xc-unused-images.rb

#!/usr/bin/env ruby

# get all the file names we are interested in
source_filenames = Dir['**/*.m']
source_filenames.concat( Dir['**/*.xib'] )

png_filenames = Dir['**/*.png']

image_references = Hash.new
png_filenames.each { |filename| image_references[File.basename(filename.downcase)] = 0 }

# find all references to images in souces
source_filenames.each do |filename|
  begin
    file = File.open(filename, 'r')
    contents = file.read.downcase
    png_filenames.each do |image_filename|
      base_image_filename = File.basename(image_filename).downcase
      if contents.index(base_image_filename) != nil
        image_references[base_image_filename] += 1
      end
    end
    file.close
  rescue
    puts "Error opening #{filename}\n"
  end
end

# show results
unused_image_count = 0
image_references.each  do |filename,refcount| 
  if refcount == 0 
    puts "#{filename}\n" 
    unused_image_count += 1
  end
end

puts "  #{unused_image_count} unreferenced images out of #{png_filenames.count}.\n"