ohmyzsh/plugins/vi-mode/vi-mode.plugin.zsh

function zle-line-init zle-keymap-select {
  zle reset-prompt
}

zle -N zle-line-init
zle -N zle-keymap-select

#changing mode clobbers the keybinds, so store the keybinds before and execute 
#them after
binds=`bindkey -L`
bindkey -v
for bind in ${(@f)binds}; do eval $bind; done
unset binds

# if mode indicator wasn't setup by theme, define default
if [[ "$MODE_INDICATOR" == "" ]]; then
  MODE_INDICATOR="%{$fg_bold[red]%}<%{$fg[red]%}<<%{$reset_color%}"
fi

function vi_mode_prompt_info() {
  echo "${${KEYMAP/vicmd/$MODE_INDICATOR}/(main|viins)/}"
}

# define right prompt, if it wasn't defined by a theme
if [[ "$RPS1" == "" && "$RPROMPT" == "" ]]; then
  RPS1='$(vi_mode_prompt_info)'
fi