From mboxrd@z Thu Jan  1 00:00:00 1970
From: stardiviner <numbchild@gmail.com>
Subject: Re: [ANN] Changes to link syntax
Date: Tue, 26 Mar 2019 17:08:06 +0800
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To: Nicolas Goaziou <mail@nicolasgoaziou.fr>
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Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:

> stardiviner <numbchild@gmail.com> writes:
>
>> Hi, @Nicolas, will you release a method to update all existing Org
>> file links?
>
> On second though, you may want to test the following:
>
>   (defun org-update-link-syntax ()
>     "Update syntax for links in current buffer."
>     (org-with-point-at 1
>       (let ((case-fold-search t))
>         (while (re-search-forward "\\[\\[[^]]*?%\\(?:2[05]\\|5[BD]\\)" nil t)
>           (let ((object (save-match-data (org-element-context))))
>             (when (and (eq 'link (org-element-type object))
>                        (= (match-beginning 0)
>                           (org-element-property :begin object)))
>               (goto-char (org-element-property :end object))
>               (let* ((uri-start (+ 2 (match-beginning 0)))
>                      (uri-end (save-excursion
>                                 (goto-char uri-start)
>                                 (re-search-forward "\\][][]" nil t)
>                                 (match-beginning 0)))
>                      (uri (buffer-substring-no-properties uri-start uri-end))
>                      (start 0))
>                 (when (catch :obsolete
>                         (while (string-match "%\\(..\\)?" uri start)
>                           (setq start (match-end 0))
>                           (unless (member (match-string 1 uri)
>                                           '("25" "5B" "5D" "20"))
>                             (throw :obsolete nil)))
>                         (y-or-n-p
>                          (format "Possibly obsolete URI syntax: %S.  Update?"
>                                  uri)))
>                   (setf (buffer-substring uri-start uri-end)
>                         (org-link-escape (org-link-decode uri)))))))))))
>                 


I applied your function in my testing Org file. most links are updated. Except
some links. I think this link is not detected.

#+begin_src org
[[file:~/Org/Wiki/Computer%20Technology/Softwares/%E9%9A%8F%E6%89%8B%E8%AE%B0.org::*Export%20through%20Web%20client][Export through Web client]]
#+end_src

Also, I might write a command to using your suggested ~dolist~ and
~directory-files-recursively~.

-- 
[ stardiviner ]
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