126 lines
4.3 KiB
Python
Vendored
126 lines
4.3 KiB
Python
Vendored
# MIT License
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#
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# Copyright The SCons Foundation
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#
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# Permission is hereby granted, free of charge, to any person obtaining
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# a copy of this software and associated documentation files (the
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# "Software"), to deal in the Software without restriction, including
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# without limitation the rights to use, copy, modify, merge, publish,
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# distribute, sublicense, and/or sell copies of the Software, and to
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# permit persons to whom the Software is furnished to do so, subject to
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# the following conditions:
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#
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# The above copyright notice and this permission notice shall be included
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# in all copies or substantial portions of the Software.
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#
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# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY
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# KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
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# WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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"""Variable type for package Variables.
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To be used whenever a 'package' may be enabled/disabled and the
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package path may be specified.
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Given these options ::
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x11=no (disables X11 support)
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x11=yes (will search for the package installation dir)
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x11=/usr/local/X11 (will check this path for existence)
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Can be used as a replacement for autoconf's ``--with-xxx=yyy`` ::
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opts = Variables()
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opts.Add(
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PackageVariable(
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key='x11',
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help='use X11 installed here (yes = search some places)',
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default='yes'
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)
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)
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env = Environment(variables=opts)
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if env['x11'] is True:
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dir = ... # search X11 in some standard places ...
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env['x11'] = dir
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if env['x11']:
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... # build with x11 ...
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"""
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import os
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from typing import Callable, Optional, Tuple, Union
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import SCons.Errors
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__all__ = ['PackageVariable',]
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ENABLE_STRINGS = ('1', 'yes', 'true', 'on', 'enable', 'search')
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DISABLE_STRINGS = ('0', 'no', 'false', 'off', 'disable')
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def _converter(val: Union[str, bool]) -> Union[str, bool]:
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"""Convert package variables.
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Returns True or False if one of the recognized truthy or falsy
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values is seen, else return the value unchanged (expected to
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be a path string).
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"""
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if isinstance(val, bool):
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# mainly for the subst=False case: default might be a bool
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return val
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lval = val.lower()
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if lval in ENABLE_STRINGS:
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return True
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if lval in DISABLE_STRINGS:
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return False
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return val
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def _validator(key: str, val, env, searchfunc) -> None:
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"""Validate package variable for valid path.
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Checks that if a path is given as the value, that pathname actually exists.
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"""
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# NOTE: searchfunc is currently undocumented and unsupported
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if env[key] is True:
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if searchfunc:
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env[key] = searchfunc(key, val)
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# TODO: need to check path, or be sure searchfunc raises.
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elif env[key] and not os.path.exists(val):
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msg = f'Path does not exist for variable {key!r}: {val!r}'
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raise SCons.Errors.UserError(msg) from None
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# lint: W0622: Redefining built-in 'help' (redefined-builtin)
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def PackageVariable(
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key: str, help: str, default, searchfunc: Optional[Callable] = None
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) -> Tuple[str, str, str, Callable, Callable]:
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"""Return a tuple describing a package list SCons Variable.
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The input parameters describe a 'package list' variable. Returns
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a tuple with the correct converter and validator appended.
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The result is usable as input to :meth:`~SCons.Variables.Variables.Add`.
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A 'package list' variable may either be a truthy string from
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:const:`ENABLE_STRINGS`, a falsy string from
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:const:`DISABLE_STRINGS`, or a pathname string.
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This information is appended to *help* using only one string
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each for truthy/falsy.
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"""
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# NB: searchfunc is currently undocumented and unsupported
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help = '\n '.join((help, f'( yes | no | /path/to/{key} )'))
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return (
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key,
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help,
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default,
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lambda k, v, e: _validator(k, v, e, searchfunc),
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_converter,
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)
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# Local Variables:
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# tab-width:4
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# indent-tabs-mode:nil
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# End:
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# vim: set expandtab tabstop=4 shiftwidth=4:
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