From ac2491acc56f8eac1438d0963a09cc92d34f2d6f Mon Sep 17 00:00:00 2001
From: Guillaume Souchere <guillaume.souchere@espressif.com>
Date: Wed, 17 Apr 2024 10:17:52 +0200
Subject: [PATCH] fix(console): bug where backspace erases the prompt in dumb
 mode

---
 components/console/linenoise/linenoise.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/components/console/linenoise/linenoise.c b/components/console/linenoise/linenoise.c
index 221c86c20e..46ae946c44 100644
--- a/components/console/linenoise/linenoise.c
+++ b/components/console/linenoise/linenoise.c
@@ -1121,10 +1121,16 @@ static int linenoiseDumb(char* buf, size_t buflen, const char* prompt) {
         } else if (c == BACKSPACE || c == 0x8) {
             if (count > 0) {
                 buf[count - 1] = 0;
-                count --;
+                count--;
+
+                /* Only erase symbol echoed from stdin. */
+                fputs("\x08 ", stdout); /* Windows CMD: erase symbol under cursor */
+                flushWrite();
+            } else {
+                /* Consume backspace if the command line is empty to avoid erasing the prompt */
+                continue;
             }
-            fputs("\x08 ", stdout); /* Windows CMD: erase symbol under cursor */
-            flushWrite();
+
         } else {
             buf[count] = c;
             ++count;