Smart Window Resizing in Neovim

2025-04-12

The last day or two, I've been refitting my Neovim windowing config. Nothing too wild, just fixing a few warts here and there. What follows is a few different snippets for different behaviors I wanted. Hopefully one of these is useful to someone, even if only as a reference (something definitely needs said about the Neovim documentation searchability situation).

Also, if you're interested in this, I will drop a link to Nano Tips For Vim, which has been immensely helpful to me in figuring out all of my Neovim configs.

Turn Off Line Numbers for Small Windows

local set_numbers = function(value, window)
	vim.api.nvim_set_option_value("number", value, { win = window })
	vim.api.nvim_set_option_value("relativenumber", value, { win = window })
end
local window_size_threshold = 40

vim.api.nvim_create_autocmd("WinResized", {
	callback = function()
		for _, win in ipairs(vim.api.nvim_list_wins()) do
			local width = vim.api.nvim_win_get_width(win)
			if width < window_size_threshold then
				set_numbers(false, win)
			else
				set_numbers(true, win)
			end
		end
	end,
})

Bring Window Into Focus

local win_focus = function()
    -- Uncomment if you use either of these plugins
	-- require("dapui").close()
	-- require("nvim-tree.api").tree.close()

	local current_win = vim.api.nvim_get_current_win()
	local windows = vim.api.nvim_list_wins()
	vim.api.nvim_win_set_width(0, vim.o.columns - (#windows * 20))
	for _, win in ipairs(windows) do
		if win ~= current_win then
			vim.api.nvim_win_set_width(win, 20)
		end
	end
end

keymap("n", "<leader>rs", function()
	vim.api.nvim_win_set_width(0, 20)
end)
keymap("n", "<leader>rf", win_focus)

Resizing Mappings

This requires the winresize.nvim plugin.

local win_resize = function(win, amt, dir)
	return function()
		require("winresize").resize(win, amt, dir)
	end
end

wk_add("<leader>r", "Window Resize")
keymap("n", "<leader>rh", win_resize(0, 10, "left"))
keymap("n", "<leader>rj", win_resize(0, 3, "down"))
keymap("n", "<leader>rk", win_resize(0, 3, "up"))
keymap("n", "<leader>rl", win_resize(0, 10, "right"))
keymap("n", "<leader>r=", "<C-w>=", { desc = "Equalize Windows" })