#!/usr/bin/env ruby

# convert indented itpn packets (validated/canonical form) to markdown

indent_width = 2
heading_depth = 0

def read_packets(io)
  packets = []
  current = []
  io.each_line do |raw|
    line = raw.chomp
    next if line.empty?
    if line[/\A */].size == 0 && !current.empty?
      packets << current
      current = []
    end
    current << line
  end
  packets << current unless current.empty?
  packets
end

def packet_to_markdown(packet, indent_width, heading_depth)
  packet.map do |line|
    spaces = line[/\A */].size
    level = spaces / indent_width
    text = line.lstrip
    if level < heading_depth
      "#" * (level + 1) + " " + text
    else
      ("  " * (level - heading_depth)) + "* " + text
    end
  end.join("\n")
end

files = ARGV.empty? ? ["-"] : ARGV
files.each do |path|
  io = path == "-" ? STDIN : File.open(path, "r")
  read_packets(io).each do |packet|
    puts packet_to_markdown(packet, indent_width, heading_depth)
    puts
  end
  io.close unless path == "-"
end