# Copyright (c) 2013, 2015-2020 ARM Limited
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#
# Copyright (c) 2011 Advanced Micro Devices, Inc.
# Copyright (c) 2009 The Hewlett-Packard Development Company
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import os.path

from gem5_scons import Transform, MakeAction

###################################################
#
# This builder and wrapper method are used to set up a directory with
# switching headers. Those are headers which are in a generic location and
# that include more specific headers from a directory chosen at build time
# based on the current build settings.
#
###################################################

def SwitchingHeaders(env):
    def build_switching_header(target, source, env):
        path = str(target[0])
        subdir = str(source[0])
        dp, fp = os.path.split(path)
        dp = os.path.relpath(os.path.realpath(dp),
                             os.path.realpath(env['BUILDDIR']))
        with open(path, 'w') as hdr:
            print('#include "%s/%s/%s"' % (dp, subdir, fp), file=hdr)

    switching_header_action = MakeAction(build_switching_header,
                                         Transform('GENERATE'))

    switching_header_builder = env.Builder(action=switching_header_action,
                                           source_factory=env.Value,
                                           single_source=True)

    env.Append(BUILDERS = { 'SwitchingHeader': switching_header_builder })

    def switching_headers(self, headers, source):
        for header in headers:
            self.SwitchingHeader(header, source)

    env.AddMethod(switching_headers, 'SwitchingHeaders')