Changelog

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Pre-1.0: a minor version may rename or remove. When it does, the migration is one line here.

0.1.2 (2026-09-18)

Fixes from an external review of 0.1.1. Correctness, and a more honest account of what the concurrency story does and does not cover.

  • .xlsx reads that lost data. An ISO-date cell (t="d", from a workbook saved with iso_dates) read as nil and, since it read as nothing, was erased on the next write; it now reads as a Date or NaiveDateTime. An elapsed duration ([h]:mm:ss) read as a Time, throwing away whole days (36 hours became 12); it keeps its number and its format now. A float smaller than 1.0e-15 (such as 1.0e-20) was written as 0; the shortest round-tripping form is written instead. An error cell (#DIV/0!) with no formula crashed any write to its sheet; the error now reads into the cell's metadata, the same place a formula's error goes, so the write succeeds. (Writing such a cell back verbatim is still to come; an untouched error cell rewrites empty for now.)
  • .xlsx writes that corrupted the file. A shared-string table spelled with a namespace prefix (<x:sst>) silently dropped a newly added string, so the cell read back nil; mutations are namespace-aware now. Removing calcChain.xml left its relationship and content-type override behind, pointing at a part that was gone; both go with it.
  • A local write no longer loosens a file's permissions. Replacing a 0600 file produced a 0644 one, because the temporary file took the process umask. The destination's mode is now preserved, a new file is created 0600, and the temporary file is created exclusively.
  • Sheetshow.Table.compact/1 no longer deletes a live row when a tombstone shares its id after a refresh: an ambiguous tombstone is left for a fresh read to resolve.
  • Reserved and colliding columns are refused. Sheetshow.Table.new/2 and Sheetshow.Log.new/2 reject a schema with an id or deleted column, or two columns that differ only by case or spacing; a tab whose header names a needed column twice reads as %Sheetshow.Error{reason: :duplicate_column} rather than silently taking the last.
  • Sheetshow.Schema.cast/2 turns a serial number too large to convert into a :cast error, rather than raising.
  • WebDAV: a PUT that returns no ETag leaves the version :unknown instead of adopting one from a follow-up HEAD, which could be a racing writer's.
  • Google: a batch that adds a tab and then deletes it in one plan no longer leaves the tab in the remembered metadata; adds and deletes are applied in order.
  • What Sheetshow can promise, corrected. A conditional-write store makes each run/2 on a file atomic against a racing writer, but does not yet tie a Table write to the snapshot it was planned against, because run/2 re-reads the file at execution. The guide, the Sheetshow.Table docs and the README said this gap was closed; they now say it is not, and the README's retry note carries the same caveat the guide always has.

0.1.1 (2026-09-17)

Fixes from a QA pass over 0.1.0, all in the .xlsx codec unless said otherwise:

  • A column of formulas Excel filled down (one <f t="shared"> and pointers under it) read as empty formulas and was written back as <f></f>, taking the formulas out of the file. Each cell now reads as the shared formula moved to it.
  • Conditional formatting's fonts and fills (under <dxfs>) were counted with the lists a cell indexes into, so a new style pointed past the end of <fonts>.
  • Deleting a sheet whose name a writer had escaped its own way (Q1&apos;s, as LibreOffice does) left the <sheet> element behind, pointing at a part that was gone.
  • Adding a string rewrote the shared string table from the text alone, flattening rich text in every other cell of the workbook. The table is spliced now.
  • A worksheet whose elements carry a namespace prefix (<x:sheetData>) is read but refused a write, rather than written back with two sheetData elements.
  • Sheetshow.Table.refresh/2: an id the snapshot had read twice, one of whose rows had since gone, came back as two rows on one sheet row with the flag cleared. Both stay flagged until a fresh read.
  • Sheetshow.records/3 raised on header: false.
  • A colour such as "#FF8800\n" passed Sheetshow.Style.validate/1 and failed in the Google encoder; a sheet name or reference with a trailing newline parsed.
  • Sheetshow.Schema.cast/2: a :json column accepts a number or boolean a person typed, and a :boolean column accepts 1.0 and 0.0.
  • Every function that takes options now refuses an option it does not know, as Sheetshow.plan/2 already did: the layout builders, Sheetshow.Client.new/2, Sheetshow.Workbook.xlsx/2, Sheetshow.Token, Sheetshow.Log.Event.new/2, Sheetshow.Table.insert/2 and delete/2, Sheetshow.OAuth, Sheetshow.ServiceAccount.assertion/2, Sheetshow.UserAccount.new/3 and Sheetshow.Store.webdav/2.

0.1.0 (2026-09-16)

The first release. What is in it:

  • Cells and layout. Sheetshow.Cell, Sheetshow.Coord, Sheetshow.Range and Sheetshow.A1, giving 0-indexed coordinates, inclusive ranges, quoted sheet names and open-ended ranges, with Sheetshow.Value (numbers, text, booleans, formulas, dates and times as serial numbers) and Sheetshow.Style (a plain map). Layout on Sheetshow: row, col, rows, records, to_rows, stack, beside, pad_below, pad_right, shift, put_sheet, put_style, max_row and max_col.
  • Plans. Sheetshow.plan/2 turns cells into backend-neutral ops (AddSheet, DeleteSheet, PutCells, AppendRows, DeleteRows, SetDimensions), one PutCells per run so a write never clears a neighbour, and Sheetshow.run/2 carries a plan out in one request. Sheetshow.read_cells/2 reads cells with everything about them; read_rows/2 reads computed values, one or several ranges in one request.
  • Backends. Sheetshow.Workbook over Google Sheets (Sheetshow.Google, OTP's :httpc, TLS verified explicitly, the quota as :rate_limited), over an in-memory spreadsheet that doubles as the test double, and over .xlsx files, read one tab at a time and written back with every untouched part copied across compressed, on a local file or a WebDAV server, where If-Match makes a write conditional. Sheetshow.Backend.capabilities/1 says what each promises.
  • A database on a tab. Sheetshow.Schema as a keyword list; Sheetshow.Log, an append-only tab whose state is the fold over its rows, with a cursor read and a view tab; Sheetshow.Table, mutable rows found again by id, with soft delete, refresh/2 and a planner that orders hard deletes bottom-up; Sheetshow.ULID for client-generated ids.
  • Credentials. Sheetshow.ServiceAccount and Sheetshow.UserAccount, both reduced to one Sheetshow.Token; Sheetshow.OAuth builds the consent URL and reads the answer, with PKCE, access_type=offline and prompt=consent as the defaults.
  • Guides that run. Two quick starts, against Google and against an .xlsx file; setting up Google; a cookbook; the case for Sheets instead of Postgres; and what Sheetshow can promise. Every elixir block in them is executed by the test suite. A cheatsheet generated from the compiled modules, and usage-rules.md for an agent's context.
  • No dependencies, no processes, no macros.