find_ununsed_assets.rb

assets_path = File.expand_path("~/projects/rails/scout/public")
log_path = File.expand_path "~/assets.txt"
temp_requested_files_path = File.expand_path "~/processed_assets.txt"
ignore_pattern = /sparkline|datejs/

known_used =[
    "javascripts/jquery-1.7.1.min.js",
    "javascripts/jquery.extensions.js",
    "javascripts/application.js",
    "stylesheets/default.css",
    "stylesheets/public.css"
]

puts "starting"
Dir.chdir assets_path
files = %w(js png jpg jpeg gif css).map{|ext| Dir.glob("**/*.#{ext}")}.flatten
puts "Found #{files.size} assets"
requested_files =[]

if(File.exist? temp_requested_files_path)
  puts "#{temp_requested_files_path} exists -- using it"
  requested_files = File.readlines(temp_requested_files_path).map(&:chomp)
else
  puts "#{temp_requested_files_path} does not exist -- processing #{log_path}"
  log = File.readlines(log_path)
  puts "read #{log.size} lines from #{log_path}"
  log_entries=log.map{|l| l.match(/GET \/([^? ]+)/)[1]}
  requested_files = log_entries.uniq
  File.open(temp_requested_files_path,"w") {|f| f.puts requested_files}
end

puts "found #{requested_files.size} requested files in logs"
puts ""


puts "== Local files that aren't requested in production:"
res = files - requested_files
res = res.select{|l| !l.match ignore_pattern }
res = res - known_used
res.sort.each_with_index do |f,i|
  cmd = "rm #{assets_path}/#{f}"
  puts cmd
  # `#{cmd}` # only uncomment when you're satisfied with the list of files it's going to delete
end