class Fbe::Award::Bylaw

def initialize
  @lines = []
  @intro = ''
  @lets = {}
end

def intro(text)
  @intro = text
end

def let(key, value)
  @lets[key] = value
end

def line(line)
  line = line.gsub(/\$\{([a-z_0-9]+)\}/) { |_x| "**#{@lets[Regexp.last_match[1].to_sym]}**" }
  @lines << line
end

def markdown
  pars = []
  pars << "#{@intro}." unless @intro.empty?
  pars << 'Here is how it\'s calculated:'
  if @lines.size == 1
    pars << "Just #{@lines.first}."
  else
    pars += @lines.each_with_index.map { |t, i| "#{i.zero? ? 'First' : 'Then'}, #{t}." }
  end
  pars.join(' ').gsub('. Then, award ', ', and award ').gsub(/\s{2,}/, ' ')
end

def revert(num)
  @lines.slice!(-num, num)
end