import argparse import configparser from pathlib import Path from typing import Any, List, Optional, Sequence, Union from ..output_dir import OnConflict, Redownload from ..version import NAME, VERSION # TODO Replace with argparse version when updating to 3.9? class BooleanOptionalAction(argparse.Action): def __init__( self, option_strings: List[str], dest: Any, default: Any = None, type: Any = None, choices: Any = None, required: Any = False, help: Any = None, metavar: Any = None, ): if len(option_strings) != 1: raise ValueError("There must be exactly one option string") [self.name] = option_strings if not self.name.startswith("--"): raise ValueError(f"{self.name!r} doesn't start with '--'") if self.name.startswith("--no-"): raise ValueError(f"{self.name!r} starts with '--no-'") options = [self.name, "--no-" + self.name[2:]] super().__init__( options, dest, nargs=0, default=default, type=type, choices=choices, required=required, help=help, metavar=metavar, ) def __call__( self, parser: argparse.ArgumentParser, namespace: argparse.Namespace, values: Union[str, Sequence[Any], None], option_string: Optional[str] = None, ) -> None: if option_string and option_string in self.option_strings: value = not option_string.startswith("--no-") setattr(namespace, self.dest, value) def format_usage(self) -> str: return "--[no-]" + self.name[2:] CRAWLER_PARSER = argparse.ArgumentParser(add_help=False) CRAWLER_PARSER_GROUP = CRAWLER_PARSER.add_argument_group( title="general crawler arguments", description="arguments common to all crawlers", ) CRAWLER_PARSER_GROUP.add_argument( "--redownload", type=Redownload.from_string, metavar="OPTION", help="when to redownload a file that's already present locally" ) CRAWLER_PARSER_GROUP.add_argument( "--on-conflict", type=OnConflict.from_string, metavar="OPTION", help="what to do when local and remote files or directories differ" ) CRAWLER_PARSER_GROUP.add_argument( "--transform", "-t", action="append", type=str, metavar="RULE", help="add a single transformation rule. Can be specified multiple times" ) CRAWLER_PARSER_GROUP.add_argument( "--max-concurrent-tasks", type=int, metavar="N", help="maximum number of concurrent tasks (crawling, downloading)" ) CRAWLER_PARSER_GROUP.add_argument( "--max-concurrent-downloads", type=int, metavar="N", help="maximum number of tasks that may download data at the same time" ) CRAWLER_PARSER_GROUP.add_argument( "--delay-between-tasks", type=float, metavar="SECONDS", help="time the crawler should wait between subsequent tasks" ) def load_crawler( args: argparse.Namespace, section: configparser.SectionProxy, ) -> None: if args.redownload is not None: section["redownload"] = args.redownload.value if args.on_conflict is not None: section["on_conflict"] = args.on_conflict.value if args.transform is not None: section["transform"] = "\n" + "\n".join(args.transform) if args.max_concurrent_tasks is not None: section["max_concurrent_tasks"] = str(args.max_concurrent_tasks) if args.max_concurrent_downloads is not None: section["max_concurrent_downloads"] = str(args.max_concurrent_downloads) if args.delay_between_tasks is not None: section["delay_between_tasks"] = str(args.delay_between_tasks) PARSER = argparse.ArgumentParser() PARSER.set_defaults(command=None) PARSER.add_argument( "--version", action="version", version=f"{NAME} {VERSION}", ) PARSER.add_argument( "--config", "-c", type=Path, metavar="PATH", help="custom config file" ) PARSER.add_argument( "--dump-config", nargs="?", const=True, metavar="PATH", help="dump current configuration to a file and exit." " Uses default config file path if no path is specified" ) PARSER.add_argument( "--crawler", "-C", action="append", type=str, metavar="NAME", help="only execute a single crawler." " Can be specified multiple times to execute multiple crawlers" ) PARSER.add_argument( "--working-dir", type=Path, metavar="PATH", help="custom working directory" ) PARSER.add_argument( "--explain", action=BooleanOptionalAction, help="log and explain in detail what PFERD is doing" ) def load_default_section( args: argparse.Namespace, parser: configparser.ConfigParser, ) -> None: section = parser[parser.default_section] if args.working_dir is not None: section["working_dir"] = str(args.working_dir) if args.explain is not None: section["explain"] = "true" if args.explain else "false" SUBPARSERS = PARSER.add_subparsers(title="crawlers")