From ee6aa3a34601952c0802ffa1459f1da0890646f8 Mon Sep 17 00:00:00 2001
From: Nathan Jones <nathan@ncjones.com>
Date: Sat, 4 Jul 2015 01:07:54 +1200
Subject: [PATCH] handle backspace in get_pass

---
 pwd.sh | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)

diff --git a/pwd.sh b/pwd.sh
index 92e9dd8..ca78ea1 100755
--- a/pwd.sh
+++ b/pwd.sh
@@ -21,14 +21,23 @@ fail () {
 get_pass () {
   # Prompt for a password.
 
-  unset password
+  password=''
   prompt="${1}"
   while IFS= read -p "${prompt}" -r -s -n 1 char ; do
-      if [[ ${char} == $'\0' ]] ; then
-        break
+    if [[ ${char} == $'\0' ]] ; then
+      break
+    fi
+    if [[ ${char} == $'\177' ]]; then
+      if [[ -z "${password}" ]]; then
+        prompt=''
+      else
+        prompt=$'\b \b'
+        password="${password%?}"
       fi
+    else
       prompt='*'
       password+="${char}"
+    fi
   done
 
   if [ -z ${password+x} ] ; then