# build autodefs.h and 
 
 import re
 
 autogen = "Automatically generated by config.py"
 
 def parse_version_m4(kv, version_m4):
     r = re.compile(r'^define\((\w+),\[(.*)\]\)$')
     f = open(version_m4)
     for line in f:
         line = line.rstrip()
         m = re.match(r, line)
         if m:
             g = m.groups()
             kv[g[0]] = g[1]
     f.close()
 
 def parse_settings_in(kv, settings_in):
     r = re.compile(r'^!define\s+(\w+)(?:\s+"?(.*?)"?)$')
     f = open(settings_in)
     for line in f:
         line = line.rstrip()
         m = re.match(r, line)
         if m:
             g = m.groups()
             kv[g[0]] = g[1] or ''
     f.close()
 
 def build_autodefs(kv, autodefs_in, autodefs_out):
     def repfn(m):
         var, = m.groups()
         return kv.get(var, '')
 
     r = re.compile(r'@(\w+)@')
     fin = open(autodefs_in)
     fout = open(autodefs_out, 'w')
     fout.write("/* %s */\n\n" % autogen)
     for line in fin:
         newline = re.sub(r, repfn, line)
         fout.write(newline)
     fin.close()
     fout.close()
 
 def print_key_values(kv):
     for k, v in sorted(kv.items()):
         print "%s%s%s" % (k, ' '*(32-len(k)), repr(v))
 
 def get_sources(makefile_am):
     c = set()
     h = set()
     f = open(makefile_am)
     state = False
     for line in f:
         line = line.rstrip()
         if line == 'openvpn_SOURCES = \\':
             state = True
         elif not line:
             state = False
         elif state:
             for sf in line.split():
                 if sf.endswith('.c'):
                     c.add(sf[:-2])
                 elif sf.endswith('.h'):
                     h.add(sf[:-2])
                 elif sf == '\\':
                     pass
                 else:
                     print >>sys.stderr, "Unrecognized filename:", sf
     f.close()
     return [ sorted(list(s)) for s in (c, h) ]
 
 def output_mak_list(out, title, srclist, ext):
     out.write("%s =" % (title,))
     for x in srclist:
         out.write(" \\\n\t%s.%s" % (x, ext))
     out.write('\n\n')
 
 def output_mak(makefile_am, outfile):
     c, h = get_sources(makefile_am)
     out = open(outfile, 'w')
     out.write("# %s\n\n" % autogen)
     output_mak_list(out, 'HEADERS', h, 'h')
     output_mak_list(out, 'OBJS', c, 'obj')
     out.close()
 
 def main():
     kv = {}
     parse_version_m4(kv, 'version.m4')
     parse_settings_in(kv, 'install-win32/settings.in')
     build_autodefs(kv, 'msvc/autodefs.h.in', 'autodefs.h')
     output_mak('Makefile.am', 'head_obj.mak')
 
 main()