aiti-sheet-univer

❝ Old formats don't block the road — conversion, derivation and editing each in their place. ❞

The Excel implementation extension of the multi-editor mechanism (aiti-editor M0), named per the aiti-<filetype>-<impl> convention.

Capabilities

• .xlsx / .xlsm: Univer preview + editing (styles / formulas / merges / freeze / row height & column width / multiple sheets / hidden sheets / tab color), Ctrl+S save (409 conflict asks to confirm overwrite), stripped items explicitly listed before saving (charts / pivot tables / conditional formatting / rich text etc.)
• .xls / .ods: read-only spreadsheet preview + one-click "convert to .xlsx and open" (-fromxls / -fromods name derivation, (1)/(2) increments on name clashes, never overwrites the original)
• "About this editor": the ⋯ menu shows capabilities / limitations / dependencies / licenses
• Conversion (.xls/.ods → .xlsx) depends on LibreOffice (soffice) — preview is pure-JS zero-install parsing (@e965/xlsx); when soffice is missing, degrade options are offered — install / configure (aiti-editor feature soffice.path) / download to edit locally / open in a virtual environment (aiti-ui-env)

Feature Switch

• sheet.edit: when off, .xlsx/.xlsm are preview-only (editing capability disabled as a whole)

Limitations

• Charts / pivot tables / conditional formatting / data validation unsupported (stripped on save); rich text flattened to plain text; hyperlinks keep their text
• Saving rewrites the whole workbook via exceljs: .xlsm macro preservation is not guaranteed
• Large-sheet truncation: 50,000 rows / 2,000 columns