fix(cli): prompt works with windows eol and eof (#8149)

cli/rt/41_prompt.js

@@ -3,6 +3,7 @@
   const { stdin, stdout } = window.__bootstrap.files;
   const { isatty } = window.__bootstrap.tty;
   const LF = "\n".charCodeAt(0);
+  const CR = "\r".charCodeAt(0);
   const encoder = new TextEncoder();
   const decoder = new TextDecoder();
 
@@ -50,7 +51,20 @@
 
     while (true) {
       const n = stdin.readSync(c);
-      if (n === 0 || c[0] === LF) {
+      if (n === null || n === 0) {
+        break;
+      }
+      if (c[0] === CR) {
+        const n = stdin.readSync(c);
+        if (c[0] === LF) {
+          break;
+        }
+        buf.push(CR);
+        if (n === null || n === 0) {
+          break;
+        }
+      }
+      if (c[0] === LF) {
         break;
       }
       buf.push(c[0]);

cli/tests/066_prompt.ts

@@ -12,6 +12,10 @@ const answer2 = confirm("Question 2"); // Answer with yes (returns false)
 console.log(`Your answer is ${answer2}`);
 const answer3 = confirm(); // Answer with default
 console.log(`Your answer is ${answer3}`);
+const windows = prompt("What is Windows EOL?");
+console.log(`Your answer is ${JSON.stringify(windows)}`);
 alert("Hi");
 alert();
 console.log("The end of test");
+const eof = prompt("What is EOF?");
+console.log(`Your answer is ${JSON.stringify(eof)}`);

cli/tests/066_prompt.ts.out

@@ -5,4 +5,6 @@ Question 0 [y/N] Your answer is true
 Question 1 [y/N] Your answer is false
 Question 2 [y/N] Your answer is false
 Confirm [y/N] Your answer is false
+What is Windows EOL? Your answer is "windows"
 Hi [Enter] Alert [Enter] The end of test
+What is EOF? Your answer is null

cli/tests/integration_tests.rs

@@ -2185,7 +2185,7 @@ fn _066_prompt() {
   let args = "run --unstable 066_prompt.ts";
   let output = "066_prompt.ts.out";
   // These are answers to prompt, confirm, and alert calls.
-  let input = b"John Doe\n\nfoo\nY\nN\nyes\n\n\n\n";
+  let input = b"John Doe\n\nfoo\nY\nN\nyes\n\nwindows\r\n\n\n";
 
   util::test_pty(args, output, input);
 }