Format C/C++ automatically on save?

[766F6964]

I am working with a C codebase, and I have clangd installed - the autocompletion works just fine.
However, it seems that formatting doesn't, at least no the way I would like it to.

I have a language.toml file, that looks like this:

[[language]]
name = "c"
scope = "source.c"
injection-regex = "c"
file-types = ["c"]
comment-token = "//"
block-comment-tokens = { start = "/*", end = "*/" }
language-servers = [ "clangd" ]
indent = { tab-width = 4, unit = " " }

I always want the indentation to be 4 spaces in my code - ideally automatically whenever I save.
As of now, it doesn't. The indentation stays at 2 spaces (which I believe is the default of helix).
Running :format manually also doesn't change the indentation to 4 spaces - am I missing something?

EDIT: It seems like the configuration doesn't have any affect at all? Changing the unit to e.g. two spaces also doesn't change anything?

[kirawi]

The file is languages.toml not language.toml

clangd will also automatically default to 2 (see #8426) and Helix will automatically use the indentation from formatting.

[766F6964]

That was just a typo in my post here, the file is infact named languages.toml.
It also seems that the formatting only applies to new code being written, but it does not seem to reformat existing code?

So, bsaed on the issue you linked, it seems there is on way to reformat all the existing code?

[kirawi]

You need to configure clangd. The config is in one of the comments in that issue.

[766F6964]

I am not sure which config you are referring to exactly.
I see this one: language-server = { command = "clangd", args = ['--fallback-style=Webkit'] } - which I already specified in my languages.toml

My languages.toml now looks like this:

[[language]]
name = "c"
scope = "source.c"
file-types = ["c"]
comment-token = "//"
language-server = { command = "clangd", args = ['--fallback-style=Webkit'] }
indent = { tab-width = 4, unit = "    " }
auto-format = true

But it does not seem to be valid, at least helix does not want to accept it? Starting helix with this config present, results in this error message:

Bad language config: unknown field `language-server`, expected one of `name`, `language-id`, `scope`, `file-types`, `shebangs`, `roots`, `comment-token`, `text-width`, `soft-wrap`, `auto-format`, `formatter`, `diagnostic-severity`, `grammar`, `injection-regex`, `language-servers`, `indent`, `debugger`, `auto-pairs`, `rulers`, `workspace-lsp-roots`, `persistent-diagnostic-sources`
in `language`

Press <ENTER> to continue with default language config

Did the syntax for specifying the language server change? There is a field named language-servers (plural), but I am not sure how I would assign that?

I tried the following, but that didn't work: language-servers = [{ command = "clangd", args = ['--fallback-style=Webkit'] }]

[kirawi]

Yes, it changed with 23.10.

It's

[language-server.clangd]
args = [ ... ]