class String
  def message_quote
    quote = self.split("\n")
    body_quote = ''
    quote.each do |line|
      body_quote = body_quote + '> ' + line + "\n"
    end
    body_quote
  end
  def word_wrap(*args)
    options = args.extract_options!
    unless args.blank?
      options[:line_width] = args[0] || 82
    end
    options.reverse_merge!(:line_width => 82)

    lines = self
    lines.split("\n").collect do |line|
      line.length > options[:line_width] ? line.gsub(/(.{1,#{options[:line_width]}})(\s+|$)/, "\\1\n").strip : line
    end * "\n"
  end
  def to_filename
    camel_cased_word = self.to_s
    camel_cased_word.gsub(/::/, '/').downcase
  end

  # because of mysql inno_db limitations, strip 4 bytes utf8 chars (e. g. emojis)
  # unfortunaly UTF8mb4 will raise other limitaions of max varchar and lower index sizes
  # More details: http://pjambet.github.io/blog/emojis-and-mysql/
  def utf8_to_3bytesutf8
    return if ActiveRecord::Base.connection_config[:adapter] != 'mysql2'
    self.each_char.select {|c|
      if c.bytes.count > 3
        puts "WARNING: strip out 4 bytes utf8 chars '#{c}' of '#{ self }'"
        next
      end
      c
    }
    .join('')
  end

=begin

  text = html_string.html2text

=end

  # base from https://gist.github.com/petrblaho/657856
  def html2text
    text = self.
      gsub(/( |\n|\s)+/im, ' ').squeeze(' ').strip.
      gsub(/<([^\s]+)[^>]*(src|href)=\s*(.?)([^>\s]*)\3[^>]*>\4<\/\1>/i, '\4')

    links = []
    linkregex = /<[^>]*(src|href)=\s*(.?)([^>\s]*)\2[^>]*>\s*/i
    while linkregex.match(text)
      links << $~[3]
      text.sub!(linkregex, "[#{links.size}]")
    end

    text = CGI.unescapeHTML(
      text.
        gsub(/<(script|style)[^>]*>.*<\/\1>/im, '').
        gsub(/<!--.*-->/m, '').
        gsub(/<hr(| [^>]*)>/i, "___\n").
        gsub(/<li(| [^>]*)>/i, "\n* ").
        gsub(/<blockquote(| [^>]*)>/i, '> ').
        gsub(/<(br)(|\/| [^>]*)>/i, "\n").
        gsub(/<\/div(| [^>]*)>/i, "\n").
        gsub(/<(\/h[\d]+|p)(| [^>]*)>/i, "\n\n").
        gsub(/<[^>]*>/, '')
    ).lstrip.gsub(/\n[ ]+/, "\n") + "\n"

    for i in (0...links.size).to_a
      text = text + "\n  [#{i+1}] <#{CGI.unescapeHTML(links[i])}>" unless links[i].nil?
    end
    links = nil
    text.chomp
  end

=begin

  html = text_string.text2html

=end

  def text2html
    text = CGI.escapeHTML( self )
    text.gsub!(/\n/, '<br>')
    text.chomp
  end

end