dschlueter
6db834addd
Fortsetzungszeilen werden wieder mit genau einem Leerzeichen zur ursprünglichen Codezeile zusammengefügt. Im Python-Beispielbuch sind das 195 Stellen; danach lassen sich 247 statt 203 von 255 Python-Blöcken parsen. Abschaltbar mit --keep-wrap-markers; der Bericht enthält wrap_lines_joined pro Block und einen Hinweis pro Kapitel. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
481 lines
22 KiB
Python
481 lines
22 KiB
Python
"""Orchestration of the complete EPUB -> Markdown conversion."""
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from __future__ import annotations
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import os
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import posixpath
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import re
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import shutil
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import sys
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import tempfile
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from dataclasses import asdict, dataclass, field
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from datetime import datetime, timezone
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from pathlib import Path
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from typing import Any
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from . import TOOL_NAME, __version__
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from .chapters import ChapterBuilder
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from .diagnostics import Diagnostics
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from .epub_reader import EpubReader, parse_xml
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from .errors import ContainerError, InputError, StructureError
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from .footnotes import collect_notes
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from .html_converter import RenderOptions, Renderer
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from .linkcheck import check_links
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from .media import MediaRegistry
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from .models import Chapter
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from .normalize import Doc, book_uses_title_tables, is_html_toc_doc, make_doc, normalize_doc, remove_keep_tail
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from .references import LinkResolver
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from .utils import is_inside, iter_elements, sha256_file, slugify
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from . import writer
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MARKER_FILES = ("conversion-report.json", "manifest.json")
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LARGE_CHAPTER_WORDS = 30000 # above this a deeper --chapter-level is suggested (RAG/readability)
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@dataclass
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class Options:
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format: str = "gfm"
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extract_media: bool = True
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copy_original: bool = False
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chapter_level: int = 1
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toc: bool = True
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frontmatter: bool = True
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footnotes: str = "end-of-chapter"
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math: str = "auto"
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images: str = "relative"
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slug_language: str = "de"
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keep_html: bool = False
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code_language: str = ""
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keep_wrap_markers: bool = False
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strict: bool = False
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verbose: bool = False
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dry_run: bool = False
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force: bool = False
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report: str | None = None
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command: list[str] = field(default_factory=list)
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def public(self) -> dict[str, Any]:
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data = asdict(self)
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data.pop("command")
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return data
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@dataclass
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class Result:
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report: dict[str, Any]
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chapters: list[Chapter]
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files: dict[str, str]
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output_dir: Path
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def check_paths(input_path: Path, output_dir: Path, opts: Options) -> None:
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if not input_path.is_file():
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raise InputError(f"Eingabedatei nicht gefunden oder keine Datei: {input_path}")
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if not os.access(input_path, os.R_OK):
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raise InputError(f"Eingabedatei nicht lesbar: {input_path}")
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if not 1 <= opts.chapter_level <= 6:
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raise InputError("--chapter-level muss zwischen 1 und 6 liegen.")
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if opts.dry_run:
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return
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if output_dir.exists() and not output_dir.is_dir():
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raise InputError(f"Ausgabepfad existiert und ist kein Verzeichnis: {output_dir}")
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if output_dir.exists() and any(output_dir.iterdir()):
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if not opts.force:
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raise InputError(
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f"Ausgabeverzeichnis existiert bereits und ist nicht leer: {output_dir}\n"
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"Mit --force wird es ersetzt (nur wenn es eine frühere epub2md-Ausgabe ist)."
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)
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resolved = output_dir.resolve()
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protected = {Path("/").resolve(), Path.home().resolve(), Path.cwd().resolve()}
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if resolved in protected or is_inside(Path.cwd(), resolved):
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raise InputError(f"--force verweigert: {output_dir} ist ein geschütztes Verzeichnis.")
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if is_inside(input_path, output_dir):
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raise InputError("--force verweigert: die Eingabedatei liegt im Ausgabeverzeichnis.")
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if not any((output_dir / m).is_file() for m in MARKER_FILES):
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raise InputError(
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f"--force verweigert: {output_dir} enthält keine frühere epub2md-Ausgabe "
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"(conversion-report.json/manifest.json fehlen). Bitte manuell prüfen."
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)
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def convert(input_path: Path, output_dir: Path, opts: Options) -> Result:
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diag = Diagnostics(verbose=opts.verbose, strict=opts.strict)
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check_paths(input_path, output_dir, opts)
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generated_at = datetime.now(timezone.utc).replace(microsecond=0).isoformat()
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sha = sha256_file(input_path)
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diag.step(f"Öffne {input_path}")
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reader = EpubReader(input_path, diag)
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try:
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return _convert(reader, input_path, output_dir, opts, diag, generated_at, sha)
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finally:
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reader.close()
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def _load_docs(reader: EpubReader, package: Any, diag: Diagnostics) -> list[Doc]:
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docs: list[Doc] = []
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for item in package.spine:
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try:
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root = parse_xml(reader.read(item.path), item.path, diag, html_fallback=True)
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except StructureError as exc:
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diag.error("xhtml-unreadable", str(exc), item.path, critical=True)
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continue
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except KeyError:
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diag.error("spine-file-missing", f"Spine-Dokument fehlt: {item.path}", item.path, critical=True)
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continue
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docs.append(make_doc(item.path, root, item.linear))
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if not docs:
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raise StructureError("Keines der Spine-Dokumente konnte gelesen werden.")
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return docs
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def _convert(reader: EpubReader, input_path: Path, output_dir: Path, opts: Options, diag: Diagnostics,
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generated_at: str, sha: str) -> Result:
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package = reader.load_package()
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md = package.metadata
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diag.step(f"EPUB {package.version}: {md.title!r}, {len(package.spine)} Spine-Dokumente")
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docs = _load_docs(reader, package, diag)
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# --- normalization and HTML-TOC handling
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title_tables = book_uses_title_tables(docs)
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for doc in docs:
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normalize_doc(doc, diag, title_tables)
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landmark_toc_docs = {lm.path for lm in package.landmarks if lm.type == "toc" and lm.path and not lm.fragment}
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for lm in package.landmarks:
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if lm.type == "toc" and lm.fragment:
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toc_doc = next((d for d in docs if d.path == lm.path), None)
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el = next((e for e in iter_elements(toc_doc.body) if e.get("id") == lm.fragment), None) if toc_doc else None
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if toc_doc is not None and el is not None and el is not toc_doc.body and _mostly_links(el):
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toc_doc.toc_ids.update(e.get("id") for e in iter_elements(el) if e.get("id"))
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remove_keep_tail(el)
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if package.toc:
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for doc in docs:
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if is_html_toc_doc(doc, package.nav_path, landmark_toc_docs):
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doc.skipped = "html-toc"
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diag.info("html-toc-skipped", "HTML-Inhaltsverzeichnis übersprungen (ersetzt durch README.md/NAV).", doc.path)
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if all(d.skipped for d in docs):
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for d in docs:
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d.skipped = ""
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# --- notes, chapters, links
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notes = collect_notes(docs, opts.footnotes, diag)
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diag.step(f"{len(notes.notes)} Anmerkungen erkannt")
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chapters = ChapterBuilder(opts.chapter_level, package.toc, diag).build(docs)
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_assign_filenames(chapters, opts.slug_language)
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readme_path = "README.md" if opts.toc else None
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resolver = LinkResolver(docs, chapters, notes, readme_path)
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nav_targets: list[tuple[str, str]] = []
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def walk(entries: list[Any]) -> None:
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for e in entries:
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if e.path and e.fragment:
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nav_targets.append((e.path, e.fragment))
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walk(e.children)
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walk(package.toc)
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resolver.add_targets(nav_targets)
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diag.step(f"{len(chapters)} Kapitel gebildet")
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# --- rendering
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media = MediaRegistry(package, opts.images, opts.slug_language)
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cover_out = ""
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if md.cover_path and opts.extract_media and reader.exists(md.cover_path):
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cover_out = media.register(md.cover_path, role="cover", hint="cover").output
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language = (md.language or "de").lower()
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renderer = Renderer(
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RenderOptions(format=opts.format, footnotes=opts.footnotes, math=opts.math,
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extract_media=opts.extract_media, keep_html=opts.keep_html, language=language,
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code_language=opts.code_language, keep_wrap_markers=opts.keep_wrap_markers),
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resolver, media, notes, diag, set(reader.names),
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)
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width = max(3, len(str(len(chapters) + 1)))
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notes_title = "Anmerkungen" if language.startswith("de") else "Notes"
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endnotes_number = 999 if len(chapters) < 999 else len(chapters) + 1
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renderer.endnotes_file = f"chapters/{endnotes_number:0{width}d}-{slugify(notes_title, opts.slug_language)}.md"
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for ch in chapters:
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diag.step(f"Rendere {ch.filename}")
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ch.markdown = renderer.render_chapter(ch)
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ch.stats.word_count = _word_count(ch.markdown)
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_check_chapter_size(ch, opts.chapter_level, diag)
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wraps: dict[str, int] = {}
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for block in renderer.code_blocks:
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if block["wrap_lines_joined"]:
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wraps[block["chapter"]] = wraps.get(block["chapter"], 0) + block["wrap_lines_joined"]
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for chapter_file, joined in wraps.items():
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diag.info("wrap-markers-joined", f"{joined} Druck-Zeilenumbrüche (↪) in Codeblöcken zusammengeführt.",
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chapter_file, chapter_file)
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endnotes: Chapter | None = None
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endnotes_md = ""
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if opts.footnotes == "end-of-book" and renderer.book_notes:
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endnotes_md = renderer.render_endnotes_file(notes_title)
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endnotes = Chapter(number=len(chapters) + 1, title=notes_title, items=[], docs=[], types=["endnotes"])
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endnotes.filename = renderer.endnotes_file
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endnotes.stats.footnotes = len(renderer.book_notes)
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endnotes.stats.word_count = _word_count(endnotes_md)
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# --- remaining media (fonts, css, audio, unreferenced images)
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skipped_formula_images = 0
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if opts.extract_media:
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for item in package.manifest.values():
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if item.path in media.files or not reader.exists(item.path):
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continue
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if item.media_type in ("application/xhtml+xml", "text/html", "application/x-dtbncx+xml",
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"application/oebps-package+xml") or item.path == package.opf_path:
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continue
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if item.path in renderer.consumed_formula_images:
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skipped_formula_images += 1
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continue
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mf = media.register(item.path, role="unreferenced")
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mf.references = 0
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for mf in media.files.values():
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if mf.data is None and reader.exists(mf.source):
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mf.size = reader.names[mf.source].file_size
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# --- assemble output files in memory
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unresolved_notes = [n for n in notes.notes.values() if n.ref_count and not n.label and notes.extracted]
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for n in unresolved_notes:
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diag.warn("note-not-rendered", "Anmerkung wurde referenziert, aber nicht ausgegeben.", n.key)
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opf_dir = posixpath.dirname(package.opf_path)
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files: dict[str, str] = {}
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for ch in chapters:
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warn_count = sum(1 for d in diag.items if d.chapter == ch.filename and d.level != "info")
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ch.warnings = warn_count
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front = writer.chapter_frontmatter(ch, md, input_path.name, opf_dir, warn_count) if opts.frontmatter else ""
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files[ch.filename] = front + ch.markdown
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if endnotes is not None:
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front = writer.chapter_frontmatter(endnotes, md, input_path.name, opf_dir, 0) if opts.frontmatter else ""
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files[endnotes.filename] = front + endnotes_md
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all_chapters = chapters + ([endnotes] if endnotes else [])
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stats = _book_stats(all_chapters, media, renderer, diag)
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if opts.toc:
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files["README.md"] = writer.readme(md, chapters, endnotes, package.toc, resolver, stats, cover_out,
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package.version, input_path.name, opts.command)
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existing = {mf.output for mf in media.files.values()} if opts.extract_media else set()
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if opts.copy_original:
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existing.add(f"source/{input_path.name}")
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existing.update({"metadata.yaml", "manifest.json", "conversion-report.json",
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"diagnostics/warnings.md", "diagnostics/unsupported-elements.md"})
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broken = check_links(files, existing)
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for b in broken:
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diag.warn("broken-output-link", f"Link {b['link']} in der Ausgabe ist ungültig ({b['reason']}).", b["file"], b["file"])
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stats["warnings"] = diag.count("warning")
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report = _report(input_path, sha, generated_at, package, opts, all_chapters, media, renderer, notes, diag,
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docs, broken, skipped_formula_images)
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files["metadata.yaml"] = writer.metadata_yaml(md, input_path.name, sha, package.version, cover_out,
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opts.public(), generated_at)
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files["manifest.json"] = writer.to_json(_manifest(md, all_chapters, media, diag))
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files["conversion-report.json"] = writer.to_json(report)
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files["diagnostics/warnings.md"] = writer.warnings_md(diag)
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files["diagnostics/unsupported-elements.md"] = writer.unsupported_md(diag)
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if opts.dry_run:
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return Result(report=report, chapters=all_chapters, files=files, output_dir=output_dir)
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_write_output(reader, input_path, output_dir, opts, files, media)
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if opts.report:
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report_path = Path(opts.report)
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report_path.parent.mkdir(parents=True, exist_ok=True)
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report_path.write_text(writer.to_json(report), encoding="utf-8")
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return Result(report=report, chapters=all_chapters, files=files, output_dir=output_dir)
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def _mostly_links(el: Any) -> bool:
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from .utils import local, norm_ws, text_content
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total = len(norm_ws(text_content(el)))
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links = sum(len(norm_ws(text_content(a))) for a in iter_elements(el) if local(a.tag) == "a")
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return total > 0 and links / total >= 0.5
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def _assign_filenames(chapters: list[Chapter], slug_language: str) -> None:
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width = max(3, len(str(len(chapters) + 1)))
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used: set[str] = set()
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for ch in chapters:
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base = slugify(ch.title, slug_language, fallback=(ch.types[0] if ch.types else "kapitel"))
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name = f"{ch.number:0{width}d}-{base}"
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candidate, n = name, 2
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while candidate in used:
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candidate = f"{name}-{n}"
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n += 1
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used.add(candidate)
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ch.filename = f"chapters/{candidate}.md"
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def _check_chapter_size(ch: Chapter, chapter_level: int, diag: Diagnostics) -> None:
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"""Suggest a deeper --chapter-level for very large chapters with enough sub-headings."""
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if ch.stats.word_count <= LARGE_CHAPTER_WORDS or chapter_level >= 6:
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return
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sections = len(re.findall(r"^## ", ch.markdown, re.M))
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if sections >= 2:
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diag.warn(
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"chapter-large",
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f"Kapitel „{ch.title}“ hat {ch.stats.word_count} Wörter und {sections} Unterabschnitte; "
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f"--chapter-level {chapter_level + 1} würde sie als eigene Dateien ausgeben.",
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ch.docs[0] if ch.docs else "",
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ch.filename,
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)
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def _word_count(markdown: str) -> int:
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text = re.sub(r"^(`{3,}).*?^\1\s*$", " ", markdown, flags=re.M | re.S)
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text = re.sub(r"<[^>]+>|\]\([^)]*\)", " ", text)
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return len(re.findall(r"\w+", text))
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def _book_stats(chapters: list[Chapter], media: MediaRegistry, renderer: Renderer, diag: Diagnostics) -> dict[str, int]:
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def total(attr: str) -> int:
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return sum(getattr(c.stats, attr) for c in chapters)
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return {
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"chapters": len(chapters),
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"images": total("images"),
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"svgs": total("svgs"),
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"media_files": len(media.files),
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"code_blocks": total("code_blocks"),
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"code_blocks_unlabeled": total("code_blocks_unlabeled"),
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"formulas": len(renderer.formulas),
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"formulas_as_image": total("math_as_image"),
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"formulas_as_mathml": total("math_as_mathml"),
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"footnotes": len(renderer.book_notes),
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"tables": total("tables"),
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"tables_html": total("tables_html"),
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"warnings": diag.count("warning"),
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}
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def _manifest(md: Any, chapters: list[Chapter], media: MediaRegistry, diag: Diagnostics) -> dict[str, Any]:
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return {
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"book": {"title": md.title, "subtitle": md.subtitle, "authors": md.authors, "language": md.language,
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"identifier": md.identifier, "isbn": md.isbn, "publisher": md.publisher},
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"chapters": [
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{
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"number": c.number,
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"title": c.title,
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"file": c.filename,
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"source_href": c.docs[0] if c.docs else None,
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"source_hrefs": c.docs,
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"types": c.types,
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"anchors": c.anchors,
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"word_count": c.stats.word_count,
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"code_blocks": c.stats.code_blocks,
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"images": c.stats.images + c.stats.svgs,
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"math_blocks": c.stats.math_block,
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"math_inline": c.stats.math_inline,
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"footnotes": c.stats.footnotes,
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"tables": c.stats.tables,
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"warnings": c.warnings,
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}
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for c in chapters
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],
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"media": [m.as_dict() for m in media.files.values()],
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"warnings": [d.as_dict() for d in diag.items if d.level != "info"],
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}
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def _report(input_path: Path, sha: str, generated_at: str, package: Any, opts: Options, chapters: list[Chapter],
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media: MediaRegistry, renderer: Renderer, notes: Any, diag: Diagnostics, docs: list[Doc],
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broken: list[dict[str, str]], skipped_formula_images: int) -> dict[str, Any]:
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from collections import Counter
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reps = Counter(f["representation"] for f in renderer.formulas)
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origins = Counter(f["origin"] for f in renderer.formulas)
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langs = Counter(c["language"] or "(keine)" for c in renderer.code_blocks)
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special = [{"type": t, "title": c.title, "file": c.filename} for c in chapters for t in c.types
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if t in ("glossary", "bibliography", "index", "index-persons", "endnotes", "appendix")]
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errors = [d.as_dict() for d in diag.items if d.level == "error"]
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warnings = [d.as_dict() for d in diag.items if d.level == "warning"]
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status = "success" if not errors and not warnings else ("success-with-errors" if errors else "success-with-warnings")
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return {
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"tool": TOOL_NAME,
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"version": __version__,
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"generated_at": generated_at,
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"status": status,
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"lossless": False if (warnings or errors) else None,
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"input": {"file": str(input_path), "name": input_path.name, "sha256": sha,
|
|
"size": input_path.stat().st_size},
|
|
"epub": {"version": package.version, "opf": package.opf_path, "nav": package.nav_path,
|
|
"ncx": package.ncx_path, "spine_items": len(package.spine),
|
|
"manifest_items": len(package.manifest)},
|
|
"options": opts.public(),
|
|
"metadata": asdict(package.metadata),
|
|
"chapters": [
|
|
{"number": c.number, "title": c.title, "file": c.filename, "source_hrefs": c.docs, "types": c.types,
|
|
"stats": c.stats.as_dict(), "warnings": c.warnings}
|
|
for c in chapters
|
|
],
|
|
"skipped_documents": [{"href": d.path, "reason": d.skipped} for d in docs if d.skipped],
|
|
"media": {"count": len(media.files), "files": [m.as_dict() for m in media.files.values()],
|
|
"formula_images_replaced_by_tex": skipped_formula_images},
|
|
"code_blocks": {"count": len(renderer.code_blocks), "languages": dict(langs),
|
|
"items": renderer.code_blocks},
|
|
"formulas": {"count": len(renderer.formulas), "representations": dict(reps), "origins": dict(origins),
|
|
"items": renderer.formulas},
|
|
"footnotes": {"mode": opts.footnotes, "detected": len(notes.notes),
|
|
"referenced": sum(1 for n in notes.notes.values() if n.ref_count),
|
|
"rendered": len(renderer.book_notes)},
|
|
"special_sections": special,
|
|
"warnings": warnings,
|
|
"errors": errors,
|
|
"infos": [d.as_dict() for d in diag.items if d.level == "info"],
|
|
"unresolved_links": diag.unresolved_links,
|
|
"unsupported_elements": dict(diag.unsupported),
|
|
"output_link_check": {"broken": broken, "broken_count": len(broken)},
|
|
}
|
|
|
|
|
|
def _write_output(reader: EpubReader, input_path: Path, output_dir: Path, opts: Options,
|
|
files: dict[str, str], media: MediaRegistry) -> None:
|
|
parent = output_dir.resolve().parent
|
|
try:
|
|
parent.mkdir(parents=True, exist_ok=True)
|
|
tmp = Path(tempfile.mkdtemp(prefix=".epub2md-", dir=parent))
|
|
except OSError as exc:
|
|
raise InputError(f"Ausgabeverzeichnis nicht beschreibbar: {parent} ({exc.strerror or exc})") from exc
|
|
try:
|
|
for rel, content in files.items():
|
|
_write_file(tmp, rel, content.encode("utf-8"))
|
|
if opts.extract_media:
|
|
for mf in media.files.values():
|
|
data = mf.data if mf.data is not None else reader.read(mf.source)
|
|
_write_file(tmp, mf.output, data)
|
|
if opts.copy_original:
|
|
dest = tmp / "source" / input_path.name
|
|
dest.parent.mkdir(parents=True, exist_ok=True)
|
|
shutil.copy2(input_path, dest)
|
|
if output_dir.exists():
|
|
if any(output_dir.iterdir()):
|
|
shutil.rmtree(output_dir) # safety checks were done in check_paths()
|
|
else:
|
|
output_dir.rmdir()
|
|
os.replace(tmp, output_dir)
|
|
except OSError as exc:
|
|
shutil.rmtree(tmp, ignore_errors=True)
|
|
raise InputError(f"Schreibfehler im Ziel {output_dir}: {exc.strerror or exc}") from exc
|
|
except BaseException:
|
|
shutil.rmtree(tmp, ignore_errors=True)
|
|
raise
|
|
|
|
|
|
def _write_file(root: Path, rel: str, data: bytes) -> None:
|
|
target = (root / rel).resolve()
|
|
if not is_inside(target, root):
|
|
raise ContainerError(f"Ausgabepfad außerhalb des Zielverzeichnisses verweigert: {rel}")
|
|
target.parent.mkdir(parents=True, exist_ok=True)
|
|
target.write_bytes(data)
|
|
|
|
|
|
def print_summary(result: Result, opts: Options) -> None:
|
|
r = result.report
|
|
n_warn = len(r["warnings"])
|
|
n_err = len(r["errors"])
|
|
action = "Analyse (--dry-run, nichts geschrieben)" if opts.dry_run else f"Ausgabe: {result.output_dir}"
|
|
print(f"{TOOL_NAME}: {len(r['chapters'])} Kapitel, {r['media']['count']} Mediendateien, "
|
|
f"{r['code_blocks']['count']} Codeblöcke, {r['formulas']['count']} Formeln, "
|
|
f"{r['footnotes']['rendered']} Anmerkungen, {n_warn} Warnungen, {n_err} Fehler")
|
|
print(action)
|
|
if opts.dry_run:
|
|
for c in r["chapters"]:
|
|
print(f" {c['file']} ← {', '.join(c['source_hrefs'][:2])}{' …' if len(c['source_hrefs']) > 2 else ''}")
|
|
if opts.report:
|
|
print("Hinweis: --report wird bei --dry-run nicht geschrieben.", file=sys.stderr)
|