module AdjustN

# File lib/adjustn/singleton_class.rb, line 8
def run(after_code, *pathnames)
  raise ArgumentError unless pathnames.length >= 1

  before, after = *pair_for(after_code)

  pathnames.each do |pathname|
    source = File.binread(pathname)

    if output = gsub_for!(source, before, after)
      File.open(pathname, 'wb') do |f|
        f << output
      end
    else
      $stderr.puts %Q!Already adjuted the file "#{pathname}"!
    end
  end
end

# File lib/adjustn/singleton_class.rb, line 36
def gsub_for!(source, before, after)
  source.gsub!(before) { after }
end

# File lib/adjustn/singleton_class.rb, line 29
def pair_for(want)
  want = NewlineChar.autonym(want)
  NewlineChar::PAIRS.fetch(want)
end