Feat: Add Nix support

[tbaumann]

Adding Nix support. Nixos modules may follow...

Run directly with nix run github:RightNow-AI/openfang

There are a bunch of flake outputs (based on cargo workspace) Focus on these:

• openfang-cli (default)
• openfang-desktop

[DaniyalMusadiq1]

can you explain how it works....

[tbaumann]

can you explain how it works....

It will make it really easy to use openfang on Nixos systems. Literally the nix command above to launch the latest version in main.
Not even any installation necessary. (Most people would probably include the nix packet closure in their system definition though)

The package build will only be the start. I shall, when I have time for it, make a nixosModule so Nixos users can define a deterministic config. (Or maybe also home-manager module)

You are probably not familiar with Nixos. But it's really quite awesome and useful. 😄

Example
flake.nix

inputs.openfang.url = "github:tbaumann/openfang";

in system configuration.nix

# Now just package installation
  environment.systemPackages = with pkgs; [ inputs.openfang.packages.${pkgs.stdenv.hostPlatform.system}.default ];

# In the future once I implemented it, declarative configuration
services.openfang = {
  enable = true;
   settings = {
     network_enabled = false; 
     default_model = {
        provider = "anthropic";
        model = "claude-sonnet-4-20250514";
        api_key_env = "ANTHROPIC_API_KEY";
     };
   };
 };

[DaniyalMusadiq1]

understood