feat: add repl bin

flake.nix

@@ -18,17 +18,20 @@
   };
 
   nixConfig = {
+    extra-trusted-public-keys = "eigenvalue.cachix.org-1:ykerQDDa55PGxU25CETy9wF6uVDpadGGXYrFNJA3TUs=";
+    extra-substituters = "https://eigenvalue.cachix.org";
     allow-import-from-derivation = true;
   };
 
-  outputs =
-    inputs @ { self
-    , nixpkgs
-    , flake-parts
-    , rust-overlay
-    , crate2nix
-    , ...
-    }: flake-parts.lib.mkFlake { inherit inputs; } {
+  outputs = inputs @ {
+    self,
+    nixpkgs,
+    flake-parts,
+    rust-overlay,
+    crate2nix,
+    ...
+  }:
+    flake-parts.lib.mkFlake {inherit inputs;} {
       systems = [
         "x86_64-linux"
         "aarch64-linux"
@@ -41,37 +44,49 @@
         ./nix/devshell/flake-module.nix
       ];
 
-      perSystem = { system, pkgs, lib, inputs', ... }:
-        let
-          # If you dislike IFD, you can also generate it with `crate2nix generate` 
-          # on each dependency change and import it here with `import ./Cargo.nix`.
-          cargoNix = inputs.crate2nix.tools.${system}.appliedCargoNix {
-            name = "rustnix";
-            src = ./.;
-          };
-        in
-        rec {
-          checks = {
-            rustnix = cargoNix.rootCrate.build.override {
-              runTests = true;
-            };
-          };
-
-          packages = rec {
-            rustnix = cargoNix.rootCrate.build;
-            default = packages.rustnix;
-            dockerImage = pkgs.dockerTools.buildImage {
-              name = "lispers";
-              config = { Cmd = [ "${rustnix}/bin/lispers" ]; };
-            };
-
-            inherit (pkgs) rust-toolchain;
-
-            rust-toolchain-versions = pkgs.writeScriptBin "rust-toolchain-versions" ''
-              ${pkgs.rust-toolchain}/bin/cargo --version
-              ${pkgs.rust-toolchain}/bin/rustc --version
-            '';
+      perSystem = {
+        system,
+        pkgs,
+        lib,
+        inputs',
+        ...
+      }: let
+        # If you dislike IFD, you can also generate it with `crate2nix generate`
+        # on each dependency change and import it here with `import ./Cargo.nix`.
+        cargoNix = inputs.crate2nix.tools.${system}.appliedCargoNix {
+          name = "rustnix";
+          src = ./.;
+        };
+      in rec {
+        checks = {
+          rustnix = cargoNix.rootCrate.build.override {
+            runTests = true;
           };
         };
+
+        apps = rec {
+          demo = {
+            type = "app";
+            program = "${packages.default}/bin/demo";
+          };
+          repl = {
+            type = "app";
+            program = "${packages.default}/bin/repl";
+          };
+          default = demo;
+        };
+
+        packages = {
+          rustnix = cargoNix.rootCrate.build;
+          default = packages.rustnix;
+
+          inherit (pkgs) rust-toolchain;
+
+          rust-toolchain-versions = pkgs.writeScriptBin "rust-toolchain-versions" ''
+            ${pkgs.rust-toolchain}/bin/cargo --version
+            ${pkgs.rust-toolchain}/bin/rustc --version
+          '';
+        };
+      };
     };
 }