feat(lsp): support API for config file (#14139)

Closes: #13910

5 files changed, 80 insertions, 27 deletions

diff --git a/cli/config_file.rs b/cli/config_file.rs
index 156350064..2c1ec7907 100644
--- a/cli/config_file.rs
+++ b/cli/config_file.rs
@@ -649,6 +649,25 @@ impl ConfigFile {
     }
   }
 
+  /// Return any tasks that are defined in the configuration file as a sequence
+  /// of JSON objects providing the name of the task and the arguments of the
+  /// task in a detail field.
+  pub fn to_lsp_tasks(&self) -> Option<Value> {
+    let value = self.json.tasks.clone()?;
+    let tasks: BTreeMap<String, String> = serde_json::from_value(value).ok()?;
+    Some(
+      tasks
+        .into_iter()
+        .map(|(key, value)| {
+          json!({
+            "name": key,
+            "detail": value,
+          })
+        })
+        .collect(),
+    )
+  }
+
   pub fn to_tasks_config(
     &self,
   ) -> Result<Option<BTreeMap<String, String>>, AnyError> {
diff --git a/cli/lsp/capabilities.rs b/cli/lsp/capabilities.rs
index 49adc961d..ed371bab1 100644
--- a/cli/lsp/capabilities.rs
+++ b/cli/lsp/capabilities.rs
@@ -5,32 +5,8 @@
 ///! language server, which helps determine what messages are sent from the
 ///! client.
 ///!
-use lspower::lsp::CallHierarchyServerCapability;
-use lspower::lsp::ClientCapabilities;
-use lspower::lsp::CodeActionKind;
-use lspower::lsp::CodeActionOptions;
-use lspower::lsp::CodeActionProviderCapability;
-use lspower::lsp::CodeLensOptions;
-use lspower::lsp::CompletionOptions;
-use lspower::lsp::DocumentSymbolOptions;
-use lspower::lsp::FoldingRangeProviderCapability;
-use lspower::lsp::HoverProviderCapability;
-use lspower::lsp::ImplementationProviderCapability;
-use lspower::lsp::OneOf;
-use lspower::lsp::SaveOptions;
-use lspower::lsp::SelectionRangeProviderCapability;
-use lspower::lsp::SemanticTokensFullOptions;
-use lspower::lsp::SemanticTokensOptions;
-use lspower::lsp::SemanticTokensServerCapabilities;
-use lspower::lsp::ServerCapabilities;
-use lspower::lsp::SignatureHelpOptions;
-use lspower::lsp::TextDocumentSyncCapability;
-use lspower::lsp::TextDocumentSyncKind;
-use lspower::lsp::TextDocumentSyncOptions;
-use lspower::lsp::TypeDefinitionProviderCapability;
-use lspower::lsp::WorkDoneProgressOptions;
-use lspower::lsp::WorkspaceFoldersServerCapabilities;
-use lspower::lsp::WorkspaceServerCapabilities;
+use deno_core::serde_json::json;
+use lspower::lsp::*;
 
 use super::refactor::ALL_KNOWN_REFACTOR_ACTION_KINDS;
 use super::semantic_tokens::get_legend;
@@ -158,8 +134,10 @@ pub fn server_capabilities(
       }),
       file_operations: None,
     }),
-    experimental: None,
     linked_editing_range_provider: None,
     moniker_provider: None,
+    experimental: Some(json!({
+      "denoConfigTasks": true,
+    })),
   }
 }
diff --git a/cli/lsp/language_server.rs b/cli/lsp/language_server.rs
index c2083bc48..1afcff8a6 100644
--- a/cli/lsp/language_server.rs
+++ b/cli/lsp/language_server.rs
@@ -2141,6 +2141,7 @@ impl Inner {
       lsp_custom::RELOAD_IMPORT_REGISTRIES_REQUEST => {
         self.reload_import_registries().await
       }
+      lsp_custom::TASK_REQUEST => self.get_tasks(),
       lsp_custom::VIRTUAL_TEXT_DOCUMENT => {
         match params.map(serde_json::from_value) {
           Some(Ok(params)) => Ok(Some(
@@ -2831,6 +2832,15 @@ impl Inner {
     json!({ "averages": averages })
   }
 
+  fn get_tasks(&self) -> LspResult<Option<Value>> {
+    Ok(
+      self
+        .maybe_config_file
+        .as_ref()
+        .and_then(|cf| cf.to_lsp_tasks()),
+    )
+  }
+
   async fn reload_import_registries(&mut self) -> LspResult<Option<Value>> {
     fs_util::remove_dir_all_if_exists(&self.module_registries_location)
       .await
diff --git a/cli/lsp/lsp_custom.rs b/cli/lsp/lsp_custom.rs
index 1d8c20984..eff55e2ea 100644
--- a/cli/lsp/lsp_custom.rs
+++ b/cli/lsp/lsp_custom.rs
@@ -6,6 +6,7 @@ use lspower::lsp;
 
 pub const CACHE_REQUEST: &str = "deno/cache";
 pub const PERFORMANCE_REQUEST: &str = "deno/performance";
+pub const TASK_REQUEST: &str = "deno/task";
 pub const RELOAD_IMPORT_REGISTRIES_REQUEST: &str =
   "deno/reloadImportRegistries";
 pub const VIRTUAL_TEXT_DOCUMENT: &str = "deno/virtualTextDocument";
diff --git a/cli/tests/integration/lsp_tests.rs b/cli/tests/integration/lsp_tests.rs
index b8f33ddcc..63695634a 100644
--- a/cli/tests/integration/lsp_tests.rs
+++ b/cli/tests/integration/lsp_tests.rs
@@ -580,6 +580,51 @@ fn lsp_import_map_config_file() {
 }
 
 #[test]
+fn lsp_deno_task() {
+  let temp_dir = TempDir::new().unwrap();
+  let workspace_root = temp_dir.path().canonicalize().unwrap();
+  let mut params: lsp::InitializeParams =
+    serde_json::from_value(load_fixture("initialize_params.json")).unwrap();
+  fs::write(
+    workspace_root.join("deno.jsonc"),
+    r#"{
+    "tasks": {
+      "build": "deno test",
+      "some:test": "deno bundle mod.ts"
+    }
+  }"#,
+  )
+  .unwrap();
+
+  params.root_uri = Some(Url::from_file_path(workspace_root).unwrap());
+
+  let deno_exe = deno_exe_path();
+  let mut client = LspClient::new(&deno_exe).unwrap();
+  client
+    .write_request::<_, _, Value>("initialize", params)
+    .unwrap();
+
+  let (maybe_res, maybe_err) = client
+    .write_request::<_, _, Value>("deno/task", json!({}))
+    .unwrap();
+
+  assert!(maybe_err.is_none());
+  assert_eq!(
+    maybe_res,
+    Some(json!([
+      {
+        "name": "build",
+        "detail": "deno test"
+      },
+      {
+        "name": "some:test",
+        "detail": "deno bundle mod.ts"
+      }
+    ]))
+  );
+}
+
+#[test]
 fn lsp_import_assertions() {
   let mut client = init("initialize_params_import_map.json");
   client