.exs file issue with Emacs 27, auto-composition-mode enabled

[jsmestad]

Background

I have been having issues with Emacs 27.x and opening config/*.exs files on my Elixir projects. It causes the editor to completely lock up where USR2 signals and C-g do nothing to remedy the situation.

Workaround

I came across this issue on spacemacs where ediff crashed with Fira Code or some other ligature-supported font (I am using Cascadia Code FYI).

UPDATE - I tried using a different font like Ubuntu Mono but experienced the same issue. So it does not appear to be ligature or font specific.

Running (global-auto-composition-mode -1) before opening the .exs file seems to stop the freezing that otherwise happens.

Unsure the cause

Maybe this is related to #445 and #446 but I cannot be sure.

[jsmestad]

Here is a snippet I use to access the config.exs files

(use-package elixir-mode
  :config
  (progn
    (defun exs-freeze-workaround ()
      (when (and (stringp buffer-file-name)
                 (string-match "\\.exs\\'" buffer-file-name))
        (auto-composition-mode -1)
        (elixir-mode)
        ))
    (add-hook 'elixir-mode-hook
              (if (version<= "27.0" emacs-version) (exs-freeze-workaround))
              (lambda () (add-hook 'before-save-hook 'lsp-format-buffer)))
    ))

[Trevoke]

Is this actually an issue with elixir-mode or is this an issue with emacs 27.x ?

…

On Mon, Nov 11, 2019 at 4:42 PM Justin Smestad ***@***.***> wrote: Here is a snippet I use to access the config.exs files (use-package elixir-mode :config (progn (defun exs-freeze-workaround () (when (and (stringp buffer-file-name) (string-match "\\.exs\\'" buffer-file-name)) (auto-composition-mode -1) (elixir-mode) )) (add-hook 'elixir-mode-hook (if (version<= "27.0" emacs-version) (exs-freeze-workaround)) (lambda () (add-hook 'before-save-hook 'lsp-format-buffer))) )) — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#447?email_source=notifications&email_token=AAAQSSJEZ4QVQHZHC4BZEZTQTHGVBA5CNFSM4JL3AFF2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOEDYHKWY#issuecomment-552629595>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAAQSSOQYUNQPVEZOFPUNT3QTHGVBANCNFSM4JL3AFFQ> .

[jsmestad]

@Trevoke I am not 100% sure. I will continue to investigate, but I have only experienced this issue with elixir-mode and *.exs files.

Given the issue reported relating to regex using high cpu usage, I think it stands to reason it could be an issue with changes in Emacs 27.x and elixir-mode. Any thoughts?

[victorolinasc]

@jsmestad can you test again now that #448 is merged?

[jsmestad]

@victorolinasc it does not. Updated to latest MELPA and commented out my fix. Same stall as before.

[jsmestad]

I do not seem to be hitting this issue, but to be fair it I do not have ligature support enabled via composition-modeand I am now on Emacs 28.x.

Closing this issue for now, but if other folks hit the issue, we can re-open.