Simple jumping through buffers

tabj.vim

command! -nargs=1 -complete=custom,s:TabjCompletion Tabj call s:Tabj(<f-args>)
function! s:Tabj(name)
  for i in range(tabpagenr('$'))
    let tabnr = i + 1

    for bufnr in tabpagebuflist(tabnr)
      if stridx(bufname(bufnr), a:name) >= 0
        exe 'tabnext '.tabnr

        while bufnr('%') != bufnr
          wincmd w
        endwhile

        return
      endif
    endfor
  endfor

  echoerr 'Buffer "'.a:name.'" not found'
endfunction

function! s:TabjCompletion(A, L, P)
  let buffer_names = {}

  for i in range(tabpagenr('$'))
    let tabnr = i + 1
    for bufnr in tabpagebuflist(tabnr)
      let buffer_names[bufname(bufnr)] = 1
    endfor
  endfor

  return join(keys(buffer_names), "\n")
endfunction