feat(readline): readline displays default prompt

Author: Tseian

lib/internal/readline/interface.js

@@ -99,6 +99,8 @@ const kMaxLengthOfKillRing = 32;
 
 const kMultilinePrompt = Symbol('| ');
 
+const kDefaultPrompt = '> ';
+
 const kAddHistory = Symbol('_addHistory');
 const kBeforeEdit = Symbol('_beforeEdit');
 const kDecoder = Symbol('_decoder');
@@ -170,7 +172,7 @@ function InterfaceConstructor(input, output, completer, terminal) {
   FunctionPrototypeCall(EventEmitter, this);
 
   let crlfDelay;
-  let prompt = '> ';
+  let prompt = kDefaultPrompt;
   let signal;
 
   if (input?.input) {
@@ -353,6 +355,13 @@ function InterfaceConstructor(input, output, completer, terminal) {
   this[kSetLine]('');
 
   input.resume();
+
+  // If the default prompt prompt is used and the terminal is active, the prompt is automatically displayed.
+  if (prompt === kDefaultPrompt && this.terminal && output !== null && output !== undefined) {    
+    process.nextTick(() => {
+      this.prompt();
+    });
+  }
 }
 
 ObjectSetPrototypeOf(InterfaceConstructor.prototype, EventEmitter.prototype);
@@ -463,6 +472,9 @@ class Interface extends InterfaceConstructor {
       cb(line);
     } else {
       this.emit('line', line);
+      if (this[kPrompt] === kDefaultPrompt && this.terminal && this.output !== null && this.output !== undefined) {  
+        this.prompt();  
+      }  
     }
   }