global

def process_kramdown_options(coding_override = nil,
                             smart_quotes = nil, typographic_symbols = nil,
                             header_kramdown_options = nil)

  ascii_target = coding_override && coding_override =~ /ascii/
  suppress_typography = ascii_target || $options.v3
  entity_output = ascii_target ? :numeric : :as_char;

  options = {input: 'RFC2629Kramdown', entity_output: entity_output, link_defs: {}}

  if smart_quotes.nil? && suppress_typography
    smart_quotes = false
  end
  if smart_quotes == false
    smart_quotes = ["'".ord, "'".ord, '"'.ord, '"'.ord]
  end
  case smart_quotes
  when Array
    options[:smart_quotes] = smart_quotes
  when nil, true
    # nothin
  else
    warn "*** Can't deal with smart_quotes value #{smart_quotes.inspect}"
  end

  if typographic_symbols.nil? && suppress_typography
    typographic_symbols = false
  end
  if typographic_symbols == false
    typographic_symbols = Hash[::Kramdown::Parser::Kramdown::TYPOGRAPHIC_SYMS.map { |k, v|
                                 if Symbol === v
                                   [v.intern, k]
                                 end
                               }.compact]
  end
  # warn [:TYPOGRAPHIC_SYMBOLS, typographic_symbols].to_yaml
  case typographic_symbols
  when Hash
    options[:typographic_symbols] = typographic_symbols
  when nil, true
    # nothin
  else
    warn "*** Can't deal with typographic_symbols value #{typographic_symbols.inspect}"
  end

  if header_kramdown_options
    options.merge! header_kramdown_options
  end

  $global_markdown_options = options   # For nested calls in bibref annotation processing and xref text

  options
end