git bash prompt with elapsed time and return code

.bashrc

function timer_start {
  timer=${timer:-$SECONDS}
}

function timer_stop {
  exit_code=$?
  timer_show=$(($SECONDS - $timer))
  unset timer
}

trap 'timer_start' DEBUG

exit_code_ps1() {
    timer_stop;
    #[[ $exit_code -ne 0 ]] && echo "\[\e[01;31m\]✘ " || echo "\[\e[01;32m\]✔ "
    [[ $exit_code -ne 0 ]] && echo -n "\[\e[01;31m\]" || echo -n "\[\e[01;32m\]"
    echo [${timer_show}s]
}

source /usr/share/git/git-prompt.sh
export GIT_PS1_SHOWDIRTYSTATE=true
export GIT_PS1_SHOWSTASHSTATE=true
export GIT_PS1_SHOWUNTRACKEDFILES=true
export GIT_PS1_SHOWUPSTREAM="auto"
#export GIT_PS1_STATESEPARATOR="|"
export GIT_PS1_SHOWCOLORHINTS=true

#export PS1='[\u@\h \W$(__git_ps1 " (%s)")]\$ '
#export PROMPT_COMMAND='__git_ps1 "\e[01;32m\]\u@\h \e[01;34m\]\W " "\e[01;34m\]\\\$ \e[00m\]" "\e[01;33m\]%s) "'
#export PROMPT_COMMAND='__git_ps1 "\e[01;32m\]\u@\h \e[01;34m\]\W " "$(exit_code_ps1)\e[01;34m\]\\\$ \e[00m\]" "\e[01;33m\](%s) "'
#export PROMPT_COMMAND='__git_ps1 "\e[01;32m\]\u@\h \e[01;34m\]\W " "$(exit_code_ps1)\e[01;34m\]\\\$ \e[00m\]" "\e[01;33m\](%s) "; timer_stop; PS1="[${timer_show}s] $PS1"'
#export PROMPT_COMMAND='__git_ps1 "\e[01;32m\]\u@\h \e[01;34m\]\W " "$(exit_code_ps1)\e[01;34m\]\\\$ \e[00m\]" "\e[01;33m\][%s\e[01;33m\]] "; timer_stop; PS1="[${timer_show}s] $PS1"'
#export PROMPT_COMMAND='__git_ps1 "\[\e[01;32m\]\u@\h \[\e[01;34m\]\W " "$(exit_code_ps1)\[\e[01;34m\]\\\$ \[\e[00m\]" "\[\e[01;33m\][%s\[\e[01;33m\]] "; timer_stop; PS1="[${timer_show}s] $PS1"'
export PROMPT_COMMAND='__git_ps1 "$(exit_code_ps1) \[\e[01;32m\]\u@\h \[\e[01;34m\]\W " "\[\e[01;34m\]\\\$ \[\e[00m\]" "\[\e[01;33m\][%s\[\e[01;33m\]] "; timer_stop'

# if [ "$PROMPT_COMMAND" == "" ]; then
#   PROMPT_COMMAND="timer_stop"
# else
#   PROMPT_COMMAND="$PROMPT_COMMAND; timer_stop"
# fi