sync

#!/usr/bin/env ruby
require 'open-uri'

# Attempt to load the 'listen' gem
listen_loaded = begin
  require 'listen'
  true
rescue LoadError
  false
end

# URL of the text file and the base CSS file
url = 'https://raw.githubusercontent.com/easylist/easylist/master/fanboy-addon/fanboy_annoyance_general_hide.txt'
base_file = 'base.css'
output_file = 'adblock.css'

# Function to minify CSS content
def minify_css(content)
  content.gsub(/\/\*.*?\*\//m, '')
        .gsub(/\s+/, ' ')
        .gsub(/\s*{\s*/, '{')
        .gsub(/\s*}\s*/, '}')
        .gsub(/\s*;\s*/, ';')
        .gsub(/;\s*}/, '}')
end

def generate_css(url, base_file, output_file)
  base_content = File.read(base_file)
  minified_base_content = minify_css(base_content)

  selectors = []
  OpenURI.open_uri(url) do |file|
    file.each_line do |line|
      next if line.start_with?('!') || line.strip.empty?
      selector = line.strip.gsub(/^#+/, '')
      selectors << selector
    end
  end

  combined_selectors = selectors.join(', ')
  minified_css_rule = "#{combined_selectors} {display: none !important;visibility: invisible !important;}"

  File.open(output_file, 'w') do |output|
    output.puts "/* auto generated with ./sync - do not edit */"
    output.puts minified_base_content
    output.puts minify_css(minified_css_rule)
  end

  puts "CSS file generated: #{output_file}"
end

def watch_file(url, base_file, output_file, listen_loaded)
  if listen_loaded
    current_dir = File.dirname(__FILE__)
    listener = Listen.to(current_dir) do |modified, added, removed|
      if (modified + added).any? { |n| n.include?(base_file) }
        puts "#{base_file} has changed. Regenerating #{output_file}."
        generate_css(url, base_file, output_file)
      end
    end
    listener.start
    puts "Listening for changes in #{base_file}..."
    sleep
  else
    generate_css(url, base_file, output_file)
    puts "CSS file generated: #{output_file}"
    puts "Notice: to use --sync you must gem install listen"
  end
end

if ARGV.include?('--watch')
  watch_file(url, base_file, output_file, listen_loaded)
else
  generate_css(url, base_file, output_file)
end