commit initial 09-12-2025 025

src/App.js

@@ -256,57 +256,51 @@ function codeNeedsInput(code, langId) {
 
   // If code likely needs input and accumStdin is empty, ask for initial input
   const needs = codeNeedsInput(node.content, selectedLang);
-  let stdinToSend = accumStdin || stdin || "";
-
-  if (needs && !stdinToSend) {
+  if (needs && !accumStdin) {
+    // collect multi-line input: user can paste multiple lines separated by \n
     const userText = window.prompt(
-      "This program appears to request console input (e.g. input() / Scanner).\n\nEnter input lines — use Enter for new lines or paste multi-line input. Leave empty to run without input.",
+      "This program appears to request console input (e.g. input() / Scanner).\n\nEnter input lines separated by a newline (\\n). Leave empty to run without input.",
       ""
     );
-
-    if (userText === null) {
-      // user cancelled prompt -> do nothing (abort run)
+    if (userText == null) {
+      // user pressed cancel: proceed but warn
       appendTerminal("[Run cancelled by user]");
       return;
     }
-
-    // normalize any literal "\n" sequences into real newlines (helps users pasting)
+    // userText may contain literal backslash-n if pasted; keep it as-is.
+    // Normalize: if the user typed using Enter, it's already multi-line.
     const prepared = userText.replace(/\\n/g, "\n");
-    stdinToSend = prepared;
-    // set accumStdin state (so subsequent interactive sends append to it)
     setAccumStdin(prepared);
   }
 
-  // start a fresh terminal *but keep accumStdin* because we want to use it during run
-  // pass keepAccum = true to avoid clearing accumStdin
-  resetTerminal(true);
-  appendTerminal(`[Running with stdin length=${stdinToSend ? stdinToSend.length : 0}]`);
-  setIsRunning(true);
-  setProblems([]);
-  setOutput("");
-
-  try {
-    // IMPORTANT: use local stdinToSend (not state) so the run uses the value right away
-    const res = await runCode(node.content, selectedLang, stdinToSend);
-    const out = res.output ?? "";
-    setOutput(out);
-    appendTerminal(out);
-    setProblems(res.error ? parseProblems(res.output) : []);
-
-    if (outputLooksForInput(out)) {
-      setAwaitingInput(true);
-    } else {
+    // clear terminal state and start a fresh run
+    resetTerminal();
+    setIsRunning(true);
+    setProblems([]);
+    setOutput("");
+    try {
+      // call backend with current accumStdin (empty on first run)
+      const res = await runCode(node.content, selectedLang, accumStdin || stdin || "");
+      const out = res.output ?? "";
+      setOutput(out);
+      appendTerminal(out);
+      setProblems(res.error ? parseProblems(res.output) : []);
+
+      if (outputLooksForInput(out)) {
+        // program likely wants input: show prompt
+        setAwaitingInput(true);
+      } else {
+        setAwaitingInput(false);
+      }
+    } catch (err) {
+      const e = String(err);
+      setOutput(e);
+      appendTerminal(e);
       setAwaitingInput(false);
+    } finally {
+      setIsRunning(false);
     }
-  } catch (err) {
-    const e = String(err);
-    setOutput(e);
-    appendTerminal(e);
-    setAwaitingInput(false);
-  } finally {
-    setIsRunning(false);
-  }
-};
+  };
 
   // Called when user types input into terminal and presses Enter
   const sendTerminalInput = async () => {