switch sources of Homebrew

brewsrc.sh

# switch sources of Homebrew
_brewsrc() {
    # save current working dir
    pwd=$(PWD)

    if [ "$1" = "0" ]; then
        echo "restore brew source to default"
        cd "$(brew --repo)"
        git remote set-url origin https://github.com/Homebrew/brew.git
        cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
        git remote set-url origin https://github.com/Homebrew/homebrew-core.git
    elif [ "$1" = "1" ]; then
        echo "set brew source to tsinghua"
        cd "$(brew --repo)"
        git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/brew.git
        cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
        git remote set-url origin https://mirrors.tuna.tsinghua.edu.cn/git/homebrew/homebrew-core.git
    elif [ "$1" = "2" ]; then
        echo "set brew source to ustc"
        cd "$(brew --repo)"
        git remote set-url origin https://mirrors.ustc.edu.cn/brew.git
        cd "$(brew --repo)/Library/Taps/homebrew/homebrew-core"
        git remote set-url origin https://mirrors.ustc.edu.cn/homebrew-core.git
    else 
        echo ""
        echo "  USAGE: _brewsrc [src]"
        echo ""
        echo "  valid src are the following:"
        echo ""
        echo "      0    default"
        echo "      1    mirrors.tuna.tsinghua.edu.cn"
        echo "      2    mirrors.ustc.edu.cn"
        echo ""
    fi

    # restore current working dir
    cd $pwd
}