From cd3a9928c24d504cb67338921a3a3c1ac3178c22 Mon Sep 17 00:00:00 2001
From: P. J. McDermott <pj@pehjota.net>
Date: Thu, 29 Oct 2015 01:02:38 -0400
Subject: tui_show_prompt(): Implement KEY_BACKSPACE line editing

---
(limited to 'src/ui')

diff --git a/src/ui/tui.sh b/src/ui/tui.sh
index 6cf0f9f..34c3a61 100644
--- a/src/ui/tui.sh
+++ b/src/ui/tui.sh
@@ -262,10 +262,17 @@ tui_show_prompt()
 					fi
 					;;
 				KEY_BACKSPACE)
-					if [ ${curpos} -gt 0 ]; then
-						input="${input%?}"
-						curpos=$(($curpos - 1))
-					fi
+					[ ${curpos} -gt 0 ] || continue
+					i=1
+					mask=''
+					while [ ${i} -lt ${curpos} ]; do
+						mask="${mask}."
+						i=$(($i + 1))
+					done
+					cmd="s/^\\(${mask}\\).\\(.*\\)\$/\1\2/"
+					input="$(printf '%s' "${input}" | sed \
+						"${cmd}")"
+					curpos=$(($curpos - 1))
 					;;
 				KEY_DEL)
 					[ ${curpos} -lt ${#input} ] || continue
--
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