1 files changed, 94 insertions, 0 deletions
diff --git a/third_party/python/setuptools/setuptools/_entry_points.py b/third_party/python/setuptools/setuptools/_entry_points.py
new file mode 100644
index 0000000000..a2346342d6
--- /dev/null
+++ b/third_party/python/setuptools/setuptools/_entry_points.py
@@ -0,0 +1,94 @@
+import functools
+import operator
+import itertools
+
+from .errors import OptionError
+from .extern.jaraco.text import yield_lines
+from .extern.jaraco.functools import pass_none
+from ._importlib import metadata
+from ._itertools import ensure_unique
+from .extern.more_itertools import consume
+
+
+def ensure_valid(ep):
+    """
+    Exercise one of the dynamic properties to trigger
+    the pattern match.
+    """
+    try:
+        ep.extras
+    except AttributeError as ex:
+        msg = (
+            f"Problems to parse {ep}.\nPlease ensure entry-point follows the spec: "
+            "https://packaging.python.org/en/latest/specifications/entry-points/"
+        )
+        raise OptionError(msg) from ex
+
+
+def load_group(value, group):
+    """
+    Given a value of an entry point or series of entry points,
+    return each as an EntryPoint.
+    """
+    # normalize to a single sequence of lines
+    lines = yield_lines(value)
+    text = f'[{group}]\n' + '\n'.join(lines)
+    return metadata.EntryPoints._from_text(text)
+
+
+def by_group_and_name(ep):
+    return ep.group, ep.name
+
+
+def validate(eps: metadata.EntryPoints):
+    """
+    Ensure entry points are unique by group and name and validate each.
+    """
+    consume(map(ensure_valid, ensure_unique(eps, key=by_group_and_name)))
+    return eps
+
+
+@functools.singledispatch
+def load(eps):
+    """
+    Given a Distribution.entry_points, produce EntryPoints.
+    """
+    groups = itertools.chain.from_iterable(
+        load_group(value, group)
+        for group, value in eps.items())
+    return validate(metadata.EntryPoints(groups))
+
+
+@load.register(str)
+def _(eps):
+    r"""
+    >>> ep, = load('[console_scripts]\nfoo=bar')
+    >>> ep.group
+    'console_scripts'
+    >>> ep.name
+    'foo'
+    >>> ep.value
+    'bar'
+    """
+    return validate(metadata.EntryPoints(metadata.EntryPoints._from_text(eps)))
+
+
+load.register(type(None), lambda x: x)
+
+
+@pass_none
+def render(eps: metadata.EntryPoints):
+    by_group = operator.attrgetter('group')
+    groups = itertools.groupby(sorted(eps, key=by_group), by_group)
+
+    return '\n'.join(
+        f'[{group}]\n{render_items(items)}\n'
+        for group, items in groups
+    )
+
+
+def render_items(eps):
+    return '\n'.join(
+        f'{ep.name} = {ep.value}'
+        for ep in sorted(eps)
+    )