The audiobook importer accepted .txt/.md/.epub but not PDF — the single most
common "ebook in" format. Add a pure `pdf_to_chapter_script(data)` that
extracts the text layer page-by-page and runs it through the existing
chapterizer, so PDFs land in the same `# Heading` + body grammar EPUB and
plaintext already produce (one front door onto the unchanged render pipeline).
- Dep: `pypdf>=4.0` — pure-Python, MIT, zero native deps, so PDF import behaves
identically on macOS/Windows/Linux (default-feature cross-platform rule).
EPUB + plaintext stay stdlib-only; only PDF needs a real parser.
- Robustness, surfaced as actionable 400s rather than silent empty imports:
corrupt file, password-protected (empty-password decrypt attempted first),
scanned/image-only (no text layer → clear "scanned PDF" message), and a
page-count ceiling. A single unparseable page is skipped, not fatal.
- Route: `.pdf` branch in audiobook_import; frontend accept filter +
api-client doc updated to `.txt,.md,.epub,.pdf`.
tests/test_longform_import.py: 5 PDF cases (extract+chapterize, no-marker
single chapter, corrupt, image-only, page-cap) using a hand-built in-memory
PDF — no PDF-authoring test dep, mirroring the in-memory-EPUB approach.
16 passed; frontend suite 401; CJK guard green.
Palash Debnath
ca8a2e8eb8