[Feature proposal] Add :description function to org-link-parameters

[Ihor Radchenko <yantar92@gmail.com>]

Hi,

Wondering if anyone is interested in adding a new org-link property to
customise generating the link description.

For now, there is global org-link-make-description-function, which is
shared among all the link types. If would be more convenient if the
description function can be set independently for different link types.

I propose to use :description property in org-link-parameters. A sample
implementation working with current org version is below:

#+begin_src emacs-lisp
(defun yant/org-make-link-description-function (link desk)
  "Return description of the link LINK according to :description link property.
Return DESK if :desk is not set."
  (let ((fun (org-link-get-parameter (car (split-string link ":")) :description)))
    (if (functionp fun)
	(funcall fun link desk)
      desk)))

(setq org-make-link-description-function #'yant/org-make-link-description-function)
#+end_src

Example usage:

#+begin_src emacs-lisp
(defun org-id-link-desk (link desk)
  "Description function for id: link."
  (let ((id (cadr (split-string link ":"))))
    (org-with-point-at (org-id-find id 'marker)
      (s-replace "||" "/" (yant/task-fulltitle)))))

(org-link-set-parameters "id" 
                         :desk #'org-id-link-desk)
#+end_src

Best,
Ihor


-- 
Ihor Radchenko,
PhD,
Center for Advancing Materials Performance from the Nanoscale (CAMP-nano)
State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an, China
Email: yantar92@gmail.com, ihor_radchenko@alumni.sutd.edu.sg