readline: add paste bracket mode - fixes #45213

The paste bracket mode allows REPL to have auto-indentation
that is handled differently when the user copy-pastes the code
from the clipboard and the code already has an indentation.

Author: jcubic

lib/internal/readline/utils.js

@@ -148,8 +148,10 @@ function* emitKeys(stream) {
          *
          *  - `;5` part is optional, e.g. it could be `\x1b[24~`
          *  - first part can contain one or two digits
+         *  - there is also special case when there can be 3 digits
+         *    but without modifier. They are the case of paste bracket mode
          *
-         * So the generic regexp is like /^\d\d?(;\d)?[~^$]$/
+         * So the generic regexp is like /^(?:\d\d?(;\d)?[~^$]|\d{3}~)$/
          *
          *
          * 2. `\x1b[1;5H` should be parsed as { code: '[H', modifier: 5 }
@@ -170,6 +172,10 @@ function* emitKeys(stream) {
 
           if (ch >= '0' && ch <= '9') {
             s += (ch = yield);
+
+            if (ch >= '0' && ch <= '9') {
+              s += (ch = yield);
+            }
           }
         }
 
@@ -189,9 +195,13 @@ function* emitKeys(stream) {
         const cmd = StringPrototypeSlice(s, cmdStart);
         let match;
 
-        if ((match = RegExpPrototypeExec(/^(\d\d?)(;(\d))?([~^$])$/, cmd))) {
-          code += match[1] + match[4];
-          modifier = (match[3] || 1) - 1;
+        if ((match = RegExpPrototypeExec(/^(?:(\d\d?)(?:;(\d))?[~^$]|(\d{3}~))$/, cmd))) {
+          if (match[3]) {
+            code += match[3];
+          } else {
+            code += match[1];
+            modifier = (match[2] || 1) - 1;
+          }
         } else if (
           (match = RegExpPrototypeExec(/^((\d;)?(\d))?([A-Za-z])$/, cmd))
         ) {
@@ -228,6 +238,10 @@ function* emitKeys(stream) {
         case '[13~': key.name = 'f3'; break;
         case '[14~': key.name = 'f4'; break;
 
+        /* paste bracket mode */
+        case '[200~': key.name = 'paste-start'; break;
+        case '[201~': key.name = 'paste-end'; break;
+
         /* from Cygwin and used in libuv */
         case '[[A': key.name = 'f1'; break;
         case '[[B': key.name = 'f2'; break;