+1 for this propose.

I have one situation need this feature.

Assume a file structure like bellowing:

#+begin_example
`- folder-1
  `- file-1.org
  `- folder-1.2
    ` file-1.2.1.org
#+end_example

When I try to add link of "file-1.org" in "file-1.2.1.org", based on my
custom option `org-link-file-path-type' value `adaptive'. The link will
become a full-path link. But I want link to be relative to current Org
file path. The file link path should be [[file:../file-1.org]] instead
of [[file:folder-1/file-1.org]]. I hope I can use a custom function in
conditions to decide the file path.

Ihor Radchenko <yantar92@posteo.net> writes:

> 西 顾 <z.ref@outlook.com> writes:
>
>> I'd like to suggest a small enhancement to the
>> 'org-link-file-path-type' option. When set to 'function', it currently
>> passes an absolute path to the user's custom function. This limits
>> flexibility as the original path input is not available to the
>> function.
>>
>> For better customization, I propose passing the raw path to the
>> function. Users needing an absolute path could use 'expand-file-name'
>> within their function.
>
> Thanks for the suggestion!
>
> This makes sense - the current approach with passing absolute path is
> indeed limiting the information passed to the custom function.
>
> The docstring is also quite ambiguous about what is passed as an
> argument:
>
>     org-link-file-path-type is a customizable variable defined in ol.el.
>     <...>
>     Alternatively, users may supply a custom function that takes the
>     full filename as an argument and returns the path.
>
> "full filename" may or may not mean "absolute filename".
>
> However, changing the absolute path to "as is" path will technically be
> breaking.
>
> I cannot find any actual uses of custom function value for
> `org-link-file-path-type' in the wild, so I am leaning towards going
> ahead with this (minor) breaking change.
>
> Yet, I am starting a poll to give users who may be affected a chance to
> chime in.


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