commit initial 09-12-2025 020

src/App.js

@@ -206,12 +206,15 @@ function App() {
   // When user types into terminal prompt and presses Enter, append that input to accumStdin + "\n",
   // then re-run the program with updated accumStdin. Repeat until no input cues.
 
-  const resetTerminal = () => {
-    setTerminalLines([]);
-    setTerminalInput("");
+const resetTerminal = (keepAccum = false) => {
+  setTerminalLines([]);
+  setTerminalInput("");
+  // only reset accumulated stdin if caller explicitly wants to clear it
+  if (!keepAccum) {
     setAccumStdin("");
-    setAwaitingInput(false);
-  };
+  }
+  setAwaitingInput(false);
+};
 
   const appendTerminal = (text) => {
     setTerminalLines((prev) => [...prev, text]);
@@ -253,51 +256,57 @@ function codeNeedsInput(code, langId) {
 
   // If code likely needs input and accumStdin is empty, ask for initial input
   const needs = codeNeedsInput(node.content, selectedLang);
-  if (needs && !accumStdin) {
-    // collect multi-line input: user can paste multiple lines separated by \n
+  let stdinToSend = accumStdin || stdin || "";
+
+  if (needs && !stdinToSend) {
     const userText = window.prompt(
-      "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.",
+      "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.",
       ""
     );
-    if (userText == null) {
-      // user pressed cancel: proceed but warn
+
+    if (userText === null) {
+      // user cancelled prompt -> do nothing (abort run)
       appendTerminal("[Run cancelled by user]");
       return;
     }
-    // userText may contain literal backslash-n if pasted; keep it as-is.
-    // Normalize: if the user typed using Enter, it's already multi-line.
+
+    // normalize any literal "\n" sequences into real newlines (helps users pasting)
     const prepared = userText.replace(/\\n/g, "\n");
+    stdinToSend = prepared;
+    // set accumStdin state (so subsequent interactive sends append to it)
     setAccumStdin(prepared);
   }
 
-    // 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);
+  // 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 {
       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 () => {