Redmine

        content = read_file_head

        separator = [',', ';'].max_by {|sep| content.count(sep)}

        wrapper = ['"', "'"].max_by {|quote_char| content.count(quote_char)}

        guessed_encoding = Redmine::CodesetUtil.guess_encoding(content)

    self.settings.merge!(

      'separator' => separator,

      'wrapper' => wrapper,

      'encoding' => encoding,

      'date_format' => date_format,

    csv_options[:encoding] = 'bom|UTF-8' if csv_options[:encoding] == 'UTF-8'

    separator = settings['separator'].to_s

    csv_options[:col_sep] = separator if separator.size == 1

    wrapper = settings['wrapper'].to_s

    csv_options[:quote_char] = wrapper if wrapper.size == 1