# Unified Nix Configuration

This repository contains a modular, flake-based Nix configuration for multiple platforms and hosts. It provides a declarative and reproducible environment using NixOS, nix-darwin, and Home Manager.

## Quick Start Guide

### Daily Usage

```bash
# Apply changes (NixOS WSL)
nixos-rebuild switch --sudo --flake .#work --impure

# Apply changes (macOS)
darwin-rebuild switch --flake .#Martins-MacBook-Pro

# Update packages (weekly/monthly)
nix flake update
# ... then run the switch command for your host
```

## Structure

The configuration is organized into `hosts` and `modules`:

```
.
├── flake.nix               # Entry point with all system configurations
├── flake.lock              # Locked dependency versions
├── hosts/                  # Machine-specific configurations
│   ├── home/               
│   │   ├── darwin/         # Martins-MacBook-Pro
│   │   ├── nix/            # Standalone Home Manager for Home
│   │   └── nixos/          # Home NixOS Server
│   └── work/
│       ├── nix/            # Standalone Home Manager for Work
│       └── nixos/          # Work NixOS (WSL)
└── modules/                # Shared reusable modules
    ├── home/               # Home Manager modules (sh, nvim, tmux, etc.)
    └── nixos/              # NixOS-specific modules
```

## Available Configurations

### NixOS
- **work**: WSL-based NixOS environment for work (User: `pan`).
- **home**: Server-based NixOS environment for home (User: `martin`).

### Darwin (macOS)
- **Martins-MacBook-Pro**: nix-darwin configuration for macOS.

### Standalone Home Manager
- **pan@work**: Home Manager for non-NixOS Linux at work.
- **martin@mac**: Home Manager for macOS (without nix-darwin).

## Installation & Usage

### 1. Apply Configuration

Navigate to the repository and run the appropriate command for your system:

**NixOS (Work/WSL):**
```bash
sudo nixos-rebuild switch --flake .#work --impure
```

**Darwin (macOS):**
```bash
darwin-rebuild switch --flake .#Martins-MacBook-Pro
```

**Standalone Home Manager:**
```bash
home-manager switch --flake .#pan@work
```

*Note: The `--impure` flag may be required for certain configurations (like NIX_LD).*

### 2. Updating System Packages

To update all packages to the latest versions from nixpkgs-unstable:

```bash
# Update flake inputs
nix flake update

# Apply the updates
sudo nixos-rebuild switch --flake .#work --impure
```

## Maintenance

### Rollback
If something breaks after an update, you can rollback to the previous generation:
- **NixOS**: `sudo nixos-rebuild switch --rollback`
- **Darwin**: `darwin-rebuild --rollback`

### Cleanup
Remove old generations to free up disk space:
```bash
# Delete generations older than 30 days
sudo nix-collect-garbage --delete-older-than 30d

# Or delete all old generations
sudo nix-collect-garbage -d
```

## Modules Detail

### Home Manager Modules (`modules/home/`)
- **sh.nix**: Zsh configuration with completions and aliases.
- **nvim.nix**: Personalized Neovim setup.
- **tmux.nix**: Terminal multiplexer configuration.
- **git.nix**: Git, Lazygit, and Jujutsu settings.
- **dev.nix**: Development tools, language runtimes, and LLM tool configurations.
- **task.nix**: Taskwarrior and productivity tools.

### NixOS Modules (`modules/nixos/`)
- **common.nix**: Shared system settings for all NixOS hosts.

## Create Convenience Alias

Add these to your shell configuration for faster updates:

```bash
# Quick rebuild (adjust to your host)
alias nr='sudo nixos-rebuild switch --flake .#work --impure'

# Update and rebuild
alias nu='nix flake update && sudo nixos-rebuild switch --flake .#work --impure'
```