" create/edit (use 3 or more underscores for a placeholder)
command! -nargs=1 Snip split ~/.vim/snips/<args>

" insert
inoremap \<tab> <esc>"ydiw:r ~/.vim/snips/<c-r>y<cr>=']kJ/___<cr>"ycw

" move between placeholders
inoremap <c-l> <esc>/___<cr>"ycw
inoremap <c-u> <esc>?___<cr>"ycw