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23ef39a2d9
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Add dynamic completion scaffolding to the clan `cli`. Also add a dynamic completion mechanism for machines for commands that have machines as their sole argument. More intricate dynamic completions will be implemented in follow up PR's.
82 lines
2.2 KiB
Python
82 lines
2.2 KiB
Python
import argparse
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import json
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import subprocess
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import threading
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from collections.abc import Callable, Iterable
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from types import ModuleType
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from typing import Any
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"""
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This module provides dynamic completions.
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The completions should feel fast.
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We target a maximum of 1second on our average machine.
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"""
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argcomplete: ModuleType | None = None
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try:
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import argcomplete # type: ignore[no-redef]
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except ImportError:
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pass
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def clan_dir(flake: str | None) -> str | None:
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from .dirs import get_clan_flake_toplevel_or_env
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path_result = get_clan_flake_toplevel_or_env()
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return str(path_result) if path_result is not None else None
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def complete_machines(
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prefix: str, parsed_args: argparse.Namespace, **kwargs: Any
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) -> Iterable[str]:
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"""
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Provides completion functionality for machine names configured in the clan.
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"""
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machines: list[str] = []
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def run_cmd() -> None:
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try:
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# In my tests this was consistently faster than:
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# nix eval .#nixosConfigurations --apply builtins.attrNames
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cmd = ["nix", "flake", "show", "--system", "no-eval", "--json"]
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if (clan_dir_result := clan_dir(None)) is not None:
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cmd.append(clan_dir_result)
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result = subprocess.run(
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cmd,
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check=True,
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capture_output=True,
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text=True,
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)
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data = json.loads(result.stdout)
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try:
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machines.extend(data.get("nixosConfigurations").keys())
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except KeyError:
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pass
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except subprocess.CalledProcessError:
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pass
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thread = threading.Thread(target=run_cmd)
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thread.start()
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thread.join(timeout=3)
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if thread.is_alive():
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return iter([])
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machines_dict = {name: "machine" for name in machines}
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return machines_dict
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def add_dynamic_completer(
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action: argparse.Action,
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completer: Callable[..., Iterable[str]],
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) -> None:
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"""
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Add a completion function to an argparse action, this will only be added,
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if the argcomplete module is loaded.
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"""
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if argcomplete:
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# mypy doesn't check this correctly, so we ignore it
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action.completer = completer # type: ignore[attr-defined]
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