AGENTS.md

8bitMyGoUI: pixel-art components in the manner of 16-bit consoles, for MyGo native UI. Go module git.zacharyzhang.com/ZacharyZhang-NY/8bitMyGoUI. Progress truth: TASKS.md. Requirements: PRD.md and docs/prd/components-*.md.

Stack

Item	Value
Go	1.27.1
MyGo	`github.com/egoist/mygo v0.2.10`, pinned in go.mod
Font	Ark Pixel Font 12px proportional zh_Hans v2026.09.25 (OFL-1.1, `pixel/OFL.txt`). Rebuild: `go run ./tools/fontpack -in ark-pixel-12px-proportional-zh_hans.bdf` (BDF sha256 `535f7024…8c86`)
QR	`rsc.io/qr v0.2.0` (BSD-3), encoder behind `display.QRCode`
Web	`cmd/web` built with `GOOS=js GOARCH=wasm`; the browser runs the gallery under `ui.Tester` and blits frames to a canvas
Hosting	Cloudflare Workers static assets from `web/dist`; code on Gitea `git.zacharyzhang.com`

Read MyGo source before using an API: $(go env GOMODCACHE)/github.com/egoist/mygo@v0.2.10 (ui/*.go, docs/ui/*.md). Never guess.

Layout

pixel/             engine: settings, palette, canvas, dither, font, sprites, clock, editor, messages
icon/              hand-placed sprites
<category>/        one component per file, package = folder name
gallery/           registry, demos (demos_<category>.go), app view, invariant tests
cmd/gallery/       native window
cmd/web/           js/wasm host
web/               shell, glue JS, build.sh, deploy.sh, wrangler.jsonc, _headers, Playwright tests; web/dist is build output
tools/fontpack/    BDF to font12.bin
internal/archtest/ import and API rules

Tiers

Imports point down only. Same-tier imports are forbidden. internal/archtest enforces it.

0 pixel · 1 icon · 2 layout, text, display · 3 input, feedback · 4 navigation, data, overlay, datetime, chart, fx · 5 game, chat, media, code, account, files, project, shop, agent, desk, tabletop · 6 gallery · 7 cmd

Style rules

Draw on the dot grid through pixel.Canvas. One dot is Dot DIPs.
Name palette slots, never colors. Every pixel must be a palette color.
Only axis-aligned rectangles reach the screen: no radius, path, shadow, gradient, opacity, scaled bitmap.
Tone comes from Bayer dither between two slots.
Animation steps through Canvas.Step, Canvas.Busy or Kit.Tick. No easing.
Text through the pixel font only.

MyGo rules

Use Bases, containers, List, GridView, Outline, Router, Overlay, DialogBase, PopoverBase, FocusGroup, Local, HandleInput, TextCaret, Shortcut, clipboard. Full list: PRD §2.4.
Never call styled widgets, Background, Border*, Radius, Shadow, Gradient, Opacity, Stripes, Tooltip, Menu, ContextMenu, Transition, Animate*, Loop, c.Toast*, or painter calls other than Fill and Clip. Only pixel calls After.
A disabled element never paints. Interactive components draw on an enabled shell; the base inside fills it, carries behavior, label and Disabled, and turns MyGo's focus ring off.

Component rules

Signatures and results: PRD §5.1. Zero options give the default look. Sizes in options are dots.
k := pixel.K(c) once per component; layout sizes through k.D(n).
Containers take content as a final func(); interactive results are NameResult.
A Clicked, Shortcut, Changed or drag during the build makes MyGo build the frame again, so what they change shows at once. State changed any other way after its element was built (Pressed, Edit.Changed) is read at paint time.
Never call Selected: MyGo paints it in the accent color. Radios are CheckboxBase with RoleRadio.
Clip only boxes that sit on whole dots; split widths with whole-dot shares, not equal Grow. Grow starts from zero size, so never use it on a content-sized child.
Row builders that MyGo runs during layout (List, GridView, Outline) go through pixel.Lazy(c, row).
Single-key shortcuts only while pixel.Typing(c) is false; MyGo routes shortcuts before a focused field.
Copy shown by a component comes from k.Msg; business copy comes from the caller.
Fail fast: panic on programmer errors such as bad options. Never swallow an error.
Composites log state changes: slog.Debug("8bit: <component> <event>", …). Never log secrets.
No cross-frame *ui.Element caching. No goroutines touching elements.
Files under 500 lines. Comments: one line, ten words at most, only when needed. No dead code, no versioned APIs.

Gallery entry

Each component adds one Entry in gallery/demos_<category>.go: ID, Name, Zh, Category, Summary, Demo. The demo reports every event through log. The code panel shows the demo function's own source.

Tests

go vet ./... && go test ./... before reporting done.
Behavior tests drive ui.Tester and assert values.
gallery checks every entry under every palette: only palette colors, whole dots. PIXEL_SHOTS=<dir> go test ./gallery -run TestInvariants writes PNGs for visual review.
Web: npm install && npm test in web/ builds web/dist and runs Playwright on a local server; BASE_URL=<url> npx playwright test checks a deployed site. Tests read window.__8bit (ready, stats(), texts(), page(), find(label), log).

Deploy

npm run deploy in web/ (clean tree only): builds, uploads a Worker version, runs Playwright on its preview URL, promotes it to 100%, runs Playwright on https://8bitmygoui.zhangyanghaha0407.workers.dev.
Rollback: npx wrangler rollback <version-id> in web/; npx wrangler deployments list shows versions.
Scripts and wasm sit under a/, named by content hash, and _headers makes them immutable; index.html revalidates. Never cache a path whose content can change.

Review

Each TASKS.md item is reviewed in a Herdr pane split to the right, by codex --yolo -m gpt-6.1-sol -c model_reasoning_effort=high -c service_tier=fast. At most three rounds. The reviewer reports defects against PRD and this file, ends with VERDICT: PASS or VERDICT: FAIL, and does not reject work for missing enhancements.

Secrets

The Gitea token lives only in the environment (GITEA_TOKEN). Never write it to a file, a commit or a log.

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