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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 (full rebuild and activation)
sudo nixos-rebuild switch
# Test configuration without making it the default boot option
sudo nixos-rebuild test
# Validate flake syntax and check for errors
nix flake check
# Preview what changes would be made
sudo nixos-rebuild dry-run
# Update flake inputs to latest versions
nix flake update
# Update specific input (e.g., nixpkgs)
nix flake lock --update-input nixpkgs
# Build for specific host
sudo nixos-rebuild switch --flake .#kronos
sudo nixos-rebuild switch --flake .#herra
```
## 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, nixpkgs-unstable, home-manager, stylix, fenix, crane, nixowos) and outputs
- `hosts/kronos/configuration.nix` - Laptop-specific config (minimal: just hostname)
- `hosts/herra/configuration.nix` - Desktop config (dual-boot with Windows 11, uses GRUB OS prober)
- `system/default.nix` - System module orchestrator
- `system/packages.nix` - System-wide packages
- `home/mun/default.nix` - User orchestrator (imports active rice, user packages, programs)
- `home/rices/nord-blue/variables.nix` - Active rice color definitions
- `home/rices/nord-blue/default.nix` - Active rice module orchestrator
## Adding Configurations
**New system package:** Add to `system/packages.nix` under `environment.systemPackages`
**New user package:** Add to `home/mun/default.nix` under `home.packages` (supports fenix Rust toolchain, TeX Live combinations, RetroArch cores)
**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 (`home/rices/nord-blue/`), add to its `default.nix` imports
**New rice:** Create `home/rices/my-rice/` with `default.nix` (imports modules) and `variables.nix` (colors, wallpaper)
## Switching Rices
Edit `home/mun/default.nix` to change the rice import:
```nix
imports = [
./programs/zsh.nix
./programs/ssh.nix
./programs/git.nix
../rices/nord-blue # Current: alacritty, i3, nvim, helix, picom, fastfetch
# ../rices/original # Alternative: kitty, i3, polybar, rofi, dunst, neovim, nnn, picom
];
```
Then: `sudo nixos-rebuild switch`
## Important Architecture Details
**Overlays:** Flake provides `pkgs.unstable.*` for accessing bleeding-edge packages from nixpkgs-unstable while staying on stable 25.11
**NixOwOs Integration:** Enabled in `home/mun/default.nix` for NixOS branding/theming (os-release customization, overlays)
**Machine Separation:** Host configs are intentionally minimal (hostname + hardware). All shared system config lives in `system/`, all shared user config in `home/mun/`
**Rice Philosophy:** Rices are purely home-manager level. Desktop environment (X11 + i3wm base) is defined in `system/desktop.nix`, rices only configure appearance/theming
**Stylix:** System-level theming framework imported at flake level, configured in `system/stylix.nix`
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