#!/usr/bin/ruby -w
=begin
This approach doesn't work well when the options found can differ by platform.

At least for defines, there need to be ifdef guards around them. PF_ defines, for example, vary
across libc.
=end

pattern = ARGV.shift

RXDEF = %r{^\s*(?:[#]\s*define)?\s*#{pattern}_(\w+)(.*)}
RXDOC = %r{/[/*](.*)}


OPTS = []

ARGF.each do |line|
  next unless line =~ RXDEF

  name = $1
  doc  = nil

  if $2 =~ RXDOC
    doc = $1.gsub(/\*\/.*/, "").strip
  end

  #p [name, doc, line]

  next if name == "MAX"

  cname = pattern + "_" + name
  lname = name.gsub(/_/, "-").downcase

=begin
Catch cases like:

enum
  {
      IPPROTO_IP = 0,        /* Dummy protocol for TCP.  */
#define IPPROTO_IP              IPPROTO_IP
=end

  if OPTS.last and OPTS.last[1] == cname
    if not OPTS.last[2]
      OPTS.last[2] = doc
    end
    next
  end

  OPTS << [lname, cname, doc]

  #p OPTS.last
end

width = 10

OPTS.each do |lname, cname, doc|
  if lname.size > width
    width = lname.size + 2
  end
end

puts "-- DOCUMENTATION"

OPTS.each do |lname, cname, doc|
  line = "  #{lname}#{" " * (width - lname.size)}-- #{cname}"
  if doc
    line << ", #{doc}"
  end
  puts line
end

puts""
puts""

puts "static const char* " + pattern + "_opts[] = {"

OPTS.each do |lname, cname, doc|
  puts "  #{lname.inspect},"
end
puts "  NULL"
puts "};"

puts "static int " + pattern + "_vals[] = {"
OPTS.each do |lname, cname, doc|
  puts "  #{cname},"
end
puts "};"
puts "static int " + pattern + "_vals_size = " + OPTS.size.to_s + ";" # cvt to sizeof(pattern _vals) / sizeof(pattern _vals[0])

puts <<__
static int check_#{pattern}(lua_State* L, int argn)
{
  int opt = luaL_checkoption(L, argn, NULL /* default? */, #{pattern}_opts);
  int val = #{pattern}_vals[opt];
  return val;
}
__