I'm following these instructions https://www.gnu.org/software/emacs/manual/html_node/emacs/Holiday-Customizing.html to try and add Colombian holidays but I haven't been able to add holidays of the form "on the 29th of June if its a Monday or on the next monday".

Can anyone help me with a holiday-sexp that will achieve this?

Note: I'm an elisp noob


The expression you're looking for is

(holiday-sexp '(calendar-nth-named-day 1 1 6 year 29)
              "St Peter and St Paul")

I recommend you look at the function's documentation (C-h f calendar-nth-named-day RET) for an explanation of its arguments. Here, the symbol year is bound for you by holiday-sexp, so you don't need to define it.

Usually custom holidays are added to the list holiday-other-holidays, either in one swell foop like so:

(setq holiday-other-holidays
      '((holiday-sexp '(calendar-nth-named-day 1 1 6 year 29)
                      "St Peter and St Paul")))

or incrementally, like so:

(add-to-list 'holiday-other-holidays
             '(holiday-sexp '(calendar-nth-named-day 1 1 6 year 29)
                            "St Peter and St Paul"))

Note that the calendar-nth-named-day sexp must be quoted even within another quoted expression, as holiday-sexp evals its arguments.

  • Can you fix the command for accessing the function documentation? It should be C-h f May 11 '17 at 14:07

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