feat: add nix flake

.envrc

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+use flake

.gitignore

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+.direnv/
+stream-sprout.yaml

devshell.nix

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+{ lib,
+  mkShell,
+  pkgs,
+  stdenv,
+}:
+mkShell {
+  packages = with pkgs; ([
+    ffmpeg-headless
+    procps
+    yq-go
+  ]);
+
+  shellHook = ''
+  '';
+}

flake.lock

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+{
+  "nodes": {
+    "flake-schemas": {
+      "locked": {
+        "lastModified": 1721078157,
+        "narHash": "sha256-c2AZH9cOnSpPXV8Lwy19/I8EgW7G+E+Zh6YQBZZwzxI=",
+        "rev": "29e53dd33b1a38f235ef073e768c62821cb6146e",
+        "revCount": 66,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/DeterminateSystems/flake-schemas/0.1.3/0190b841-54d3-7b7a-8550-24942bc38caf/source.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://flakehub.com/f/DeterminateSystems/flake-schemas/%2A.tar.gz"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1721548954,
+        "narHash": "sha256-7cCC8+Tdq1+3OPyc3+gVo9dzUNkNIQfwSDJ2HSi2u3o=",
+        "rev": "63d37ccd2d178d54e7fb691d7ec76000740ea24a",
+        "revCount": 633334,
+        "type": "tarball",
+        "url": "https://api.flakehub.com/f/pinned/NixOS/nixpkgs/0.2405.633334%2Brev-63d37ccd2d178d54e7fb691d7ec76000740ea24a/0190d847-0241-7628-8ab0-d49f442300f4/source.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://flakehub.com/f/NixOS/nixpkgs/%2A.tar.gz"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-schemas": "flake-schemas",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Stream Sprout flake";
+  inputs = {
+    flake-schemas.url = "https://flakehub.com/f/DeterminateSystems/flake-schemas/*.tar.gz";
+    nixpkgs.url = "https://flakehub.com/f/NixOS/nixpkgs/*.tar.gz";
+  };
+
+  outputs = {
+    self,
+    flake-schemas,
+    nixpkgs,
+  }: let
+      # Define supported systems and a helper function for generating system-specific outputs
+      supportedSystems = [ "x86_64-linux" "x86_64-darwin" "aarch64-darwin" "aarch64-linux" ];
+
+      forEachSupportedSystem = f: nixpkgs.lib.genAttrs supportedSystems (system: f {
+        system = system;
+        pkgs = import nixpkgs { inherit system; };
+      });
+  in {
+    # Define schemas for the flake's outputs
+    schemas = flake-schemas.schemas;
+
+    # Define overlays for each supported system
+    overlays = forEachSupportedSystem ({pkgs, system, ...}: {
+      default = final: prev: {
+        stream-sprout = final.callPackage ./package.nix { };
+      };
+    });
+
+    # Define packages for each supported system
+    packages = forEachSupportedSystem ({pkgs, system, ...}: rec {
+      stream-sprout = pkgs.callPackage ./package.nix { };
+      default = stream-sprout;
+    });
+
+    # Define devShells for each supported system
+    devShells = forEachSupportedSystem ({pkgs, system, ...}: {
+      default = pkgs.callPackage ./devshell.nix { };
+    });
+  };
+}

package.nix

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+{ lib
+, installShellFiles
+, makeWrapper
+, stdenv
+, ffmpeg-headless
+, procps
+, yq-go
+}:
+let
+  runtimePaths = [
+    ffmpeg-headless
+    procps
+    yq
+  ];
+  versionMatches =
+    builtins.match ''
+      .*
+      readonly[[:blank:]]VERSION="([[:digit:]]+\.[[:digit:]]+\.[[:digit:]]+)"
+      .*
+    '' (builtins.readFile ./stream-sprout);
+in
+stdenv.mkDerivation rec {
+  pname = "stream-sprout";
+  version = builtins.concatStringsSep "" versionMatches;
+  src = lib.cleanSource ./.;
+
+  nativeBuildInputs = [ makeWrapper installShellFiles ];
+
+  installPhase = ''
+    runHook preInstall
+    install -Dm755 -t "$out/bin" stream-sprout
+    runHook postInstall
+  '';
+
+  meta = {
+    description = "Re-stream a video source to multiple destinations such as Twitch, YouTube, and Owncast.";
+    homepage = "https://github.com/wimpys-world/stream-sprout";
+    mainProgram = "stream-sprout";
+    license = lib.licenses.asl20;
+    maintainers = with lib.maintainers; [ flexiondotorg ];
+  };
+}