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


On Sat, Feb 22, 2020 at 11:55 PM stardiviner <numbchild@gmail.com> wrote:
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Hash: SHA256


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
>>
>> -----BEGIN PGP SIGNATURE-----
>>
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>> =sZhk
>> -----END PGP SIGNATURE-----


- --
[ 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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