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I am searching for the best strategy to define custom behaviour for file: org-links locally to a buffer. Is there a way to modify or redefine this type of org-link ?

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I think you need to tweak org-open-at-point of org.el. It contains the following lines:

((string= type "file")
 (if (string-match "::\\([0-9]+\\)\\'" path)
     (setq line (string-to-number (match-string 1 path))
           path (substring path 0 (match-beginning 0)))
   (if (string-match "::\\(.+\\)\\'" path)
       (setq search (match-string 1 path)
             path (substring path 0 (match-beginning 0)))))
 (when (string-match "[*?{]" (file-name-nondirectory path))
   (dired path)
   (org-open-file path arg line search)
   )
 )

So if you'd manage to enclose the behavior you want in a variable, then you can adjust its value for a given buffer (for example it can contain a regexp, a binary name, or just some elisp code), and you are done.

What exactly you are trying to achieve?

  • I am using gitit to write a wiki; file links to pages behave differently in the org buffer and the resulting html wiki page, exported by pandoc, so I have to adapt org behaviour to gitit – csantosb Feb 19 '15 at 21:29
  • @csantosb: I still don't understand what exactly you are trying to achieve. – Adobe Feb 19 '15 at 21:41
  • Under gitit links to wiki pages must appear as [[file:/category1/category2/mypage][my-page]], regardless of the page they appear on, and they are relative to the top level. Problem is, this is meaningless to org, unless I redefine file: links locally – csantosb Feb 20 '15 at 12:55
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I guess the more elegant approach consist on setting locally org-link-abbrev-alist in some buffers, following its name, so that file: links get overloaded.

(setq-local org-link-abbrev-alist
        '(("file" . "%(custom logic)")))

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