From 11fc6c5d86e9956ce2d8d12d9aceeeef6fa68092 Mon Sep 17 00:00:00 2001
From: folkert van heusden <mail@vanheusden.com>
Date: Thu, 9 Jun 2022 19:20:32 +0200
Subject: [PATCH] handle backspace & ^u

---
 console.cpp | 19 +++++++++++++++----
 console.h   |  1 +
 2 files changed, 16 insertions(+), 4 deletions(-)

diff --git a/console.cpp b/console.cpp
index fa54d1f..72b7fd2 100644
--- a/console.cpp
+++ b/console.cpp
@@ -88,6 +88,13 @@ void console::flush_input()
 	input_buffer.clear();
 }
 
+void console::emit_backspace()
+{
+	put_char(8);
+	put_char(' ');
+	put_char(8);
+}
+
 std::string console::read_line(const std::string & prompt)
 {
 	put_string(prompt);
@@ -107,15 +114,19 @@ std::string console::read_line(const std::string & prompt)
 		if (c == 13 || c == 10)
 			break;
 
-		if (c == 8) {
+		if (c == 8 || c == 127) {  // backspace
 			if (!str.empty()) {
 				str = str.substr(0, str.size() - 1);
 
-				put_char(8);
-				put_char(' ');
-				put_char(8);
+				emit_backspace();
 			}
 		}
+		else if (c == 21) {  // ^u
+			for(size_t i=0; i<str.size(); i++)
+				emit_backspace();
+
+			str.clear();
+		}
 		else if (c >= 32 && c < 127) {
 			str += c;
 
diff --git a/console.h b/console.h
index 7bdac7b..d030a66 100644
--- a/console.h
+++ b/console.h
@@ -51,6 +51,7 @@ public:
 	std::string  read_line(const std::string & prompt);
 	void         flush_input();
 
+	void         emit_backspace();
 	void         put_char(const char c);
 	void         put_string(const std::string & what);
 	virtual void put_string_lf(const std::string & what) = 0;