 )

As you can see the variable highlight-symbol-colors contains all 10 colors, including "snow".

My question is:

How to make option highlight-symbol-colors contain ONLY the colors I add, and not also the colors that it has by default?

I want the result to be something like this:

(custom-set-variables
 '(highlight-symbol-colors
   (quote ("snow"))))

So as result I must use 10 colors.

Is this possible?

Answer 1

Of course. In Customize, just click DEL for each of the colors that you do not want to include.

INS inserts a color value. DEL deletes a color value.

---

UPDATE after your comment:

Your comment suggests that you want to use a function in your init file that takes only "snow" as argument and adds it to the value of highlight-symbol-colors. If not, it is really not clear what you are asking.

If that's what you want, then do it:

(defun foo (&rest colors)
  "Add COLOR to the value of `highlight-symbol-colors`."
  (customize-set-variable 'highlight-symbol-colors
                          (append highlight-symbol-colors colors)))

Then put this in your init file: (foo "snow").