nix: add flake + devShell, ignore result

.gitignore

@@ -5,3 +5,7 @@ nimcache/
 demo.png/
 diag.png/
 diag.tape
+
+# Nix
+result
+result-*

flake.lock

@@ -0,0 +1,27 @@
+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1776548001,
+        "narHash": "sha256-ZSK0NL4a1BwVbbTBoSnWgbJy9HeZFXLYQizjb2DPF24=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b12141ef619e0a9c1c84dc8c684040326f27cdcc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,116 @@
+{
+  description = "Terminal oscilloscope with CRT phosphor rendering";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs =
+    { self, nixpkgs }:
+    let
+      lib = nixpkgs.lib;
+
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+      ];
+
+      forAllSystems = lib.genAttrs systems;
+
+      mkPkgs = system:
+        import nixpkgs { inherit system; };
+    in
+    {
+      packages = forAllSystems (system:
+        let
+          pkgs = mkPkgs system;
+          ffmpegForOsc = pkgs.ffmpeg-full;
+          runtimeLibraryPath = lib.makeLibraryPath [ ffmpegForOsc ];
+        in
+        {
+          default = pkgs.stdenv.mkDerivation {
+            pname = "terminal-oscilloscope";
+            version = "0.1.0";
+
+            src = ./.;
+
+            nativeBuildInputs = [
+              pkgs.nim
+              pkgs.makeWrapper
+            ];
+
+            buildInputs = [
+              ffmpegForOsc
+            ];
+
+            buildPhase = ''
+              runHook preBuild
+
+              nim c -d:release --threads:on --nimcache:$TMPDIR/nimcache-osc_braille -o:osc_braille src/osc_braille.nim
+              nim c -d:release --threads:on --nimcache:$TMPDIR/nimcache-osc_braille -o:osc src/osc.nim
+
+              runHook postBuild
+            '';
+
+            installPhase = ''
+              runHook preInstall
+
+              install -Dm755 osc $out/bin/osc-unwrapped
+              install -Dm755 osc_braille $out/bin/osc_braille-unwrapped
+
+              makeWrapper $out/bin/osc-unwrapped $out/bin/osc \
+                --prefix LD_LIBRARY_PATH : ${runtimeLibraryPath}
+
+              makeWrapper $out/bin/osc_braille-unwrapped $out/bin/osc_braille \
+                --prefix LD_LIBRARY_PATH : ${runtimeLibraryPath}
+
+              runHook postInstall
+            '';
+
+            meta = {
+              description = "Terminal oscilloscope with CRT phosphor rendering";
+              mainProgram = "osc";
+              platforms = lib.platforms.linux;
+            };
+          };
+        });
+
+      apps = forAllSystems (system: {
+        default = {
+          type = "app";
+          program = "${self.packages.${system}.default}/bin/osc";
+        };
+
+        osc = {
+          type = "app";
+          program = "${self.packages.${system}.default}/bin/osc";
+        };
+
+        osc_braille = {
+          type = "app";
+          program = "${self.packages.${system}.default}/bin/osc_braille";
+        };
+      });
+
+      devShells = forAllSystems (system:
+        let
+          pkgs = mkPkgs system;
+          ffmpegForOsc = pkgs.ffmpeg-full;
+          runtimeLibraryPath = lib.makeLibraryPath [ ffmpegForOsc ];
+        in
+        {
+          default = pkgs.mkShell {
+            packages = [
+              pkgs.nim
+              pkgs.nimble
+              pkgs.pkg-config
+              ffmpegForOsc
+            ];
+
+            shellHook = ''
+              export LD_LIBRARY_PATH=${runtimeLibraryPath}:''${LD_LIBRARY_PATH:-}
+            '';
+          };
+        });
+    };
+}