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Re: [O] Prevent auto-fill-mode from filling Property values in drawers


From: Kaushal Modi
Subject: Re: [O] Prevent auto-fill-mode from filling Property values in drawers
Date: Mon, 05 Feb 2018 21:59:40 +0000

On Sun, Feb 4, 2018 at 5:16 PM Nicolas Goaziou <address@hidden> wrote:
`org-return' doesn't call any auto fill function.

It sort of does, indirectly, via (newline). Please see the proposed patch at the end of this email.

Yet, it doesn't break properties drawers.

I agree. Though this patch fixes what <RET> shouldn't do when point is in the property drawer.

If someone has:

=====
* Headline
:PROPERTY:
:FOO: some long line that goes beyond fill column
:END:
=====

It would be highly unlikely that some would want to save that file as (assuming it got formatted as below because of auto filling):

=====
* Headline
:PROPERTY:
:FOO: some long line that goes beyond
fill column
:END:
=====

So the below patch prevents <RET> from doing the above
 
I don't think tweaking `org-return' is a good solution. This is not the
only way to break a line (e.g. "C-q C-j", or "C-M-o"), so it would not
be a panacea.

I tried C-q C-j and C-M-o, and both don't allow the auto-filling to happen, even without the below patch.
 
You may want to use fill-nobreak-predicate variable instead, e.g. with
`org-at-property-p'.

I gave that a try, by tweaking fill-nobreak-predicate inside the org-setup-filling function. But that doesn't work. Looks like the predicate is evaluated *after* `newline' inserts the newline.. and so `org-at-property-p' would evaluate to nil.

** The patch **

Looking at the source code of `newline' defun, I came up with this and it works!

diff --git a/lisp/org.el b/lisp/org.el
index 688e48bcc1d..9367304e900 100644
--- a/lisp/org.el
+++ b/lisp/org.el
@@ -20471,7 +20471,10 @@ object (e.g., within a comment).  In these case, you need to use
          (delete-and-extract-region (point) (line-end-position))))
     (newline-and-indent)
     (save-excursion (insert trailing-data))))
-     (t (if indent (newline-and-indent) (newline))))))
+     (t (let ((auto-fill-function (if (org-at-property-p)
+                                      nil
+                                    auto-fill-function)))
+          (if indent (newline-and-indent) (newline)))))))
 
 (defun org-return-indent ()
   "Goto next table row or insert a newline and indent.


--

Kaushal Modi


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