class FileFilter

# File lib/file_filter.rb, line 45
def self.check(dir_pattern, size_threshold: 1000, cust_judge: nil)
  FileFilter.new(
    dir_pattern,
    size_threshold: size_threshold,
    cust_judge: cust_judge,
    process_block:
    proc do |f|
      puts "filterd file: #{f}"
    end
  ).start
end

# File lib/file_filter.rb, line 57
def self.check_save_result(dir_pattern, save_file_name: 'filtered_file.txt',
                           size_threshold: 1000, cust_judge: nil)
  result_file = File.open(save_file_name, 'wt')
  FileFilter.new(
    dir_pattern,
    size_threshold: size_threshold,
    cust_judge: cust_judge,
    process_block:
    proc do |f|
      puts "filterd file: #{f}"
      result_file << f << "\n"
    end
  ).start
  result_file.close
end

# File lib/file_filter.rb, line 32
def self.delete(dir_pattern, size_threshold: 1000, cust_judge: nil)
  FileFilter.new(
    dir_pattern,
    size_threshold: size_threshold,
    cust_judge: cust_judge,
    process_block:
    proc do |f|
      puts "deleted file: #{f}"
      File.delete(f)
    end
  ).start
end

# File lib/file_filter.rb, line 5
def initialize(dir_pattern, size_threshold: 1000,
               cust_judge: nil, process_block: nil)
  @dir_pattern = dir_pattern
  @size_threshold = size_threshold
  @cust_judge = cust_judge ? cust_judge : method(:default_judge)
  @total = 0
  @process_block = process_block
end

# File lib/file_filter.rb, line 14
def default_judge(f)
  File.size(f) <= @size_threshold
end

# File lib/file_filter.rb, line 18
def filter_file(f)
  if @cust_judge.call(f)
    @total += 1
    @process_block.call(f)
  end
end

# File lib/file_filter.rb, line 25
def start
  Dir.glob(@dir_pattern) do |f|
    filter_file(f)
  end
  puts "total:#{@total}"
end