Dylan M. Taylor
7f38f41d8c
* Use chrono for UTC/calendar conversion instead of hand-rolled copies Replaces the hand-rolled civil_from_days / days_from_civil copies and the Excel serial-date, FILETIME and logging/PDF date conversions with chrono as a workspace dependency (default-features = false, std only, so wasm is unaffected). Output formats are unchanged and pinned by the existing (and one new) test. Excel's 1900 leap-year bug and the 1900/1904 systems keep their explicit special cases; a small proleptic-Gregorian fallback covers years outside chrono's NaiveDate range so no input changes behaviour or panics. AGENTS.md now says time goes through chrono. Follow-up to storytold/cadcraft#1785 * Never panic or reshape date output for clocks outside chrono's range chrono's From<SystemTime> unwraps, so a clock past year 262143 panicked inside the logger. logging::timestamp now uses the fallible DateTime::from_timestamp and reads such a clock as the epoch, as the old saturating code did. iso_from_unix_secs fell back to the Unix epoch for timestamps chrono rejects; it now keeps the proleptic Gregorian date civil_from_days gives, restoring the pre-chrono result for supported out-of-range u64 inputs. Years past 9999 are written with {:04} rather than %Y (which prepends a '+') in logging::timestamp, iso_from_unix_secs, docbin::filetime_iso and odt::now_iso, so byte-for-byte output is preserved. filetime_iso gained a docstring; AGENTS.md's chrono bullet now notes the narrow out-of-range fallback. Tests cover each boundary. * Don't build an unrepresentable SystemTime in the far-future test UNIX_EPOCH + Duration::from_secs(u64::MAX / 2) overflows Windows' SystemTime and panicked before timestamp() ran, failing the Windows test job. Build it with checked_add and only assert where it exists. * Route out-of-range dates through chrono's 400-year cycle, not hand-rolled copies The PR kept hand-rolled Hinnant `civil_fallback`/`days_from_civil_fallback` copies for dates outside chrono's ±262143-year range, and AGENTS.md carved a "narrow fallback" exception for them. That left calendar arithmetic outside chrono after all. Replace every copy with the Gregorian 400-year cycle (146_097 days): chrono converts the day/year within one cycle and whole cycles are added back via i128 (so i64::MIN/MAX can't overflow). This keeps chrono as the only calendar logic and reproduces the pre-chrono proleptic Gregorian result for every value: - engine cmd/mod.rs `civil_from_days` (reached by the system clock and by `iso_from_unix_secs` for a u64 seconds count past chrono's range). - engine cmd/controls.rs `days_from_civil` and `days_in_month` (`days_in_month` now uses `rem_euclid(400)` since month lengths repeat every 400 years). - formats sheet.rs `civil` and docx chart.rs `civil` (Excel serials). Outputs are unchanged: verified the cycle result equals the old formula over a wide range and at the extremes with a scratch chrono program. New tests pin accepted inputs past chrono's range on both sides of the epoch, through the public/lib entry points and the private converters, with values from the old formula. Removed the AGENTS.md "narrow fallback" exception. pdf/lib.rs `civil` is left as-is: its only caller is the live system clock and its year is clamped to 0..9999 by the PDF DateTime, so the epoch fallback past year 262143 is the accepted live-clock behavior, not a hand-rolled copy. Tested: cargo test -p wordcraft-engine -p wordcraft-formats -p wordcraft-docx; fmt --check; clippy --all-targets -D warnings. * logging/docbin/odt/pdf: keep extended-year dates, no epoch fallback FredApps (CHANGES_REQUESTED) showed `DateTime::from_timestamp(..).unwrap_or_default()` changes output: a timestamp the old code converted past chrono's year 262143 range now collapsed to 1970-01-01 instead of its real proleptic-Gregorian date. The same regression exists wherever the PR swapped a hand-rolled converter for the epoch fallback. Fix every such site to keep chrono as the only calendar logic via the 400-year Gregorian cycle (146_097 days): chrono converts the day within one cycle, whole cycles carry in the year (i128, saturated into i64). Verified the cycle result equals the old formula across a wide range and at the extremes. - apps/wordcraft/src/logging.rs `timestamp`: added `civil_from_days(u64)` (cycle), kept the pre-1970 epoch clamp (`duration_since`) and the milliseconds/time-of-day format exactly. Pins: UNIX_EPOCH + 10_000_000_000_000 s -> 318857-05-20T17:46:40.000Z (FredApps' example, was 1970-...); the checked_add u64::MAX/2 s fixture now asserts 292277026596-12-04T15:30:07.000Z instead of the epoch. - crates/docbin/src/metadata.rs `filetime_iso`: restored a cycle-based `civil(i64)` instead of `from_timestamp(..)?` (which dropped the field past chrono's range). A u64 FILETIME caps at ~1.83e12 unix s (year 60056), inside chrono's range, so no reachable value changes; pinned the largest FILETIME (u64::MAX) -> 60056-05-28T05:36:10Z to lock the extended-year path. - crates/formats/src/odt.rs `now_iso`: reuse the crate's existing cycle converter `sheet::civil` (made pub(crate)) rather than the epoch fallback. - crates/pdf/src/lib.rs `civil`: cycle converter; year returned unclamped and the caller's existing PDF DateTime 0..=9999 year clamp is kept exactly, so month/day/time of a far-future clock survive. Pins: civil(10_000_000_000_000)=(318857,5,20,17,46,40), civil(-10_000_000_000_000)=(-314918,8,13,6,13,20), civil(253_402_300_800)=(10000,1,1,0,0,0). engine `cmd/mod.rs::iso_from_unix_secs` already uses the cycle fallback (last round); unchanged. * Don't build a year-318857 SystemTime unchecked in the logging test Windows' SystemTime only reaches about year 30828, so UNIX_EPOCH + Duration::from_secs(10_000_000_000_000) panicked before timestamp() ran and failed the Windows test job. Build it with checked_add and assert where the platform can hold it. The year-10000 case fits everywhere and stays unconditional. * Name the 400-year range extension as the one exception to the time rule The rule said never to hand-roll calendar math, but the range fix (shifting by whole 400-year Gregorian cycles so dates past chrono's year range keep their old output) is cycle arithmetic, so the rule and the code disagreed. The rule now names that exception: the library still computes month, day and time, and only whole cycles are carried in the year. * Say the library computes month and day; time-of-day is plain arithmetic Narrows the range-extension wording: the date library computes the calendar fields, and splitting seconds into hours, minutes and seconds is ordinary arithmetic, which is what the code does.
WordCraft
Writing and document design; an open-source, modern word processor, built in pure Rust.
A fast, open-source word processor with a familiar workflow: the ribbon, styles,
tables, track changes, references and mail merge. It reads and writes .docx, runs natively on
macOS, Windows, Linux and BSD, and in the browser via WebAssembly.
By the ArtCraft team.
WordCraft on getartcraft.com · ArtCraft · All Crafting Apps
The Open Studio Handbook, WordCraft's built-in sample: the ribbon, live Styles gallery, rulers and the Navigation pane.
Note
ArtCraft is a community of artists from all walks of life. Painters, photographers, filmmakers, illustrators, designers, animators, hobbyists, and people who picked up a pencil last week. If you make things, you're one of us. Come say hi on Discord.
A tour · Why WordCraft · What works today · Quick start · For agents · Architecture · Roadmap · Downloads · The Crafting Apps · License and credits
A tour
Every screenshot below is WordCraft itself, rendered offscreen by its own UI test harness
(cargo run -p wordcraft-ui-egui --example ui_shot).
 Review. Track changes, comment balloons in the margin, accept and reject, spelling and grammar as you type. |
 References. Tables of contents, footnotes, citations in APA, MLA, Chicago or IEEE, index and captions. |
 Design. Themes, style sets, paragraph spacing, watermarks, page colour and borders. |
 Dark mode with formatting marks, and the Insert tab: tables, pictures, shapes, links, headers, footers, fields and symbols. |
 Layout. Drop caps, text wrapping around pictures and shapes, automatic hyphenation, line numbers and page borders. |
|
 File. Start from a template, open recent documents, edit properties, export to PDF and other formats. |
|
Why WordCraft
- Familiar. Ribbon tabs, groups, shortcuts and behaviour: Enter continues a list, Tab demotes it, Ctrl/⌘+B bolds the word under the caret, the Styles gallery previews styles live, F4 repeats, F7 checks spelling, F8 extends the selection.
- Your files. Opens and saves .docx (OOXML), and also .odt, .rtf, .html, .md, .tex (LaTeX), .txt; opens legacy 97-2003 .doc; exports PDF with real, selectable text, links and bookmarks.
- Fast. Paragraph layout is cached, so typing in a 188-page document re-lays it out in about 1.4 ms; pages render on demand.
- Everywhere. One Rust codebase for macOS, Windows, Linux, BSD and the web. No Electron, no Tauri: native egui on the GPU.
- Built for agents. Every action is a command with an id. The same 422 commands drive the ribbon, keyboard shortcuts, the command search, a command-line tool, a JSON control channel and an MCP server.
- Private. Spelling, grammar and everything else work offline.
- Open. MIT OR Apache-2.0. Clean-room: built from public specifications and observation, with every asset original or openly licensed.
What works today
| Area | Highlights |
|---|---|
| Writing | Fast typing with IME, smart quotes, AutoCorrect, list autoformat (* , 1. ), dashes; word, sentence, paragraph selection; drag-select; clipboard with formatting; undo/redo; find and replace with regex |
| Formatting | Fonts, sizes, bold/italic/underline styles, strike, sub/superscript, caps, highlight, colours, character spacing, Format Painter, Change Case, Clear Formatting |
| Paragraphs | Alignment, indents (draggable on the ruler), spacing, line spacing, tabs with leaders, borders, shading, keep with next, widow/orphan control |
| Styles | Built-in style set, live gallery, Styles pane, create/modify/update styles, style sets, themes |
| Lists | Bullets, numbering, multilevel, restart, set value, custom formats |
| Tables | Insert by grid, merge/split, styles with banded rows, borders, shading, header rows repeated across pages, rows that split across pages, sort, formulas, text ↔ table |
| Pages | Margins, orientation, size, columns, page/column/section breaks, headers and footers (first page, odd/even), page numbers, watermark, page borders, line numbers, vertical alignment, drop caps, automatic hyphenation |
| Objects | Pictures (resize, crop, recolour, brightness/contrast, transparency, background removal, picture styles, rotate), shapes, text boxes, floating position with text wrapping (square, top and bottom, behind or in front of text) |
| References | Table of contents, footnotes and endnotes, citations and bibliography (APA, MLA, Chicago, IEEE), captions, table of figures, cross-references, index, table of authorities |
| Review | Spelling and grammar with suggestions (English and Polish, by each run's language), thesaurus, word count, comments in margin balloons or a pane, track changes, accept/reject, compare documents, restrict editing, accessibility checker, document inspector |
| Mailings | Mail merge from CSV, merge fields, address block, greeting line, rules, preview, finish to a document; envelopes and labels |
| View | Print layout, web layout, draft, read mode, focus, zoom, one/multiple pages, page width, Navigation pane, rulers, gridlines, dark mode; interface in English, 简体中文, 繁體中文, 日本語, Português (Brasil), Español, Українська, Српски / Srpski, Eesti, Türkçe, Русский, Italiano, Deutsch, Polski, Čeština, Magyar, Français, Български, Tiếng Việt, 한국어 or Svenska (follows the system language by default) |
| Files | .docx read/write, legacy 97-2003 .doc import, PDF export, .odt, .rtf, .html, .md, .tex, .txt import/export, page images |
The honest picture, area by area, is in ROADMAP.md, the parity assessment and the generated feature checklist.
Quick start
git clone https://github.com/storytold/wordcraft
cd wordcraft
cargo run --release -p wordcraft -- --sample # the desktop app with the sample document
cargo run --release -p wordcraft -- report.docx # open a document
Command line:
wordcraft-cli convert report.docx report.pdf # docx, pdf, odt, rtf, html, md, tex, txt, png
wordcraft-cli text report.docx # plain text
wordcraft-cli inspect report.docx # structure as JSON
wordcraft-cli run --template sample \
--cmd 'select.text={"text":"Membership"}' --cmd format.bold --save out.docx
wordcraft-cli run --script job.json # the same from a file: commands, then save to docx and pdf
Web: cd apps/wordcraft-web && trunk serve, then open http://127.0.0.1:8771/?sample.
For agents: CLI and MCP
WordCraft was designed to be driven by people and by AI agents.
claude mcp add wordcraft -- wordcraft-cli mcp # headless documents
# confine the agent to folders: wordcraft-cli mcp --automation-read-root DIR --automation-write-root DIR
wordcraft --control 7981 & # or drive the running app…
claude mcp add wordcraft-app -- wordcraft-cli mcp --connect 127.0.0.1:7981
Tools include list_commands, execute, batch, type_text, select_text, inspect_document,
render_page, save_document, and, with a running app, screenshot, click and key. Agents
can check their work through inspect_document without screenshots. See docs/mcp.md
and the control protocol. Macros record any sequence of commands and
play it back (tools.recordMacro, tools.macros).
Logs
The desktop app writes its log records to standard error and to logs/wordcraft.log next to its
preferences: on Linux $XDG_CONFIG_HOME/wordcraft/logs/ (by default ~/.config/wordcraft/logs/),
on macOS ~/Library/Application Support/WordCraft/logs/, on Windows %APPDATA%\WordCraft\logs\.
A start from a desktop menu or the Dock has no terminal, so this file is what to attach to a bug
report: unreadable parts of a .docx, pictures or fonts a PDF export had to leave out and panics the
command guard recovered from land there. Each launch moves the previous log to wordcraft.1.log
(and that one to wordcraft.2.log), so the log of a run that crashed survives the next start; a
log stops growing at 16 MiB. --version writes no file, and runs with WORDCRAFT_NO_PREFS (agents'
test runs) log to standard error only. Document text is never logged; a panic message leaves out
the text it quotes.
By default WordCraft's own crates log at info and everything else at warn. RUST_LOG replaces
that with env_logger-style directives, for example RUST_LOG=debug,
RUST_LOG=warn,wordcraft_docx=trace or RUST_LOG=info,wgpu_core=warn; a directive ending in *
covers every target starting with it (wordcraft*=debug). The logger is
apps/wordcraft/src/logging.rs.
Architecture
| Layer | Crate | Job |
|---|---|---|
| L0 | wordcraft-geom |
units and measurements |
| L1 | wordcraft-doc, wordcraft-fonts, wordcraft-proof |
document model and editing; fonts and shaping; spelling, grammar, hyphenation |
| L2 | wordcraft-layout, wordcraft-docx, wordcraft-formats |
line breaking, pagination, tables, notes, hit testing; OOXML; ODT/RTF/HTML/Markdown/TXT |
| L3 | wordcraft-render, wordcraft-pdf |
rasteriser (vello_cpu); PDF (craft-pdf, Krilla) |
| L4 | wordcraft-engine |
session, undo, 422 commands, document feature catalog |
| L5 | wordcraft-mcp |
MCP server |
| L6 | wordcraft-ui-egui |
the word processor front end (swappable) |
| apps | wordcraft, wordcraft-cli, wordcraft-web |
desktop, command line, browser |
cargo xtask ci runs formatting, clippy, ~800 tests, the asset-attribution check, the layering
check and the wasm build. Contributor and agent instructions: AGENTS.md.
Roadmap
WordCraft is in alpha. It has commands for 97% of the ribbon and menu features in its feature catalog
(docs/parity-checklist.md) today; counting
depth, file fidelity, stability and the rest, we estimate it is about 60% ready for real work,
about 55% for a typical professional's weekly work and about 63% for everyday essentials. Beta
needs testing against real-world .docx files, keeping charts and SmartArt through a round trip,
closer pagination fidelity, a stability sweep and native printing. Details and estimates:
ROADMAP.md and where we fall short.
Downloads
Download WordCraft from GitHub: the latest release has every build listed below, and all releases has earlier versions and their notes. <ver> in the file names is the version number, and SHA256SUMS.txt lists a checksum for every file.
Windows
| Build | Installer | Portable |
|---|---|---|
| x64 (64-bit Intel/AMD) | wordcraft-<ver>-windows-x64.msi |
wordcraft-<ver>-windows-x64-portable.zip |
| arm64 (Snapdragon and other ARM PCs) | wordcraft-<ver>-windows-arm64.msi |
wordcraft-<ver>-windows-arm64-portable.zip |
| x86 (32-bit) | wordcraft-<ver>-windows-x86.msi |
wordcraft-<ver>-windows-x86-portable.zip |
Installers and executables are code-signed.
If the app doesn't open on Windows: the desktop app initializes only DirectX 12 by default.
Letting wgpu also create an OpenGL instance can crash some graphics drivers (AMD's
atio6axx.dll) before the window appears, so the app would flash in Task Manager and quit.
WGPU_BACKEND overrides the default for troubleshooting (for example dx12 or vulkan). In
PowerShell, from the folder containing the executable:
$env:WGPU_BACKEND = "vulkan"
& .\wordcraft.exe
Remove-Item Env:WGPU_BACKEND # restore the default for later launches
An explicit gl override can bring the driver crash back on affected systems. The macOS, Linux
and web backend defaults are unchanged.
The 32-bit build uses OpenGL even when a DirectX 12 graphics card is present. On 32-bit
Windows, creating a DirectX 12 graphics pipeline fails immediately and the app exits before the
window appears. WGPU_BACKEND=vulkan (or dx12) still overrides that.
If the app quits right after its window appears with "Parent device is lost" in the log:
WordCraft compiles DirectX 12 shaders with FXC, the compiler built into Windows, so it needs no
dxcompiler.dll/dxil.dll and ignores any copy another program put on PATH (#603).
WGPU_DX12_COMPILER (fxc, dxc, auto) overrides this; with dxc, a matching
dxcompiler.dll and dxil.dll must sit next to wordcraft.exe. WGPU_BACKEND = "vulkan"
also avoids DirectX 12 altogether.
If the app is slow on an older Windows PC: when DirectX 12 finds no graphics card with a
driver for it (for example Intel 4th-generation graphics on Windows 11), it only offers the built-in
software renderer, which draws every frame on the processor. WordCraft normally uses OpenGL instead,
without setting anything. If OpenGL has no usable adapter, it can use DirectX 12's WARP software
adapter. The log file records the choice (lines starting with
graphics:). WGPU_BACKEND still overrides it, e.g. $env:WGPU_BACKEND = "gl" or "dx12".
macOS
| Build | File | Notes |
|---|---|---|
| App, universal (Apple silicon + Intel) | wordcraft-<ver>-macos-universal.dmg |
Signed and notarized |
| Command-line tool, universal | wordcraft-cli-<ver>-macos-universal.zip |
Signed and notarized |
Linux
| Format | x86_64 | aarch64 (ARM64) | Notes |
|---|---|---|---|
| AppImage | wordcraft-<ver>-linux-x86_64.AppImage |
wordcraft-<ver>-linux-aarch64.AppImage |
Runs anywhere; updates itself with AppImageUpdate (.zsync files) |
| Flatpak | wordcraft-<ver>-linux-x86_64.flatpak |
wordcraft-<ver>-linux-aarch64.flatpak |
Sandboxed; flatpak install --user <file> |
| Debian/Ubuntu | wordcraft-<ver>-linux-x86_64.deb |
wordcraft-<ver>-linux-aarch64.deb |
|
| Fedora/RHEL/openSUSE | wordcraft-<ver>-linux-x86_64.rpm |
wordcraft-<ver>-linux-aarch64.rpm |
|
| Tarball | wordcraft-<ver>-linux-x86_64.tar.gz |
wordcraft-<ver>-linux-aarch64.tar.gz |
Unpack anywhere |
RISC-V (riscv64): wordcraft-<ver>-linux-riscv64.tar.gz, a tarball cross-compiled for glibc 2.39+
(Ubuntu 24.04, Debian 13 and newer).
Wayland: on a Wayland desktop the app runs through XWayland when it is available, because
winit (the windowing library) supports dragging files into the window only on X11. To use the
native Wayland backend instead (for example for sharper text with fractional scaling, at the cost
of file drag-and-drop), start it with WORDCRAFT_WAYLAND=1:
WORDCRAFT_WAYLAND=1 wordcraft
Arch Linux (AUR). Community members maintain three AUR packages; the project doesn't publish to the AUR itself. Install one of them:
| Package | What it installs | Choose it when |
|---|---|---|
wordcraft-bin |
The release tarball above, prebuilt (x86_64, aarch64) | You want the latest release without compiling (quickest) |
wordcraft |
The latest release, built from source with cargo |
You prefer to build releases yourself |
wordcraft-git |
The current main branch, built from source |
You want unreleased changes and accept an occasional broken build |
For example yay -S wordcraft-bin or paru -S wordcraft-bin. |
Community packages
These packages are maintained by community members, not by the WordCraft team.
On Gentoo, the ::snakebyte overlay packages the
Linux release as app-office/wordcraft-bin (prebuilt) and app-office/wordcraft (built from source):
eselect repository add snakebyte git https://github.com/switch87/snakebyte-overlay.git
emaint sync -r snakebyte
echo 'app-office/wordcraft-bin ~amd64' >> /etc/portage/package.accept_keywords/wordcraft
emerge --ask app-office/wordcraft-bin
FreeBSD
| Build | File |
|---|---|
| x86_64 | wordcraft-<ver>-freebsd-x86_64.tar.gz |
Web (WebAssembly)
| Build | File | Notes |
|---|---|---|
| Static site | wordcraft-web-<ver>.zip |
Runs in a modern browser; host it on any static server |
The Crafting Apps
WordCraft is one of the Crafting Apps: free, open-source creative tools from the ArtCraft team, each written from scratch in Rust and each able to stand on its own.
| App | What it's for | Code | Learn more | |
|---|---|---|---|---|
 |
PhotoCraft | Image editing: layers, masks, type and real PSD files | GitHub | Website |
 |
VectorCraft | Vector illustration | GitHub | Website |
 |
FilmCraft | Video editing, color and sound | GitHub | Website |
 |
LightCraft | Photo library and raw development | GitHub | Website |
 |
PdfCraft | Reading, organizing and protecting PDFs | GitHub | Website |
 |
EffectCraft | Motion graphics and visual effects | GitHub | Website |
 |
DesignCraft | Page layout and publishing | GitHub | Website |
 |
WordCraft | Writing and document design · you are here | GitHub | Website |
And ArtCraft itself, our AI image and video studio for artists who want real control.
Come make things with us
Our Discord is where artists of every kind hang out: people who paint, shoot, draw, cut film, set type, and people still figuring out what they like to make. Share what you're working on, ask for help, tell us what's broken, or tell us what you wish these tools could do. Whatever your medium and however long you've been at it, you're welcome here.
discord.gg/artcraft · getartcraft.com · The Crafting Apps · WordCraft
License and credits
WordCraft is dual-licensed under MIT or Apache-2.0, at your option. Copyright (c) 2026 ArtCraft Team and the WordCraft contributors. Required notices are in NOTICE.
Bundled fonts, icons, images and other assets keep their own open licenses; each one is listed with its author, source and license in ATTRIBUTION.md.
The English spelling dictionary and hyphenation come from Grady Ward's public-domain Moby
Hyphenator II word list. Polish spelling reads the Hunspell pl_PL dictionary installed on the system (not bundled), as
do Russian, Portuguese, Czech, Italian, Croatian and Turkish spelling (how to install them:
docs/spelling-dictionaries.md), and
Polish hyphenation the TeX patterns by Hanna Kołodziejska, Bogusław Jackowski and Marek Ryćko (MIT
option). The sample documents and templates are original text written for WordCraft.
The ArtCraft name, wordmark and logos in docs/brand/ are trademarks of the
ArtCraft Team and are not covered by this license. They may be used only unmodified, and only as
part of this repository and WordCraft, under docs/brand/LICENSE-brand.txt.
Forks and modified versions must remove them.
Made by the ArtCraft team and community.