local userregs = require("vim.userregs")

-- Get format from g:timestamp_register_format or use fallback
local function get_timestamp_format()
  return vim.g.timestamp_register_format or "%Y-%m-%d %H:%M:%S"
end

local function generate_timestamp()
  local ok, result = pcall(os.date, get_timestamp_format())
  if not ok then
    vim.notify("[userregs] Invalid timestamp format", vim.log.levels.WARN)
    return os.date("%Y-%m-%d %H:%M:%S")
  end
  return result
end

userregs.register_handler('\20', {
  put = function()
    return generate_timestamp()
  end,
  yank = nil, -- read-only
})