Helix formatting not working for rust.

[bp7968h]

Hi, I have setup helix and rust languages in the config which are listed below:

config.toml

theme = "autumn"

[editor]
line-number = "absolute"
mouse = false
text-width = 85

[editor.soft-wrap]
enable = true

[editor.statusline]
left = ["mode", "spinner", "read-only-indicator", "file-modification-indicator"]
center = ["file-name"]
right = ["diagnostics", "selections", "position", "file-encoding", "file-line-ending", "file-type"]
separator = "<->"
mode.normal = "NORMAL"
mode.insert = "INSERT"
mode.select = "VISUAL"

[editor.cursor-shape]
normal = "hidden"
insert = "bar"
select = "block"

[editor.file-picker]
hidden = true

[keys.normal.c]
r = ":sh cargo run 2>&1 || true"
c = ":sh cargo check 2>&1 || true"
b = ":sh cargo build 2>&1 || true"
t = ":sh cargo test 2>&1 || true"

languages.toml

[[language]]
name = "rust"
scope = "source.rust"
injection-regex = "rs|rust"
file-types = ["rs"]
roots = ["Cargo.toml", "Cargo.lock"]
shebangs = ["rust-script", "cargo"]
auto-format = true
comment-tokens = ["//", "///", "//!"]
block-comment-tokens = [
  { start = "/*", end = "*/" },
  { start = "/**", end = "*/" },
  { start = "/*!", end = "*/" },
]
language-servers = [ "rust-analyzer" ]
formatter = { command = "rustfmt" }
indent = { tab-width = 4, unit = "    " }
persistent-diagnostic-sources = ["rustc", "clippy"]

[language-server.rust-analyzer]
command = "rust-analyzer"

[language-server.rust-analyzer.config]
inlayHints.bindingModeHints.enable = false
inlayHints.closingBraceHints.minLines = 10
inlayHints.closureReturnTypeHints.enable = "with_block"
inlayHints.discriminantHints.enable = "fieldless"
inlayHints.lifetimeElisionHints.enable = "skip_trivial"
inlayHints.typeHints.hideClosureInitialization = false

[language-server.rust-analyzer.config.check]
command = "clippy"

[[grammar]]
name = "rust"
source = { git = "https://github.com/tree-sitter/tree-sitter-rust", rev = "9c84af007b0f144954adb26b3f336495cbb320a7" }

When I same my file with :w, :write or even when I use :format , my files are not being formatted. Am I missing something, thank you for your help.

Kind Regards,
Bhuwan

[kirawi]

You don't need to define a formatter. rust-analyzer runs it for you. But if you want to add a formatter for any language, the command needs to take stdin and output the formatted text via stdout. You should also check if you are able to run rustfmt

[EmrysMyrddin]

With the default configuration, the rust-analyzer lsp doesn't seem to expose formatting capabilities:

Configured language servers:
  ✓ rust-analyzer: /Users/valentin/.cargo/bin/rust-analyzer
Configured debug adapter: lldb-dap
Binary for debug adapter: /opt/homebrew/opt/llvm/bin/lldb-dap
Configured formatter: None
Tree-sitter parser: ✓
Highlight queries: ✓
Textobject queries: ✓
Indent queries: ✓

So, to have automatic formatting, you definitly need to configure the formatter properly (not sure why it is not configured by default)