Vim tab preference cycle

tabs.vim

" Cycle tabbing options
map <leader><tab> :call CycleTabs()<CR>
fun! CycleTabs()
    if !&expandtab
        echo "4 space tabs"
        set shiftwidth=4
        set softtabstop=4
        set tabstop=4
        set expandtab
    elseif &expandtab && &shiftwidth == 4
        echo "2 space tabs"
        set shiftwidth=2
        set softtabstop=2
        set tabstop=2
        set expandtab
    else
        echo "Tab characters"
        set shiftwidth=4
        set softtabstop=4
        set tabstop=4
        set noexpandtab
    endif
endfun