print warning when trying to run serve command in TTY (#155)

crates/djls-server/src/lib.rs

@@ -6,6 +6,8 @@ mod server;
 mod session;
 mod workspace;
 
+use std::io::IsTerminal;
+
 use anyhow::Result;
 use tower_lsp_server::LspService;
 use tower_lsp_server::Server;
@@ -13,6 +15,28 @@ use tower_lsp_server::Server;
 use crate::server::DjangoLanguageServer;
 
 pub fn run() -> Result<()> {
+    if std::io::stdin().is_terminal() {
+        eprintln!(
+            "---------------------------------------------------------------------------------"
+        );
+        eprintln!("Django Language Server is running directly in a terminal.");
+        eprintln!(
+            "This server is designed to communicate over stdin/stdout with a language client."
+        );
+        eprintln!("It is not intended to be used directly in a terminal.");
+        eprintln!();
+        eprintln!(
+            "Note: The server is now waiting for LSP messages, but since you're in a terminal,"
+        );
+        eprintln!("no editor is connected and the server won't do anything.");
+        eprintln!();
+        eprintln!("To exit: Press ENTER to send invalid input and trigger an error exit.");
+        eprintln!("Ctrl+C will not work as expected due to LSP stdio communication.");
+        eprintln!(
+            "---------------------------------------------------------------------------------"
+        );
+    }
+
     let runtime = tokio::runtime::Builder::new_current_thread()
         .enable_all()
         .build()?;