engine: an emulated acmart sigconf/sigplan sets two columns, as the format does - #220
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…ormat does acmart's conference and journal formats — sigconf, sigplan, acmtog, siggraph, sigchi, acmengage — are two-column by nature: the paper never passes [twocolumn], the format sets it, exactly as IEEEtran does (#218). The emulation (used when a paper does not bundle acmart.cls) applied only the single-column geometry floor, so these papers were set one column wide and over-paginated. Set two columns for the two-column acmart formats, the way #218 did for IEEEtran. The format is read bare ([sigconf]) or as format=… ([format=sigconf]). Measured over the 157 arXiv papers with a tectonic reference: Σ page error 574 → 568, papers within two pages 96 → 98, bias +36 → +30. Two papers change, both improve, none regress; glyph-path counts are stable (no content lost, the content repaginates into two columns). This reaches the emulation path; papers that bundle acmart.cls still render single-column (a separate, larger problem). Full suite, conformance ratchet, go vet and gofmt green. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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#220 set two columns for acmart's sigconf/sigplan/… formats, but only on the emulation path (when the paper does not ship acmart.cls). A paper that DOES bundle the real acmart.cls loads it — single-column in this engine — and missed the column layout, still over-paginating ~2×. Move the two-column decision ahead of the class-resolvable check, so it applies whether the paper bundles the class or not; the emulation geometry floor still applies only on the unbundled path. The format detection is unchanged (acmartTwoColumnFormat, reading [sigconf] or [format=sigconf]). Measured over the 157 arXiv papers with a tectonic reference, on top of #220: Σ page error 568 → 536, papers within two pages 98 → 102, exact 23 → 24, bias +30 → -18. Six papers change, all six improve, none regress; content (glyph-path) counts are stable, so no content is lost — the papers repaginate into two columns. The real acmart.cls loads without conflict; the e.twoColumn flag drives the page builder regardless. Full suite, conformance ratchet, go vet and gofmt green. Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>
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acmart's conference and journal formats —sigconf,sigplan,acmtog,siggraph,sigchi,acmengage— are two-column by nature: the paper never passes[twocolumn], the format sets it, exactly as IEEEtran does (#218). The emulation (used when a paper does not bundleacmart.cls) applied only the single-column geometry floor, so these papers were set one column wide and over-paginated.This sets two columns for the two-column acmart formats, the way #218 did for IEEEtran. The format is read bare (
[sigconf]) or asformat=…([format=sigconf]).Measured (157 arXiv papers with a tectonic reference)
Two papers change, both improve, none regress; glyph-path counts are stable (no content lost — it repaginates into two columns). This addresses the emulation path; papers that bundle
acmart.clsstill render single-column (a separate, larger problem — the engine would need to honour the real class's two-column machinery).This is the largest identified lever on the over-pagination measured in #146 (comment):
acmarttwo-column formats carried +22 of the +36 bias.Full suite, conformance ratchet,
go vetandgofmtgreen.🤖 Generated with Claude Code