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 {
      [ $VIRTUAL_ENV ] && echo '('`basename $VIRTUAL_ENV`') '
  }
  
  function collapse_pwd {
      echo $(pwd | sed -e "s,^$HOME,~,")
  }
  
  if which rvm-prompt &> /dev/null; then
    PROMPT='%{$fg[magenta]%}%n%{$reset_color%} at %{$fg[yellow]%}%m%{$reset_color%} in %{$fg_bold[green]%}${PWD/#$HOME/~}%{$reset_color%}$(git_prompt_info) using %{$reset_color%}%{$fg[red]%}$(~/.rvm/bin/rvm-prompt)%{$reset_color%} 
  $(virtualenv_info)$(prompt_char) '
  else
    if which rbenv &> /dev/null; then
      PROMPT='%{$fg[magenta]%}%n%{$reset_color%} at %{$fg[yellow]%}%m%{$reset_color%} in %{$fg_bold[green]%}${PWD/#$HOME/~}%{$reset_color%}$(git_prompt_info) using %{$reset_color%}%{$fg[red]%}$(rbenv version | sed -e "s/ (set.*$//")%{$reset_color%} 
  $(virtualenv_info)$(prompt_char) '
    fi
  fi
  
  
  ZSH_THEME_GIT_PROMPT_PREFIX=" on %{$fg[magenta]%}"
  ZSH_THEME_GIT_PROMPT_SUFFIX="%{$reset_color%}"
  ZSH_THEME_GIT_PROMPT_DIRTY="%{$fg[green]%}!"
  ZSH_THEME_GIT_PROMPT_UNTRACKED="%{$fg[green]%}?"
  ZSH_THEME_GIT_PROMPT_CLEAN=""