pseudo_builder.py

"""
This builder functions as a pseudo builder that instead downloads and installs a binary file using
release-gitter based on a pyproject.toml file. It's a total hack...
"""

from __future__ import annotations

from dataclasses import dataclass
from pathlib import Path
from shutil import copy
from shutil import copytree

import toml
from wheel.wheelfile import WheelFile

import release_gitter as rg
from release_gitter import removeprefix


@dataclass
class Config:
    name: str
    format: str
    git_url: str
    hostname: str
    owner: str
    repo: str
    version: str | None = None
    pre_release: bool = False
    version_git_tag: bool = False
    version_git_no_fetch: bool = False
    map_system: dict[str, str] | None = None
    map_arch: dict[str, str] | None = None
    exec: str | None = None
    extract_all: bool = False
    extract_files: list[str] | None = None
    include_extra_files: list[str] | None = None


def download(config: Config, wheel_scripts: Path) -> list[Path]:
    """Download and extract files to the wheel_scripts directory"""
    return rg.download_release(
        rg.GitRemoteInfo(config.hostname, config.owner, config.repo),
        wheel_scripts,
        config.format,
        version=config.version,
        system_mapping=config.map_system,
        arch_mapping=config.map_arch,
        extract_files=config.extract_files,
        pre_release=config.pre_release,
        exec=config.exec,
    )


def read_metadata() -> Config:
    """Read configuration from pyproject.toml"""
    pyproject = toml.load("pyproject.toml").get("tool", {}).get("release-gitter")
    if not pyproject:
        raise ValueError("Must have configuration in [tool.release-gitter]")

    git_url = pyproject.pop("git-url", None)
    remote_info = rg.parse_git_url(git_url)

    config = Config(
        name=pyproject.pop("name", remote_info.repo),
        format=pyproject.pop("format"),
        git_url=git_url,
        hostname=pyproject.pop("hostname", remote_info.hostname),
        owner=pyproject.pop("owner", remote_info.owner),
        repo=pyproject.pop("repo", remote_info.repo),
    )

    for key, value in pyproject.items():
        setattr(config, str(key).replace("-", "_"), value)

    if config.version is None:
        config.version = rg.read_version(
            config.version_git_tag,
            not config.version_git_no_fetch,
        )

    if config.extract_all:
        config.extract_files = []

    return config


class _PseudoBuildBackend:
    # Should allow passing args as `--build-option`
    _gitter_args = None

    def prepare_metadata_for_build_wheel(
        self, metadata_directory, config_settings=None
    ):
        # Create a .dist-info directory containing wheel metadata inside metadata_directory. Eg {metadata_directory}/{package}-{version}.dist-info/
        print("Prepare meta", metadata_directory, config_settings)

        metadata = read_metadata()
        version = removeprefix(metadata.version, "v") if metadata.version else "0.0.0"

        # Returns distinfo dir?
        dist_info = Path(metadata_directory) / f"{metadata.name}-{version}.dist-info"
        dist_info.mkdir()

        # Write metadata
        pkg_info = dist_info / "METADATA"
        pkg_info.write_text(
            "\n".join(
                [
                    "Metadata-Version: 2.1",
                    f"Name: {metadata.name}",
                    f"Version: {version}",
                ]
            )
        )

        # Write wheel info
        wheel_info = dist_info / "WHEEL"
        wheel_info.write_text(
            "\n".join(
                [
                    "Wheel-Version: 1.0",
                    "Root-Is-Purelib: true",
                    "Tag: py2-none-any",
                    "Tag: py3-none-any",
                ]
            )
        )

        return str(dist_info)

    def build_sdist(self, sdist_directory, config_settings=None):
        # Builds a .tar.gz and places it in specified sdist_directory
        # That should contain a toplevel drectory of `name-version` containing source files and the pyproject.toml

        # HACK: This isn't needed or used
        p = Path(sdist_directory + ".dist-info")
        return p

    def build_wheel(
        self, wheel_directory, config_settings=None, metadata_directory=None
    ):
        if metadata_directory is None:
            raise ValueError("Cannot build wheel without metadata_directory")
        metadata_directory = Path(metadata_directory)

        metadata = read_metadata()
        version = removeprefix(metadata.version, "v") if metadata.version else "0.0.0"

        wheel_directory = Path(wheel_directory)
        wheel_directory.mkdir(exist_ok=True)

        wheel_scripts = wheel_directory / f"{metadata.name}-{version}.data/scripts"
        wheel_scripts.mkdir(parents=True, exist_ok=True)

        copytree(metadata_directory, wheel_directory / metadata_directory.name)

        metadata = read_metadata()
        download(metadata, wheel_scripts)

        for file_name in metadata.include_extra_files or []:
            file = Path(file_name)
            if Path.cwd() in file.absolute().parents:
                copy(file_name, wheel_scripts / file)
            else:
                raise ValueError(
                    f"Cannot include any path that is not within the current directory: {file_name}"
                )

        print(f"ls {wheel_directory}: {list(wheel_directory.rglob('*'))}")

        wheel_filename = f"{metadata.name}-{version}-py2.py3-none-any.whl"
        with WheelFile(wheel_directory / wheel_filename, "w") as wf:
            print("Repacking wheel as {}...".format(wheel_filename), end="")
            # sys.stdout.flush()
            wf.write_files(str(wheel_directory))

        return wheel_filename


_BACKEND = _PseudoBuildBackend()


prepare_metadata_for_build_wheel = _BACKEND.prepare_metadata_for_build_wheel
build_sdist = _BACKEND.build_sdist
build_wheel = _BACKEND.build_wheel