What if you set the category in the function? So the function has something like cond (( or (org-category vacation) (org-category f_event)
(background: red))

I obviously don't know how to write it, but the idea is that the categories are already set in the function. I won't have many, three tops, and I won't change them often -- no need to be fully dynamic.

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-------- Original Message --------
On Jan 27, 2019, 15:35, Ken Mankoff wrote:

> Hi,
>
> On 2019-01-27 at 12:20 -0800, JRSS <jarss@protonmail.com> wrote...
>> This is a bit over my head still. I'm trying to wrap my head around it.
>>
>> I see what it does (colors day-of-the-week 1 and day-of-the-week-3,
>> which are Monday and Wednesday, red) but not sure how to tie it to a
>> category (so say, category "vacation" would be red).
>>
>> Once I have the function do that, I can go in and change it so that
>> different categories will be different colors.
>
> It's a bit over my head for this use case too. Sorry. When I saw it I thought the use case was a list of holidays, which is easier to implement. You could maintain this list in an easy-to-access format as a variable near where you implement this function. A dynamic list based on tagged Org items is certainly more complicated.
>
> -k.