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Org mode has completion for all keywords via pcomplete, as noted by Andrew Swann.
However, Company does not seem to pick up on these keywords. Calling company-complete on the following, where | represents point, brings up a list of English vocabulary words instead of Org keywords:
#+|
Is it possible for Company to do Org-specific completion in addition to the helpful textual completion that it normally does?
company-mode has company-capf. So the easiest way is adding pcomplete-completions-at-point to completion-at-point-functions:
(defun my-org-mode-hook ()
(add-hook 'completion-at-point-functions 'pcomplete-completions-at-point nil t))
(add-hook 'org-mode-hook #'my-org-mode-hook)
Make sure company-capf is in the list of company-backends.
#+ is not considered for the completion, so I still have to type at least 3 letters for Company to complete (this is likely customizable, but 3's a good number in most cases for performance). So instead of #+NAMES: I can type #+NAM and save 3 letters.
Mar 23, 2016 at 4:27
control+tab) for company-complete. In that case, you can type control+tab after "#+" and company should be able to give all possible completions. You can also write a simple company backend that recognizes the "^#+" as the prefix in order to begin completion.
Mar 23, 2016 at 5:14
Inspired by a comment from @cutejumper, I went ahead and wrote a simple company backend that recognizes the ^#+ prefix to start using pcomplete.
(defun org-keyword-backend (command &optional arg &rest ignored)
(interactive (list 'interactive))
(cl-case command
(interactive (company-begin-backend 'org-keyword-backend))
(prefix (and (eq major-mode 'org-mode)
(cons (company-grab-line "^#\\+\\(\\w*\\)" 1)
t)))
(candidates (mapcar #'upcase
(cl-remove-if-not
(lambda (c) (string-prefix-p arg c))
(pcomplete-completions))))
(ignore-case t)
(duplicates t)))
Use it with (add-to-list 'company-backends 'org-keyword-backend)
If you want it to wait a certain number of characters into the keyword before offering completion, change line 7 from t to the number you want.
If you want it to wait according to company-minimum-prefix-length, change lines 6 / 7 from (cons (company-grab-line ...) t) to just (company-grab-line ...).
After trying the accepted solution a while back (which ended up not working for me) and then giving up after about 6 months, I went back and found a simple solution.
(defun trigger-org-company-complete ()
"Begins company-complete in org-mode buffer after pressing #+ chars."
(interactive)
(if (string-equal "#" (string (preceding-char)))
(progn
(insert "+")
(company-complete))
(insert "+")))
(eval-after-load 'org '(define-key org-mode-map
(kbd "+") 'trigger-org-company-complete))
While this is certainly hacky, it's been working well for me, and it didn't require doing any complex parsing.
This works by only calling the function when the + character is entered in an org-mode buffer. Then, trigger-org-company-complete checks the preceding character, and if it's a # character, the + character is inserted and company-complete is called. If the previous character is not #, the + is only inserted, and everything behaves as normal.
You can see the behavior below. When just entering the # character, nothing happens. When # precedes a +, company-complete is triggered, and when just a + character is entered, nothing happens.
(I zoomed in a lot, which is why it's distorted)
