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As title. When running :bn the current buffer will be switched to the next buffer. I want to get the buffer number of this buffer without changing the current buffer(or, at least, can switch back to the starting buffer)

2 Answers 2

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I can't fint a build-in solution for this, here is a function using getbufinfo() that does not need to actually change buffers:

function! Next_buf()
    let l:bufs = getbufinfo({'buflisted': 1}

    let l:later = filter(l:bufs), 'v:val.bufnr > ' . bufnr())

    if len(l:later) > 0
        return l:later[0].bufnr
    else
        return l:bufs[0].bufnr
    endif
endfunction

I emulated the behavior of :bn of wrapping around at the end and filtering out hidden buffers.

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  • But does the buffer with bufnr() closest to the current one really the next buffer?
    – Kindred
    May 3, 2022 at 16:29
  • 1
    @Kindred I’m not sure I understand your question. This function should behave the same as :bn, that is: return the number of the next visible buffer if any, or the first one otherwise.
    – TothP
    May 3, 2022 at 21:46
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It turns out that the naive way works: (answer in Lua)

vim.cmd('bn')
local buf_right = vim.fn.bufnr()
vim.cmd('bp')

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