def truncate(text, truncate_at = DEFAULT_LENGTH, options = {})
      if truncate_at.is_a?(Hash)
        options = truncate_at
        truncate_at = DEFAULT_LENGTH
      end

      if display_width(text) <= truncate_at.to_i || truncate_at.to_i.zero?
        return text.dup
      end

      trail      = options.fetch(:trailing) { DEFAULT_TRAILING }
      separation = options.fetch(:separator) { nil }
      sanitized_text = Strings::ANSI.sanitize(text)

      length_without_trailing = truncate_at - display_width(trail)
      chars = to_chars(sanitized_text).to_a
      stop  = chars[0, length_without_trailing].rindex(separation)
      slice_length = stop || length_without_trailing
      sliced_chars = chars[0, slice_length]
      original_chars = to_chars(text).to_a[0, 3 * slice_length]
      shorten(original_chars, sliced_chars, length_without_trailing).join + trail
    end
def truncate(text, truncate_at = DEFAULT_LENGTH, options = {})
      if truncate_at.is_a?(Hash)
        options = truncate_at
        truncate_at = DEFAULT_LENGTH
      end

      if display_width(text) <= truncate_at.to_i || truncate_at.to_i.zero?
        return text.dup
      end

      trail      = options.fetch(:trailing) { DEFAULT_TRAILING }
      separation = options.fetch(:separator) { nil }
      sanitized_text = Strings::ANSI.sanitize(text)

      length_without_trailing = truncate_at - display_width(trail)
      chars = to_chars(sanitized_text).to_a
      stop  = chars[0, length_without_trailing].rindex(separation)
      slice_length = stop || length_without_trailing
      sliced_chars = chars[0, slice_length]
      original_chars = to_chars(text).to_a[0, 3 * slice_length]
      shorten(original_chars, sliced_chars, length_without_trailing).join + trail
    end
Truncate a text at a given length (defualts to 30)

 @param [String] text
   the text to be truncated

 @param [Integer] truncate_at
   the width at which to truncate the text

 @param [Hash] options
   @option options [Symbol] :separator the character for splitting words
   @option options [Symbol] :trailing  the character for ending sentence

 @example
   text = "The sovereignest thing on earth is parmacetti for an inward bruise."

   Strings::Truncate.truncate(text)
   # => "The sovereignest thing on ear…"

   Strings::Truncate.truncate(text, 20)
   # => "The sovereignest th…"

   Strings::Truncate.truncate(text, 20, separator: ' ' )
   # => "The sovereignest…"

   Strings::Truncate.truncate(40, trailing: '... (see more)' )
   # => "The sovereignest thing on... (see more)"

 @api public