一、安装bash-completion

• 安装Homebrew
  /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
• 安装bash-completion
  brew install bash-completion
• 根据bash-completion安装完成后提示，将[ -f /usr/local/etc/bash_completion ] && . /usr/local/etc/bash_completion加入~/.bash_profile

二、下载git-completion.bash文件

• 拷贝该页面代码到本地~/.git-completion.bash

• 将source ~/.git-completion.bash加入~/.bash_profile

• 执行source ~/.bash_profile