Added option to provide a custom config file to the lsp. (#460)

* Added option to provide a custom config file to the lsp.

* Simplified lsp loading routine with anyhow

* Moved config to language.toml

* Fixed test case

* Cargo fmt

* Revert now-useless changes

* Renamed custom_config to config

Co-authored-by: Cor <prive@corpeters.nl>

5 files changed, 26 insertions, 2 deletions

diff --git a/helix-core/src/indent.rs b/helix-core/src/indent.rs
index 1b36db7b..292ade4b 100644
--- a/helix-core/src/indent.rs
+++ b/helix-core/src/indent.rs
@@ -262,6 +262,7 @@ where
                 file_types: vec!["rs".to_string()],
                 language_id: "Rust".to_string(),
                 highlight_config: OnceCell::new(),
+                config: None,
                 //
                 roots: vec![],
                 auto_format: false,
diff --git a/helix-core/src/syntax.rs b/helix-core/src/syntax.rs
index f249f5fe..621cd046 100644
--- a/helix-core/src/syntax.rs
+++ b/helix-core/src/syntax.rs
@@ -35,6 +35,7 @@ pub struct LanguageConfiguration {
     pub scope: String,           // source.rust
     pub file_types: Vec<String>, // filename ends_with? <Gemfile, rb, etc>
     pub roots: Vec<String>,      // these indicate project roots <.git, Cargo.toml>
+    pub config: Option<String>,
 
     #[serde(default)]
     pub auto_format: bool,
diff --git a/helix-lsp/src/client.rs b/helix-lsp/src/client.rs
index 7f136fe8..1c2a49b5 100644
--- a/helix-lsp/src/client.rs
+++ b/helix-lsp/src/client.rs
@@ -24,12 +24,14 @@ pub struct Client {
     request_counter: AtomicU64,
     capabilities: Option<lsp::ServerCapabilities>,
     offset_encoding: OffsetEncoding,
+    config: Option<Value>,
 }
 
 impl Client {
     pub fn start(
         cmd: &str,
         args: &[String],
+        config: Option<Value>,
         id: usize,
     ) -> Result<(Self, UnboundedReceiver<(usize, Call)>)> {
         let process = Command::new(cmd)
@@ -57,6 +59,7 @@ impl Client {
             request_counter: AtomicU64::new(0),
             capabilities: None,
             offset_encoding: OffsetEncoding::Utf8,
+            config,
         };
 
         // TODO: async client.initialize()
@@ -214,13 +217,17 @@ impl Client {
         // TODO: delay any requests that are triggered prior to initialize
         let root = find_root(None).and_then(|root| lsp::Url::from_file_path(root).ok());
 
+        if self.config.is_some() {
+            log::info!("Using custom LSP config: {}", self.config.as_ref().unwrap());
+        }
+
         #[allow(deprecated)]
         let params = lsp::InitializeParams {
             process_id: Some(std::process::id()),
             // root_path is obsolete, use root_uri
             root_path: None,
             root_uri: root,
-            initialization_options: None,
+            initialization_options: self.config.clone(),
             capabilities: lsp::ClientCapabilities {
                 text_document: Some(lsp::TextDocumentClientCapabilities {
                     completion: Some(lsp::CompletionClientCapabilities {
diff --git a/helix-lsp/src/lib.rs b/helix-lsp/src/lib.rs
index 96a45bb9..72606b70 100644
--- a/helix-lsp/src/lib.rs
+++ b/helix-lsp/src/lib.rs
@@ -312,7 +312,12 @@ impl Registry {
                 Entry::Vacant(entry) => {
                     // initialize a new client
                     let id = self.counter.fetch_add(1, Ordering::Relaxed);
-                    let (mut client, incoming) = Client::start(&config.command, &config.args, id)?;
+                    let (mut client, incoming) = Client::start(
+                        &config.command,
+                        &config.args,
+                        serde_json::from_str(language_config.config.as_deref().unwrap_or("")).ok(),
+                        id,
+                    )?;
                     // TODO: run this async without blocking
                     futures_executor::block_on(client.initialize())?;
                     s_incoming.push(UnboundedReceiverStream::new(incoming));
diff --git a/languages.toml b/languages.toml
index 204a5987..ee495635 100644
--- a/languages.toml
+++ b/languages.toml
@@ -5,6 +5,16 @@ injection-regex = "rust"
 file-types = ["rs"]
 roots = []
 auto-format = true
+config = """
+{
+  "cargo": {
+    "loadOutDirsFromCheck": true
+  },
+  "procMacro": {
+    "enable": false
+  }
+}
+"""
 
 language-server = { command = "rust-analyzer" }
 indent = { tab-width = 4, unit = "    " }