fix(lsp): apply .editorconfig options

CHANGELOG.md

@@ -23,6 +23,11 @@ our [guidelines for writing a good changelog entry](https://github.com/biomejs/b
 
 ### Editors
 
+#### Bug fixes
+
+- Fix [#3923](https://github.com/biomejs/biome/issues/3923). Now the `.editorconfig` is correctly parsed by the LSP, and the options are correctly applied to files when formatting is triggered.
+  Plus, the Biome LSP now watches for any change to the `.editorconfig`, and updates the formatting settings.
+
 ### Formatter
 
 ### JavaScript APIs

crates/biome_cli/src/commands/check.rs

@@ -96,15 +96,8 @@ pub(crate) fn check(
 
     let should_use_editorconfig = configuration
         .as_ref()
-        .and_then(|f| f.formatter.as_ref())
-        .and_then(|f| f.use_editorconfig)
-        .unwrap_or(
-            biome_configuration
-                .formatter
-                .as_ref()
-                .and_then(|f| f.use_editorconfig)
-                .unwrap_or_default(),
-        );
+        .and_then(|c| c.use_editorconfig())
+        .unwrap_or(biome_configuration.use_editorconfig().unwrap_or_default());
     let mut fs_configuration = if should_use_editorconfig {
         let (editorconfig, editorconfig_diagnostics) = {
             let search_path = editorconfig_search_path.unwrap_or_else(|| {

crates/biome_cli/src/commands/ci.rs

@@ -51,7 +51,6 @@ pub(crate) fn ci(session: CliSession, payload: CiCommandPayload) -> Result<(), C
         cli_options.verbose,
     )?;
 
-    let editorconfig_search_path = loaded_configuration.directory_path.clone();
     let LoadedConfiguration {
         configuration: biome_configuration,
         directory_path: configuration_path,
@@ -60,18 +59,11 @@ pub(crate) fn ci(session: CliSession, payload: CiCommandPayload) -> Result<(), C
 
     let should_use_editorconfig = configuration
         .as_ref()
-        .and_then(|c| c.formatter.as_ref())
-        .and_then(|f| f.use_editorconfig)
-        .unwrap_or(
-            biome_configuration
-                .formatter
-                .as_ref()
-                .and_then(|f| f.use_editorconfig)
-                .unwrap_or_default(),
-        );
+        .and_then(|c| c.use_editorconfig())
+        .unwrap_or(biome_configuration.use_editorconfig().unwrap_or_default());
     let mut fs_configuration = if should_use_editorconfig {
         let (editorconfig, editorconfig_diagnostics) = {
-            let search_path = editorconfig_search_path.unwrap_or_else(|| {
+            let search_path = configuration_path.clone().unwrap_or_else(|| {
                 let fs = &session.app.fs;
                 fs.working_directory().unwrap_or_default()
             });

crates/biome_cli/src/commands/format.rs

@@ -90,14 +90,8 @@ pub(crate) fn format(
 
     let should_use_editorconfig = formatter_configuration
         .as_ref()
-        .and_then(|f| f.use_editorconfig)
-        .unwrap_or(
-            biome_configuration
-                .formatter
-                .as_ref()
-                .and_then(|f| f.use_editorconfig)
-                .unwrap_or_default(),
-        );
+        .and_then(|c| c.use_editorconfig)
+        .unwrap_or(biome_configuration.use_editorconfig().unwrap_or_default());
     let mut fs_configuration = if should_use_editorconfig {
         let (editorconfig, editorconfig_diagnostics) = {
             let search_path = editorconfig_search_path.unwrap_or_else(|| {

crates/biome_configuration/src/lib.rs

@@ -311,6 +311,11 @@ impl PartialConfiguration {
     pub fn is_vcs_enabled(&self) -> bool {
         !self.is_vcs_disabled()
     }
+
+    /// Whether Biome should check for `.editorconfig` file
+    pub fn use_editorconfig(&self) -> Option<bool> {
+        self.formatter.as_ref().and_then(|f| f.use_editorconfig)
+    }
 }
 
 /// The configuration of the filesystem

crates/biome_lsp/Cargo.toml

@@ -18,6 +18,7 @@ anyhow              = { workspace = true }
 biome_analyze       = { workspace = true }
 biome_configuration = { workspace = true }
 biome_console       = { workspace = true }
+biome_deserialize   = { workspace = true }
 biome_diagnostics   = { workspace = true }
 biome_fs            = { workspace = true }
 biome_rowan         = { workspace = true }

crates/biome_lsp/src/server.rs

@@ -150,6 +150,13 @@ impl LSPServer {
                             )),
                             kind: Some(WatchKind::all()),
                         },
+                        FileSystemWatcher {
+                            glob_pattern: GlobPattern::String(format!(
+                                "{}/.editorconfig",
+                                base_path.display()
+                            )),
+                            kind: Some(WatchKind::all()),
+                        },
                         // TODO: Biome 2.0 remove it
                         FileSystemWatcher {
                             glob_pattern: GlobPattern::String(format!(
@@ -325,10 +332,11 @@ impl LanguageServer for LSPServer {
                     let base_path = self.session.base_path();
                     if let Some(base_path) = base_path {
                         let possible_rome_json = file_path.strip_prefix(&base_path);
-                        if let Ok(possible_rome_json) = possible_rome_json {
-                            if possible_rome_json.display().to_string() == ROME_JSON
+                        if let Ok(watched_file) = possible_rome_json {
+                            if watched_file.display().to_string() == ROME_JSON
                                 || ConfigName::file_names()
-                                    .contains(&&*possible_rome_json.display().to_string())
+                                    .contains(&&*watched_file.display().to_string())
+                                || watched_file.ends_with(".editorconfig")
                             {
                                 self.session.load_workspace_settings().await;
                                 self.session.load_manifest().await;

crates/biome_lsp/src/session.rs

@@ -8,10 +8,11 @@ use anyhow::Result;
 use biome_analyze::RuleCategoriesBuilder;
 use biome_configuration::ConfigurationPathHint;
 use biome_console::markup;
+use biome_deserialize::Merge;
 use biome_diagnostics::{DiagnosticExt, Error, PrintDescription};
 use biome_fs::{BiomePath, FileSystem};
 use biome_service::configuration::{
-    load_configuration, LoadedConfiguration, PartialConfigurationExt,
+    load_configuration, load_editorconfig, LoadedConfiguration, PartialConfigurationExt,
 };
 use biome_service::file_handlers::{AstroFileHandler, SvelteFileHandler, VueFileHandler};
 use biome_service::workspace::{
@@ -499,13 +500,43 @@ impl Session {
                     ConfigurationStatus::Error
                 } else {
                     let LoadedConfiguration {
-                        configuration,
+                        configuration: fs_configuration,
                         directory_path: configuration_path,
                         ..
                     } = loaded_configuration;
                     info!("Configuration loaded successfully from disk.");
                     info!("Update workspace settings.");
+
                     let fs = &self.fs;
+                    let should_use_editorconfig =
+                        fs_configuration.use_editorconfig().unwrap_or_default();
+                    let mut configuration = if should_use_editorconfig {
+                        let (editorconfig, editorconfig_diagnostics) = {
+                            let search_path = configuration_path
+                                .clone()
+                                .unwrap_or_else(|| fs.working_directory().unwrap_or_default());
+                            match load_editorconfig(fs, search_path) {
+                                Ok(result) => result,
+                                Err(error) => {
+                                    error!(
+                                        "Failed load the `.editorconfig` file. Reason: {}",
+                                        error
+                                    );
+                                    self.client.log_message(MessageType::ERROR, &error).await;
+                                    return ConfigurationStatus::Error;
+                                }
+                            }
+                        };
+                        for diagnostic in editorconfig_diagnostics {
+                            let message = PrintDescription(&diagnostic).to_string();
+                            self.client.log_message(MessageType::ERROR, message).await;
+                        }
+                        editorconfig.unwrap_or_default()
+                    } else {
+                        Default::default()
+                    };
+
+                    configuration.merge_with(fs_configuration);
 
                     let result =
                         configuration.retrieve_gitignore_matches(fs, configuration_path.as_deref());