feat: support workspace folders configuration

cli/bench/fixtures/initialize_params.json

@@ -39,6 +39,10 @@
         "willSaveWaitUntil": true,
         "didSave": true
       }
+    },
+    "workspace": {
+      "configuration": true,
+      "workspaceFolders": true
     }
   }
 }

cli/bench/lsp.rs

@@ -184,6 +184,22 @@ impl LspClient {
     }
   }
 
+  fn read_request<R>(&mut self) -> Result<(u64, String, Option<R>), AnyError>
+  where
+    R: de::DeserializeOwned,
+  {
+    loop {
+      if let LspMessage::Request(id, method, maybe_params) = self.read()? {
+        if let Some(p) = maybe_params {
+          let params = serde_json::from_value(p)?;
+          return Ok((id, method, Some(params)));
+        } else {
+          return Ok((id, method, None));
+        }
+      }
+    }
+  }
+
   fn write(&mut self, value: Value) -> Result<(), AnyError> {
     let value_str = value.to_string();
     let msg = format!(
@@ -222,6 +238,18 @@ impl LspClient {
     }
   }
 
+  fn write_response<V>(&mut self, id: u64, result: V) -> Result<(), AnyError>
+  where
+    V: Serialize,
+  {
+    let value = json!({
+      "jsonrpc": "2.0",
+      "id": id,
+      "result": result
+    });
+    self.write(value)
+  }
+
   fn write_notification<S, V>(
     &mut self,
     method: S,
@@ -266,6 +294,16 @@ fn bench_big_file_edits(deno_exe: &Path) -> Result<Duration, AnyError> {
     }),
   )?;
 
+  let (id, method, _): (u64, String, Option<Value>) = client.read_request()?;
+  assert_eq!(method, "workspace/configuration");
+
+  client.write_response(
+    id,
+    json!({
+      "enable": true
+    }),
+  )?;
+
   let (method, _): (String, Option<Value>) = client.read_notification()?;
   assert_eq!(method, "textDocument/publishDiagnostics");
   let (method, _): (String, Option<Value>) = client.read_notification()?;
@@ -328,6 +366,16 @@ fn bench_startup_shutdown(deno_exe: &Path) -> Result<Duration, AnyError> {
     }),
   )?;
 
+  let (id, method, _): (u64, String, Option<Value>) = client.read_request()?;
+  assert_eq!(method, "workspace/configuration");
+
+  client.write_response(
+    id,
+    json!({
+      "enable": true
+    }),
+  )?;
+
   let (method, _): (String, Option<Value>) = client.read_notification()?;
   assert_eq!(method, "textDocument/publishDiagnostics");
   let (method, _): (String, Option<Value>) = client.read_notification()?;

cli/lsp/README.md

@@ -61,3 +61,56 @@ with Deno:
     textDocument: TextDocumentIdentifier;
   }
   ```
+
+## Settings
+
+There are several settings that the language server supports for a workspace:
+
+- `deno.enable`
+- `deno.config`
+- `deno.import_map`
+- `deno.code_lens.implementations`
+- `deno.code_lens.references`
+- `deno.code_lens.references_all_functions`
+- `deno.suggest.complete_function_calls`
+- `deno.suggest.names`
+- `deno.suggest.paths`
+- `deno.suggest.auto_imports`
+- `deno.imports.hosts`
+- `deno.lint`
+- `deno.unstable`
+
+There are settings that are support on a per resource basis by the language
+server:
+
+- `deno.enable`
+
+There are several points in the process where Deno analyzes these settings.
+First, when the `initialize` request from the client, the
+`initializationOptions` will be assumed to be an object that represents the
+`deno` namespace of options. For example, the following value:
+
+```json
+{
+  "enable": true,
+  "unstable": true
+}
+```
+
+Would enable Deno with the unstable APIs for this instance of the language
+server.
+
+When the language server receives a `workspace/didChangeConfiguration`
+notification, it will assess if the client has indicated if it has a
+`workspaceConfiguration` capability. If it does, it will send a
+`workspace/configuration` request which will include a request for the workspace
+configuration as well as the configuration of all URIs that the language server
+is currently tracking.
+
+If the client has the `workspaceConfiguration` capability, the language server
+will send a configuration request for the URI when it received the
+`textDocument/didOpen` notification in order to get the resources specific
+settings.
+
+If the client does not have the `workspaceConfiguration` capability, the
+language server will assume the workspace setting applies to all resources.

cli/lsp/capabilities.rs

@@ -27,6 +27,8 @@ use lspower::lsp::TextDocumentSyncCapability;
 use lspower::lsp::TextDocumentSyncKind;
 use lspower::lsp::TextDocumentSyncOptions;
 use lspower::lsp::WorkDoneProgressOptions;
+use lspower::lsp::WorkspaceFoldersServerCapabilities;
+use lspower::lsp::WorkspaceServerCapabilities;
 
 use super::semantic_tokens::get_legend;
 
@@ -132,7 +134,13 @@ pub fn server_capabilities(
         },
       ),
     ),
-    workspace: None,
+    workspace: Some(WorkspaceServerCapabilities {
+      workspace_folders: Some(WorkspaceFoldersServerCapabilities {
+        supported: Some(true),
+        change_notifications: None,
+      }),
+      file_operations: None,
+    }),
     experimental: None,
     linked_editing_range_provider: None,
     moniker_provider: None,

cli/lsp/config.rs

@@ -4,11 +4,14 @@ use deno_core::serde::Deserialize;
 use deno_core::serde_json;
 use deno_core::serde_json::Value;
 use deno_core::url::Url;
+use deno_core::ModuleSpecifier;
 use lspower::jsonrpc::Error as LSPError;
 use lspower::jsonrpc::Result as LSPResult;
 use lspower::lsp;
 use std::collections::HashMap;
 
+pub const SETTINGS_SECTION: &str = "deno";
+
 #[derive(Debug, Clone, Default)]
 pub struct ClientCapabilities {
   pub status_notification: bool,
@@ -84,19 +87,43 @@ impl Default for ImportCompletionSettings {
   }
 }
 
+/// Deno language server specific settings that can be applied uniquely to a
+/// specifier.
+#[derive(Debug, Default, Clone, Deserialize)]
+pub struct SpecifierSettings {
+  /// A flag that indicates if Deno is enabled for this specifier or not.
+  pub enable: bool,
+}
+
+/// Deno language server specific settings that are applied to a workspace.
 #[derive(Debug, Default, Clone, Deserialize)]
 #[serde(rename_all = "camelCase")]
 pub struct WorkspaceSettings {
+  /// A flag that indicates if Deno is enabled for the workspace.
   pub enable: bool,
+
+  /// An option that points to a path string of the tsconfig file to apply to
+  /// code within the workspace.
   pub config: Option<String>,
+
+  /// An option that points to a path string of the import map to apply to the
+  /// code within the workspace.
   pub import_map: Option<String>,
+
+  /// Code lens specific settings for the workspace.
   #[serde(default)]
   pub code_lens: CodeLensSettings,
   #[serde(default)]
+
+  /// Suggestion (auto-completion) settings for the workspace.
   pub suggest: CompletionSettings,
 
+  /// A flag that indicates if linting is enabled for the workspace.
   #[serde(default)]
   pub lint: bool,
+
+  /// A flag that indicates if Dene should validate code against the unstable
+  /// APIs for the workspace.
   #[serde(default)]
   pub unstable: bool,
 }
@@ -113,15 +140,21 @@ impl WorkspaceSettings {
 pub struct Config {
   pub client_capabilities: ClientCapabilities,
   pub root_uri: Option<Url>,
-  pub settings: WorkspaceSettings,
+  pub specifier_settings: HashMap<ModuleSpecifier, SpecifierSettings>,
+  pub workspace_settings: WorkspaceSettings,
 }
 
 impl Config {
-  pub fn update(&mut self, value: Value) -> LSPResult<()> {
-    let settings: WorkspaceSettings = serde_json::from_value(value)
-      .map_err(|err| LSPError::invalid_params(err.to_string()))?;
-    self.settings = settings;
-    Ok(())
+  pub fn contains(&self, specifier: &ModuleSpecifier) -> bool {
+    self.specifier_settings.contains_key(specifier)
+  }
+
+  pub fn specifier_enabled(&self, specifier: &ModuleSpecifier) -> bool {
+    if let Some(settings) = self.specifier_settings.get(specifier) {
+      settings.enable
+    } else {
+      self.workspace_settings.enable
+    }
   }
 
   #[allow(clippy::redundant_closure_call)]
@@ -154,4 +187,68 @@ impl Config {
         .unwrap_or(false);
     }
   }
+
+  pub fn update_specifier(
+    &mut self,
+    specifier: ModuleSpecifier,
+    value: Value,
+  ) -> LSPResult<()> {
+    let settings: SpecifierSettings = serde_json::from_value(value)
+      .map_err(|err| LSPError::invalid_params(err.to_string()))?;
+    self.specifier_settings.insert(specifier, settings);
+    Ok(())
+  }
+
+  pub fn update_workspace(&mut self, value: Value) -> LSPResult<()> {
+    let settings: WorkspaceSettings = serde_json::from_value(value)
+      .map_err(|err| LSPError::invalid_params(err.to_string()))?;
+    self.workspace_settings = settings;
+    self.specifier_settings = HashMap::new();
+    Ok(())
+  }
+}
+
+#[cfg(test)]
+mod tests {
+  use super::*;
+  use deno_core::resolve_url;
+  use deno_core::serde_json::json;
+
+  #[test]
+  fn test_config_contains() {
+    let mut config = Config::default();
+    let specifier = resolve_url("https://deno.land/x/a.ts").unwrap();
+    assert!(!config.contains(&specifier));
+    config
+      .update_specifier(
+        specifier.clone(),
+        json!({
+          "enable": true
+        }),
+      )
+      .expect("could not update specifier");
+    assert!(config.contains(&specifier));
+  }
+
+  #[test]
+  fn test_config_specifier_enabled() {
+    let mut config = Config::default();
+    let specifier = resolve_url("file:///a.ts").unwrap();
+    assert!(!config.specifier_enabled(&specifier));
+    config
+      .update_workspace(json!({
+        "enable": true
+      }))
+      .expect("could not update");
+    assert!(config.specifier_enabled(&specifier));
+    config
+      .update_specifier(
+        specifier.clone(),
+        json!({
+          "enable": false
+        }),
+      )
+      .expect("could not update");
+    assert!(!config.specifier_enabled(&specifier));
+  }
 }