# Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import re

Import('env')

env = env.Clone(OPEN_VCDIFF_DIR='open-vcdiff')

cpppath = [
    '$OPEN_VCDIFF_DIR/src',
]

if env['PLATFORM'] == 'win32':
  cpppath.append('$OPEN_VCDIFF_DIR/vsprojects')

env.Prepend(CPPPATH = cpppath)

input_files = [
    '$OPEN_VCDIFF_DIR/src/addrcache.cc',
    '$OPEN_VCDIFF_DIR/src/adler32.c',
    '$OPEN_VCDIFF_DIR/src/blockhash.cc',
    '$OPEN_VCDIFF_DIR/src/codetable.cc',
    '$OPEN_VCDIFF_DIR/src/decodetable.cc',
    '$OPEN_VCDIFF_DIR/src/encodetable.cc',
    '$OPEN_VCDIFF_DIR/src/headerparser.cc',
    '$OPEN_VCDIFF_DIR/src/logging.cc',
    '$OPEN_VCDIFF_DIR/src/varint_bigendian.cc',
    '$OPEN_VCDIFF_DIR/src/vcdecoder.cc',
    '$OPEN_VCDIFF_DIR/src/vcdiffengine.cc',
]

env.ChromeStaticLibrary('sdch', input_files)

if env['PLATFORM'] in ('posix', 'darwin'):

  # Generate a target config.h file from a source config.h.in file.
  #
  # The list of defines has been taken empirically from Autoconf
  # (./configure) runs on Mac OS X and Ubuntu Hardy.

  defines = [
      'HAVE_DLFCN_H',
      'HAVE_FNMATCH_H',
      'HAVE_GETOPT_H',
      'HAVE_GETTIMEOFDAY',
      'HAVE_INTTYPES_H',
      'HAVE_MEMORY_H',
      'HAVE_MPROTECT',
      'HAVE_PTHREAD',
      'HAVE_STDINT_H',
      'HAVE_STDLIB_H',
      'HAVE_STRINGS_H',
      'HAVE_STRING_H',
      'HAVE_STRTOLL',
      'HAVE_STRTOQ',
      'HAVE_SYS_MMAN_H',
      'HAVE_SYS_STAT_H',
      'HAVE_SYS_TIME_H',
      'HAVE_SYS_TYPES_H',
      'HAVE_UINT16_T',
      'HAVE_UNISTD_H',
      'HAVE_U_INT16_T',
      'HAVE___ATTRIBUTE__',
      ('PACKAGE', '"open-vcdiff"'),
      ('PACKAGE_BUGREPORT', '"opensource@google.com"'),
      ('PACKAGE_NAME', '"open-vcdiff"'),
      ('PACKAGE_STRING', '"open-vcdiff 0.1"'),
      ('PACKAGE_TARNAME', '"open-vcdiff"'),
      ('PACKAGE_VERSION', '"0.1"'),
      ('VERSION', '"0.1"'),
      'STDC_HEADERS',
  ]

  if env['PLATFORM'] == 'posix':
    defines.extend([
        'HAVE_MALLOC_H',
        'HAVE_MEMALIGN',
        'HAVE_POSIX_MEMALIGN',
    ])

  if env['PLATFORM'] == 'darwin':
    defines.extend([
        'HAVE_WORKING_KQUEUE',
    ])

  def AutoConfig(target, source, env):
    """
    Action to generate a config.h file from an Autotools config.h.in file,
    given the list of definitions in the DEFINES construction variable.

    Each entry in DEFINES is either a string, in which case it
    will be enabled with a value of 1, or a tuple, in which case
    the first element is the #define name and the second its value.

    Any leftover #undef lines get commented out.
    """
    contents = open(str(source[0]), 'r').read()

    for d in env['DEFINES']:
        if isinstance(d, tuple):
            define, value = d
        else:
            define = d
            value = 1
        undef = '^#undef %s$' % re.escape(define)
        definition = '#define %s %s' % (define, value)
        contents = re.sub(undef, definition, contents)

    undef_re = re.compile(r'^(#undef .*)$', re.M)
    contents = undef_re.sub(r'/* \1 */', contents)

    header = '/* src/config.h.  Generated by SCons.  */\n'
    open(str(target[0]), 'w').write(header + contents)

  # varlist['DEFINES'] below makes the target config.h file depend
  # on the list of definitions in the passed-in $DEFINES variable.
  env.Command('$OPEN_VCDIFF_DIR/src/config.h',
              '$OPEN_VCDIFF_DIR/src/config.h.in',
              Action(AutoConfig, varlist=['DEFINES']),
              DEFINES=defines)