Rearrange the config structure

README.md

@@ -29,6 +29,10 @@ home-manager switch --flake github:Logan-Lin/nix-config#yanlin
 ```
 .
 ├── flake.nix          # Main flake configuration and package definitions
+├── hosts/             # Host-specific configurations
+│   └── darwin/        # macOS hosts
+│       ├── iMac/      # iMac configuration
+│       └── MacBook-Air/ # MacBook Air configuration
 ├── modules/           # Home Manager configuration modules
 │   ├── git.nix        # Git configuration with aliases and settings
 │   ├── lazygit.nix    # Lazygit with gruvbox theme and custom keybindings
@@ -43,14 +47,24 @@ home-manager switch --flake github:Logan-Lin/nix-config#yanlin
 │   ├── btop.nix       # Modern system monitor
 │   ├── ghostty.nix    # GPU-accelerated terminal emulator
 │   ├── syncthing.nix  # File synchronization service
-│   └── tailscale.nix  # Secure networking and VPN service
-├── system/            # System-level nix-darwin configurations
-│   ├── default.nix    # System module imports
-│   └── macos-defaults.nix # macOS system preferences and customizations
+│   ├── tailscale.nix  # Secure networking and VPN service
+│   └── homebrew.nix   # Homebrew and nix-homebrew configuration
+├── system/            # System-level configurations
+│   ├── default.nix    # System module imports with platform detection
+│   └── darwin/        # macOS-specific system configurations
+│       └── defaults.nix # macOS system preferences and customizations
 ├── config/            # Configuration files
+│   ├── firefox/       # Firefox browser configuration
+│   │   ├── bookmarks.nix
+│   │   ├── extensions.nix
+│   │   └── search.nix
+│   ├── packages/      # Package configurations
+│   │   ├── common.nix # Common packages across platforms
+│   │   └── darwin.nix # macOS-specific packages
+│   ├── fonts.nix      # Font packages and configuration
 │   ├── p10k.zsh       # Powerlevel10k theme configuration
-│   ├── projects.nix   # Project shortcuts configuration
-│   └── fonts.nix      # Font packages and configuration
+│   ├── projects.json  # Project definitions
+│   └── projects.nix   # Project shortcuts configuration
 └── scripts/           # Utility scripts
     └── project-launcher.sh  # Dynamic project launcher with window configuration
 ```
@@ -117,7 +131,12 @@ hm                 # home-manager shortcut
 hms                # Quick home-manager switch (rebuild)
 
 # Directory navigation helpers
-cdf [pattern]      # Find file/directory and cd to its location
+cdf                # Interactive file/directory search with real-time preview
+                   # Type to search, Enter to cd to selection or parent
+
+# Application launcher
+app [file]         # Interactive macOS app selector with fzf
+                   # Optional: open file with selected app
 ```
 
 ### 🖥️ Session Management: Tmux
@@ -176,10 +195,11 @@ cdf [pattern]      # Find file/directory and cd to its location
 
 #### Usage:
 ```bash
-proj                  # List all available projects
-proj nix-config       # Launch nix-config project tmux session
-proj blog             # Launch blog project tmux session
-proj homelab          # Launch homelab project tmux session
+proj                  # Interactive project selector with fzf
+                      # Shows description, windows, and live tmux status
+                      # Preview includes running/not running status
+proj nix-config       # Direct launch (non-interactive mode)
+proj blog             # Direct launch (non-interactive mode)
 ```
 
 #### Window-Based Configuration:
@@ -355,6 +375,43 @@ sudo mdutil -a -i on
 sudo mdutil -E /
 ```
 
+## 📦 Package Management: Homebrew Integration
+
+**Configuration**: `modules/homebrew.nix`  
+**Purpose**: Declarative management of GUI applications via Homebrew on macOS
+
+### Key Features:
+- **Declarative Management**: GUI applications defined in nix configuration
+- **Automatic Updates**: Apps update with system rebuilds
+- **Cleanup on Rebuild**: Removes unlisted applications (zap mode)
+- **nix-homebrew Integration**: Homebrew itself managed by Nix
+
+### Managed Applications:
+- **Firefox**: Web browser
+- **Ghostty**: GPU-accelerated terminal emulator  
+- **Obsidian**: Note-taking and knowledge management
+- **Inkscape**: Vector graphics editor
+- **Snipaste**: Screenshot and annotation tool
+- **SlidePilot**: Presentation remote control
+- **Tencent Meeting**: Video conferencing
+- **Ovito**: Scientific visualization software
+- **WeChat**: Messaging and communication
+
+### Management Commands:
+```bash
+# All managed through darwin-rebuild
+sudo darwin-rebuild switch --flake .
+
+# Manual Homebrew operations (if needed)
+brew list              # List installed formulae and casks
+brew info <cask>      # Get info about a specific application
+```
+
+### Integration Details:
+- Applications install to `/Applications` automatically
+- Homebrew managed by nix-homebrew for reproducibility
+- Both Intel and Apple Silicon apps supported via Rosetta
+
 ## 🔐 SSH Configuration
 
 **Configuration**: `modules/ssh.nix`  
@@ -404,8 +461,10 @@ nvim $(fd --type f | fzf --preview 'bat --color=always {}')
 cd proj && nvim .        # Jump to project directory and edit
 zi && fd "*.md" | fzf    # Interactive directory select, then find markdown files
 
-# Find and navigate to directories containing specific files
-cdf "Universal Sparse"   # Search for files/dirs matching pattern and cd there
+# Interactive directory navigation with real-time search
+cdf                      # Type to search files/directories across your home
+                         # Shows preview of directories and file contents
+                         # Enter to cd to selection or its parent directory
 ```
 
 #### Built-in zsh keybindings:

flake.nix

@@ -19,9 +19,9 @@
 
   outputs = inputs@{ self, nix-darwin, nixpkgs, home-manager, nixvim, claude-code, firefox-addons, nix-homebrew }:
   let
-    configuration = { pkgs, ... }: {
+    # Common system configuration shared across all Darwin systems
+    commonSystemConfig = { pkgs, ... }: {
       imports = [
-        ./system
         ./modules/tailscale.nix
       ];
 
@@ -63,8 +63,8 @@
         ./modules/ghostty.nix
         ./modules/syncthing.nix
         ./config/fonts.nix
-        ./config/packages-common.nix
-        ./config/packages-macos.nix
+        ./config/packages/common.nix
+        ./config/packages/darwin.nix
       ];
 
       nixpkgs.config.allowUnfree = true;
@@ -81,14 +81,16 @@
   {
     darwinConfigurations."iMac" = nix-darwin.lib.darwinSystem {
       modules = [ 
-        configuration 
+        commonSystemConfig
+        ./hosts/darwin/iMac
         nix-homebrew.darwinModules.nix-homebrew
       ];
     };
 
     darwinConfigurations."MacBook-Air" = nix-darwin.lib.darwinSystem {
       modules = [ 
-        configuration 
+        commonSystemConfig
+        ./hosts/darwin/MacBook-Air
         nix-homebrew.darwinModules.nix-homebrew
       ];
     };

hosts/darwin/MacBook-Air/default.nix

@@ -0,0 +1,12 @@
+{ config, pkgs, ... }:
+
+{
+  # MacBook Air-specific configuration
+  networking.computerName = "MacBook-Air";
+  networking.hostName = "MacBook-Air";
+  
+  # Import common Darwin configuration
+  imports = [
+    ../../../system
+  ];
+}

hosts/darwin/iMac/default.nix

@@ -0,0 +1,12 @@
+{ config, pkgs, ... }:
+
+{
+  # iMac-specific configuration
+  networking.computerName = "iMac";
+  networking.hostName = "iMac";
+  
+  # Import common Darwin configuration
+  imports = [
+    ../../../system
+  ];
+}

modules/homebrew.nix

@@ -29,4 +29,12 @@
       # Additional repositories if needed
     ];
   };
+
+  # nix-homebrew configuration for declarative Homebrew installation
+  nix-homebrew = {
+    enable = true;
+    enableRosetta = true;  # Apple Silicon support
+    user = "yanlin";
+    autoMigrate = true;    # Migrate existing Homebrew if present
+  };
 }

modules/nix-homebrew.nix

@@ -1,11 +0,0 @@
-{ config, pkgs, ... }:
-
-{
-  # nix-homebrew configuration for declarative Homebrew installation
-  nix-homebrew = {
-    enable = true;
-    enableRosetta = true;  # Apple Silicon support
-    user = "yanlin";
-    autoMigrate = true;    # Migrate existing Homebrew if present
-  };
-}

system/darwin/defaults.nix

@@ -2,8 +2,7 @@
 
 {
   imports = [
-    ../modules/homebrew.nix
-    ../modules/nix-homebrew.nix
+    ../../modules/homebrew.nix
   ];
 
   # Set primary user for system preferences

system/default.nix

@@ -2,7 +2,7 @@
 
 {
   imports = [
-    ./macos-defaults.nix
+    ./darwin/defaults.nix
   ];
 
 }