support the workspace/configuration request

Author: euclio

src/language_server_protocol.rs

@@ -23,8 +23,8 @@ use lsp_types::{
     CodeAction, CodeActionCapability, CodeActionContext, CodeActionKind,
     CodeActionKindLiteralSupport, CodeActionLiteralSupport, CodeActionOrCommand, CodeActionParams,
     CodeActionResponse, CodeLens, Command, CompletionCapability, CompletionItem,
-    CompletionItemCapability, CompletionResponse, CompletionTextEdit, Diagnostic,
-    DiagnosticSeverity, DidChangeConfigurationParams, DidChangeTextDocumentParams,
+    CompletionItemCapability, CompletionResponse, CompletionTextEdit, ConfigurationParams,
+    Diagnostic, DiagnosticSeverity, DidChangeConfigurationParams, DidChangeTextDocumentParams,
     DidChangeWatchedFilesParams, DidChangeWatchedFilesRegistrationOptions,
     DidCloseTextDocumentParams, DidOpenTextDocumentParams, DidSaveTextDocumentParams,
     DocumentChangeOperation, DocumentChanges, DocumentFormattingParams, DocumentHighlight,
@@ -1235,6 +1235,7 @@ impl LanguageClient {
                     }),
                     workspace: Some(WorkspaceClientCapabilities {
                         apply_edit: Some(true),
+                        configuration: Some(true),
                         did_change_watched_files: Some(GenericCapability {
                             dynamic_registration: Some(true),
                         }),
@@ -2018,6 +2019,27 @@ impl LanguageClient {
         Ok(())
     }
 
+    pub fn workspace_configuration(&self, params: &Value) -> Result<Value> {
+        let config_params = ConfigurationParams::deserialize(params)?;
+
+        let filename = self.vim()?.get_filename(&Value::Null)?;
+        let language_id = self.vim()?.get_language_id(&filename, &Value::Null)?;
+        let root = self.get(|state| state.roots.get(&language_id).cloned().unwrap_or_default())?;
+
+        let settings = self.get_workspace_settings(&root)?;
+
+        let configuration_items = config_params
+            .items
+            .into_iter()
+            .filter_map(|item| {
+                let section = format!("/{}", item.section?.replace(".", "/"));
+                settings.pointer(&section).cloned()
+            })
+            .collect::<Value>();
+
+        Ok(serde_json::to_value(&configuration_items)?)
+    }
+
     pub fn handle_code_lens_action(&self, params: &Value) -> Result<Value> {
         let filename = self.vim()?.get_filename(params)?;
         let line = self.vim()?.get_position(params)?.line;

src/rpchandler.rs

@@ -85,6 +85,7 @@ impl LanguageClient {
             request::Rename::METHOD => self.text_document_rename(&params),
             request::DocumentSymbolRequest::METHOD => self.text_document_document_symbol(&params),
             request::ShowMessageRequest::METHOD => self.window_show_message_request(&params),
+            request::WorkspaceConfiguration::METHOD => self.workspace_configuration(&params),
             request::WorkspaceSymbol::METHOD => self.workspace_symbol(&params),
             request::CodeActionRequest::METHOD => self.text_document_code_action(&params),
             request::Completion::METHOD => self.text_document_completion(&params),