Mechanism to catch and open exceptions from other threads in *cider-error* popup

[JosephFerano]

Is your feature request related to a problem? Please describe.

The cider error buffer is a great way to make Clojure's exceptions more ergonomic to read. However, if they are thrown from a different thread, such as when fiddling with UI in a JavaFx thread, then Cider is unable to catch them such that they raise the popup error buffer.

Describe the solution you'd like

Some sort of mechanism by which I can hook exceptions in other threads to trigger the cider error buffer popup.

Describe alternatives you've considered

Currently, I got it working, here's what i did;

First I used a workaround suggested in the slack;

(defonce last-exception (atom nil))

Then I assign a handler to Thread/setDefaultUncaughtExceptionHandler. Something along the lines of;

 (when (System/getProperty "cider-dev")
   (reset! last-exception exception)
   (log/error :message "EMACS-CIDER-REPORT-EXCEPTION"))

Then on the emacs side;

(defun joe/clojure-cider-throw-last-error ()
  (interactive)
  (cider-interactive-eval "\(throw @last-exception\)"))

(defun joe/cider-repl-preoutput-hook (output)
  (if (string-match "EMACS-CIDER-REPORT-EXCEPTION" output)
      (progn
        (joe/clojure-cider-throw-last-error)
        "")
    output))

(add-hook 'cider-repl-preoutput-hook #'joe/cider-repl-preoutput-hook)

The key being cider-repl-preoutput-hook

[github-actions]

This issue has been automatically marked as stale because it has not had any recent activity. It will be closed soon if no further activity occurs. Thank you for your contribution and understanding!

[alexander-yakushev]

Bad bot.

[github-actions]

This issue has been automatically marked as stale because it has not had any recent activity. It will be closed soon if no further activity occurs. Thank you for your contribution and understanding!