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feat: format via alejandra when feature is set #89

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feat: format via alejandra when feature is set #89

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36 changes: 36 additions & 0 deletions Cargo.lock
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5 changes: 3 additions & 2 deletions Cargo.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -20,10 +20,11 @@ log = "0.4.17"
lsp-server = "0.6.0"
lsp-types = { version = "0.93.0", features = ["proposed"] }
regex = "1.5.6"
alejandra = { version = "1.5.0", optional = true }
rnix = "0.10.2"
serde = "1.0.138"
serde_json = "1.0.82"
nixpkgs-fmt-rnix = "1.2.0"
nixpkgs-fmt-rnix = { version = "1.2.0", optional = true }

[dev-dependencies]
stoppable_thread = "0.2.1"
Expand All @@ -32,7 +33,7 @@ maplit = "1"
[features]

# Set this to ["verbose"] when debugging
default = []
default = [ "nixpkgs-fmt-rnix" ]

# Enable showing internal errors via editor UI, such as via hover popups.
# This can be helpful for debugging, but we don't want the evaluator to
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42 changes: 33 additions & 9 deletions src/main.rs
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Expand Up @@ -209,16 +209,40 @@ impl App {
let document_links = self.document_links(&params).unwrap_or_default();
self.reply(Response::new_ok(id, document_links));
} else if let Some((id, params)) = cast::<Formatting>(&mut req) {
let changes = if let Some((ast, code, _)) = self.files.get(&params.text_document.uri) {
let fmt = nixpkgs_fmt::reformat_node(&ast.node());
vec![TextEdit {
range: utils::range(&code, TextRange::up_to(ast.node().text().len())),
new_text: fmt.text().to_string(),
}]
if let Some((ast, code, _)) = self.files.get(&params.text_document.uri) {
let node = ast.node();
let range = utils::range(&code, TextRange::up_to(node.text().len()));
if cfg!(feature = "alejandra") {
#[cfg(feature = "alejandra")]
match alejandra::format::in_memory(
params.text_document.uri.to_string(),
code.to_string(),
) {
(alejandra::format::Status::Changed(true), new_text) => {
self.reply(Response::new_ok(id, vec![TextEdit { range, new_text }]))
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We're implementing "partial" edits in #87 for nixpkgs-fmt, i.e. only the actual diffs, but not the reformatted file is returned.
AFAIU this also returns the entire file.

If we add a new formatter we should do it properly from the beginning, i.e. only return diffs. Otherwise it might be painful in the editor if e.g. all-packages.nix is attempted to be reformatted.

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I believe that would require changes in alejandra to support this in the first place.
@kamadorueda https://github.com/kamadorueda/alejandra/blob/c685879cda91934f29f42574b8eb367496b09df1/src/alejandra/src/format.rs#L13-L40 is the only functionality I found for formatting text in-memory, is there something else I am not aware of?
If such functionality does not exist:

  1. would you be open to having that feature implemented in the first place?
  2. how difficult do you think it would be to implement?
  3. do you have the capacity and willing to do this and if not, would you be open to a PR?

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@rvolosatovs alejandra::format::in_memory is all we have

I understand why sending small TextEdits instead of a TextEdit with the whole file can be a good thing. The most simple approach I can think of is:

  • Use alejandra::format::in_memory to get a string with the formatted text
  • Use a diffing library to see which lines are equal in the input text and in the formatted text
  • Emit TextEdits for the ranges that are different

I'm not sure if that is good enough for this use case, I'm not familiar with LSP

would you be open to having that feature implemented in the first place?

That feature is more related to this repository than to Alejandra, so it would be better to have it here and let Alejandra just focus on being good at formatting

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How much of a change would that be to Alejandra actually? The change in nixpkgs-fmt seemed rather trivial: nix-community/nixpkgs-fmt#296.

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@Ma27 Would it be possible to land this even without partial reformatting? I'm working on projects that use alejandra, and my workflow ends up: edit, :w, :!nix run nixpkgs\#alejandra -- %, test, edit, start again. Even without partial reformatting this change will make my workflow much better. Could it be done separately later?

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Not a maintainer of this anymore, so I don't have a strong opinion. Please discuss that with the current maintainers :)

}
(alejandra::format::Status::Changed(false), _) => {
self.reply(Response::new_ok(id, ()))
}
(alejandra::format::Status::Error(e), _) => {
self.reply(Response::new_err(id, ErrorCode::InternalError as i32, e))
}
}
} else if cfg!(feature = "nixpkgs-fmt-rnix") {
#[cfg(feature = "nixpkgs-fmt-rnix")]
self.reply(Response::new_ok(
id,
vec![TextEdit {
range,
new_text: nixpkgs_fmt::reformat_node(&node).text().to_string(),
}],
));
} else {
self.reply(Response::new_ok(id, ()))
}
} else {
Vec::new()
};
self.reply(Response::new_ok(id, changes));
self.reply(Response::new_ok(id, ()))
}
} else if let Some((id, params)) = cast::<HoverRequest>(&mut req) {
if let Some((range, markdown)) = self.hover(params) {
self.reply(Response::new_ok(
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