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# CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
## Project Overview
NixOS flake configuration for multiple machines (kronos laptop, herra desktop) using NixOS 25.11 and Home Manager 25.11. Features a layered architecture with swappable desktop rices.
## Common Commands
```bash
# Apply configuration
sudo nixos-rebuild switch
# Test without applying
sudo nixos-rebuild test
# Validate flake syntax
nix flake check
# Preview changes
sudo nixos-rebuild dry-run
```
## Architecture
```
flake.nix # Entry point
↓
hosts/{kronos,herra}/ # Per-machine (hostname + hardware)
↓
system/ # System-wide config
├─ boot, audio, bluetooth, networking, graphics
├─ packages, programs, services, users, nix
├─ desktop.nix # X11 + i3wm
└─ stylix.nix # Theming
↓
home/mun/ # User config
├─ programs/ # git, ssh, zsh
└─ (imports active rice)
↓
home/rices/{nord-blue,original}/ # Desktop themes
```
## Key Files
- `flake.nix` - Defines inputs (nixpkgs, home-manager, stylix, fenix)
- `hosts/kronos/configuration.nix` - Laptop config
- `hosts/herra/configuration.nix` - Desktop config (dual-boot)
- `system/default.nix` - System module orchestrator
- `system/packages.nix` - System-wide packages
- `home/mun/default.nix` - User orchestrator (imports active rice)
- `home/rices/nord-blue/variables.nix` - Active rice colors
## Adding Configurations
**New system package:** Add to `system/packages.nix`
**New system module:** Create in `system/`, add to `system/default.nix` imports
**New user program:** Create in `home/mun/programs/`, add to `home/mun/default.nix` imports
**New rice module:** Create in active rice directory, add to its `default.nix`
**New rice:** Create `home/rices/my-rice/` with `default.nix` and `variables.nix`
## Switching Rices
Edit `home/mun/default.nix` to change the rice import:
```nix
../rices/nord-blue # or ../rices/original
```
Then: `sudo nixos-rebuild switch`
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