forked from mrlan/EnglishPal
90 lines
2.3 KiB
Python
90 lines
2.3 KiB
Python
import functools
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import operator
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import itertools
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from .errors import OptionError
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from .extern.jaraco.text import yield_lines
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from .extern.jaraco.functools import pass_none
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from ._importlib import metadata
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from ._itertools import ensure_unique
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from .extern.more_itertools import consume
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def ensure_valid(ep):
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"""
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Exercise one of the dynamic properties to trigger
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the pattern match.
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"""
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try:
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ep.extras
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except (AttributeError, AssertionError) as ex:
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# Why both? See https://github.com/python/importlib_metadata/issues/488
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msg = (
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f"Problems to parse {ep}.\nPlease ensure entry-point follows the spec: "
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"https://packaging.python.org/en/latest/specifications/entry-points/"
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)
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raise OptionError(msg) from ex
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def load_group(value, group):
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"""
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Given a value of an entry point or series of entry points,
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return each as an EntryPoint.
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"""
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# normalize to a single sequence of lines
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lines = yield_lines(value)
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text = f'[{group}]\n' + '\n'.join(lines)
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return metadata.EntryPoints._from_text(text)
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def by_group_and_name(ep):
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return ep.group, ep.name
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def validate(eps: metadata.EntryPoints):
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"""
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Ensure entry points are unique by group and name and validate each.
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"""
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consume(map(ensure_valid, ensure_unique(eps, key=by_group_and_name)))
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return eps
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@functools.singledispatch
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def load(eps):
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"""
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Given a Distribution.entry_points, produce EntryPoints.
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"""
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groups = itertools.chain.from_iterable(
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load_group(value, group) for group, value in eps.items()
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)
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return validate(metadata.EntryPoints(groups))
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@load.register(str)
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def _(eps):
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r"""
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>>> ep, = load('[console_scripts]\nfoo=bar')
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>>> ep.group
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'console_scripts'
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>>> ep.name
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'foo'
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>>> ep.value
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'bar'
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"""
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return validate(metadata.EntryPoints(metadata.EntryPoints._from_text(eps)))
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load.register(type(None), lambda x: x)
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@pass_none
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def render(eps: metadata.EntryPoints):
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by_group = operator.attrgetter('group')
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groups = itertools.groupby(sorted(eps, key=by_group), by_group)
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return '\n'.join(f'[{group}]\n{render_items(items)}\n' for group, items in groups)
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def render_items(eps):
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return '\n'.join(f'{ep.name} = {ep.value}' for ep in sorted(eps))
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