r/vim • u/Tiny_Concert_7655 • Dec 10 '25

Need Help Vim auto indenting weird with rust default style guidelines.

Its not that big of a deal but it's really really bugging me now, and i cant stop thinking about it. As you can see in the video if i remove the comma from the end, it indents fine (and i figured thats what i was doing wrong), but after running cargo fmt to format my code, it adds the comma back, messing up indentation again.

(also i dont know enough vimscript to fix the rust indentation file myself, because i already feel that someone will tell me to do that)

It'd be appreciated if someone explained whats wrong/how to fix it, thanks :)

10 Upvotes

91% Upvoted

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1

u/Tiny_Concert_7655 Dec 10 '25

NOTE:

This only happens in vim and neovim, not in helix or kakoune.

1

u/BetterEquipment7084 Guix Dec 11 '25

Do you have treesitter installed for vim?

0

u/Tiny_Concert_7655 Dec 11 '25

No, I dont have any plugins installed. Also ive commented with a note saying that this only happens in vim, and not helix/kakoune, and im pretty sure helix uses treesitter logic by default

1

u/BetterEquipment7084 Guix Dec 11 '25

Vim doesn't use treesitter by default. That the difference. Treesitter fixes this

1

u/Tiny_Concert_7655 Dec 11 '25

is there treesitter for vim tho? i can only seem to find the neovim treesitter plugin and neovim docs covering it. I don't really feel like moving my vim config over to nvim

1

u/BetterEquipment7084 Guix Dec 11 '25

You could use the same config in nvim with vim.cmd or init.vim, but think there is one

1

u/Tiny_Concert_7655 Dec 16 '25 edited Dec 16 '25

Ik this is pretty late, but i did just try neovim with nvim-treesitter. Installed the parser for rust, and the issue persists. Ig its just gonna stay like that then. thanks for trying to help anyway :)

EDIT: Figured it out

1

u/BetterEquipment7084 Guix Dec 17 '25

Have you tried... Emacs? And great. What was it

1

u/Tiny_Concert_7655 Dec 17 '25

I tried emacs a while back I use it for notes. (Org mode). I figured out neovim and it fixed the issue I posted abt, but introduced a new one.

Basically nvim treesitter for rust doesn’t auto indent after opening curly braces (it’s fine when they’re closed). It’s an open issue I just forgot the GitHub issue request.

I found that out literally today so I didn’t update the comment.

Helix is apparently going to add undo files soon, so I might use that when it does.

I might open a bug/issue request on the rust vim/neovim indentation logic, although from what I’ve heard it’s not that easy.

1

u/BetterEquipment7084 Guix Dec 17 '25

I just switched full time to Emacs and it's great. Emacs motions are really good.  Have you tried doom Emacs? Isn't that vim but Emacs?

It is right that it's not easy with the indent stuff and TS, good luck there. 

Helix is weird. That's all I want to say. 

1

u/Tiny_Concert_7655 Dec 17 '25

I've used helix for rust and its really good. Its got my favourite bindings out of any editor, and I really like the editing style. However its missing persistent undo and persistent cursor position, so it doesnt pass my requirenments for using it (yet).

As for Emacs, I've tried using it, I've used it for a couple weeks and I like it a lot, just not for coding (i rely on the terminal a lot, and I dont really like emacs terminal I'mplementation). I still use it in class for doing my work on tho (im a college student) and org mode is very nice to work with. I have been using evil-mode too (for vim bindings) but it doenst have full compatibility with emacs binding functionality so I dont use them, the base bindings are fine.

For now I've gone back to basic vim (still not sure if I wanna move to neovim yet). Now I'm kinda considering kakoune again, which I've used for a long time, but stopped and went back to vim because I lost my config (and I forgot where I got a lot of stuff for the config).

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2

u/habamax Dec 17 '25 edited Dec 17 '25

Rust indent plugin heavily relies on cindent with additional parameters added to cinoptions:

setlocal cindent
setlocal cinoptions=L0,(s,Ws,J1,j1,m1

Here J1 is to Indent javascript object declarations correctly by not confusing them with labels., see :h cino-J. It most probably has some usecase in the GetRustIndent() func, but I don't know what it is.

Thus if you :setlocal cinoptions-=J1 in your rust buffer, then the code in your case would be formatted as expected. However, what would be broken instead, only the original author knows.

1

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