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=""