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Re: [O] How to change a link?
From: |
Thorsten Jolitz |
Subject: |
Re: [O] How to change a link? |
Date: |
Fri, 17 Oct 2014 00:19:15 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/24.3 (gnu/linux) |
Marcin Borkowski <address@hidden> writes:
> On 2014-10-15, at 23:52, Nicolas Goaziou wrote:
>
>> Marcin Borkowski <address@hidden> writes:
>>
>>> I have one more question. What I'm about to do is (basically) put
>>> "file:some-file-name::" in front of the link, without changing the
>>> description. I could use `org-element-put-property' and (AFAIU)
>>> org-element-link-interpreter to put it into the buffer (and probably
>>> delete the old one). It would be much easier (and maybe faster) just to
>>> go to the point in the buffer where the link starts, go `(forward-char
>>> 2)' (past the brackets) and `(insert (concat "file" name "::"))'.
>>>
>>> But, is it safe? Wouldn't it break something? And is it considered a
>>> good practice?
>>
>> There are caveats.
>>
>> For example, as soon as you alter the buffer, your AST becomes invalid
>> (buffer positions are all wrong after the insertion). If you want to
>> process all the links from the same AST, you can, for example, maintain
>> a counter for characters inserted so far that will fix buffer positions,
>> or first get all internal links with `org-element-map', then process
>> them in reverse order so buffer modifications do not invalidate them.
>
> OK, so what is the canonical way of doing this? I don't want to use
> org-dp, since it is another dependency.
It is a problem to add dependencies to libraries the user must install
himself, and at the same time its a pity that there is so much
duplication instead of reuse ...
However, here is a org-dp solution, use 't' instead of 'prepend to
replace the links, and whatever you want instead of "file+emacs" as
replacement. Of course one could easily re-search and replace "[[file:"
in this simple case, but this uses the parser and allows doing more
complex stuff in a clean way too:
,----
| * ORG SCRATCH
|
| ** Level 2
|
| [[file+emacs:~/junk/org/minimal.org][min.org]]
|
| [[file:~/junk/org/minimal.org][min.org]]
|
| *** Level 3
|
| [[file+emacs:~/junk/org/trash-me.org][trash.org]]
|
| [[file:~/junk/org/trash-me.org][trash.org]]
|
|
| #+BEGIN_SRC emacs-lisp :results none
| (require 'org-dp)
| (org-dp-map
| '(org-dp-rewire
| 'paragraph
| (lambda (cont elem)
| (let* ((link (car cont))
| (raw-val (org-element-property :raw-link link))
| (new-val (mapconcat 'identity
| (cons "file+emacs"
| (cdr
| (split-string
| raw-val ":" t)))
| ":")))
| (org-element-put-property link :raw-link new-val)))
| 'prepend)
| org-link-re-with-space t)
| #+END_SRC
`----
--
cheers,
Thorsten
- Re: [O] How to change a link?, (continued)
Re: [O] How to change a link?, Nicolas Goaziou, 2014/10/15
Re: [O] How to change a link?, Marcin Borkowski, 2014/10/17
Re: [O] How to change a link?, Thorsten Jolitz, 2014/10/18
Re: [O] How to change a link?, Marcin Borkowski, 2014/10/19