#!/usr/bin/ruby
# frozen_string_literal: true

arg = ARGV[0]
val = if arg.nil?
        $stdin.read
      else
        File.read(arg)
      end

d = (val.gsub(/(?<=\s)".*?"/) do |i|
  "“#{i[1..-2]}”"
end).gsub(/\s*”\s*([,.?!])/, '\\1”').gsub(/([ \t])[ \t]+/, '\\1').gsub(/\n\n\n*/, "\n\n").strip

if arg.nil?
  print d
else
  File.write arg, d
end