151 lines
4.6 KiB
Python
151 lines
4.6 KiB
Python
#!/usr/bin/env python3
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from __future__ import annotations
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import argparse
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import json
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import os
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import tempfile
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from pathlib import Path
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from typing import Any, Callable, NoReturn, Optional
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class SkillArgumentParser(argparse.ArgumentParser):
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def error(self, message: str) -> NoReturn:
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raise ValueError(f"参数错误：{message}")
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def emit(payload: dict[str, Any]) -> None:
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print(json.dumps(payload, ensure_ascii=False))
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def failure_message(exc: Exception) -> str:
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if isinstance(exc, FileExistsError):
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return str(exc)
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if isinstance(exc, PermissionError):
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return "文件处理失败：没有目标路径的访问权限"
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if isinstance(exc, OSError):
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return f"文件处理失败：{exc}"
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return str(exc)
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def run_cli(action: Callable[[], dict[str, Any]]) -> int:
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try:
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result = action()
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except Exception as exc:
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emit({"ok": False, "error": failure_message(exc)})
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return 1
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emit({"ok": True, **result})
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return 0
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def input_pdf(value: str) -> Path:
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path = Path(value).expanduser().resolve()
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if not path.exists():
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raise FileNotFoundError(f"PDF 文件不存在：{path}")
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if not path.is_file():
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raise ValueError(f"PDF 路径不是文件：{path}")
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if path.suffix.lower() != ".pdf":
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raise ValueError("PDF 输入路径必须以 .pdf 结尾")
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if path.stat().st_size <= 0:
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raise ValueError("PDF 文件为空")
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return path
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def output_pdf(value: str, overwrite: bool) -> Path:
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path = Path(value).expanduser().resolve()
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if path.suffix.lower() != ".pdf":
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raise ValueError("PDF 输出路径必须以 .pdf 结尾")
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if path.exists() and not overwrite:
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raise FileExistsError(f"目标文件已存在：{path}")
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path.parent.mkdir(parents=True, exist_ok=True)
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return path
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def output_directory(value: str) -> Path:
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path = Path(value).expanduser().resolve()
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if path.exists() and not path.is_dir():
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raise ValueError(f"输出路径不是目录：{path}")
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path.mkdir(parents=True, exist_ok=True)
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return path
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def new_temp_pdf(output: Path) -> Path:
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descriptor, name = tempfile.mkstemp(
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prefix=f".{output.name}.",
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suffix=".part.pdf",
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dir=str(output.parent),
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)
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os.close(descriptor)
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return Path(name)
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def publish_temp_file(temp_path: Path, output: Path, overwrite: bool) -> None:
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if overwrite:
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os.replace(temp_path, output)
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return
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try:
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os.link(temp_path, output)
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except FileExistsError as exc:
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raise FileExistsError(f"目标文件已存在：{output}") from exc
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temp_path.unlink()
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def parse_page_spec(value: Optional[str], page_count: int) -> list[int]:
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if page_count < 1:
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return []
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if value is None or not value.strip():
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return list(range(1, page_count + 1))
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pages: set[int] = set()
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for raw_part in value.split(","):
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part = raw_part.strip()
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if not part:
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continue
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if "-" in part:
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pieces = part.split("-", 1)
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try:
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start = int(pieces[0])
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end = int(pieces[1])
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except ValueError as exc:
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raise ValueError(f"页码范围格式错误：{part}") from exc
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if start > end:
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raise ValueError(f"页码范围起始值不能大于结束值：{part}")
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else:
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try:
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start = end = int(part)
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except ValueError as exc:
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raise ValueError(f"页码格式错误：{part}") from exc
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if start < 1 or end > page_count:
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raise ValueError(f"页码必须在 1 到 {page_count} 之间：{part}")
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pages.update(range(start, end + 1))
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if not pages:
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raise ValueError("页码范围不能为空")
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return sorted(pages)
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def selected_page_window(
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page_count: int,
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start_page: int,
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end_page: Optional[int],
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max_pages: int,
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) -> tuple[int, int, Optional[int]]:
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if page_count < 1:
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raise ValueError("PDF 没有可处理的页面")
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if start_page < 1 or start_page > page_count:
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raise ValueError(f"start-page 必须在 1 到 {page_count} 之间")
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if max_pages < 1:
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raise ValueError("max-pages 必须大于 0")
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requested_end = page_count if end_page is None else end_page
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if requested_end < start_page or requested_end > page_count:
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raise ValueError(
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f"end-page 必须在 start-page 到 {page_count} 之间"
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)
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actual_end = min(requested_end, start_page + max_pages - 1)
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next_page = actual_end + 1 if actual_end < requested_end else None
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return start_page, actual_end, next_page
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