# ZSH Theme - Preview: http://gyazo.com/8becc8a7ed5ab54a0262a470555c3eed.png
local return_code="%(?..%{$fg[red]%}%? ↵%{$reset_color%})"

local user_host='%{$terminfo[bold]$fg[green]%}%n@%m%{$reset_color%}'
local current_dir='%{$terminfo[bold]$fg[blue]%} %~%{$reset_color%}'
local rvm_ruby=''
if which rvm-prompt &> /dev/null; then
  rvm_ruby='%{$fg[red]%}‹$(rvm-prompt i v g)›%{$reset_color%}'
else
  if which rbenv &> /dev/null; then
    rvm_ruby='%{$fg[red]%}‹$(rbenv version | sed -e "s/ (set.*$//")›%{$reset_color%}'
  fi
fi

setopt prompt_subst

PROMPT="╭ ${user_host} %t ${current_dir} ${rvm_ruby}
╰ %B$%b "
RPROMPT=""
RPS1="${return_code}"

ZSH_THEME_GIT_PROMPT_PREFIX="%{$fg[yellow]%}‹"
ZSH_THEME_GIT_PROMPT_SUFFIX="› %{$reset_color%}"
ZSH_THEME_GIT_PROMPT_CLEAN="✔"
ZSH_THEME_GIT_PROMPT_DIRTY="✗"

ASYNC_PROC=0
function precmd() {
    function async() {
        # save to temp file
        printf "%s" "$(git_prompt_info)" > "${HOME}/.zsh_tmp_prompt"

        # signal parent
        kill -s USR1 $$
    }

    # do not clear RPROMPT, let it persist

    # kill child if necessary
    if [[ "${ASYNC_PROC}" != 0 ]]; then
        kill -s HUP $ASYNC_PROC >/dev/null 2>&1 || :
    fi

    # start background computation
    async &!
    ASYNC_PROC=$!
}

function TRAPUSR1() {
    # read from temp file
    PROMPT="╭ ${user_host} %t ${current_dir} ${rvm_ruby} $(cat ${HOME}/.zsh_tmp_prompt)
╰ %B$%b "

    # reset proc number
    ASYNC_PROC=0

    # redisplay
    zle && zle reset-prompt
}