smartcat: init at 1.3.0

Adds smartcat, a cat-like tool to interact with large language models on
the command line.
I've been looking for a minimal tool to easily work with a locally
running ollama instance, and this was a great fit so I figured I'd try my
hand at adding it to nixpkgs and maintaining it.

Co-authored-by: éclairevoyant <848000+eclairevoyant@users.noreply.github.com>

pkgs/by-name/sm/smartcat/package.nix

@@ -0,0 +1,48 @@
+{ lib
+, fetchFromGitHub
+, rustPlatform
+
+, darwin
+, libX11
+, openssl
+, pkg-config
+, stdenv
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "smartcat";
+  version = "1.3.0";
+
+  src = fetchFromGitHub {
+    owner = "efugier";
+    repo = "smartcat";
+    rev = "refs/tags/${version}";
+    hash = "sha256-iCtNNKXo0peGGUaQXKaaYaEo7MAL70PX0BAWPERNmlo=";
+  };
+
+  cargoHash = "sha256-qNl2bI5VqpMfoFc+gZC4XHrNT9pnWseduYSOi5Dzr9M=";
+
+  nativeBuildInputs = [
+    pkg-config
+  ];
+
+  buildInputs = [
+    openssl
+    libX11
+  ]
+  ++ lib.optionals stdenv.isDarwin [
+    darwin.apple_sdk.frameworks.AppKit
+    darwin.apple_sdk.frameworks.Security
+    darwin.apple_sdk.frameworks.SystemConfiguration
+  ];
+
+  meta = {
+    description = "Integrate large language models into the command line";
+    homepage = "https://github.com/efugier/smartcat";
+    changelog = "https://github.com/efugier/smartcat/releases/tag/v${version}";
+    license = lib.licenses.asl20;
+    platforms = lib.platforms.unix;
+    mainProgram = "sc";
+    maintainers = with lib.maintainers; [ lpchaim ];
+  };
+}