Nim-mode breaks cider

[joswik]

My conf. is Emacs 24.5 with bbatsov/prelude (prelude-clojure enabled in prelude-modules.el).

When nim-mode is updated with and BEFORE cider, I get the following error with cider-jack-in:
cider-jack-in: Invalid function: (repl-buff (cider-find-reusable-repl-buffer nil project-dir))

After this cider is broken permanently, restarting Emacs doesn't help.

For example I had these packages to update a few days ago:
Install these 3 packages (nim-mode-20160418.18, magit-20160418.1513, cider-20160418.1513)? (y or n)

As far as I can see packages are installed in reverse (Z-to-A) order, so nim-mode is always installed before cider.
So my workaround is simply to unselect nim-mode, install everything else, then install nim-mode last.

I don't know if it is possible to change package install order.
So I wiped .emacs.d completely; then put in it the latest prelude with just default prelude-modules.el.
Now nim-mode and cider are not installed, so I select one by one from list-packages. This procedure was repeated before each test.

1. installed nim-mode first, and after it finished selected cider and installed that. Cider didn't work.
2. installed nim-mode first, and after install restarted Emacs, then selected cider and installed it. Now cider works OK.
3. installed cider first, didn't restart Emacs, then selected nim-mode and installed it. Cider works OK.

So the only case that breaks cider is installing nim-mode before cider in the SAME Emacs session.

(BTW, I'd like to have nim included in prelude-modules.el in the future.)

project.clj is empty i.e. default created with 'lein new app someapp'

And my profiles.clj is:

{:user {:plugins [[cider/cider-nrepl "0.13.0-snapshot"]]
        :dependencies [ [org.clojure/clojure "1.8.0"]
                       [org.clojure/tools.nrepl "0.2.12"]]}} 

Environment & Version information

CIDER 0.13.0snapshot (package: 20160423.2330), nREPL 0.2.12
Clojure 1.8.0, 1.8.0_66
Leiningen 2.6.1 on Java 1.8.0_66 Java HotSpot(TM) Client VM
Emacs 24.5
Windows 7 SP1 (32-bit)

[bbatsov]

So the only case that breaks cider is installing nim-mode before cider in the SAME Emacs session.

That's very odd. Figuring out what's wrong would probably require analyzing nim-mode's code and I doubt I'll have time for this (if it's really an issue there, that is).

(BTW, I'd like to have nim included in prelude-modules.el in the future.)

PR welcome! :-)

And my profiles.clj is:

If you're only using cider-jack-in, you can remove all this stuff from your profiles.clj.

[Malabarba]

The first step is to file an issue there politely asking if they know what might be happening. If nim-mode is doing something odd then they'll probably know what it is.

If that doesn't happen, then I can try to look over the code.

[joswik]

Thank you for your answers.
But before I file the issue to them, can someone confirm this behavior?
Does the same thing happen in Linux or Mac OS?

It's very easy to test - just install nim-mode from list-packages.
But-

1. make a backup of .emacs.d folder, because if it brekas you can't go back (I think)
2. to be able to test it, there have to be updates of both nim and cider at the same time.
   But if you already have the latest cider installed the problem won't show up.
   So the only way is clean .emacs.d with default prelude-modules without prelude-clojure enabled,
   and manually install first nim-mode and then cider without restarting Emacs.

[Malabarba]

No need. I've found the cause.