feat(nvim): Port LazyFile

REF: https://github.com/folke/lazy.nvim/issues/1182

.config/nvim/lua/null/util.lua

@@ -30,4 +30,74 @@ function M.map(modes, key, target, opts)
 	})
 end
 
+-- << REF: https://github.com/LazyVim/LazyVim/blob/7a5dbea/lua/lazyvim/util/plugin.lua#L59-L124
+-- Properly load file based plugins without blocking the UI
+function M.lazy_file()
+	M.use_lazy_file = M.use_lazy_file and vim.fn.argc(-1) > 0
+
+	-- Add support for the LazyFile event
+	local Event = require("lazy.core.handler.event")
+
+	if M.use_lazy_file then
+		-- We'll handle delayed execution of events ourselves
+		Event.mappings.LazyFile = { id = "LazyFile", event = "User", pattern = "LazyFile" }
+		Event.mappings["User LazyFile"] = Event.mappings.LazyFile
+	else
+		-- Don't delay execution of LazyFile events, but let lazy know about the mapping
+		Event.mappings.LazyFile = { id = "LazyFile", event = { "BufReadPost", "BufNewFile", "BufWritePre" } }
+		Event.mappings["User LazyFile"] = Event.mappings.LazyFile
+		return
+	end
+
+	local events = {} ---@type {event: string, buf: number, data?: any}[]
+
+	local done = false
+	local function load()
+		if #events == 0 or done then
+			return
+		end
+		done = true
+		vim.api.nvim_del_augroup_by_name("lazy_file")
+
+		---@type table<string,string[]>
+		local skips = {}
+		for _, event in ipairs(events) do
+			skips[event.event] = skips[event.event] or Event.get_augroups(event.event)
+		end
+
+		vim.api.nvim_exec_autocmds("User", { pattern = "LazyFile", modeline = false })
+		for _, event in ipairs(events) do
+			if vim.api.nvim_buf_is_valid(event.buf) then
+				Event.trigger({
+					event = event.event,
+					exclude = skips[event.event],
+					data = event.data,
+					buf = event.buf,
+				})
+				if vim.bo[event.buf].filetype then
+					Event.trigger({
+						event = "FileType",
+						buf = event.buf,
+					})
+				end
+			end
+		end
+		vim.api.nvim_exec_autocmds("CursorMoved", { modeline = false })
+		events = {}
+	end
+
+	-- schedule wrap so that nested autocmds are executed
+	-- and the UI can continue rendering without blocking
+	load = vim.schedule_wrap(load)
+
+	vim.api.nvim_create_autocmd(M.lazy_file_events, {
+		group = vim.api.nvim_create_augroup("lazy_file", { clear = true }),
+		callback = function(event)
+			table.insert(events, event)
+			load()
+		end,
+	})
+end
+-- >>
+
 return M