kern-code 0.1.0

Kern — a calm, complete desktop code editor (Tauri 2 + React + Monaco)
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Kern

A calm, minimalist desktop code editor — in the spirit of Zed, but quieter. A fixed warm-graphite canvas, all-monospace chrome, and three syntax-only themes (Arctic, Grape, Amber) that recolor code without ever touching the canvas.

Built with Tauri 2 (Rust) + React 19 / TypeScript / Vite + Monaco.

Features

  • Zed-style chrome: integrated title bar with custom window controls, nav arrows, a file-path breadcrumb, and a minimap. File tree docks right.
  • Open a folder; lazy, expandable file tree
  • Tabs with dirty indicators; open tabs persist across restarts
  • Monaco editor: ~50 languages highlighted, ligatures, generous line height
  • Three themes applied to both the CSS chrome and Monaco, kept in sync
  • Command palette (⌘⇧P) + Go-to-File (⌘P) with fuzzy matching
  • Settings via the palette: font family/size, line height, tab size, minimap, word wrap, ligatures, relative line numbers, cursor blink — all persisted
  • Addons page (⌘⇧X): toggle editor features, switch themes, see which language servers are installed (with install commands)
  • Source Control (⌘⇧G): branch + changed files, click to open
  • Git signal: current branch in the status bar + per-line gutter change markers
  • LSP completion + diagnostics via real language servers (Pyright, tsserver, rust-analyzer, gopls, clangd) when the binaries are on PATH
  • About & Settings panel (⌘,), Zen mode, reduced-motion aware

Develop

pnpm install
pnpm tauri dev      # launches the desktop app with HMR

Build

pnpm tauri build              # produces a native bundle
pnpm tauri build --debug --no-bundle   # fast standalone debug binary

Note (Linux/WebKitGTK): pnpm tauri dev can occasionally render a blank window on first load — a WebKitGTK bug under Vite's native-ESM dev server (internallyFailedLoadTimerFired). Just reload/relaunch, or run a built binary (pnpm tauri build --debug --no-bundle → src-tauri/target/debug/kern), which serves a single bundle and is unaffected.

Keyboard shortcuts

Action Shortcut
Save ⌘/Ctrl S
Command palette ⌘/Ctrl ⇧ P
Go to file ⌘/Ctrl P
Toggle sidebar ⌘/Ctrl B
Close tab ⌘/Ctrl W
Next / prev tab ⌘/Ctrl ⌥ → / ←
Source control ⌘/Ctrl ⇧ G
Addons ⌘/Ctrl ⇧ X
About & settings ⌘/Ctrl ,
Increase / decrease font ⌘/Ctrl + / −
Cycle theme ⌘/Ctrl K, then T

Language servers (optional)

LSP features light up automatically when the relevant server is installed and on PATH:

Language Server
Python pyright-langserver (or basedpyright-langserver)
TypeScript typescript-language-server
Rust rust-analyzer
Go gopls
C / C++ clangd

Architecture

  • React UI — layout, theming, command palette, Monaco, the LSP bridge.
  • Rust backend — filesystem (read/write/watch), directory walking, git status via git2, and spawning language servers (bridged stdio ↔ WebSocket).
  • Frontend ↔ Rust over Tauri IPC (invoke commands + emit events).

See CODE_EDITOR_SPEC.md for the full design system and build spec.

Notes

  • Settings persist on disk via tauri-plugin-store (not localStorage).
  • Fonts: JetBrains Mono (SIL OFL), bundled under public/fonts.