org-context at the beginning of a link

org-context at the beginning of a link

[Alan Schmitt]

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Hello,

I'm using a function that relies on `org-element-link-parser'. According
to the documentation, the point needs to be at the element of the link
for it to work. I wrote a small function that takes me to the beginning
of a link, but it fails when the point is already at the beginning of
the link. Here is a reproducible recipe showing the problem.

Open this attached tiny org file: 

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Start

[[file:link.org][link]]

End

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Put the point on the 'i' of "link", for instance by (goto-char 26).

Look up the context: (org-context). I get ((:link 8 31))

Go to the beginning of the link: (goto-char 8)

Look up the context: (org-context). I get ((:link nil 31))

Is there a reason why the context is different at the beginning of the
link?

Thanks,

Alan

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Re: org-context at the beginning of a link

[Nicolas Goaziou]

Hello,

Alan Schmitt <alan.schmitt@polytechnique.org> writes:

> I'm using a function that relies on `org-element-link-parser'. According
> to the documentation, the point needs to be at the element of the link
> for it to work.

Not what you are asking for, but it is probably wrong to call this
function directly. If you want to parse something, it's better to use
`org-element-context' (or `org-element-at-point' but it doesn't fit
here).

> I wrote a small function that takes me to the beginning
> of a link, but it fails when the point is already at the beginning of
> the link. Here is a reproducible recipe showing the problem.
>
> Open this attached tiny org file: 
> Start
>
> [[file:link.org][link]]
>
> End
>
> Put the point on the 'i' of "link", for instance by (goto-char 26).
>
> Look up the context: (org-context). I get ((:link 8 31))
>
> Go to the beginning of the link: (goto-char 8)
>
> Look up the context: (org-context). I get ((:link nil 31))
>
> Is there a reason why the context is different at the beginning of the
> link?

I don't know, but `org-context' is very different from
`org-element-context'. You probably mean to use the latter.


Regards,

-- 
Nicolas Goaziou

Re: org-context at the beginning of a link

[Alan Schmitt]

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On 2014-11-21 23:37, Nicolas Goaziou <mail@nicolasgoaziou.fr> writes:

> Hello,
>
> Alan Schmitt <alan.schmitt@polytechnique.org> writes:
>
>> I'm using a function that relies on `org-element-link-parser'. According
>> to the documentation, the point needs to be at the element of the link
>> for it to work.
>
> Not what you are asking for, but it is probably wrong to call this
> function directly. If you want to parse something, it's better to use
> `org-element-context' (or `org-element-at-point' but it doesn't fit
> here).

Thank you for the suggestion. The reason I was using `org-context' is
because it is used in `org-next-link'.

Here is what I ended up doing. It works great, but please don't hesitate
to criticize is.

#+begin_src emacs-lisp
(defun as/org-link-p (elt)
  (eq 'link (org-element-type elt)))

(defun as/fetch-element-link (elt)
  (org-element-property :raw-link elt))

(defun as/fetch-current-or-next-link ()
  (let ((elt (org-element-context)))
    (save-excursion
      (as/fetch-element-link
       (if (as/org-link-p elt)
           elt
         (progn (org-next-link) (org-element-context)))))))
#+end_src

Alan

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