From 7ccef1dd89fdb8f530f7009a0477b09b15f841a6 Mon Sep 17 00:00:00 2001
From: Roman Cinis <52065414+tsinis@users.noreply.github.com>
Date: Wed, 25 Mar 2026 00:11:30 +0100
Subject: [PATCH] extension_api: Expose preferred_line_length in
 LanguageSettings (#52175)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

Closes #21822

## Context

Exposes `preferred_line_length` from `AllLanguageSettings` to the
Extension
API's `LanguageSettings` struct. Currently only `tab_size` is available
to
extensions, which prevents language extensions (e.g. Dart) from reading
the
user's preferred line length and forwarding it to their language server
(e.g. as `dart.lineLength`).

Related: https://github.com/zed-extensions/dart/issues/2

## How to Review

Small change — follow how `tab_size` is plumbed through:
1. WIT definition (`language-settings` record)
2. `extension_api` Rust struct
3. Host-side bridge conversion

The new field follows the exact same pattern.

## Self-Review Checklist

<!-- Check before requesting review: -->
- [x] I've reviewed my own diff for quality, security, and reliability
- [ ] Unsafe blocks (if any) have justifying comments
- [x] The content is consistent with the [UI/UX
checklist](https://github.com/zed-industries/zed/blob/main/CONTRIBUTING.md#uiux-checklist)
- [x] Tests cover the new/changed behavior
  - Compile-time verified via WIT bindings; no runtime behavior change
- [x] Performance impact has been considered and is acceptable

Release Notes:

- N/A
---
 crates/extension_api/src/settings.rs                    | 2 +-
 crates/extension_api/wit/since_v0.8.0/settings.rs       | 2 ++
 crates/extension_host/src/wasm_host/wit/since_v0_8_0.rs | 1 +
 3 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/crates/extension_api/src/settings.rs b/crates/extension_api/src/settings.rs
index a133a8027a4361c1f92e3fdecc73664497b4e6d6..bb9f2e20b23efd077e37b6c90b245f120c1d6ab9 100644
--- a/crates/extension_api/src/settings.rs
+++ b/crates/extension_api/src/settings.rs
@@ -1,6 +1,6 @@
 //! Provides access to Zed settings.
 
-#[path = "../wit/since_v0.2.0/settings.rs"]
+#[path = "../wit/since_v0.8.0/settings.rs"]
 mod types;
 
 use crate::{Project, Result, SettingsLocation, Worktree, wit};
diff --git a/crates/extension_api/wit/since_v0.8.0/settings.rs b/crates/extension_api/wit/since_v0.8.0/settings.rs
index 19e28c1ba955a998fe7b97f3eacb57c4b1104154..7c77dc79baf7ab89bec74b6c66ea5b736d2ba858 100644
--- a/crates/extension_api/wit/since_v0.8.0/settings.rs
+++ b/crates/extension_api/wit/since_v0.8.0/settings.rs
@@ -6,6 +6,8 @@ use std::{collections::HashMap, num::NonZeroU32};
 pub struct LanguageSettings {
     /// How many columns a tab should occupy.
     pub tab_size: NonZeroU32,
+    /// The preferred line length (column at which to wrap).
+    pub preferred_line_length: u32,
 }
 
 /// The settings for a particular language server.
diff --git a/crates/extension_host/src/wasm_host/wit/since_v0_8_0.rs b/crates/extension_host/src/wasm_host/wit/since_v0_8_0.rs
index d7cf29ad0a3fcc7448d5bf44a8a2612d55e07a88..324a572f40c98037816870c99151a4789793da1b 100644
--- a/crates/extension_host/src/wasm_host/wit/since_v0_8_0.rs
+++ b/crates/extension_host/src/wasm_host/wit/since_v0_8_0.rs
@@ -941,6 +941,7 @@ impl ExtensionImports for WasmState {
                         );
                         Ok(serde_json::to_string(&settings::LanguageSettings {
                             tab_size: settings.tab_size,
+                            preferred_line_length: settings.preferred_line_length,
                         })?)
                     }
                     "lsp" => {