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import os
from typing import Optional
from .config import Configuration
from .utils import trace
from .version import meta
from .version import ScmVersion
PRETEND_KEY = "SETUPTOOLS_SCM_PRETEND_VERSION"
PRETEND_KEY_NAMED = PRETEND_KEY + "_FOR_{name}"
def _read_pretended_version_for(config: Configuration) -> Optional[ScmVersion]:
"""read a a overridden version from the environment
tries ``SETUPTOOLS_SCM_PRETEND_VERSION``
and ``SETUPTOOLS_SCM_PRETEND_VERSION_FOR_$UPPERCASE_DIST_NAME``
"""
trace("dist name:", config.dist_name)
pretended: Optional[str]
if config.dist_name is not None:
pretended = os.environ.get(
PRETEND_KEY_NAMED.format(name=config.dist_name.upper())
)
else:
pretended = None
if pretended is None:
pretended = os.environ.get(PRETEND_KEY)
if pretended:
# we use meta here since the pretended version
# must adhere to the pep to begin with
return meta(tag=pretended, preformatted=True, config=config)
else:
return None
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