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pdfcraft/docs
Max Abramowitz 3a117c3c0e M10: open Word, Excel and PowerPoint files through LibreOffice
## What this changes

**File ▸ Open opens Word, Excel, PowerPoint, OpenDocument and RTF files** as new, unsaved PDFs (`Report.docx` → `Report.pdf`), the "LibreOffice sidecar" that `docs/gaps.md` (gap 8) and `docs/file-format-parity.md` planned for `create.from-office`.

- **Conversion** (`crates/create/src/office.rs`): an installed LibreOffice runs headless as a separate process, in a private temporary folder (the input is always `document.<ext>`, so the user's file name never reaches its command line). It gets a fresh profile with `DisableMacrosExecution`, `MacroSecurityLevel` 3 and `BlockUntrustedRefererLinks` set, and Writer's and Calc's `Content/Update/Link` set to *Never* (2 for Writer and 1 for Calc: the two number their values differently), no console window on Windows (`CREATE_NO_WINDOW`), and is killed after 120 s. The output is size-capped (512 MB), must start `%PDF-`, and must open as a PDF before it is used. LibreOffice is found through `PDFCRAFT_SOFFICE`, the `PATH`, then the usual install folders per OS. Without it, the user is told it's needed rather than "not a readable PDF".
- **Off the frame thread:** File ▸ Open converts on the existing open worker (`ResultKind::Converted`); the frame thread only opens the result.
- **Detection:** `SourceKind::Office` requires an Office extension *and* an OLE, ZIP or RTF signature, so `photos.zip`, or a PDF saved with a `.docx` name, are not misread.
- **Open dialog:** PDF (still the default), Images, Office documents, Text, All files. All files is left out on macOS, where rfd merges every filter into one allowed-types list, and on the web; Office documents are left out on the web. The extension lists are now shared constants in `pdfcraft-create` (`IMAGE_EXTENSIONS`, `TEXT_EXTENSIONS`, `OFFICE_EXTENSIONS`), used by both detection and the picker. The duplicate filter list in `open_dialog` is gone. The two new labels are in all 22 catalogues, with their `ATTRIBUTION.toml` hashes updated.
- **Automation:** `doc_create_multiple`, `doc_combine` and batch `convert` go through `convert_to_pdf`, so they take Office documents too; their descriptions say so.

**Deliberately not in this PR:** Insert pages, Combine files and Create ▸ Multiple files convert on the frame thread, so they now refuse Office documents with a pointer to File ▸ Open (`convert_to_pdf_inline` / `as_pdf_inline`) rather than freezing the window for seconds. Moving them onto a worker is the follow-up. `create.from-office` goes planned → **partial**, with that and the rest listed in its notes.

## How you verified it

On Windows 11 Pro with LibreOffice 26.8.1 installed, per crate:

- [x] `cargo fmt --check`
- [x] `cargo clippy -p pdfcraft-create -p pdfcraft-engine -p pdfcraft-ui-egui -p pdfcraft-automation -j 2 --all-targets -- -D warnings`
- [x] `cargo test -p pdfcraft-create -p pdfcraft-engine --lib` (42 and 276 pass); `-p pdfcraft-automation --test automation` (the combine/create tests); `-p pdfcraft-ui-egui --lib open_worker` and `--test editing --test create`
- [x] `cargo xtask layers`, `cargo xtask assets`, `cargo xtask parity --partial`
- [ ] wasm check: the `wasm32-unknown-unknown` target isn't installed here, so I'm leaving it to CI. The web paths are `cfg`'d and were reviewed by eye.

**Tests seen failing before the fix**, by reverting each part:
- Detection off → `office_documents_are_their_own_kind`, `source_kind_tells_pdfs_images_and_text_apart`, and both engine Office tests fail.
- Worker conversion off → `file_open_converts_an_office_document_on_the_worker` fails with the old user-facing message, *"the file is not a readable PDF: no readable page tree or cross-reference data was found"*.

New tests also cover a converter that hangs (it's stopped; the test binary stands in for LibreOffice), one that writes no PDF, a missing converter, temp-folder cleanup, `file://` URL escaping (spaces, drive letters, UTF-8), and the search order.

**Real conversions, end to end:** `crates/automation/tests/it/office.rs` builds a minimal DOCX, an XLSX (with a formula, `=6*7`), a PPTX and an RTF inside the test, so no binary fixtures are committed. It runs them through `doc_create_multiple` in `separate` mode (each output reopened and its text checked, including `42`) and in `combine` mode (page order and bookmarks), and through `doc_combine` beside a PDF, with a page range on one file. These tests, `libreoffice_converts_a_document_when_installed` and the process-tree cleanup test (5 out of 5 reruns) pass with LibreOffice 26.8.1. The Office tests skip where LibreOffice isn't installed, which includes CI.

Three existing tests used a 4-byte `report.docx` as their "file that can't be converted" example. That's no longer true, so they now use `archive.zip`, which keeps what they test.

## Never-crash

- [x] No new `unwrap`/`expect`/`panic!`/`unreachable!`/`todo!` outside tests
- [x] No input-derived indexing or slicing (`rsplit_once` for the extension); the PDF read back is size-capped
- [x] No `unsafe`. The Windows flag uses `std::os::windows::process::CommandExt`
- [x] A crashing, hanging or misbehaving LibreOffice is an error, never a panic or a stuck app: the worker's `catch_unwind`, a 120 s kill, and output checks

## Provenance

- [x] No Adobe assets; no fonts; no copied code
- [x] LibreOffice (MPL-2.0) is only *run* as an external process, as the docs planned; nothing of it is linked or copied. Its command-line options and the profile keys come from LibreOffice's public documentation.
- [x] The translations are contributor-original, written from the plain meaning of "Office documents" and "All files" ("Office" kept as a product name); hashes updated, `cargo xtask assets` passes

## Security

- [x] `--root` confinement unchanged: automation still resolves and reads paths before converting; only the private temp folder is written outside it
- [x] MCP and the control channel untouched
- [ ] **No new outbound network: please decide.** PdfCraft itself opens no connection. The profile blocks untrusted referer links and sets Writer and Calc never to update linked content on load. I converted eight synthetic files that link to a listener on 127.0.0.1: RTF `INCLUDETEXT` and `INCLUDEPICTURE`, a DOCX external picture, an ODT linked section and linked picture, an ODS table source and an external cell reference, and an ODP linked picture. None made a connection, with or without the link settings. Two things remain open: Impress has no link-update setting, and the process's network access isn't sandboxed (documented in `crates/create/README.md` and `docs/gaps.md`).

## Parity and reach

- [x] `create.from-office` planned → partial, with the evidence tests and what's still missing
- [x] Reachable headlessly (`doc_create_multiple`, `doc_combine`, batch `convert`)
- [x] Docs: `docs/file-format-parity.md` (Word/Excel/PowerPoint and RTF rows), `docs/gaps.md` gap 8, `docs/target-app-parity.md` row J (numbers not re-measured), `docs/roadmap.md` M10, the `ROADMAP.md` log, and the `crates/create` README

## Anything a reviewer should look at first

1. **The network question** above. It's the owner's call.
2. **The frame-thread restraint:** Insert, Combine and Create Multiple refuse Office documents rather than block. Is a worker for those wanted in this PR, or as a follow-up?
2026-11-11 11:06:01 +01:00
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