pip3 shim to uv pip

pip3

#!/usr/bin/env python3
# /// script
# requires-python = ">=3.9"
# dependencies = []
# ///

import sys
import configparser
import os
from pathlib import Path


# Note: this isn't exhaustive, but mostly tries to follow
# https://pip.pypa.io/en/stable/topics/configuration/ although we ignore XDG and only support the
# '[global]' section rather than per-command options for now
config = configparser.ConfigParser()
globalconf = Path("/etc/pip/pip.conf").expanduser()
userconf = Path("~/.pip/pip.conf").expanduser()
if "VIRTUAL_ENV" in os.environ:
    venvconf = Path(os.environ["VIRTUAL_ENV"]) / "pip.conf"
else:
    venvconf = ""
if "PIP_CONFIG_FILE" in os.environ:
    pipconf = Path(os.environ["PIP_CONFIG_FILE"])
else:
    pipconf = ""

env = {k: v for k, v in os.environ.items()}

# initialise uv env from pip.conf files
if pipconf != os.devnull and config.read(
    filenames=[globalconf, userconf, venvconf, pipconf]
):
    env["UV_INDEX_URL"] = config.get("global", "index-url", fallback="")
    env["UV_EXTRA_INDEX_URL"] = " ".join(
        config.get("global", "extra-index-url", fallback="").split("\n")
    )

# override uv env from uv or pip envvars if those are set
env["UV_INDEX_URL"] = (
    os.getenv("UV_INDEX_URL") or os.getenv("PIP_INDEX_URL") or env["UV_INDEX_URL"]
)
env["UV_EXTRA_INDEX_URL"] = (
    os.getenv("UV_EXTRA_INDEX_URL")
    or os.getenv("PIP_EXTRA_INDEX_URL")
    or env["UV_EXTRA_INDEX_URL"]
)

args = ["uv", "pip"] + sys.argv[1:]

os.execvpe("uv", args, env)