The Office three, and the one shortfall they share

[tannevaled]

excel-to-pdf and powerpoint-to-pdf join word-to-pdf, all three through
go-ooxml/ooxml v0.2.0 over go-ooxml/opc v0.1.0.

covered       79
not covered   35
parity       69.3% (79/114), every claim verified

⛔ One shortfall, shared by all three

Each of BentoPDF's three Office tools takes the pre-2007 binary format as
well, and nothing in the fleet reads one:

tool	missing	present
word-to-pdf	DOC	DOCX, ODT, RTF
excel-to-pdf	XLS	XLSX, ODS, CSV
powerpoint-to-pdf	PPT	PPTX, ODP

They are OLE compound files — a different container entirely from OPC, with
its own FAT and its own record streams — so this is a gap of one missing
library, not of three missing readers. The three shortfalls close together or
not at all, which is worth knowing before anybody starts.

Written down in the table the way cbz-to-pdf names CBR: a claim whose
shortfall is written down can be closed by whoever reads it.

What the three readers found worth writing down

Each format turned out to need a rule that would be a silent defect if guessed:

• ⛔ Word: a heading is a paragraph wearing a style, and a hyperlink
  arrives as an external relationship whose Target is the URL — a reader
  calling opc.Resolve there loses every link;
• ⛔ PowerPoint: the slide order is p:sldIdLst, not the filenames, and
  DrawingML carries its formatting as attributes where Word uses child
  elements — so a shared implementation finds no formatting at all;
• ⛔ Excel: with t="s" the <v> is an index into the shared strings,
  and a cell is placed by its reference — appending in order shifts every
  column after a gap.

The claims name ParseWorkbook and ParsePresentation rather than the
repository, so each goes on being checked against the reader it is about.

Measured 2026-10-11 against BentoPDF 3a5f146 (v2.8.8, 114 tools), pdfops
and ops at a376bb2 (= v0.13.0), ooxml v0.2.0, opc v0.1.0, odf
3d1deee (= v0.7.0), convert 45fbb5d, render 3bb5dcf, app
1feda5d, rtf 6bc4897, markdown eafebfd, data 128b6c7.

🤖 Generated with Claude Code