This is deprecated, please use lua script in neovim instead:

vim.api.nvim_create_user_command("ClearHiddenBuffer", function(opts)
	local non_hidden_buffer = {}
	for _, win in ipairs(vim.api.nvim_list_wins()) do
		local buf = vim.api.nvim_win_get_buf(win)
		non_hidden_buffer[buf] = true
	end

	local buffers = vim.api.nvim_list_bufs()
	for _, buf in ipairs(buffers) do
		local modified = vim.fn.getbufvar(buf, "&modified")
		-- we won't delete modified buffer
		if modified ~= 1 and non_hidden_buffer[buf] == nil then
			vim.api.nvim_buf_delete(buf, {
				force = false,
			})
		end
	end
	-- Force bufferline to reload
	vim.api.nvim_exec("BufferLineSortByTabs", false)
end, {})

vim-bufclean

A vim-plugin to delete all buffers except those opened in the window.

This script is based on another simple official plugin script written by Christian J. Robinson:

https://github.com/vim-scripts/BufOnly.vim/blob/master/plugin/BufOnly.vim

This official script only keeps the buffer of the current window, and the buffers of other windows will be deleted together, which does not meet my requirements, so this version of BufOnly is provided, I named it BufClean, it will keep the current open window Buffer.

This command can work with BufOnly. When you want to keep the opened window, execute BufClean, and execute BufOnly when you don't want to keep the them.

Install

bufclean can be installed in various ways like other vim plugins.

For examples, use the vim-plug:

Plug 'fioncat/vim-bufclean'

Usage

After installation, you can use :BufClean to execute the command. More details please refer to :help BufClean.