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Add format plugins with export/import and marked PNG - #38
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Refactor md/json/tex outputs behind IFormatPlugin so each format can export from Excel and import back to xlsx. Add an img plugin that embeds EXCELTK1 payloads in a private PNG tkXl chunk and rejects unmarked images for precise round-trips. Co-authored-by: Fan Feilong <fanfeilong@gmail.com>
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September 24, 2026 01:41
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Summary
IFormatPlugin+FormatRegistryso conversion outputs (md/json/tex/img) are plugins with export and import (back to.xlsx).TableDocumentwith markerEXCELTK1(embedded in md/tex comments, JSON, or PNG).-t img): renders a PNG preview and stores the payload in private chunktkXl; unmarked PNGs are rejected on import.XlsxWorkbookWriter) for import; CLI gains-import/-out.docs/format-plugins.md; README updated;test.shcovers round-trip + unmarked rejection.Usage
Demo
Marked PNG export preview
To show artifacts inline, enable in settings.