fix-1760.sed

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#########
# Fix for https://github.com/GoogleCloudPlatform/gcloud-python/issues/1760
# if this doesn't get me around the CLA, then it has at least taught me how to
# use sed.
#
# Usage:
#   cp gcloud/streaming/transfer.py{,.bak}
#   sed -f fix-1760.sed gcloud/streaming/transfer.py.bak \
#       > gcloud/streaming/transfer.py
#
# Add email_generator_class
/import acceptable_mime_type/a\
\
if six.PY3:\
    email_generator_class = email_generator.BytesGenerator\
else:\
    email_generator_class = email_generator.Generator
/^class _Transfer/Mi\
def ensure_bytes(str_or_bytes):\
    if six.PY3:\
        if isinstance(str_or_bytes, str):\
            return str_or_bytes.encode('utf-8')\
        elif isinstance(str_or_bytes, bytes):\
            return str_or_bytes\
    else:\
        if isinstance(str_or_bytes, str):\
            return str_or_bytes\
\
    raise TypeError('Could not be coerced into bytes:', type(str_or_bytes))\
\

# In: _configure_multipart_request:
/^    def _configure_multipart_request/,/^    def/{
# - Use email_generator_class
s/\(generator = email_generator\).Generator/\1_class/
# - Use six.BytesIO
s/\(stream = \)six.StringIO/\1six.BytesIO/

# - Add binary version of multipart_boundary
/multipart_boundary = /{
h
s/^\(\s*\).*/\1/
H
g
s/$/multipart_boundary_bytes = ensure_bytes(multipart_boundary)/
}

# - Replace all following multipart_boundary{,_bytes}
/body_components = /,/\n\s*def /{
/multipart_boundary_/!s/multipart_boundary/\0_bytes/g
s/\('[^.]*\?\)'/b\0/g
}
}