functions rbenv_prompt_info >& /dev/null || rbenv_prompt_info(){}
  
  function theme_precmd {
      local TERMWIDTH
      (( TERMWIDTH = ${COLUMNS} - 1 ))
  
  
      ###
      # Truncate the path if it's too long.
  
      PR_FILLBAR=""
      PR_PWDLEN=""
  
      local promptsize=${#${(%):---(%n@%m:%l)---()--}}
      local rubyprompt=`rvm_prompt_info || rbenv_prompt_info`
      local rubypromptsize=${#${rubyprompt}}
      local pwdsize=${#${(%):-%~}}
  
      if [[ "$promptsize + $rubypromptsize + $pwdsize" -gt $TERMWIDTH ]]; then
        ((PR_PWDLEN=$TERMWIDTH - $promptsize))
      else
        PR_FILLBAR="\${(l.(($TERMWIDTH - ($promptsize + $rubypromptsize + $pwdsize)))..${PR_HBAR}.)}"
      fi
  
  }
  
  
  setopt extended_glob
  theme_preexec () {
      if [[ "$TERM" == "screen" ]]; then
  	local CMD=${1[(wr)^(*=*|sudo|-*)]}
  	echo -n "\ek$CMD\e\\"
      fi
  }
  
  
  setprompt () {
      ###
      # Need this so the prompt will work.
  
      setopt prompt_subst
  
  
      ###
      # See if we can use colors.
  
      autoload zsh/terminfo
      for color in RED GREEN YELLOW BLUE MAGENTA CYAN WHITE GREY; do
  	eval PR_$color='%{$terminfo[bold]$fg[${(L)color}]%}'
  	eval PR_LIGHT_$color='%{$fg[${(L)color}]%}'
  	(( count = $count + 1 ))
      done
      PR_NO_COLOUR="%{$terminfo[sgr0]%}"
  
      ###
      # Modify Git prompt
      ZSH_THEME_GIT_PROMPT_PREFIX=" on %{$fg[green]%}"
      ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%}"
      ZSH_THEME_GIT_PROMPT_DIRTY=""
      ZSH_THEME_GIT_PROMPT_CLEAN=""
  
      ZSH_THEME_GIT_PROMPT_ADDED="%{$fg[green]%} ✚"
      ZSH_THEME_GIT_PROMPT_MODIFIED="%{$fg[blue]%} ✹"
      ZSH_THEME_GIT_PROMPT_DELETED="%{$fg[red]%} ✖"
      ZSH_THEME_GIT_PROMPT_RENAMED="%{$fg[magenta]%} ➜"
      ZSH_THEME_GIT_PROMPT_UNMERGED="%{$fg[yellow]%} ═"
      ZSH_THEME_GIT_PROMPT_UNTRACKED="%{$fg[cyan]%} ✭"
  
      ###
      # See if we can use extended characters to look nicer.
      # UTF-8 Fixed
  
      if [[ $(locale charmap) == "UTF-8" ]]; then
  	PR_SET_CHARSET=""
  	PR_SHIFT_IN=""
  	PR_SHIFT_OUT=""
  	PR_HBAR="─"
          PR_ULCORNER="┌"
          PR_LLCORNER="└"
          PR_LRCORNER="┘"
          PR_URCORNER="┐"
      else
          typeset -A altchar
          set -A altchar ${(s..)terminfo[acsc]}
          # Some stuff to help us draw nice lines
          PR_SET_CHARSET="%{$terminfo[enacs]%}"
          PR_SHIFT_IN="%{$terminfo[smacs]%}"
          PR_SHIFT_OUT="%{$terminfo[rmacs]%}"
          PR_HBAR='$PR_SHIFT_IN${altchar[q]:--}$PR_SHIFT_OUT'
          PR_ULCORNER='$PR_SHIFT_IN${altchar[l]:--}$PR_SHIFT_OUT'
          PR_LLCORNER='$PR_SHIFT_IN${altchar[m]:--}$PR_SHIFT_OUT'
          PR_LRCORNER='$PR_SHIFT_IN${altchar[j]:--}$PR_SHIFT_OUT'
          PR_URCORNER='$PR_SHIFT_IN${altchar[k]:--}$PR_SHIFT_OUT'
       fi
  
  
      ###
      # Decide if we need to set titlebar text.
  
      case $TERM in
  	xterm*)
  	    PR_TITLEBAR=$'%{\e]0;%(!.-=*[ROOT]*=- | .)%n@%m:%~ | ${COLUMNS}x${LINES} | %y\a%}'
  	    ;;
  	screen)
  	    PR_TITLEBAR=$'%{\e_screen \005 (\005t) | %(!.-=[ROOT]=- | .)%n@%m:%~ | ${COLUMNS}x${LINES} | %y\e\\%}'
  	    ;;
  	*)
  	    PR_TITLEBAR=''
  	    ;;
      esac
  
  
      ###
      # Decide whether to set a screen title
      if [[ "$TERM" == "screen" ]]; then
  	PR_STITLE=$'%{\ekzsh\e\\%}'
      else
  	PR_STITLE=''
      fi
  
  
      ###
      # Finally, the prompt.
  
      PROMPT='$PR_SET_CHARSET$PR_STITLE${(e)PR_TITLEBAR}\
  $PR_CYAN$PR_ULCORNER$PR_HBAR$PR_GREY(\
  $PR_GREEN%$PR_PWDLEN<...<%~%<<\
  $PR_GREY)`rvm_prompt_info || rbenv_prompt_info`$PR_CYAN$PR_HBAR$PR_HBAR${(e)PR_FILLBAR}$PR_HBAR$PR_GREY(\
  $PR_CYAN%(!.%SROOT%s.%n)$PR_GREY@$PR_GREEN%m:%l\
  $PR_GREY)$PR_CYAN$PR_HBAR$PR_URCORNER\
  
  $PR_CYAN$PR_LLCORNER$PR_BLUE$PR_HBAR(\
  $PR_YELLOW%D{%H:%M:%S}\
  $PR_LIGHT_BLUE%{$reset_color%}`git_prompt_info``git_prompt_status`$PR_BLUE)$PR_CYAN$PR_HBAR\
  $PR_HBAR\
  >$PR_NO_COLOUR '
  
      # display exitcode on the right when >0
      return_code="%(?..%{$fg[red]%}%? ↵ %{$reset_color%})"
      RPROMPT=' $return_code$PR_CYAN$PR_HBAR$PR_BLUE$PR_HBAR\
  ($PR_YELLOW%D{%a,%b%d}$PR_BLUE)$PR_HBAR$PR_CYAN$PR_LRCORNER$PR_NO_COLOUR'
  
      PS2='$PR_CYAN$PR_HBAR\
  $PR_BLUE$PR_HBAR(\
  $PR_LIGHT_GREEN%_$PR_BLUE)$PR_HBAR\
  $PR_CYAN$PR_HBAR$PR_NO_COLOUR '
  }
  
  setprompt
  
  autoload -U add-zsh-hook
  add-zsh-hook precmd  theme_precmd
  add-zsh-hook preexec theme_preexec