#! /usr/bin/env python3

# Add some standard cpp magic to a header file

import sys

def main():
 args = sys.argv[1:]
 for filename in args:
 process(filename)

def process(filename):
 try:
 f = open(filename, 'r')
 except IOError as msg:
 sys.stderr.write('%s: can\'t open: %s\n' % (filename, str(msg)))
 return
 with f:
 data = f.read()
 if data[:2] != '/*':
 sys.stderr.write('%s does not begin with C comment\n' % filename)
 return
 try:
 f = open(filename, 'w')
 except IOError as msg:
 sys.stderr.write('%s: can\'t write: %s\n' % (filename, str(msg)))
 return
 with f:
 sys.stderr.write('Processing %s ...\n' % filename)
 magic = 'Py_'
 for c in filename:
 if ord(c)<=0x80 and c.isalnum():
 magic = magic + c.upper()
 else: magic = magic + '_'
 print('#ifndef', magic, file=f)
 print('#define', magic, file=f)
 print('#ifdef __cplusplus', file=f)
 print('extern "C" {', file=f)
 print('#endif', file=f)
 print(file=f)
 f.write(data)
 print(file=f)
 print('#ifdef __cplusplus', file=f)
 print('}', file=f)
 print('#endif', file=f)
 print('#endif /*', '!'+magic, '*/', file=f)

if __name__ == '__main__':
 main()