nix_example.md: refactor

examples/nix_example.md

@@ -1,10 +1,13 @@
 # Guide to Nix for KoboldCpp
 
-- KoboldCpp is available on Nixpkgs and can be installed by adding just `koboldcpp` to your `environment.systemPackages` *(or it can also be placed in `home.packages`)*.
+- KoboldCpp is available on Nixpkgs and can be installed by adding just
+`koboldcpp` to your `environment.systemPackages` *(or it can also be placed
+in `home.packages`)*.
 
 ## KoboldCpp Nix - CUDA Support
 
-In order to enable NVIDIA CUDA support, you'll need to configure several settings:
+In order to enable NVIDIA CUDA support, you'll need to configure several
+settings:
 
 - Enable required options:
 
@@ -13,20 +16,10 @@ nixpkgs.config.allowUnfree = true;    # Allow proprietary software
 nixpkgs.config.cudaSupport = true;    # Enable CUDA functionality
 ```
 
-- Enable graphics support based on your NixOS version:
-
-```nix
-# For NixOS 24.05:
-hardware.opengl.enable = true;
-
-# For NixOS 24.11 or unstable:
-hardware.graphics.enable = true;
-```
-
 - Set your GPU architecture:
 
 ```nix
-nixpkgs.config.cudaArches = [ "sm_75" ];  # Example for RTX 2080
+nixpkgs.config.cudaCapabilities = [ "sm_75" ];  # Example for RTX 2080
 ```
 
 To find your GPU's architecture code:
@@ -37,7 +30,7 @@ To find your GPU's architecture code:
 
 ## Hardware Support
 
-- ✅ Vulkan: Enabled by default on Linux and macOS
+- ✅ Vulkan: Enabled by default on Linux
 - ✅ Metal: Enabled by default on macOS
 - ❌ ROCm: Not currently available
 
@@ -47,24 +40,31 @@ To find your GPU's architecture code:
 nixpkgs.config = {
   allowUnfree = true;
   cudaSupport = true;
-  cudaArches = [ "sm_75" ];
+  cudaCapabilities = [ "sm_75" ];
 };
-# NixOS 24.05
-hardware.opengl.enable = true;
-# NixOS 24.11 or unstable
-# hardware.graphics.enable = true;
 environment.systemPackages = [ pkgs.koboldcpp ];
 # If you're using home-manager to install KoboldCpp
 # home.packages = [ pkgs.koboldcpp ];
+
+# You can also just override koboldcpp to add your CUDA architecture:
+# environment.systemPackages = [ (koboldcpp.override { cudaArches = ["sm_75"]; }) ]
+# or
+# home.packages = [ (koboldcpp.override { cudaArches = ["sm_75"]; }) ];
 ```
 
 ## KoboldCpp - Home Manager
 
-The setup for Home Manager is the same as regular Nix, with one exception regarding Home Manager's instance of nixpkgs. By default, Home Manager manages its own isolated instance of nixpkgs, which has two implications:
+The setup for Home Manager is the same as regular Nix, with one exception
+regarding Home Manager's instance of nixpkgs. By default, Home Manager manages
+its own isolated instance of nixpkgs, which has two implications:
 
-1. You can keep your private Home Manager nixpkgs instance and simply repeat your `nixpkgs.config` in home manager.
-2. You can set `home-manager.useGlobalPkgs = true;` to copy your module system's nixpkgs instance. This way, you only need to define it in your `configuration.nix`, and Home Manager will "inherit" this configuration.
+1. You can keep your private Home Manager nixpkgs instance and simply repeat
+your `nixpkgs.config` in home manager.
+2. You can set `home-manager.useGlobalPkgs = true;` to copy your module
+system's nixpkgs instance. This way, you only need to define it in your
+`configuration.nix`, and Home Manager will "inherit" this configuration.
 
 ## Getting Help for KoboldCpp Nix
 
-- If you face any issues with running KoboldCpp on Nix, please open an issue [here](https://github.com/NixOS/nixpkgs/issues/new?assignees=&labels=0.kind%3A+bug&projects=&template=bug_report.md&title=)
+- If you face any issues with running KoboldCpp on Nix, please open an issue
+[here](https://github.com/NixOS/nixpkgs/issues/new?assignees=&labels=0.kind%3A+bug&projects=&template=bug_report.md&title=)