[-- Attachment #1: Type: text/plain, Size: 1456 bytes --] Hello, I, an Emacs Lisp newbie, want to get a list of all top-level headings of the current buffer. My approach so far is: (defun test-org-map() (interactive) (setq headings '()) (org-map-entries (lambda () (setq current-header-item (org-element-property :title (org-element-at-point)) (message "Header: %s" current-header-item) (message "Is String: %s" (stringp (org-element-property :title (org-element-at-point)))) (setq headings (append current-header-item headings)) ) "LEVEL=1" ) (dolist (heading headings) (message "Header Item: %s" heading) ) ) This gives the otput: Header: AAA Is String: t Header: BBB Is String: t Header Item: 66 [3 times] Header Item: 65 [3 times] so basically the (org-element-property :title (org-element-at-point) does exactly what I want, but building the list does not what I want. I suppose that comes from a fundamental misunderstanding of how strings work in elisp. I would appreciate a short explanation (or pointers) why this does not work. And of course, I am very open to completely different, likely better, approches to that simply problem! Thanks, Florian [-- Attachment #2: Type: text/html, Size: 2199 bytes --]
[-- Attachment #1: Type: text/plain, Size: 1983 bytes --] I think this is all you need to get a list of titles of level 1 headings as strings (org-map-entries (lambda () (fifth (org-heading-components))) "LEVEL=1") this also works for me: #+BEGIN_SRC emacs-lisp (org-map-entries (lambda () (org-element-property :title (org-element-at-point)) ) "LEVEL=1") #+END_SRC John ----------------------------------- Professor John Kitchin (he/him/his) Doherty Hall A207F Department of Chemical Engineering Carnegie Mellon University Pittsburgh, PA 15213 412-268-7803 @johnkitchin http://kitchingroup.cheme.cmu.edu On Wed, May 19, 2021 at 3:51 AM Florian Lindner <mailinglists@xgm.de> wrote: > Hello, > > I, an Emacs Lisp newbie, want to get a list of all top-level headings of > the current buffer. My approach so far is: > > (defun test-org-map() > (interactive) > (setq headings '()) > (org-map-entries (lambda () > (setq current-header-item (org-element-property > :title (org-element-at-point)) > (message "Header: %s" current-header-item) > (message "Is String: %s" (stringp > (org-element-property :title (org-element-at-point)))) > (setq headings (append current-header-item headings)) > ) > "LEVEL=1" > ) > (dolist (heading headings) > (message "Header Item: %s" heading) > ) > ) > > This gives the otput: > > Header: AAA > Is String: t > Header: BBB > Is String: t > Header Item: 66 [3 times] > Header Item: 65 [3 times] > > so basically the (org-element-property :title (org-element-at-point) does > exactly what I want, but building the list does not what I want. I suppose > that comes from a fundamental misunderstanding of how strings work in elisp. > > I would appreciate a short explanation (or pointers) why this does not > work. And of course, I am very open to completely different, likely better, > approches to that simply problem! > > Thanks, > Florian > [-- Attachment #2: Type: text/html, Size: 2919 bytes --]
Hello Florian
On 19 May 2021, Florian Lindner wrote:
> Hello,
>
> I, an Emacs Lisp newbie, want to get a list of all top-level
> headings
> of the current buffer. My approach so far is:
>
> (defun test-org-map()
> (interactive)
> (setq headings '())
> (org-map-entries (lambda ()
> (setq current-header-item
> (org-element-property :
> title (org-element-at-point))
> (message "Header: %s" current-header-item)
> (message "Is String: %s" (stringp
> (org-element-property :title (org-element-at-point))))
> (setq headings (append current-header-item
> headings))
> )
> "LEVEL=1"
> )
> (dolist (heading headings)
> (message "Header Item: %s" heading)
> )
> )
>
> This gives the otput:
>
> Header: AAA
> Is String: t
> Header: BBB
> Is String: t
> Header Item: 66 [3 times]
> Header Item: 65 [3 times]
>
> so basically the (org-element-property :title
> (org-element-at-point)
> does exactly what I want, but building the list does not what I
> want.
> I suppose that comes from a fundamental misunderstanding of how
> strings work in elisp.
>
> I would appreciate a short explanation (or pointers) why this
> does not
> work. And of course, I am very open to completely different,
> likely
> better, approches to that simply problem!
>
> Thanks,
> Florian
The org-map-entries function calls FUNC at each headline, so you
have to (1) find the headline/title and (2) add it to your list.
One way to do this is with the push macro.
--8<---------------cut here---------------start------------->8---
(defun test-org-map ()
(interactive)
(let (headlines)
(org-map-entries
(lambda ()
(let* ((element (org-element-at-point))
(headline (org-element-property :title element)))
(push headline headlines)))
"LEVEL=1")
(print (nreverse headlines))))
--8<---------------cut here---------------end--------------->8---
Or by searching the buffer:
--8<---------------cut here---------------start------------->8---
(defun test-org-map ()
(interactive)
(let (headlines)
(save-excursion
(goto-char (point-max))
(while (re-search-backward org-complex-heading-regexp nil t)
(let ((headline (match-string-no-properties 4)))
(when (= (org-current-level) 1)
(push headline headlines))))
(print headlines))))
--8<---------------cut here---------------end--------------->8---
BTW you're missing a closing parenthesis in:
(setq current-header-item (org-element-property :title
(org-element-at-point)))
Maybe that's why you're getting errors.
--
Jonathan
Hi
On 19 May 2021, John Kitchin wrote:
> I think this is all you need to get a list of titles of level 1
> headings as strings
>
> (org-map-entries (lambda () (fifth (org-heading-components)))
> "LEVEL=1")
>
> this also works for me:
>
> #+BEGIN_SRC emacs-lisp
> (org-map-entries (lambda () (org-element-property :title
> (org-element-at-point)) ) "LEVEL=1")
> #+END_SRC
This is a better approach indeed. No need to create a new list,
although I get faster results using:
(while (re-search-backward org-complex-heading-regexp nil t)
--
Jonathan
[-- Attachment #1: Type: text/plain, Size: 1525 bytes --] that is often true, especially with large buffers, but you have to add a bunch of code to go to point-max, and check the level with this. #+BEGIN_SRC emacs-lisp (save-excursion (goto-char (point-max)) (let (components (headings '())) (while (re-search-backward org-complex-heading-regexp nil t) (setq components (org-heading-components)) (when (= (first components) 1) (push (fifth components) headings))) headings)) #+END_SRC This takes about 0.04 ms on a small example. The org-map-entries approach takes 0.6ms on the same example. In a big buffer that might be noticeable! John ----------------------------------- Professor John Kitchin (he/him/his) Doherty Hall A207F Department of Chemical Engineering Carnegie Mellon University Pittsburgh, PA 15213 412-268-7803 @johnkitchin http://kitchingroup.cheme.cmu.edu On Wed, May 19, 2021 at 10:19 AM Jonathan Gregory <jgrg@autistici.org> wrote: > Hi > > On 19 May 2021, John Kitchin wrote: > > > I think this is all you need to get a list of titles of level 1 > > headings as strings > > > > (org-map-entries (lambda () (fifth (org-heading-components))) > > "LEVEL=1") > > > > this also works for me: > > > > #+BEGIN_SRC emacs-lisp > > (org-map-entries (lambda () (org-element-property :title > > (org-element-at-point)) ) "LEVEL=1") > > #+END_SRC > > This is a better approach indeed. No need to create a new list, > although I get faster results using: > > (while (re-search-backward org-complex-heading-regexp nil t) > > > -- > Jonathan > > [-- Attachment #2: Type: text/html, Size: 2336 bytes --]