Re: Get list of top-level headings
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 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 > >
Re: Get list of top-level headings
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
Re: Get list of top-level headings
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
Re: Get list of top-level headings
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 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 >
Get list of top-level headings
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
