In that case:

#+BEGIN_SRC emacs-lisp
(defun file-description (start end path bracketp)
  (put-text-property start end 'display (shell-command-to-string
(format "file %s" path))))

(org-link-set-parameters
 "file"
 :activate-func 'file-description)
#+END_SRC

With this, you have to have a way to insert links that isn't typing them in
by hand; as soon as emacs recognizes the link, it changes the display which
makes it hard to type.

The shell command puts a long string, so you might replace that with
something that has the output you wanted above.
John

-----------------------------------
Professor John Kitchin
Doherty Hall A207F
Department of Chemical Engineering
Carnegie Mellon University
Pittsburgh, PA 15213
412-268-7803
@johnkitchin
http://kitchingroup.cheme.cmu.edu



On Sat, Feb 22, 2020 at 11:55 PM stardiviner <numbchild@gmail.com> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
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>
> John Kitchin <jkitchin@andrew.cmu.edu> writes:
>
> > I think you are looking for the :activate-func property of a link. What
> > you want is somewhat tricky though, how would you edit the link?
> >
> > There is an example at
> >
> https://kitchingroup.cheme.cmu.edu/blog/2016/11/04/New-link-features-in-org-9/#org069cbfa
>
> Thanks for your tips. Helpful!!
>
> >
> > that might give you some ideas. You can use a 'display text property to
> > change the appearance, but you need some way to remove this if you want
> > to edit or see the original version.
>
> I usually edit link with =[C-c C-l]= to edit link URL and description, not
> literally.
>
> >
> > stardiviner <numbchild@gmail.com> writes:
> >
> >> -----BEGIN PGP SIGNED MESSAGE-----
> >> Hash: SHA256
> >>
> >>
> >> I have a requirement, I want to display file: link's file type info on
> the link.
> >>
> >> For example, an Org file: link
> >>
> >> #+begin_src org
> >> [[file:~/Org/logo.png][logo]]
> >> [[file:~/Org/document.pdf][document]]
> >> [[file:~/Org/book.epub][book]]
> >> #+end_src
> >>
> >> I want to display link as:
> >>
> >> #+begin_src org
> >> logo (image: png)
> >> document (document: pdf)
> >> book (ebook: epub)
> >> #+end_src
> >>
> >> I'm inspired by this code snippet:
> >>
> >> #+begin_src emacs-lisp
> >> (org-link-set-parameters
> >>  "file+sys"
> >>  :complete 'org-file-complete-link
> >>  :face (lambda (path) (if (file-exists-p path) 'org-link 'org-warning)))
> >> #+end_src
> >>
> >> Is it possible to display those info between parentheses with an
> overlay or
> >> propertied text?
> >>
> >> If someone have any idea or how to implement this, please help me.
> Thanks in advanced.
> >>
> >> - --
> >> [ stardiviner ]
> >>        I try to make every word tell the meaning what I want to express.
> >>
> >>        Blog: https://stardiviner.github.io/
> >>        IRC(freenode): stardiviner, Matrix: stardiviner
> >>        GPG: F09F650D7D674819892591401B5DF1C95AE89AC3
> >>
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>
>
> - --
> [ stardiviner ]
>        I try to make every word tell the meaning what I want to express.
>
>        Blog: https://stardiviner.github.io/
>        IRC(freenode): stardiviner, Matrix: stardiviner
>        GPG: F09F650D7D674819892591401B5DF1C95AE89AC3
>
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