Exclude tag from default agenda view

Question

In org-mode, M-x org-agenda a will display a built-in agenda view labeled "Agenda for current week or day". How can I exclude a tag from this view?

Parenthetical clarification

I know how to filter a tag out of this view after it is displayed, but I would like to add something to my configuration to exclude the tag by default.

I know how to exclude a tag from a custom agenda view, but I would like to exclude a tag from the built-in agenda view labeled "Agenda for current week or day".

Answer 1

I you don't want to see :foo:, this should exclude it:

(setq org-agenda-tag-filter-preset '("-foo"))

However, the doc string says:

This variable should not be set directly, but agenda custom commands can bind it in the options section.

So, let bind the variable before calling org-agenda by defining your own wrapper function:

(defun yashi/org-agenda (&optional arg)
  (interactive "P")
  (let ((org-agenda-tag-filter-preset '("-foo")))
   (org-agenda arg "a")))

And bind it to, say, F1

(bind-key "<f1>" 'yashi/org-agenda)

Answer 2

As Yasushi Shoji mentioned, the correct approach is to let-bind org-agenda-tag-filter-preset. To advise just the one pre-built agenda view, you'll want to use advice around the function org-agenda-list, which builds just that particular view. Try this:

(defun my/org-agenda-list-exclude-tags-advice (orig-fn &rest args)
  "Exclude selected tags from `org-agenda-list'.
Intended as :around advice for `org-agenda-list'."
  (let ((org-agenda-tag-filter-preset '("-foo")))
    (apply orig-fn args)))

(advice-add #'org-agenda-list :around #'my/org-agenda-list-exclude-tags-advice)