Re: creating new #+KEYWORD: variables

[Matt Price <moptop99@gmail.com>]

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On Sat, Nov 10, 2018 at 1:58 PM Nicolas Goaziou <mail@nicolasgoaziou.fr>
wrote:

> Hello,
>
> John Kitchin <jkitchin@andrew.cmu.edu> writes:
>
> > You can retrieve keywords in the org-file like this:
> >
> > (defun get-keyword (key)
> >   (org-element-map (org-element-parse-buffer) 'keyword
> >     (lambda (k)
> >       (when (string= key (org-element-property :key k))
> > (org-element-property :value k)))
> >     nil t))
>
> As a minor addendum,
>
>     (org-element-parse-buffer 'element)
>
> is more efficient in this case.
>
> An even more efficient way to retrieve keywords, assuming buffer is not
> already parsed, would be:
>
>     (org-with-point-at 1
>       (let ((case-fold-search t)
>             (regexp (format "^[ \t]*#\\+%s:" key))
>             (result nil))
>         (while (re-search-forward regexp nil t)
>           (let ((element (org-element-at-point)))
>             (when (eq 'keyword (org-element-type element))
>               (push (org-element-property :value element) result))))
>         result))
>
> This is very helpful, Nicolas and John.

What about *setting* a global keyword? I would like to write something like
this:

(defun org-lms-set-global-prop-value (key value)
  "Add or update keyword KEY in the org file header."
  (save-excursion
    (goto-char (point-min))
    (insert (format "#+%s: %" (upcase key) value))))

But
(a) insert the value at the *end* of the headers section, not the
beginning.
(b) preferably replace any existing values of the keyword rather than write
a whole new line.

(b) I guess could be achieved with something like

(replace-regexp (format "\(^[ \t]*#\\+%s: \)\(.*\)" key) (concat "\1"
value))
But what about (a)? I thought org already had a couple of functions that
performed this kind of serach but now I'm not so sure.




> Regards,
>
> --
> Nicolas Goaziou
>

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