Merge pull request #19 from mprihoda/wip/metals-config

Metals configuration enhancements

.gitignore

@@ -14,3 +14,6 @@ Cargo.lock
 *.pdb
 .DS_Store
 *.wasm
+
+# Ignore build-generated grammars folder
+grammars

README.md

@@ -28,3 +28,27 @@ as inlay hints:
   }
 }
 ```
+
+You can also set [Metals initialization options](https://scalameta.org/metals/docs/integrations/new-editor/#initializationoptions) and
+[Metals server properties](https://scalameta.org/metals/docs/integrations/new-editor#metals-server-properties) in your zed settings.json
+in `lsp.metals.binary.arguments` and `lsp.metals.initialization_options`, respectively.
+
+For example, to [enable HTTP server](https://scalameta.org/metals/docs/integrations/new-editor#metals-http-client) (running on http://localhost:5031 by default)
+for executing client commands, which currently are not supported by zed directly, you can use:
+
+``` json
+{
+  "lsp": {
+    "metals": {
+      "binary": {
+        "arguments": [
+          "-Dmetals.http=on"
+        ]
+      },
+      "initialization_options": {
+        "isHttpEnabled": true
+      }
+    }
+  }
+}
+```

extension.toml

@@ -16,4 +16,4 @@ language = "Scala"
 
 [grammars.scala]
 repository = "https://github.com/tree-sitter/tree-sitter-scala"
-commit = "45b5ba0e749a8477a8fd2666f082f352859bdc3c"
+commit = "d9017869dda79cefe2dc9d23c6125eda0a2d5d22"

src/lib.rs

@@ -16,13 +16,34 @@ impl zed::Extension for ScalaExtension {
             .which("metals")
             .ok_or_else(|| "Metals must be installed via coursier. Please install coursier (https://get-coursier.io/), and then run `cs install metals`.".to_string())?;
 
+        let arguments = LspSettings::for_worktree("metals", worktree)
+            .map(|lsp_settings| {
+                lsp_settings
+                    .binary
+                    .and_then(|binary| binary.arguments)
+                    // If no arguments are provided, default to enabling the HTTP server.
+                    .unwrap_or(vec!["-Dmetals.http=on".to_string()])
+            })
+            .unwrap_or_default();
+
         Ok(zed::Command {
             command: path,
-            args: vec![],
+            args: arguments,
             env: worktree.shell_env(),
         })
     }
 
+    fn language_server_initialization_options(
+        &mut self,
+        _language_server_id: &zed_extension_api::LanguageServerId,
+        worktree: &zed_extension_api::Worktree,
+    ) -> Result<Option<serde_json::Value>> {
+        let initialization_options = LspSettings::for_worktree("metals", worktree)
+            .map(|lsp_settings| lsp_settings.initialization_options.clone());
+
+        initialization_options
+    }
+
     fn language_server_workspace_configuration(
         &mut self,
         _language_server_id: &zed::LanguageServerId,