Find dupes that Apple's "Image Capture.app" is creating when importing photos from my camera, & move to trash. Compare dupes to the previous dupe (or original) via md5.

trash_image_capture_dupes.rb

require 'digest'

def filenames
  Dir.entries('.').sort
end

def digest filename
  Digest::MD5.hexdigest File.read(filename)
end

def md5_matches? file1, file2
  filenames.include?(file1) &&
    filenames.include?(file2) &&
    File.file?(file2) &&
    digest(file1) == digest(file2)
end

def delete_if_dupe number, dupes_dir = Dir.pwd
  if dupes_dir
    begin
      Dir.chdir dupes_dir
    rescue SystemCallError
      puts "Pass in a legit directory. You passed in '#{dupes_dir}'."
      return
    end
  end

  if filenames.grep(/IMG_\d{4}\.JPG/).empty?
    puts "No pics in here"
    return
  end

  puts "There are #{filenames.count} files in here."

  suspect_pattern = Regexp.new("IMG.* #{number}.JPG")
  suspects = filenames.grep suspect_pattern
  puts "There are #{suspects.count} suspects in here."

  predecessor_for = ->(suspect) {
    if number == 1
      # "IMG_0123 1.JPG"
      suspect[0..7] + ".JPG"
    else
      suspect[0..8] + "#{number - 1}.JPG"
    end
  }

  # `brew info trash`: https://hasseg.org/trash/
  survivors = 0
  suspects.each do |suspect|
    predecessor = predecessor_for[suspect]
    if md5_matches?(suspect, predecessor)
      `trash "#{suspect}"`
    else
      survivors += 1
      puts "Whew! #{suspect} escapes... for now...."
    end
  end
  puts "Now, there are #{filenames.count} files left. There were #{survivors} survivors."
end