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emacs: Allow functions in notmuch-search-result-format

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If the car of an element in notmuch-search-result-format is a
function, insert the result of calling the function into the buffer.

This allows a user to generate custom fields in the output of a search
result. For example, with:

(defun -notmuch-result-flags (format-string result)
  (let ((tags-to-letters '(("flagged" . "!")
			   ("unread" . "u")
			   ("mine" . "m")
			   ("sent" . "s")
			   ("replied" . "r")))
	(tags (plist-get result :tags)))

    (format format-string
	    (mapconcat (lambda (t2l)
			 (if (member (car t2l) tags)
			     (cdr t2l)
			   " "))
		       tags-to-letters ""))))

(setq notmuch-search-result-format '((-notmuch-result-flags . "%s ")
				     ("date" . "%12s ")
				     ("count" . "%9s ")
				     ("authors" . "%-30s ")
				     ("subject" . "%s ")
				     ("tags" . "(%s)")))

The first few characters on each line of the search result are used to
show information about some significant tags associated with the
thread.
This commit is contained in:
David Edmondson 2021-02-21 15:19:01 +00:00 committed by David Bremner
parent 071fb57a35
commit 4f4ec48df2
1 changed files with 2 additions and 0 deletions
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emacs/notmuch.el
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@ -834,6 +834,8 @@ non-authors is found, assume that all of the authors match."
(defun notmuch-search-insert-field (field format-string result)
(pcase field
((pred functionp)
(insert (funcall field format-string result)))
("date"
(insert (propertize (format format-string (plist-get result :date_relative))
'face 'notmuch-search-date)))