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# Nix flakes & Nix command
---
# Nix Command
* Nove nix cli
* Flake support
---
# Porovnani
```shell
nix-shell -p cowsay #Stare
nix shell nixpkgs#cowsay #Nove
nix run nixpkgs#cowsay #Nove
```

---
# Commandy
|Command|Na|
|---|---|
|flake new| Vytvoreni flaky z template
|develop| Build environment shell
|shell| temp shell s nejakym programem
|config check| Check configu na potencialni chyby
|run| Spusti output z flaky

---
# Flakes
## Proc?
* Lockfiles.
* Flake inputs
## Na co?
- Cokoliv.
---
# Jak pouzit flakes na system configuraci?
* Flake je jen cast zbytek je v normalnich nix filech
* Zbytek konfigurace bere inputy z flaky.
* Neprijdeme o nic jen mame lock file a moznost flake  jako inputu
---
# Flake example
```
{
  description = "NixOS configuration";
  inputs = {
    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
    home-manager.url = "github:nix-community/home-manager";
    home-manager.inputs.nixpkgs.follows = "nixpkgs";
    zen-browser.url = "github:0xc000022070/zen-browser-flake";
  };
  outputs = inputs @ {
    nixpkgs,
    home-manager,
    zen-browser,
    ...
  }: {
    nixosConfigurations = {
      laptop = nixpkgs.lib.nixosSystem {
        system = "x86_64-linux";
        modules = [
          ./laptop/configuration.nix
          home-manager.nixosModules.home-manager
          {
            home-manager.useGlobalPkgs = false;
            home-manager.useUserPackages = true;
            home-manager.extraSpecialArgs = {inherit zen-browser;};
            home-manager.users.albert = import ./modules/home.nix;
          }
        ];
      };
    };
  };
}
```
---
```
{
  zen-browser,
  config,
  pkgs,
  ...
}: {
  home.username = "nixFreak";
  home.homeDirectory = "/home/nixFreak";
  home.stateVersion = "24.05";
  home.packages = with pkgs;
    [
      cowsay
    ]
    ++ [
      zen-browser.packages."${system}".default
    ];
  programs.home-manager.enable = true;
}
```
---