function prompt_char {
    git branch >/dev/null 2>/dev/null && echo '±' && return
    hg root >/dev/null 2>/dev/null && echo 'Hg' && return
    echo '○'
}

function virtualenv_info {
    [[ -n "$VIRTUAL_ENV" ]] && echo '('${VIRTUAL_ENV:t}') '
}

function ruby_prompt {
    if (( $+commands[rvm-prompt] )); then
        print -n $ZSH_THEME_RUBY_PROMPT_PREFIX
        print -n $(~/.rvm/bin/rvm-prompt)
        print -n $ZSH_THEME_RUBY_PROMPT_SUFFIX
    elif (( $+commands[rbenv] )); then
        print -n $ZSH_THEME_RUBY_PROMPT_PREFIX
        print -n $(rbenv version | sed -e "s/ (set.*$//")
        print -n $ZSH_THEME_RUBY_PROMPT_SUFFIX
    fi
    return 0
}

PROMPT='%F{magenta}%n%f at %F{yellow}%m%f in %B%F{green}%~%f%b$(git_prompt_info)$(ruby_prompt)
$(virtualenv_info) $(prompt_char) '

ZSH_THEME_GIT_PROMPT_PREFIX=' on %F{magenta}'
ZSH_THEME_GIT_PROMPT_SUFFIX='%f'
ZSH_THEME_GIT_PROMPT_DIRTY='%F{green}!'
ZSH_THEME_GIT_PROMPT_UNTRACKED='%F{green}?'
ZSH_THEME_GIT_PROMPT_CLEAN=''

ZSH_THEME_RUBY_PROMPT_PREFIX=' using %F{red}'
ZSH_THEME_RUBY_PROMPT_SUFFIX='%f'