Thanks for an answer, in any place first :). Am Di., 6. Apr. 2021 um 05:46 Uhr schrieb Kyle Meyer : > [ Sorry for the slow reply. ] > > Simon Braß writes: > > > Hi all, > > > > I've tried to open an attached file (added with org-attach-attach), > however, > > when I try to open it with C-c C-o I got the following backtrace: > > > > #+begin_example > > Debugger entered--Lisp error: (wrong-number-of-arguments (2 . 2) 1) > > org-attach-follow("1805.00020.pdf") > > org-link-open((link (:type "attachment" :path "1805.00020.pdf" :format > > bracket :raw-link "attachment:1805.00020.pdf" :application nil > > :search-option nil :begin 717 :end 818 :contents-begin 746 :contents-end > > 816 :post-blank 0 :parent (paragraph (:begin 717 :end 819 :contents-begin > > 717 :contents-end 819 :post-blank 0 :post-affiliated 717 :parent (item > > (:bullet "- " :begin 708 :end 819 :contents-begin 717 :contents-end 819 > > :checkbox off :counter nil :structure (... ... ... ... ...) :pre-blank 0 > > :post-blank 0 :post-affiliated 708 :tag nil :parent (plain-list > ...))))))) > > nil) > > org-open-at-point(nil) > > funcall-interactively(org-open-at-point nil) > > call-interactively(org-open-at-point nil nil) > > command-execute(org-open-at-point) > > #+end_example > > Hmm, this looks like an inaccessible state for Org 9.4.4. Here's how > org-link-open would handle an attachment type: > > (let ((f (org-link-get-parameter type :follow))) > (when (functionp f) > ;; Function defined in `:follow' parameter may use a single > ;; argument, as it was mandatory before Org 9.4. This is > ;; deprecated, but support it for now. > (condition-case nil > (funcall (org-link-get-parameter type :follow) path arg) > (wrong-number-of-arguments > (funcall (org-link-get-parameter type :follow) path))))) > > So it first calls with the expected 2 arguments and then falls back to > the single one. > Thanks, good to know. I'm clearly not a Lisp expert... Follow attachment links works okay on my end, and, aside from a mixed > installation, I can't think of a way to get into that state. > > https://orgmode.org/worg/org-faq.html#mixed-install > > > After adding =&optional= to the definition of =org-attach-follow=, and > > reloading org-mode (uncompiled) I could get through org-attach-follow. > > But, then I hit another issue: > > > > #+begin_example > > Debugger entered--Lisp error: (void-function org-link-open-as-file) > > (org-link-open-as-file (org-attach-expand file) arg) > > org-attach-follow("0906.4487.pdf") > > … > > #+end_example > > That function was added in 9.4 and is in the same file as the caller, > org-link-open. The fact that it's not defined also points to a mixed > install, with an older ol.el taking precedence. > It seems to work with the recent Emacs version: GNU Emacs 27.2 (build 1, x86_64-pc-linux-gnu, GTK+ Version 3.24.27, cairo version 1.17.4) of 2021-03-26. So, it actually points to a mixed installation on my side. Next time I will follow the instructions in https://orgmode.org/manual/Feedback.html more carefully, and remind myself of a possible mixed installation. Thanks, again, Kyle for your answer. Cheers, Simon