zen.lua

local function save_opts()
  original_opts = vim.o
end

local function hide_stuff()
  vim.o.fillchars = "stl: ,stlnc: ,vert: ,diff: ,msgsep: ,eob: ,horiz: ,horizup: ,horizdown: "
  vim.o.number = false
  vim.o.relativenumber = false
  vim.o.showtabline=0
end
local function resize_pads()
  local ui = vim.api.nvim_list_uis()[1]
  local width = ui.width
  local height = ui.height

  local padding_width = math.floor((width / 2 ) / 2)

  for pos, id in pairs(vim.t.padding) do
    if pos == "l" or pos == "r" then
      api.nvim_win_set_width(vim.t.padding[pos].winId, padding_width)
    end
    if pos == "t" or pos == "b" then
      api.nvim_win_set_height(vim.t.padding[pos].winId, 0)
    end
  end
end
local function init_pad(command)
  vim.cmd(command)
  vim.bo.buftype = "nofile"
  vim.bo.bufhidden = "wipe"
  vim.bo.modifiable = false
  vim.bo.buflisted = false
  vim.bo.swapfile = false
  vim.wo.number = false
  vim.wo.relativenumber = false
  vim.wo.cursorline = false
  vim.wo.cursorcolumn = false
  vim.wo.winfixwidth = true
  vim.wo.winfixheight = true
  vim.wo.statusline = ""

  local bufnr = api.nvim_get_current_buf()
  local winId = api.nvim_get_current_win()

  vim.api.nvim_create_autocmd({ "CursorMoved", "WinEnter" }, {
    buffer = bufnr,
    nested = true,
    callback = function(ev)
      vim.api.nvim_set_current_win(vim.t.main.winId)
    end,
  })

    vim.api.nvim_set_current_win(vim.t.main.winId)
  return {winId = winId, bufnr=bufnr}
end

local function toggle_off()
  vim.o = original_opts
  vim.cmd("tabclose")
end
local function toggle_on()
  save_opts()
  local origina_tab = vim.fn.tabpagenr()
  vim.cmd("tab split")
  vim.t.main = {
    bufnr = api.nvim_get_current_buf(),
    winId = api.nvim_get_current_win(),
  }
  vim.t.padding = {
    l = init_pad("vertical topleft new"),
    r = init_pad("vertical botright new"),
    t = init_pad("topleft new"),
    b = init_pad("botright new"),
  }
  resize_pads()
  hide_stuff()
end
vim.api.nvim_create_user_command("Zen", function()
  if vim.g.zen_enabled then
    toggle_off()
    vim.g.zen_enabled = false
  else
    toggle_on()
    vim.g.zen_enabled = true
  end
end, {})