Re: anyway to create link to a line number in a file

[Nick Dokos <nicholas.dokos@hp.com>]

Nick Dokos <nicholas.dokos@hp.com> wrote:

> Not To Miss <not.to.miss@gmail.com> wrote:
> 
> > I looked that section carefully and the whole manual briefly. I
> > haven't found anything yet. That's why I am asking on the mailing list
> > to see if anyone has some workaround.
> > 
> > On Sat, Feb 18, 2012 at 9:03 AM, Sean O'Halpin <sean.ohalpin@gmail.com> wrote:
> > > On Fri, Feb 17, 2012 at 4:54 PM, Not To Miss <not.to.miss@gmail.com> wrote:
> > >> Hi all,
> > >>
> > >> I am reading a long text file and want to write down my notes with
> > >> org-mode. I extremely would like to put the line numbers down along
> > >> with my notes. Although there is a way to store a link for text search
> > >> for the current line, I haven't found a way to create a link to a line
> > >> number in the current buffer. Is there anyway to do that? Thanks
> > >
> > > Take a look at org-capture: http://orgmode.org/manual/Capture.html
> 

> The problem is to make sure org-store-link will actually store the line
> number (along with everything else) so that then org-insert-link can
> insert the link in the proper format. I don't think there is a function
> to do that out of the box for line numbers, but you can easily (for some
> value of "easily") write your own. Look in
> 
> (info "(org)Adding hyperlink types")
> 
> for some hints. Briefly, you write a function that checks whether it
> wants to deal with the link or not, and you add it to
> org-store-link-functions. I don't have the time to try it out right now,
> but I believe this should work for what you want.
> 

Following up on this, the following seems to work, although you probably
want to tweak the criterion of when you want *this* function to take
care of links - this particular implementation only applies the line
number treatment to links generated in the file named
"/path/to/the.file.txt" and only that file:

--8<---------------cut here---------------start------------->8---
(defun org-file-lineno-store-link()
  (when (string-equal (buffer-file-name) "/path/to/the.file.txt")
    (let* ((link (format "file:%s::%d" (buffer-file-name) (line-number-at-pos))))
      (org-store-link-props
       :type "file"
       :link link))))

(add-hook 'org-store-link-functions 'org-file-lineno-store-link)
--8<---------------cut here---------------end--------------->8---

Nick