260 lines
24 KiB
Markdown
260 lines
24 KiB
Markdown
# gpui-native-kit — Project Plan
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Rev 5 (2026-10-28). Changes from rev 4: the workspace is split into focused crates — `theme`, `icons`, `core`, and sibling crates for advanced elements (`editor`, `data`, …) — with per-component cargo features so applications enable only what they use. System icons are now in scope: semantic roles resolved to SF Symbols / Segoe Fluent Icons / freedesktop icons per platform, with a bundled Lucide fallback. Everything else (empty-project reset, own lean implementations, theme engine as the product) stands.
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## 1. Vision
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GPUI components that feel native to the OS they run on — macOS, Windows 11 (WinUI), GNOME, KDE, Omarchy — with a designed neutral fallback for unknown systems. Every color, radius, spacing, metric, and icon comes from engines that read the running system or a user-supplied theme. The theme and icon engines are the product; components are their proof.
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Consumption is flexible: small focused crates, per-component cargo features, and a thin optional facade. A hello-world app can depend on `gpui-native-core` with two features; a full app can depend on the `gpui-native-kit` facade with `--all-features`.
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## 2. Evaluated foundations (2026-10-28)
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| Crate | What it is | Verdict | What we take |
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| --- | --- | --- | --- |
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| gpui-kit (longbridge) | Unstyled `base` behavior layer + styled component library | Dropped: over-engineered base; review-gated porting too slow; upstream pins `gpui-pre` snapshots | Nothing; previous ports reverted |
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| gpuikit (iamnbutler) | Web/SwiftUI-style toolkit (editor, input, keymap, markdown, selection, a11y modules) on `gpui-unofficial` | Not a foundation: builds on the `gpui-unofficial` crates.io distribution (conflicts with D3); generic theme system with no per-OS native look | Component API ergonomics; showcase/gallery pattern |
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| bezel (crabtalk) | SwiftUI-lean library; style flows through the environment — `Theme::of(cx)` + catalog traits, zero style parameters, `Brand`/`Tint` hue re-theming; own gpui fork (`bezel-gpui`) | Not a foundation: gpui fork (conflicts with D3); one visual language (macOS-leaning HIG), not per-OS native | Environment-first styling: components read the theme global at paint time and take no color/size parameters; `Brand`-style hue overrides inform custom themes |
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| zeron (zeronsh) | Production gpui app (coding-agent control plane; crates: ui, theme, text, syntax, term, …) | Not a foundation — an application, not a library | Existence proof that gpui scales; app-level patterns for data-heavy screens |
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Decision D15: we depend on no UI toolkit and port nothing. These crates (plus native-theme, D1) are read for API and design ideas only — and always simplified, never mirrored 1:1. When in doubt, ship the smaller API.
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## 3. Background facts (verified)
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- **GPUI install shape** — the only framework dependency:
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```toml
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gpui = { git = "https://github.com/zed-industries/zed", rev = "ec86047d67acd6fddd81392f44ed6ebcc6e7f531" }
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gpui_platform = { git = "https://github.com/zed-industries/zed", rev = "ec86047d67acd6fddd81392f44ed6ebcc6e7f531", features = ["font-kit"] }
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```
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`font-kit` is required on macOS for glyph rasterization; Linux needs `wayland` and/or `x11`; Windows needs nothing. No `gpui-pre`, no forks, no `gpui-unofficial`. Toolchain 1.98.1 via `rust-toolchain.toml` (matches zed at the pinned rev; verified building on this machine). Bumping the pin is a deliberate act: re-verify, fix drift, note it in the bump commit message.
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- **native-theme design (the blueprint we adapt, not a dependency):** sparse TOML-shaped `Theme` (Option fields) resolves into a fully populated `ResolvedTheme`; bundled presets; `AccessibilityPreferences`; thin per-toolkit connectors. Its GPUI connector targets gpui-component — a case study only.
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- **xdg-desktop-portal `Settings` (verified against the spec):** `org.freedesktop.appearance` standardizes `color-scheme` (u), `accent-color` ((ddd) RGB 0–1), `contrast` (u), `reduced-motion` (u), with `SettingChanged` — one DBus interface covering mode, accent, contrast, and reduce-motion across GNOME, KDE, and generic Linux.
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- **Omarchy theme contract (verified against the manual and the shipped `tokyo-night` theme):** active theme is `$HOME/.local/state/omarchy/current/theme/colors.toml` with `theme.name` beside it (legacy `~/.config/omarchy/current`; `current/theme` is a symlink into the theme set). `colors.toml` states `mode = "dark" | "light"` plus semantic keys — `accent`, `selection`, `muted`, `background`/`dark_background`/`darker_background`/`lighter_background`, `foreground`/`dark_foreground`/`light_foreground`/`bright_foreground`, and `red`/`yellow`/`orange`/`green`/`cyan`/`blue`/`magenta`/`brown` with `bright_*`; the ANSI `color0..15` format is an accepted alternative.
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- **Platform icon systems:** macOS SF Symbols — thousands of template glyphs, runtime lookup via `NSImage(systemSymbolName:)` rendered at a requested size/weight; Apple's license forbids redistributing the set, so it is used at runtime only, never bundled. Windows 11 Segoe Fluent Icons — a system font addressed by codepoint. Linux (and Omarchy) — the freedesktop icon-theme spec: lookup across the active theme (Breeze, Adwaita) and hicolor. Lucide (ISC) is the bundled offline fallback everywhere else.
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- **Prior art — gpui-omarchy (huacnlee, MIT):** validates the Omarchy adapter design: read `colors.toml` + `theme.name`, watch filesystem events for palette edits and theme-symlink replacement, `follow_system` / explicit `apply` to pause/resume following, whole-palette fallback to Tokyo Night when files are missing or invalid.
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## 4. Architecture
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### 4.1 Workspace layout (Phase A)
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```text
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gpui-native-kit/ # repo root = workspace root
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├── Cargo.toml # [workspace]; root package = facade
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├── rust-toolchain.toml
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├── AGENTS.md
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├── docs/PLAN.md
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├── src/lib.rs # gpui-native-kit: thin facade (re-exports, feature-driven)
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├── crates/
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│ ├── theme/ # gpui-native-theme: the native theme engine
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│ ├── icons/ # gpui-native-icons: system icons + bundled fallback
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│ ├── core/ # gpui-native-core: components every app needs
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│ │ # (one cargo feature per component)
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│ └── editor/ # gpui-native-editor: created when wave 2 needs it (D12)
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└── examples/
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└── gallery/ # showcase; a page per component + theme/icon inspector
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```
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Advanced crates (`data` for Table/Tree/List, `charts`, `pickers`) are created on demand when their wave starts — not speculative scaffolding.
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```mermaid
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graph TD
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FAC[gpui-native-kit facade — optional] --> CORE[gpui-native-core]
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FAC --> FUT[editor / data / …]
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CORE --> T[gpui-native-theme]
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CORE --> I[gpui-native-icons]
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T --> P[gpui + gpui_platform — zed, pinned rev]
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I --> P
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```
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One-way, no cycles. Nothing depends on `gpui-component`, `gpui-kit`, `gpuikit`, `bezel`, or `native-theme`. Applications may depend on `gpui-native-core` directly and skip the facade.
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### 4.2 Feature model
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- **One feature per component** in `core` (`button`, `checkbox`, `switch`, `radio`, `toggle`, `link`, `slider`, `progress`, `avatar`, `input`, `popover`, `tooltip`, `menu`, `dialog`, `toast`, `list`, `tabs`, …). `default = ["full"]`; lean apps use `default-features = false` + the features they want.
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- Features **gate whole modules only** (`#[cfg(feature = "…")] pub mod button;`) and are additive. A component that composes another declares the dependency in Cargo.toml (`dialog = ["button"]`). No cfg logic may cross modules.
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- Facade features map to crates: `core` (default), `editor`, `data`, …
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- Shared helpers promoted per D16 live in an ungated `common` module so every feature combination sees them.
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- CI checks three points, not a full matrix: default, `--no-default-features`, `--all-features`, plus a compile check of each feature alone.
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### 4.3 Component design
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- **Controlled components:** the owner passes the current value, callbacks report intent, the owner updates state and calls `cx.notify()`. No second source of truth.
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- **Value-like controls** are `#[derive(IntoElement)]` + `RenderOnce`; stateful ones are `Entity<XxxState>` the application owns.
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- **No style parameters** (bezel's model): a component reads the theme global at paint time and takes zero color/size arguments. Overrides are gpui style modifiers chained by the caller.
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- **Behavior is inline.** Activation, focus, keyboard, dragging, and a11y are written per component with gpui primitives (`Interactivity`, `FocusHandle` + `tab_stop(true)`, `actions!`, a11y builders). A helper is promoted to shared `common` only when a third component needs it — no pre-built behavior layer.
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- **APIs are our own**, shaped by what our components need; inspiration from other crates is distilled, never copied 1:1.
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- Each component has a named native reference per platform (NSButton / WinUI Button / Adwaita / Breeze) recorded on its gallery page; "native feel" is reviewed against those references.
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- Naming seams per AGENTS.md: `is_`/`has_` readers, `with_` builders, `set_` mutation, `on_` callbacks, `State`/`Delegate` suffixes, stable domain-derived `ElementId`s.
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### 4.4 Icons (`crates/icons`)
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- **`IconRole`** — a semantic enum of the glyphs UI actually needs (~25 to start): chevrons, check, close, plus/minus, search, folder, warning/info/success, copy, arrow-left/right, calendar, clock, settings, dots-horizontal, … Components and apps reference roles, never glyph names.
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- **Resolver cascade per platform**, behind one `Icon` element:
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- macOS: SF Symbols via `NSImage(systemSymbolName:)`, rasterized through AppKit at (size, weight, appearance, tint) and cached; never bundled.
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- Windows: Segoe Fluent Icons codepoints rendered as text (system font).
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- Linux/Omarchy: freedesktop icon-theme lookup (active theme → hicolor), SVG painted via gpui's `svg()`.
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- Fallback everywhere: a bundled Lucide subset (ISC; attribution in NOTICE) — ships first so components work before platform resolvers land.
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- Public API stays tiny: `icon(role)` → element with `.size(...)`; tint defaults to theme tokens. A missing glyph logs once and falls back — never panics.
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- Gallery page: icon browser showing every role resolved on the current platform.
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### 4.5 Theme pipeline
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```mermaid
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graph TD
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OS[Adapters: macOS / Windows 11 / GNOME / KDE / Omarchy / fallback] --> ST[SystemTheme normalized snapshot]
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PR[ThemeDefinition presets + user overlays] --> RS[resolve]
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ST --> RS
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RS --> RT[ResolvedTheme + AccessibilityPreferences]
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RT --> TK[token projection onto the Theme global]
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TK --> WIN[all windows repaint]
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EVT[runtime change events] -->|re-read, re-resolve, re-install| TK
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```
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1. **Read** — one adapter per platform produces a normalized `SystemTheme` (mode, accent, semantic palette, accessibility flags, style hint).
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2. **Detect** — capability cascade: Omarchy marker → KDE (`kdeglobals` present) → portal reachable (GNOME/generic Linux) → fallback. macOS/Windows by compile target.
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3. **Resolve** — overlay chain: platform reader → bundled preset → user theme → runtime overrides → accessibility adjustments. Pure function, unit-testable without a GUI.
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4. **Project** — `ResolvedTheme` → the token structs components consume, installed on the theme `Global`.
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5. **Observe** — `ThemeWatcher` forwards real change events (distributed notifications, WinRT `ColorValuesChanged`, portal `SettingChanged`, inotify on KDE/Omarchy files); each event re-runs read → resolve → project → repaint.
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## 5. Theme engine (`crates/theme`)
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### 5.1 Architecture
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- **`ThemeSource` trait** — one adapter per platform: `snapshot() -> SystemTheme` plus `watch(callback)`. Adapters are thin over parseable payloads (ini text, registry dumps, portal replies) so parsing is fixture-testable on any OS.
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- **`SystemTheme`** — normalized snapshot: mode, accent, semantic palette, high-contrast, reduce-motion, reduce-transparency, text-scaling, style hint, platform identity.
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- **`ThemeDefinition`** — sparse TOML-serializable `Option`-field struct; bundled presets and user themes share one schema.
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- **`ResolvedTheme`** — fully populated; `resolve(system, definitions…, prefs)` is pure.
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- **`AccessibilityPreferences`** — text scaling multiplies font sizes (through rem, all rem-relative sizing); reduce-motion forwards to GPUI; reduce-transparency drops overlay backdrops; high-contrast sharpens borders and removes subtle fills.
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- **`ThemeWatcher`** — owns adapter watches, drives the observe step.
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### 5.2 Role mapping
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| Token role | Source |
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| --- | --- |
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| `background` / `foreground` | window background / default text |
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| `surface` / `surface_foreground` | cards / secondary areas |
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| `primary`, `secondary`, `accent` | button + selection colors (macOS: accent-derived) |
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| `muted` | secondary text and hover shades |
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| `destructive` | danger role |
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| `border` / `input` | control border line / field background |
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| `ring` | focus ring |
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| `selection` | text selection background |
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Omarchy `colors.toml` maps almost 1:1: `lighter_background` → `surface`, `dark_background`/`darker_background` → elevation depth, `dark_foreground` → muted foreground, `accent` → `primary`/`accent`/`ring`, `red` → `destructive`, `green`/`yellow`/`orange` → success/warning. Every mapping lives in one module; never literals. Tests assert finite, distinct, semantically sane tokens for every preset × mode.
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### 5.3 Platform matrix
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| Target | Detection | Sources read | Live changes |
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| --- | --- | --- | --- |
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| macOS | compile target | `NSColor` semantic palette (`windowBackgroundColor`, `labelColor`, `controlColor`, `controlAccentColor`, `selectedTextBackgroundColor`, `keyboardFocusIndicatorColor`, …) in the effective appearance via `objc2-app-kit`; `NSWorkspace` accessibility flags | distributed notifications + GPUI appearance events |
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| Windows 11 (WinUI) | compile target | WinRT `UISettings` (`AccentColor`, `AccentLight1–3`, `AccentDark1–2`, `Background`, `Foreground`), `TextScaleFactor`, `AccessibilitySettings` high-contrast; `Personalize` registry fallback | `UISettings.ColorValuesChanged` |
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| GNOME / generic Linux | portal reachable | portal `org.freedesktop.appearance` (`color-scheme`, `accent-color`, `contrast`, `reduced-motion`); `gsettings` fallback | portal `SettingChanged` |
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| KDE | `kdeglobals` present | `kdeglobals` color groups + scheme hash + accent; portal for mode/accent | inotify on `kdeglobals` |
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| Omarchy | `~/.local/state/omarchy` or `~/.config/omarchy` marker | `current/theme/colors.toml` + `theme.name` (semantic keys or ANSI `color0..15`); portal for contrast/reduced-motion | inotify on the `current` dir (palette edits + symlink replacement) |
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| Fallback / unknown | none of the above, or reader failure | bundled neutral light/dark theme | manual only |
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### 5.4 Accent ramp engine
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Every target supplies one accent color (or a stated ramp). Where the platform states shades (WinUI `AccentLight1–3`/`AccentDark1–2`, KDE scheme ramps) use them as-is; elsewhere derive the state shades components need (hover, pressed, selected, disabled, subtle fills) in OKLCH with fixed lightness/chroma offsets toward the background or foreground, hue preserved. Derived colors compute once per resolve, never per frame.
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### 5.5 Native metrics
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Native feel is half geometry. Per-platform tables for: control heights and paddings, corner radii (WinUI control vs card rounding; macOS control radii), font fallback lists resolved through `.SystemUIFont` (SF Pro / Segoe UI Variable / Adwaita Sans / Noto Sans — no fonts bundled), focus-ring policy (macOS keyboard ring, WinUI two-layer ring, GTK outline), scrollbar style (overlay vs inline), popup elevation and menu metrics. Values are transcribed from each toolkit's reference metrics and verified with side-by-side screenshots (macOS in Phase B, the rest in Phase F).
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### 5.6 Custom themes
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- `ThemeDefinition` TOML: presets and user files share one schema; may override any role or metric, or just the accent (`accent = "#7c3aed"` → full derived ramp).
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- Merge priority: platform reader → preset → user file(s) → runtime overrides → accessibility adjustments. `mode = "system" | "light" | "dark"` forces a mode.
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- Sources: `--theme <preset|path>` flag, a config directory scanned at startup, and an `apply` API for in-app settings UIs.
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- Omarchy interop: the loader accepts Omarchy `colors.toml` (semantic or ANSI) directly, so community themes drop in unchanged.
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- Live reload via `notify`; parse errors surface as a notification, never a panic.
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- Follow-mode API: `follow_system(cx)` keeps adapting to system changes; explicit `apply` detaches; `system_or_default()` takes a one-time snapshot.
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### 5.7 Implementation vehicles
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`objc2` + `objc2-app-kit` (macOS), `windows` (WinRT `UISettings`), `zbus` (portal DBus), `notify` (file watches), `serde` + `toml` (definitions) — all behind the `ThemeSource` seam so the engine core stays platform-free and testable.
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### 5.8 What we do differently from native-theme
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Real semantic colors per platform (`NSColor` / `UISettings` / portal) instead of hardcoded approximations; OKLCH accent-ramp derivation; native metrics as a first-class deliverable; Omarchy as a first-class target; a designed neutral fallback; custom themes with overlay merge priority and live reload; a role-minimal token set instead of a 139-field toolkit mapping.
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## 6. Component roadmap (written from scratch)
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| Wave | Crate | Components |
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| --- | --- | --- |
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| 1 — controls | core | Button, Checkbox, Switch, Radio + RadioGroup, Toggle, Link, Slider, Progress, Avatar; plus the `IconRole` catalog + Lucide fallback |
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| 2 — input | core | Input (single-line first, then multiline), NumberInput. String buffer + `unicode-segmentation` word movement; the field owns its own selection. Multiline editing may seed `crates/editor`. |
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| 3 — overlays | core | Popover, Tooltip, Menu, Dialog, AlertDialog, Sheet, Toast |
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| 4 — data & navigation | data (new) | List, Table, Tree, Tabs, Sidebar |
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| 5 — pickers | pickers or data (decide at wave time) | Calendar/DatePicker, TimeField, ColorPicker |
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| editor | editor (new) | Text/code editor, syntax highlighting (D12) |
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Deferred until a real need: Markdown/TextView, Dock, VirtualList, window-wide text selection, a motion system (use gpui's built-in animations first), charts.
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## 7. Milestones
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| Phase | Scope | Acceptance |
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| --- | --- | --- |
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| A — scaffold (next) | Workspace per §4.1: theme stub, icons crate (`IconRole` + Lucide fallback), core crate with feature scaffolding (zero components), facade, gallery shell, CI incl. feature checks | `gallery` opens a window reading the theme global; `core` builds at default / no-default / all / each-feature-alone |
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| B — theme engine core | Token model + resolve + presets (neutral fallback, tokyo-night) + macOS source + `ThemeWatcher`; gallery theme inspector | Button + Checkbox painted from live macOS system tokens; flipping system appearance repaints live |
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| C — controls | Wave 1 in `core`, one feature each; macOS SF Symbols resolver behind the icon seam | Each control: tests + gallery page + native-reference screenshots; icon browser shows per-role resolution |
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| D — input | Wave 2 | Single-line input with cursor, selection, clipboard; NumberInput |
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| E — overlays | Wave 3 | Focus trapping and escape/dismiss semantics per overlay |
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| F — platforms + data | `crates/data` + Windows/GNOME/KDE/Omarchy theme sources + Segoe Fluent/freedesktop icon resolvers | Side-by-side gallery screenshots per platform |
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| G — pickers + polish | Wave 5 → 0.1; start `crates/editor` if wanted | — |
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Gate for every phase: `cargo fmt --check`, `cargo clippy --workspace --all-targets -- -D warnings`, `cargo test`, gallery smoke run.
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## 8. Testing
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Pure tests for resolve/overlay chain, payload parsing (fixtures), icon resolution tables, and metrics; context tests for the theme global lifecycle; headless UI tests for activation, controlled round-trips, focus, disabled; gallery smoke run. GPUI executor timers in tests. Only meaningful tests — state semantics, a11y mapping, invariants (AGENTS.md Tests rule).
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## 9. Licensing
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- All code in this repo is original: Apache-2.0 (D6).
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- gpui: Apache-2.0 dependency, nothing copied.
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- Lucide icons: ISC — bundled subset with attribution in NOTICE.
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- SF Symbols and Segoe Fluent Icons: used through the operating system at runtime only; never extracted or redistributed.
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- native-theme, gpui-omarchy, gpuikit, bezel: inspiration only; no code copied. If that ever changes, respect their licenses.
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## 10. Risks
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| Risk | Mitigation |
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| --- | --- |
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| zed `main` churns gpui APIs | Pinned rev; bumps are deliberate (re-verify, fix, note in commit message); CI catches drift early |
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| Writing our own input/editor is the biggest lift | Single-line first; no LSP/highlighting/composition until needed; selection stays private to the field |
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| Per-component features multiply configurations | Features gate whole modules, additive only; CI checks default / none / all / each-alone, not the full matrix |
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| Platform icon lookups vary (missing fonts, themes) | Resolver cascade always ends in the bundled Lucide fallback; missing glyph logs once and falls back |
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| Per-OS readers are a maintenance burden | Thin readers over parseable payloads + fixture tests; graceful fallback chain (system → preset → fallback theme) |
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| "Native feel" is judgment | Named native reference per component; per-platform screenshot review each phase |
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| Omarchy `colors.toml` key set evolves | Parse tolerantly (unknown keys ignored, missing keys fall back); track the theme-set script each release cycle |
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| Portal `accent-color` absent on older desktops | Treat as unset (spec-defined); fall back to gsettings/KDE accent, then ramp from a neutral accent |
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## 11. Decisions
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| # | Decision |
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| --- | --- |
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| D1 | Custom theme engine inspired by native-theme; no `native-theme` dependency |
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| D3 | gpui from zed's repository only, pinned rev; no `gpui-pre`, no forks, no `gpui-unofficial` |
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| D4 | Desktop only; no WASM |
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| D6 | Apache-2.0 for this repo's code |
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| D7 | `gpui-native-kit` stays the thin facade package name; it only re-exports crates behind features. Applications may depend on `gpui-native-core` directly |
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| D8 | macOS first, then Windows 11 (WinUI), then GNOME → KDE → Omarchy; fallback theme from day one |
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| D11 | Bundled presets: neutral `fallback`, `tokyo-night`, per-platform presets for testing readers; Omarchy files load as presets too |
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| D12 | Editor deferred; `crates/editor` is created when wave 2's multiline editing or highlighting demands it |
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| D13 | Accent shades hybrid: stated platform ramps where available (WinUI, KDE), OKLCH derivation elsewhere |
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| D14 | Custom-theme live reload via `notify` |
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| D15 | No porting, no UI-toolkit dependencies; inspiration only, always simplified — never mirrored 1:1 |
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| D16 | No separate behavior crate; behavior lives in each component; shared helpers promoted at the third use |
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| D17 | `UPSTREAM.md` removed; provenance = §3 pins + git history |
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| D18 | Crate split for consumption: `core` (every-app components) → `editor`, `data`, … (advanced) → thin `gpui-native-kit` facade; one cargo feature per component, additive, module-gated |
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| D19 | System icons via semantic `IconRole`s with per-platform resolvers (SF Symbols / Segoe Fluent Icons / freedesktop) and a bundled Lucide fallback; platform glyph sets are used at runtime only, never bundled |
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Dropped from rev 3: D2, D5, D9 (port-era decisions). D10 (no icon bundling) is superseded by D19.
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## 12. Immediate next steps
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1. ~~Phase A scaffold~~ ✅ — workspace, toolchain pin, CI, theme seed (neutral light/dark presets + `Theme` global + appearance sync), icons crate (`IconRole` + Lucide fallback + `IconAssets`), core feature scaffolding, facade, gallery shell.
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2. Phase B theme engine core, macOS adapter first.
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3. Then wave 1 controls.
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