I’m using that too, but I can’t make elixir code inside html/heex be correct displayed (with syntax highlighting). Did you figured a way to fix that?
sezaru
alexpls
If you are getting some warning like “lsp is scanning 5000 files in current project…consider adding to ignore list”, try adding this to
config.el
A bunch of these directories are now ignored by default.
In my case, adding the following to my config.el was enough to get rid of the warning:
; Elixir: Ignore files which don't need to be watched
; https://emacs-lsp.github.io/lsp-mode/page/file-watchers/
(after! lsp-mode
(dolist (match
'("[/\\\\]_build\\'"
"[/\\\\]deps\\'"))
(add-to-list 'lsp-file-watch-ignored-directories match)))
3
cevado
can you send a snippet on how you did it on your config.el?
i’ve tried that and everytime i opened a new project it errored with no language registered for elixir-ts-mode or something like that. 
0
katafrakt
I just added that line. But there’s also a step from elixir-ts-mode readme, you should run M-x elixir-ts-install-grammar to, well, install the grammar. Maybe that’s what you are missing?
1
slouchpie
I started using emacs version 30 with doom today.
I had the same problem reported above about the “tree-sitter missing language grammar”.
To fix it I pressed Alt + X (called M-x in emacs land) and typed “treesit-ins” to find command treesit-install-language-grammar.
Then I typed elixir and press enter. It said something like “I don’t know what you’re talking about, do you want to do this together, interactively?”. So I said “yes” by typing y and pressing enter.
First of all it wants a github URL. So I google “treesitter elixir language grammar github” and the first result is https://github.com/elixir-lang/tree-sitter-elixir. I paste this in and press enter, then just accept the default answers for everything else. Then tree-sitter just pulls the repo, compiles it and installs the grammar (I guess 
).
I thought I was done. I closed emacs and ran doom sync just for sanity. When I re-opened emacs, it complains now about missing heex language grammar.
The same process works again. This time the github URL is https://github.com/phoenixframework/tree-sitter-heex.
TL;DR To fix treesitter missing language grammar, M-x treesit-install-language-grammar, enter “elixir”, paste https://github.com/elixir-lang/tree-sitter-elixir and press Enter 6 or 7 times. Repeat but with “heex” and https://github.com/phoenixframework/tree-sitter-heex.
P.S. Emacs 30 is great. Faster, etc. but the main “win” for me is now strings with # symbol in heex templates do not mess up formatting of the rest of the buffer. This is a tiny thing but a huge win for my state of mind.
5
slouchpie
I need to correct something I said nearly 3 years ago. I talked about using “universal mode” to run mix test --failed in Doom Emacs. This does not work any more. However, there is a different way. Thanks to the legendary @aymanosman for this info:
The Doom Emacs ExUnit way now is:
press
control + c
and then press
,
This opens a cool window (called a “transient” window) where you can do a bunch of stuff.
Typing -, f sets the failed flag. Then typing a runs all tests (with that flag).
4
BartOtten
Provided by GitHub - ananthakumaran/exunit.el: Emacs ExUnit test runner · GitHub. See the repo readme for more information.
2
katafrakt
As a curiosity perhaps, I decided to run a small experiment recently. Since majority of elixir-mode is now provided by tree-sitter, I disabled Elixir layer completely in Doom, just copied relevant parts from it to my config.el. All I needed was this:
(after! projectile
(add-to-list 'projectile-project-root-files "mix.exs"))
(after! lsp-mode
(add-to-list 'lsp-file-watch-ignored-directories "[/\\\\]_build\\'"))
(after! highlight-numbers
(puthash 'elixir-mode
"\\_<-?[[:digit:]]+\\(?:_[[:digit:]]\\{3\\}\\)*\\_>"
highlight-numbers-modelist))
(use-package! flycheck-credo
:when (modulep! :checkers syntax -flymake)
:config (flycheck-credo-setup))
(use-package! exunit
:init
(map! :localleader
:map elixir-mode-map
:prefix ("t" . "test")
"a" #'exunit-verify-all
"r" #'exunit-rerun
"v" #'exunit-verify
"T" #'exunit-toggle-file-and-test
"t" #'exunit-toggle-file-and-test-other-window
"s" #'exunit-verify-single))
This was on top on my existing config setting up eglot with Lexical, configuring tree-sitter etc.
So far after few days I see no problems with it. It even feels a bit snappier, but that’s probably my bias. However I think it can only work in Emacs 29 and 30 (I’m using 30).
2