# Updates editor information when the keymap changes.
  function zle-keymap-select() {

    zle reset-prompt
    zle -R
  }
  
  # Ensure that the prompt is redrawn when the terminal size changes.
  TRAPWINCH() {

    zle && { zle reset-prompt; zle -R }

  }

  zle -N zle-keymap-select
  zle -N edit-command-line
  
  
  bindkey -v
  
  # allow v to edit the command line (standard behaviour)
  autoload -Uz edit-command-line
  bindkey -M vicmd 'v' edit-command-line

  # allow ctrl-p, ctrl-n for navigate history (standard behaviour)
  bindkey '^P' up-history
  bindkey '^N' down-history
  
  # allow ctrl-h, ctrl-w, ctrl-? for char and word deletion (standard behaviour)
  bindkey '^?' backward-delete-char
  bindkey '^h' backward-delete-char
  bindkey '^w' backward-kill-word

  # 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