Smaller text edits in lsp formatting handler (#1031)

* Reply with correct server information

* Compute more granular textedits for formatting requests

* Use byte diff instead of line diff

* Add missing range formatting capability

* Use correct package name

* Test exact edits returned by formatting handler

* Update CHANGELOG.md

* Add initialization option to respect editor's formatting options

Author: jrentlez

CHANGELOG.md

@@ -7,9 +7,20 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Added
+
+- The language server has an initialization option called `respect_editor_formatting_options`.
+  If it's true, the formatting handler will override the configurations `indent-width` and `indent-type` with values from [FormattingOptions](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#formattingOptions)
+
+### Changed
+
+- In language server mode, compute the difference between the unformatted and formatted document and only respond with the changes.
+- Include `serverInfo` in the language server's [`InitializeResponse`](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#initializeResult)
+
 ### Fixed
 
 - Fixed comments lost from expression after parentheses are removed when we are attempting to "hang" the expression. ([#1033](https://github.com/JohnnyMorganz/StyLua/issues/1033))
+- `document_range_formatting_provider` field missing from `ServerCapabilities`
 
 ## [2.2.0] - 2025-09-14
 

Cargo.lock

@@ -52,7 +52,7 @@ num_cpus = "1.16.0"
 regex = "1.10.2"
 serde = "1.0.188"
 serde_json = "1.0.108"
-similar = { version = "2.3.0", features = ["text", "inline", "serde"] }
+similar = { version = "2.3.0", features = ["text", "inline", "serde", "bytes"] }
 strum = { version = "0.25.0", features = ["derive"], optional = true }
 thiserror = "1.0.49"
 threadpool = "1.8.1"

Cargo.toml

@@ -253,6 +253,8 @@ StyLua can run as a language server, connecting with language clients that follo
 It will then respond to `textDocument/formatting` and `textDocument/rangeFormatting` requests.
 Formatting is only performed on files with a `lua` or `luau` language ID.
 
+If the initialization option `respect_editor_formatting_options` is set to `true`, the formatting handler will override the configurations `indent-width` and `indent-type` with values from [FormattingOptions](https://microsoft.github.io/language-server-protocol/specifications/lsp/3.17/specification/#formattingOptions).
+
 You can start the language server by running:
 
 ```sh