feat(macos): Alacritty follows system light/dark appearance
New setup — due for review after you run darwin-rebuild switch and live with it for a few days. See CLAUDE.md (Alacritty) and assets/alacritty/README.md. - HM: import active-colors.toml + Catppuccin latte/mocha fragments - nix-darwin: launchd.user.agents.alacritty-system-theme + PATH helper - fish: background sync on Darwin; theme.sh no longer rebuilds for Alacritty - Remove switch-alacritty-theme.sh (sed + darwin-rebuild per toggle) Made-with: Cursor
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# Unified Theme Switching
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# Alacritty + system appearance (macOS)
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Unified theme switching that works across platforms (WSL and macOS) for Neovim, Alacritty, and Windows Terminal.
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Alacritty follows **System Settings → Appearance** automatically. No `darwin-rebuild` when you change light/dark.
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**This solution uses a single `theme` command that detects the platform and switches themes appropriately.**
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## How it works
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## How It Works
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1. Home Manager installs Catppuccin palettes as `~/.config/alacritty/catppuccin-{latte,mocha}-colors.toml` and a generated `alacritty.toml` that sets `general.import` to `active-colors.toml`.
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2. `scripts/alacritty-sync-system-theme.sh` copies the matching palette to `active-colors.toml`. Alacritty’s `live_config_reload` picks it up immediately.
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3. **nix-darwin** runs that script from a user LaunchAgent every 30s (`nixos/hosts/macos.nix`: `launchd.user.agents.alacritty-system-theme`). It is also installed on `PATH` as `alacritty-sync-system-theme`.
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4. **Fish** runs the same script in the background when you open an interactive shell on Darwin, so changes apply quickly without waiting for the next poll.
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1. The `theme` command detects the platform (WSL vs macOS)
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2. **On WSL:** Updates Neovim, Windows Terminal, and Windows system theme
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3. **On macOS:** Updates Neovim and Alacritty themes via Nix configuration
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4. Uses the same `nvim_color_scheme` file for Neovim on both platforms
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## Optional manual LaunchAgent
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## Setup
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If you are not using the nix-darwin agent, you can load `assets/launchd/com.user.alacritty-theme-sync.plist` (adjust paths if needed). **Do not** load both the nix-darwin agent and this plist or you will run two pollers.
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1. **The configuration is already set up!** The `theme` command is available as a fish alias.
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If you previously used the old plist label `com.user.alacritty-theme-sync` and switch to nix-darwin only:
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2. **To switch themes, use the unified command:**
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```bash
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theme light # Switch to light theme
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theme dark # Switch to dark theme
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theme toggle # Toggle between light and dark themes
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theme status # Show current theme status
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```
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## Usage
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### Unified Theme Command
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```bash
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# Switch to light theme (works on WSL and macOS)
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theme light
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launchctl bootout "gui/$(id -u)" ~/Library/LaunchAgents/com.user.alacritty-theme-sync.plist 2>/dev/null || true
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```
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# Switch to dark theme (works on WSL and macOS)
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## `theme` command (Neovim / WSL)
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The fish alias `theme` still updates `~/.local/share/nvim_color_scheme` (and Windows Terminal on WSL). On macOS, **Alacritty ignores** `theme light|dark` for terminal colors—it only follows System Settings. Neovim stays on whatever you set with `theme`; the Alacritty sync script does not touch the nvim file.
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```bash
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theme light # Neovim (+ WSL terminal); macOS Alacritty unchanged (uses Appearance)
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theme dark
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# Toggle between light and dark themes
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theme toggle
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# Show current theme status
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theme status
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```
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### What Gets Updated
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**On WSL:**
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- Neovim theme (via `~/.local/share/nvim_color_scheme`)
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- Windows Terminal settings
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- Windows system theme
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- Windows sound scheme
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**On macOS:**
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- Neovim theme (via `~/.local/share/nvim_color_scheme`)
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- Alacritty theme (via Nix configuration)
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### Manual Configuration (macOS only)
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You can also manually edit `nixos/home/danny/home.nix` and change:
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```nix
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isLightTheme = true; # for light theme
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isLightTheme = false; # for dark theme
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```
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Then run: `cd nixos && sudo darwin-rebuild switch --flake .#Daniel-Macbook-Air`
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## Files
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- `scripts/theme.sh` - **Main unified theme switching script**
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- `scripts/switch-alacritty-theme.sh` - Alacritty-specific theme switching (used by theme.sh)
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- `scripts/detect-system-theme.sh` - Detects current macOS system theme (for reference)
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- `nixos/fish.nix` - Contains the `theme` fish alias
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- `nixos/home/danny/home.nix` - Contains the conditional Alacritty configuration
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- `bashscripts/wsl_theme.sh` - Legacy WSL script (replaced by theme.sh)
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- `assets/alacritty/catppuccin-latte-colors.toml` / `catppuccin-mocha-colors.toml` — palette fragments
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- `scripts/alacritty-sync-system-theme.sh` — detect macOS appearance, copy palette, refresh nvim marker
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- `scripts/sync-alacritty-theme.sh` — thin wrapper (backwards compatible)
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- `nixos/home/danny/home.nix` — `programs.alacritty` + `xdg.configFile` for palettes
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- `nixos/hosts/macos.nix` — LaunchAgent + `alacritty-sync-system-theme` in `environment.systemPackages`
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- `nixos/fish.nix` — optional shell-open sync on Darwin
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## Theme Colors
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After changing Nix config, run `darwin-rebuild switch` once (see repo `AGENTS.md`).
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## Theme colors
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### Catppuccin Latte (Light)
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- Background: `#eff1f5` (base)
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- Foreground: `#4c4f69` (text)
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- Accent colors optimized for light backgrounds
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### Catppuccin Mocha (Dark)
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- Background: `#1e1e2e` (base)
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- Foreground: `#cdd6f4` (text)
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- Accent colors optimized for dark backgrounds
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## Integration with NixOS
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The solution uses Nix's conditional configuration in `home.nix`:
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```nix
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colors = let
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isLightTheme = true; # Change this to switch themes
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lightColors = { /* Catppuccin Latte colors */ };
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darkColors = { /* Catppuccin Mocha colors */ };
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in if isLightTheme then lightColors else darkColors;
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```
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This approach:
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- ✅ Works with Spotlight/Applications folder launches
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- ✅ No complex file reading or external dependencies
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- ✅ Integrates cleanly with NixOS configuration
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- ✅ Simple and reliable - just change a boolean and rebuild
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- ✅ Easy to understand and maintain
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