neovim/lua/autocmd.lua

local myAutoGroup = vim.api.nvim_create_augroup("myAutoGroup", {
    clear = true,
  })
  
  local autocmd = vim.api.nvim_create_autocmd

  -- 修改lua/plugins.lua 自动更新插件
  autocmd("BufWritePost", {
    group = myAutoGroup,
    -- autocmd BufWritePost plugins.lua source <afile> | PackerSync
    callback = function()
      if vim.fn.expand("<afile>") == "lua/plugins.lua" then
        vim.api.nvim_command("source lua/plugins.lua")
        vim.api.nvim_command("PackerSync")
      end
    end,
  })