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#!/usr/bin/env python
Copy library files from CPython.
    # Single file
    python scripts/update_lib copy-lib cpython/Lib/dataclasses.py
    # Directory
    python scripts/update_lib copy-lib cpython/Lib/json
import argparse
import pathlib
import shutil
def _copy_single(
    src_path: pathlib.Path,
    lib_path: pathlib.Path,
    verbose: bool = True,
    """Copy a single file or directory."""
    # Remove existing file/directory
    if lib_path.exists():
        if lib_path.is_dir():
            if verbose:
                print(f"Removing directory: {lib_path}")
            shutil.rmtree(lib_path)
        else:
            if verbose:
                print(f"Removing file: {lib_path}")
            lib_path.unlink()
    if src_path.is_dir():
        if verbose:
            print(f"Copying directory: {src_path} -> {lib_path}")
        lib_path.parent.mkdir(parents=True, exist_ok=True)
        shutil.copytree(src_path, lib_path)
        if verbose:
            print(f"Copying file: {src_path} -> {lib_path}")
        lib_path.parent.mkdir(parents=True, exist_ok=True)
        shutil.copy2(src_path, lib_path)
def copy_lib(
    src_path: pathlib.Path,
    verbose: bool = True,
    Copy library file or directory from CPython.
    Also copies additional files if defined in DEPENDENCIES table.
        src_path: Source path (e.g., cpython/Lib/dataclasses.py or cpython/Lib/json)
        verbose: Print progress messages
    from update_lib.deps import get_lib_paths
    from update_lib.file_utils import parse_lib_path
    # Extract module name and cpython prefix from path
    path_str = str(src_path).replace("\\", "/")
    if "/Lib/" not in path_str:
        raise ValueError(f"Path must contain '/Lib/' (got: {src_path})")
    cpython_prefix, after_lib = path_str.split("/Lib/", 1)
    # Get module name (first component, without .py)
    name = after_lib.split("/")[0]
    if name.endswith(".py"):
        name = name[:-3]
    # Get all paths to copy from DEPENDENCIES table
    all_src_paths = get_lib_paths(name, cpython_prefix)
    # Copy each file
    for src in all_src_paths:
        if src.exists():
            lib_path = parse_lib_path(src)
            _copy_single(src, lib_path, verbose)
def main(argv: list[str] | None = None) -> int:
    parser = argparse.ArgumentParser(
        description=__doc__,
        formatter_class=argparse.RawDescriptionHelpFormatter,
    parser.add_argument(
        "path",
        type=pathlib.Path,
        help="Source path containing /Lib/ (e.g., cpython/Lib/dataclasses.py)",
    args = parser.parse_args(argv)
        copy_lib(args.path)
        return 0
    except ValueError as e:
        print(f"Error: {e}", file=sys.stderr)
        return 1
    except FileNotFoundError as e:
        print(f"Error: {e}", file=sys.stderr)
        return 1
if __name__ == "__main__":
    sys.exit(main())

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