# frozen_string_literal: true

module MuchSlug; end

module MuchSlug::Slug
  def self.new(string, preprocessor:, separator:, allow_underscores: true)
    regexp_escaped_sep = Regexp.escape(separator)

    slug = preprocessor.call(string.to_s.dup)
    # Turn unwanted chars into the separator
    slug.gsub!(/[^\w#{regexp_escaped_sep}]+/, separator)
    # Turn underscores into the separator, unless allowing
    slug.gsub!(/_/, separator) unless allow_underscores
    # No more than one of the separator in a row.
    slug.gsub!(/#{regexp_escaped_sep}{2,}/, separator)
    # Remove leading/trailing separator.
    slug.gsub!(/\A#{regexp_escaped_sep}|#{regexp_escaped_sep}\z/, "")
    slug
  end
end