Re: open link in source code block

["Berry, Charles" <ccberry@ucsd.edu>]

> On Jan 16, 2019, at 3:43 PM, Win Treese <treese@acm.org> wrote:
> 
> [Quoting trimmed for the most relevant context.]
> 
>> On Jan 11, 2019, at 7:12 PM, Berry, Charles <ccberry@ucsd.edu> wrote:
>> 
>>> On Jan 5, 2019, at 7:41 AM, Win Treese <treese@acm.org> wrote:
>>> 
>>>> On Jan 5, 2019, at 5:25 AM, Eric S Fraga <esflists@gmail.com> wrote:
>>>> 
>>>> On Friday,  4 Jan 2019 at 19:38, Win Treese wrote:
>>>>> Suppose I have the following Org file contents:
>>>>> 
>>>>> * test
>>>>> 
>>>>> #+BEGIN_SRC emacs-lisp
>>>>> (setq yyy 3)
>>>>> ;; See https://www.gnu.org
>>>>> #+END_SRC
>>>>> 
>>>>> The URL for gnu.org is highlighted as a clickable link. But if I click
>>>>> it, the source block is evaluated. This seems rather unexpected,
>>>>> especially since my intention was to open the link.
>>>> 
>>>> Probably expected albeit maybe not your preferred behaviour; all about
>>>> precedence.  In any case, I would suggest that the easy solution would
>>>> be to move such links out of the src block. 
> 
>>> This seems like a slightly bigger problem, though: clicking on a highlighted
>>> link doesn’t just fail to open the link, it executes the source block, which can
>>> have very unintended side effects.
>>> 
>>> I wonder if the issue is an artifact of implementation rather than intentional
>>> design: org-open-at-mouse sets point to the location of the click and then
>>> calls org-open-at-point. The documentation at points says that C-c C-o in 
>>> a source block opens the results of evaluation (fair enough, although the
>>> docstring does not).
>>> 
>>> So the problem seems to be about the mouse click behavior, not the basic
>>> function of org-open-at-point.
>> 
>> AFAICS, the issue is with org-open-at-point.
>> 
>> If you really want to `fix' this, there is a hook that allows customization of the behavior of org-open-at-point.
>> 
>> This snippet will add a function to that hook that will attempt to follow a link, when you click on a link in a src-block:
> 
> [Example code with function added to org-open-at-point-functions elided.]
> 
> Chuck,
> 
> Thanks for the code. You’re right—the proximate problem is in org-open-at-point.
> Unfortunately, org-open-at-point calls org-babel-open-src-block-result first thing,
> wrapped by unless, before it gets to running the hook.


TL;DR: "org-open-at-point calls org-babel-open-src-block-result first thing" is not true.

The `unless' COND argument starting around line 5 of the code of `org-open-at-point' runs the hooks in `org-open-at-point-functions'. 

If any hook returns a non-nil then `run-hook-with-args-until-success' returns the value and the BODY forms will not be run.

For example, this: 

	((eq type 'src-block) (org-babel-open-src-block-result))

is part of a BODY form and can only run if all those hooks return nil (or if there is no hook).

The code I provided works as advertised.

HTH,

Chuck

p.s. I am using Org mode version 9.2 (release_9.2-193-ge7901c...