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docs: update nix usage documenttion
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inputs.sdiff.url = "git+https://tangled.org/adriano.tngl.sh/sdiff";
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```
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Then add `inputs.sdiff.packages.${system}.default` to your packages, or use the provided overlay:
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Then add `inputs.sdiff.packages.${system}.default` to your packages, or use the provided overlay.
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**Direct package reference** (home-manager / NixOS `environment.systemPackages`):
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```nix
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home.packages = [ inputs.sdiff.packages.${pkgs.system}.default ];
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```
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**Overlay** — adds `pkgs.sdiff` to your package set:
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```nix
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nixpkgs.overlays = [ inputs.sdiff.overlays.default ];
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# Then reference it like any nixpkgs package:
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home.packages = [ pkgs.sdiff ];
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```
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In a NixOS or home-manager flake this typically looks like:
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```nix
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{
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inputs = {
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nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
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home-manager.url = "github:nix-community/home-manager";
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sdiff.url = "git+https://tangled.org/adriano.tngl.sh/sdiff";
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};
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outputs = { nixpkgs, home-manager, sdiff, ... }: {
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homeConfigurations.yourname = home-manager.lib.homeManagerConfiguration {
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pkgs = import nixpkgs {
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system = "x86_64-linux";
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overlays = [ sdiff.overlays.default ];
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};
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modules = [
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({ pkgs, ... }: { home.packages = [ pkgs.sdiff ]; })
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];
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};
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};
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}
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```
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## Usage
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