git branch menu using fzf (zsh syntax)

fbr () {
    local branches branch
    local query=$1
    local opts="--cycle +m -e --color=spinner:233,info:233 --select-1 --exit-0 --preview-window down:10 --height 50%"
    if ! [[ -z "${query// }" ]]
    then
        opts="$=opts -q ${query}"
    fi
    branches=$(git branch)  && branch=$(echo "$branches" | fzf "$=opts" --preview 'git --no-pager log --oneline --decorate --graph -n10 {1}')  && git checkout $(echo "$branch" | awk '{print $1}' | sed "s/.* //")
}