autoload -Uz vcs_info add-zsh-hook
zstyle ":vcs_info:git:*" formats "(%b)"
prompt_vcs_info() { vcs_info }
add-zsh-hook precmd prompt_vcs_info
setopt prompt_subst
PROMPT='${vcs_info_msg_0_:+$vcs_info_msg_0_ }%# '