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**deprecated** -- The `Feature` facility was never completely implemented
or supported, `has reported issues
<https://github.com/pypa/setuptools/issues/58>`_ and will be removed in
a future version.
A subset of the distribution that can be excluded if unneeded/wanted
Features are created using these keyword arguments:
'description' -- a short, human readable description of the feature, to
be used in error messages, and option help messages.
'standard' -- if true, the feature is included by default if it is
available on the current system. Otherwise, the feature is only
included if requested via a command line '--with-X' option, or if
another included feature requires it. The default setting is 'False'.
'available' -- if true, the feature is available for installation on the
current system. The default setting is 'True'.
'optional' -- if true, the feature's inclusion can be controlled from the
command line, using the '--with-X' or '--without-X' options. If
false, the feature's inclusion status is determined automatically,
based on 'availabile', 'standard', and whether any other feature
requires it. The default setting is 'True'.
'require_features' -- a string or sequence of strings naming features
that should also be included if this feature is included. Defaults to
empty list. May also contain 'Require' objects that should be
added/removed from the distribution.
'remove' -- a string or list of strings naming packages to be removed
from the distribution if this feature is *not* included. If the
feature *is* included, this argument is ignored. This argument exists
to support removing features that "crosscut" a distribution, such as
defining a 'tests' feature that removes all the 'tests' subpackages
provided by other features. The default for this argument is an empty
list. (Note: the named package(s) or modules must exist in the base
distribution when the 'setup()' function is initially called.)
other keywords -- any other keyword arguments are saved, and passed to
the distribution's 'include()' and 'exclude()' methods when the
feature is included or excluded, respectively. So, for example, you
could pass 'packages=["a","b"]' to cause packages 'a' and 'b' to be
added or removed from the distribution as appropriate.
A feature must include at least one 'requires', 'remove', or other
keyword argument. Otherwise, it can't affect the distribution in any way.
Note also that you can subclass 'Feature' to create your own specialized
feature types that modify the distribution in other ways when included or
excluded. See the docstrings for the various methods here for more detail.
Aside from the methods, the only feature attributes that distributions look
at are 'description' and 'optional'.
c C s d} t j| tdd d S )NzrFeatures are deprecated and will be removed in a future version. See https://github.com/pypa/setuptools/issues/65. )
stacklevel)r r r )msgr r r r s zFeature.warn_deprecatedFTc K s | j || _|| _|| _|| _t|ttfr4|f}dd |D | _dd |D }|r^||d< t|trn|f}|| _ || _
| r| r| rt dd S )Nc S s g | ]}t |tr|qS r )r` rh )r~ r r r r r s z$Feature.__init__.<locals>.<listcomp>c S s g | ]}t |ts|qS r )r` rh )r~ r r r r r s ry zgFeature %s: must define 'require_features', 'remove', or at least one of 'packages', 'py_modules', etc.) r r standard availabler r` rh r ry removeextrasr ) r5 r r r r ry r r Zerr r r r s$
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| jS )z+Should this feature be included by default?)r r )r5 r r r r s zFeature.include_by_defaultc C s@ | j st| jd |jf | j x| jD ]}|j| q*W dS )a Ensure feature and its requirements are included in distribution
You may override this in a subclass to perform additional operations on
the distribution. Note that this method may be called more than once
per feature, and so should be idempotent.
z3 is required, but is not available on this platformN)r r r r r ry r )r5 rD r r r r r s zFeature.include_inc C s2 |j f | j | jr.x| jD ]}|j| q W dS )a2 Ensure feature is excluded from distribution
You may override this in a subclass to perform additional operations on
the distribution. This method will be called at most once per
feature, and only after all included features have been asked to
include themselves.
N)r r r r )r5 rD r r r r r s zFeature.exclude_fromc C s2 x,| j D ]"}|j|std| j||f qW dS )a Verify that feature makes sense in context of distribution
This method is called by the distribution just before it parses its
command line. It checks to ensure that the 'remove' attribute, if any,
contains only valid package/module names that are present in the base
distribution when 'setup()' is called. You may override it in a
subclass to perform any other required validation of the feature
against a target distribution.
zg%s wants to be able to remove %s, but the distribution doesn't contain any packages or modules under %sN)r rJ r r )r5 rD r r r r r s
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