What should the languages.toml configuration file look like for Rust development?

[ArikRahman]

Newbie here, I have no idea where to start on how to start programming with Rust exclusively in Helix. When I cargo run a file, there is no debugging or auto-completion or anything. The only confirmation I have of the config file working is the auto-pairs. I'm not sure rust-analyzer is doing anything because nothing noticeable happened when I started programming with it. I installed the rust-analyzer Language Server Binary per instructions from their website so I'm sure everything is done correctly. My languages.toml config file looks like this:

[language.auto-pairs]
'(' = ')'
'{' = '}'
'[' = ']'
'"' = '"'
'' = ''

[[language]]
name = "rust"
scope = "source.rust"
injection-regex = "rust"
file-types = ["rs"]
roots = []
auto-format = true
comment-token = "//"
language-server = { command = "rust-analyzer" }
indent = { tab-width = 4, unit = " " }

[language.config]
cargo = { loadOutDirsFromCheck = true }
procMacro = { enable = false }
diagnostics = { disabled = ["unresolved-proc-macro"] }[[grammar]]
name = "rust"
source = { git = "https://github.com/tree-sitter/tree-sitter-rust", rev = "a360da0a29a19c281d08295a35ecd0544d2da211" }

[[grammar]]
name = "rust"
source = { git = "https://github.com/tree-sitter/tree-sitter-rust", rev = "a360da0a29a19c281d08295a35ecd0544d2da211" }

What am I missing or doing wrong?

[sbromberger]

Here's my languages.toml that's in my main configuration directory. It seems to work well for Rust. YMMV. You shouldn't have to edit anything in the runtime directory.

[[language]]
name="rust"
[language.config]
checkOnSave = {command = "clippy"}
cargo = {allFeatures = true}
procMacro = {enable = true }
auto-format = true

[cor]

This works very well. Thanks for sharing!

[David-Else]

I am not sure if it is working, I am 100% new to rust. The language server is running, but should this give on screen errors? It does get compiler error cannot find value x in this scope:

fn main() {
    x = 5;
    println!("x has the value {}", x);
}

I have

[[language]]
name="rust"
[language.config]
checkOnSave = {command = "clippy"}
cargo = {allFeatures = true}

How can I test if clippy is working too? Thanks!

(auto-format = true is inherited and not needed, works anyway)

[ArikRahman]

Thank you Mr. Bromberger. This unfortunately did not change much for me but I'll stick with Helix until I can understand the documentation better!

[ArikRahman]

OMG! That worked! In addition I had to type in the command ":set-language Rust". Rookie mistake from me. I'm just glad I figured it out so I can join y'all in the wonders of modal editing!

[sbromberger]

In addition I had to type in the command ":set-language Rust".

You shouldn't have to do this if you've created a Rust package using cargo init and are editing .rs files inside of src/.

[ArikRahman]

In addition I had to type in the command ":set-language Rust".

You shouldn't have to do this if you've created a Rust package using cargo init and are editing .rs files inside of src/.

Oh that makes sense. I used cargo new to initialize the project and I did that outside of Helix. I will keep that in mind for next time.

[sbromberger]

(@ArikRahman - suggest you mark this solved/closed.)

[Omnikar]

In addition I had to type in the command ":set-language Rust".

You shouldn't have to do this if you've created a Rust package using cargo init and are editing .rs files inside of src/.

Oh that makes sense. I used cargo new to initialize the project and I did that outside of Helix. I will keep that in mind for next time.

cargo init for an existing directory and cargo new for a new directory both work the same.