#!/usr/bin/env python3

"""This script splits httplib.h into .h and .cc parts."""

import argparse
import os
import sys

border = '// ----------------------------------------------------------------------------'

args_parser = argparse.ArgumentParser(description=__doc__)
args_parser.add_argument(
 "-e", "--extension", help="extension of the implementation file (default: cc)",
 default="cc"
)
args_parser.add_argument(
 "-o", "--out", help="where to write the files (default: out)", default="out"
)
args = args_parser.parse_args()

cur_dir = os.path.dirname(sys.argv[0])
lib_name = 'httplib'
header_name = '/' + lib_name + '.h'
source_name = '/' + lib_name + '.' + args.extension
# get the input file
in_file = cur_dir + header_name
# get the output file
h_out = args.out + header_name
cc_out = args.out + source_name

# if the modification time of the out file is after the in file,
# don't split (as it is already finished)
do_split = True

if os.path.exists(h_out):
 in_time = os.path.getmtime(in_file)
 out_time = os.path.getmtime(h_out)
 do_split = in_time > out_time

if do_split:
 with open(in_file) as f:
 lines = f.readlines()

 python_version = sys.version_info[0]
 if python_version < 3:
 os.makedirs(args.out)
 else:
 os.makedirs(args.out, exist_ok=True)

 in_implementation = False
 cc_out = args.out + source_name
 with open(h_out, 'w') as fh, open(cc_out, 'w') as fc:
 fc.write('#include "httplib.h"\n')
 fc.write('namespace httplib {\n')
 for line in lines:
 is_border_line = border in line
 if is_border_line:
 in_implementation = not in_implementation
 elif in_implementation:
 fc.write(line.replace('inline ', ''))
 else:
 fh.write(line)
 fc.write('} // namespace httplib\n')

 print("Wrote {} and {}".format(h_out, cc_out))
else:
 print("{} and {} are up to date".format(h_out, cc_out))