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>

2 files changed, 14 insertions, 2 deletions

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             // root_path is obsolete, use root_uri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));