Add python script to generate dvr api header for exporting

#!/usr/bin/python

import sys

import os

import argparse

# Run this script to generate dvr_api.h in the current directory.

def make_argument_parser():

  parser = argparse.ArgumentParser(

      description='Process DVR API headers into exportable SDK files.')

  return parser

parser = make_argument_parser()

in_file = open("include/dvr/dvr_api.h", "r")

out_file = open("./dvr_api.h", "w")

h_filename = ""

for line in in_file:

  if line.startswith("// dvr_") and line.endswith(".h\n"):

    h_filename = "include/dvr/" + line[3:].strip()

  if line.startswith("typedef ") and "(*Dvr" in line:

    start = line.find("(*Dvr") + 5

    end = line.find("Ptr)")

    if end != -1:

      name = "dvr" + line[start:end]

      # Find the comments for this function and insert into output.

      with open(h_filename, 'r') as h_file:

        h_lines = h_file.readlines()

        i = 1

        while i < len(h_lines):

          if name in h_lines[i]:

            end_i = i

            while h_lines[i - 1].startswith("//"): i -= 1

            while i < end_i:

              out_file.write(h_lines[i])

              i += 1

            break

          i += 1

  if line.startswith('#include "dvr_api_entries.h"'):

    with open("include/dvr/dvr_api_entries.h") as f:

      out_file.write(f.read())

  else:

    out_file.write(line)

in_file.close()

out_file.close()