module FileCleaner

# File lib/file_cleaner.rb, line 4
def self.remove args
  file_path = args[:file_path]
  pattern = args[:pattern]
  range = args.fetch(:range, 0..0)

  lines = []
  File.open(file_path, 'r') do |f|
    lines = f.readlines
  end

  match_indexes = lines.each_with_index.select { |line,_| line =~ pattern }.map { |_, index| index }
  match_indexes.each do |match_index|
    moved_range = Range.new(range.begin + match_index, range.end + match_index, range.exclude_end?)
    lines.fill(nil, moved_range)
  end
  result = lines.compact

  File.open(file_path, 'w+') do |f|
    result.each do |line|
      f.write line
    end
  end
end