Add return value to bash prompt

skel/.bashrc

@@ -34,7 +34,7 @@ shopt -s checkwinsize
 if [ -z "${debian_chroot:-}" ] && [ -r /etc/debian_chroot ]; then
     debian_chroot=$(cat /etc/debian_chroot)
 fi
-
+$()
 # set a fancy prompt (non-color, unless we know we "want" color)
 case "$TERM" in
     xterm*) color_prompt=yes;;
@@ -72,6 +72,15 @@ xterm*|rxvt*)
     ;;
 esac
 
+# Add goodies to PS1
+export BASE_PS1="$PS1"
+export BASE_PS1="$(echo "$BASE_PS1" | sed 's!\\\$ $!!g')"
+export BASE_PS1_END='\$ '
+
+# show return value if prompt is nonzero
+export BASH_GOODIES_RETURNVAL='$([ "$?" = 0 ] && echo "" || echo " \e[31m\][$?]\[\e[0m\] ")'
+PS1="${BASE_PS1}${BASH_GOODIES_RETURNVAL}${BASE_PS1_END}"
+
 # enable color support of ls and also add handy aliases
 if [ -x /usr/bin/dircolors ]; then
     test -r ~/.dircolors && eval "$(dircolors -b ~/.dircolors)" || eval "$(dircolors -b)"