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143 lines
5.6 KiB
Markdown
143 lines
5.6 KiB
Markdown
# Plugin styling — the `styles` capability
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> Building for the redesigned **v3 UI** (`SLOPSMITH_UI=v3` / `/v3`)? v3 uses `fb-*`
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> design tokens and a restructured player chrome with a dedicated plugin-control
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> slot. See **[plugin-v3-ui.md](plugin-v3-ui.md)** for the player-chrome contract
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> plugins must follow in v3.
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Slopsmith serves Tailwind as a **prebuilt** stylesheet
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(`static/tailwind.min.css`), never the runtime Play CDN. The CDN's on-the-fly
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JIT rescanned the DOM on the main thread and dropped ~26% of frames with the 3D
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highway running (slopsmith-desktop#110). See **constitution Principle II**.
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A prebuilt stylesheet only contains the classes the build scanner saw in **core
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source at core build time**. That has a consequence for plugins:
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- Core's build scans bundled plugins on disk, but **a plugin installed at
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runtime** (community / NAS) was never scanned. Its classes — especially
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arbitrary values like `text-[11px]`, `grid-cols-[1fr_auto]`,
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`shadow-[0_0_8px_rgba(0,0,0,.5)]` — are **absent** from the served CSS, so its
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UI renders unstyled.
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The `styles` capability fixes this: your plugin ships its **own** compiled
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stylesheet and declares it in the manifest. The frontend injects one versioned
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`<link rel="stylesheet">` into `<head>` when your plugin activates, covering both
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your screen and your settings panel.
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> You only need this if you use Tailwind classes that aren't guaranteed in core —
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> in practice, **any arbitrary-value class** (`w-[37px]`), or a custom class core
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> doesn't ship. If you use only common core utilities (`flex`, `p-4`,
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> `text-gray-300`, `bg-dark-600`), you can omit `styles` and rely on core's CSS.
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## 1. Declare it in `plugin.json`
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```json
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{
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"id": "my_plugin",
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"name": "My Plugin",
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"version": "1.2.0",
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"screen": "screen.html",
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"script": "screen.js",
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"styles": "assets/plugin.css"
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}
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```
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`styles` is a **plugin-root-relative path that must live under `assets/`** (like
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`screen`/`script`/`routes` are root-relative). It serves through the sandboxed
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`/api/plugins/<id>/assets/...` route, so the file must be at
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`<plugin>/assets/plugin.css`. The injected `<link>` is cache-busted with
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`?v=<version>`, so **bump your manifest `version`** whenever you rebuild the CSS,
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or browsers may serve a stale copy within a session.
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## 2. Build the stylesheet — utilities only, `preflight: false`
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Core already ships Tailwind's base reset (preflight) once. Your plugin must
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**not** re-apply it, or it would double the reset and fight core's styles. Build
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with `corePlugins: { preflight: false }` so your sheet emits **only the utility
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classes your files use**.
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`tailwind.config.js` (in your plugin repo):
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```js
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/** Plugin stylesheet build — utilities only, scanned from this plugin's files.
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* Regenerate assets/plugin.css with: bash build-tailwind.sh */
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module.exports = {
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corePlugins: { preflight: false }, // core owns the single base reset
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content: [
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'./screen.js',
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'./settings.html',
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'./screen.html',
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// add any other file that carries Tailwind classes (e.g. './tour.json')
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],
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theme: {
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extend: {
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// Re-declare any core theme tokens you reference so they compile here.
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colors: {
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dark: { 900: '#050508', 800: '#0a0a12', 700: '#10101e', 600: '#181830', 500: '#1e1e3a' },
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accent: { DEFAULT: '#4080e0', light: '#60a0ff', dark: '#2060b0' },
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gold: '#e8c040',
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},
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fontFamily: { display: ['"Inter"', 'system-ui', 'sans-serif'] },
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},
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},
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// Mirror only the dynamically-built classes your code generates at runtime
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// (Tailwind can't see them textually). Drop this if you have none.
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safelist: [
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{ pattern: /^(bg|text|border)-(dark|accent)(-.+)?$/ },
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],
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plugins: [],
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};
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```
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Input CSS — **`@tailwind utilities;` only** (no `@tailwind base`, that's the
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preflight you're disabling):
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`_plugin.src.css`:
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```css
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@tailwind utilities;
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```
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Build script `build-tailwind.sh` (run at your plugin's release time — the output
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is committed; end users never build):
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```bash
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#!/usr/bin/env bash
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set -euo pipefail
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cd "$(dirname "$0")"
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# Pin the same Tailwind 3.x core uses so output stays diff-stable.
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exec npx -y tailwindcss@3.4.19 \
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-c tailwind.config.js \
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-i _plugin.src.css \
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-o assets/plugin.css \
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--minify
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```
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```bash
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bash build-tailwind.sh # writes assets/plugin.css — commit it
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```
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## 3. Rules (inherited from the constitution)
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- **No Play CDN, no runtime CSS JIT** — anywhere, ever. Same rule that binds core.
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- **`preflight: false`** — utilities only; core ships the one base reset.
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- **`styles` under `assets/`** — it serves through the sandboxed asset route;
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`..`, absolute paths, and NUL bytes are rejected by `safe_join`.
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- **Bump `version` on every CSS rebuild** so the `?v=` cache-buster fetches fresh.
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- Plugins without `styles` are unaffected and inject no `<link>`.
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## How it works (for reference)
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- The loader derives a manifest-only `has_styles` boolean and passes the `styles`
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path through to `/api/plugins` — no plugin code is imported
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(`plugins/__init__.py::_nav_entry`).
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- The frontend (`static/app.js::_injectPluginStyles`) injects one
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`<link rel="stylesheet" data-plugin-id data-plugin-version
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href="/api/plugins/<id>/assets/plugin.css?v=<version>">` (the `styles` value —
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e.g. `assets/plugin.css` — appended to `/api/plugins/<id>/`) into `<head>`, **before** the
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screen markup so styles are present on first paint. It's deduped by version: a
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plugin upgrade swaps the old `<link>` for the new one; re-activation never piles
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up duplicates.
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- The stylesheet is served by the existing
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`/api/plugins/<id>/assets/<path>` route as `text/css`.
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