Autosort alias block on elixir file save

autosort.lua

local function sort_alias_block(args)
  local bufnr = args.buf

  local saved_view
  vim.api.nvim_buf_call(bufnr, function()
    saved_view = vim.fn.winsaveview()
  end)

  local lines = vim.api.nvim_buf_get_lines(bufnr, 0, -1, false)
  local alias_start = nil
  local alias_end = nil

  for i, line in ipairs(lines) do
    if line:match("[%s\t]*alias%s+[A-Z]") then
      if not alias_start then
        alias_start = i - 1
      end
      alias_end = i - 1
    elseif alias_start and not line:match("[%s\t]*alias%s+[A-Z]") then
      break
    end
  end

  if alias_start and alias_end and alias_end > alias_start then
    local alias_lines = vim.api.nvim_buf_get_lines(bufnr, alias_start, alias_end + 1, false)
    table.sort(alias_lines)
    pcall(function()
      vim.cmd.undojoin()
      vim.api.nvim_buf_set_lines(bufnr, alias_start, alias_end + 1, false, alias_lines)
    end)
  end

  vim.api.nvim_buf_call(bufnr, function()
    vim.fn.winrestview(saved_view)
  end)
end