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Problem

In org-mode 9.6.6 when not in a LaTeX fragment, inserting \ and invoking completion-at-point produces a multitude of LaTeX completions.

Doing the same thing when in a LaTeX fragment, I would like the same completions to be available, but they are not.

What I have figured out so far

completion-at-point-functions contains (pcomplete-completions-at-point t), and the definition of completion-at-point is as follows:

(defun completion-at-point ()
  "Perform completion on the text around point.
The completion method is determined by `completion-at-point-functions'."
  (interactive)
  (let ((res (run-hook-wrapped 'completion-at-point-functions
                               #'completion--capf-wrapper 'all)))
    (pcase res
      (`(,_ . ,(and (pred functionp) f)) (funcall f))
      (`(,hookfun . (,start ,end ,collection . ,plist))
       (unless (markerp start) (setq start (copy-marker start)))
       (let* ((completion-extra-properties plist)
              (completion-in-region-mode-predicate
               (lambda ()
                 ;; We're still in the same completion field.
                 (let ((newstart (car-safe (funcall hookfun))))
                   (and newstart (= newstart start))))))
         (completion-in-region start end collection
                               (plist-get plist :predicate))))
      ;; Maybe completion already happened and the function returned t.
      (_
       (when (cdr res)
         (message "Warning: %S failed to return valid completion data!"
                  (car res)))
       (cdr res)))))

When not in a LaTeX fragment, res is being bound to the same value as the result of (pcomplete-completions-at-point); when in a LaTeX fragment, res is bound to nil, even though (pcomplete-completions-at-point) returns the same value as before.

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  • I can not reproduce it here. Are you sure you are trying to complete equal 'patterns'? If so, could you add examples? Feb 6 at 21:39
  • 1
    It works in a \begin{math}...\end{math} environment, but not in $...$ or \(...\) or \[...\]. If I run completion-at-point with point immediately after the second of the three backslashes in the following text: \(\\), it says No Match. If I do it like this \( \ \) it says cl--assertion-failed: Assertion failed: (<= start (point)). This is all done in /tmp/x.org after emacs -Q while using emacs-mac
    – user615536
    Feb 7 at 0:53
  • 1
    Please report your findings with M-x org-submit-bug-report. I can reproduce the assertion failures. You should also add the Org mode version you are using to your question.
    – NickD
    Feb 7 at 1:46

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