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`

    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 colors zsh/terminfo

    if [[ "$terminfo[colors]" -ge 8 ]]; then

    colors

    fi

    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.

    typeset -A altchar

    set -A altchar ${(s..)terminfo[acsc]}

    PR_SET_CHARSET="%{$terminfo[enacs]%}"

    PR_SHIFT_IN="%{$terminfo[smacs]%}"

    PR_SHIFT_OUT="%{$terminfo[rmacs]%}"

    PR_HBAR=${altchar[q]:--}

    PR_ULCORNER=${altchar[l]:--}

    PR_LLCORNER=${altchar[m]:--}

    PR_LRCORNER=${altchar[j]:--}

    PR_URCORNER=${altchar[k]:--}

    ###

    # 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