def from_environment(name, prefix, no_builds=False, ignore_channels=False, from_history=False):
"""
Get environment object from prefix
Args:
name: The name of environment
prefix: The path of prefix
no_builds: Whether has build requirement
ignore_channels: whether ignore_channels
from_history: Whether environment file should be based on explicit specs in history
Returns: Environment object
"""
# requested_specs_map = History(prefix).get_requested_specs_map()
if from_history:
history = History(prefix).get_requested_specs_map()
deps = [str(package) for package in history.values()]
return Environment(name=name, dependencies=deps, channels=list(context.channels),
prefix=prefix)
pd = PrefixData(prefix, pip_interop_enabled=True)
precs = tuple(PrefixGraph(pd.iter_records()).graph)
grouped_precs = groupby(lambda x: x.package_type, precs)
conda_precs = sorted(concatv(
grouped_precs.get(None, ()),
grouped_precs.get(PackageType.NOARCH_GENERIC, ()),
grouped_precs.get(PackageType.NOARCH_PYTHON, ()),
), key=lambda x: x.name)
pip_precs = sorted(concatv(
grouped_precs.get(PackageType.VIRTUAL_PYTHON_WHEEL, ()),
grouped_precs.get(PackageType.VIRTUAL_PYTHON_EGG_MANAGEABLE, ()),
grouped_precs.get(PackageType.VIRTUAL_PYTHON_EGG_UNMANAGEABLE, ()),
# grouped_precs.get(PackageType.SHADOW_PYTHON_EGG_LINK, ()),
), key=lambda x: x.name)
if no_builds:
dependencies = ['='.join((a.name, a.version)) for a in conda_precs]
else:
dependencies = ['='.join((a.name, a.version, a.build)) for a in conda_precs]
if pip_precs:
dependencies.append({'pip': ["%s==%s" % (a.name, a.version) for a in pip_precs]})
channels = list(context.channels)
if not ignore_channels:
for prec in conda_precs:
canonical_name = prec.channel.canonical_name
if canonical_name not in channels:
channels.insert(0, canonical_name)
return Environment(name=name, dependencies=dependencies, channels=channels, prefix=prefix)
