feat(lsp): add a message when someone runs 'deno lsp' manually (#26051)

1 files changed, 14 insertions, 1 deletions

diff --git a/cli/main.rs b/cli/main.rs
index 93bd97e2a..ddb6078af 100644
--- a/cli/main.rs
+++ b/cli/main.rs
@@ -57,6 +57,7 @@ use standalone::MODULE_NOT_FOUND;
 use standalone::UNSUPPORTED_SCHEME;
 use std::env;
 use std::future::Future;
+use std::io::IsTerminal;
 use std::ops::Deref;
 use std::path::PathBuf;
 use std::sync::Arc;
@@ -161,7 +162,19 @@ async fn run_subcommand(flags: Arc<Flags>) -> Result<i32, AnyError> {
     DenoSubcommand::Uninstall(uninstall_flags) => spawn_subcommand(async {
       tools::installer::uninstall(flags, uninstall_flags).await
     }),
-    DenoSubcommand::Lsp => spawn_subcommand(async { lsp::start().await }),
+    DenoSubcommand::Lsp => spawn_subcommand(async {
+      if std::io::stderr().is_terminal() {
+        log::warn!(
+          "{} command is intended to be run by text editors and IDEs and shouldn't be run manually.
+  
+  Visit https://docs.deno.com/runtime/getting_started/setup_your_environment/ for instruction
+  how to setup your favorite text editor.
+  
+  Press Ctrl+C to exit.
+        ", colors::cyan("deno lsp"));
+      }
+      lsp::start().await
+    }),
     DenoSubcommand::Lint(lint_flags) => spawn_subcommand(async {
       if lint_flags.rules {
         tools::lint::print_rules_list(