Jump through Vim's jump list one buffer at a time

jumpbuf.vim

" Jump backwards or forwards through the jump list one buffer at a time,
" rather than one jump at a time.
"
" Use <Leader>o to jump backwards and <Leader>i to jump forwards

let s:JUMPLIMIT = 100

if exists('g:loaded_jump_buf') && loaded_jump_buf
    finish
endif
let loaded_jump_buf = 1

function! <SID>jump_buf(back)

    let orig_buf = bufnr('%')
    let i = 0
    while bufnr('%') == orig_buf && i < s:JUMPLIMIT
        execute 'normal!' (a:back ? "\<C-O>" : "1\<C-I>")
        let i += 1
    endwhile

    let end_buf = bufnr('%')

    if a:back && i == s:JUMPLIMIT && end_buf == orig_buf
        buffer #
        echohl WarningMsg
        echomsg 'Jump list limit exceeded; switching to alternate buffer'
        echohl None
    endif

endfunction

nnoremap <silent> <Leader>o :call <SID>jump_buf(1)<CR>
nnoremap <silent> <Leader>i :call <SID>jump_buf(0)<CR>