From 3766ebbd70a1931aa471945b0e5b07ce07eeed95 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 | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/components/console/linenoise/linenoise.c b/components/console/linenoise/linenoise.c
index 3a94e81b00..ed031fb401 100644
--- a/components/console/linenoise/linenoise.c
+++ b/components/console/linenoise/linenoise.c
@@ -1120,9 +1120,15 @@ 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 */
         } else {
             buf[count] = c;
             ++count;