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Re: [O] creating new #+KEYWORD: variables


From: Matt Price
Subject: Re: [O] creating new #+KEYWORD: variables
Date: Thu, 15 Nov 2018 07:15:16 -0500



On Sat, Nov 10, 2018 at 1:58 PM Nicolas Goaziou <address@hidden> wrote:
Hello,

John Kitchin <address@hidden> 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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