#!/usr/bin/env python3
 
 
 import collections
 import subprocess
 import re
 
 
 def run(*args):
     return subprocess.run(args, stdout=subprocess.PIPE).stdout.decode()
 
 def info():
     info = dict()
     re_extension = re.compile(r'^(\w+):')
     re_function  = re.compile(r'^  (\w+):')
     lines = run('glewinfo')
     for line in lines.splitlines():
         match = re_extension.match(line)
         if match:
             extension = match.group(1)
             continue
         match = re_function.match(line)
         if match:
             info[match.group(1)] = extension
             continue
     return info
 
 def compat(info):
     compat = collections.defaultdict(lambda: collections.defaultdict(list))
     lines = run('grep', '-RIon', '--exclude-dir=.git', '-E', r'\<gl[A-Z]\w+\>')
     for line in lines.splitlines():
         file, line_nr, function = line.split(':')
         location = f'{file}:{line_nr}'
         extension = info.get(function, 'NOT_FOUND')
         compat[extension][function].append(location)
     return compat
 
 def report(compat, with_locations):
     for extension, functions in sorted(compat.items()):
         print(f'{extension}')
         for function, locations in sorted(functions.items()):
             print(f'  {function}')
             if with_locations:
                 for location in locations:
                     print(f'    {location}')
 
 def main():
     c = compat(info())
     report(c, False)
     print('')
     report(c, True)
 
 
 if __name__ == '__main__':
     main()