build: add nix

.gitignore

@@ -8,3 +8,4 @@
 # Added by cargo
 
 /target
+/.direnv

flake.nix

@@ -1,5 +1,11 @@
 {
   inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixpkgs-23.05";
+    rust-overlay = {
+          url = "github:oxalica/rust-overlay";
+          inputs.nixpkgs.follows = "nixpkgs";
+          inputs.flake-utils.follows = "flake-utils";
+    };
     cargo2nix.url = "github:cargo2nix/cargo2nix/release-0.11.0";
     flake-utils.follows = "cargo2nix/flake-utils";
     nixpkgs.follows = "cargo2nix/nixpkgs";
@@ -18,11 +24,27 @@
           packageFun = import ./Cargo.nix;
         };
 
+        # The workspace defines a development shell with all of the dependencies
+        # and environment settings necessary for a regular `cargo build`
+        workspaceShell = rustPkgs.workspaceShell {
+          # This adds cargo2nix to the project shell via the cargo2nix flake
+          packages = [ cargo2nix.packages."${system}".cargo2nix ];
+        };
+
       in rec {
+        # this is the output (recursive) set (expressed for each system)
+
+        devShells = {
+          default = workspaceShell; # nix develop
+        };
+
+        # the packages in `nix build .#packages.<system>.<name>`
         packages = {
-          # replace hello-world with your package name
-          dsp-meta-cmd = (rustPkgs.workspace.dsp-meta-cmd {});
-          default = packages.hello-world;
+          # nix build .#dsp-meta-cmd
+          # nix build .#packages.x86_64-linux.dsp-meta-cmd
+          dsp-meta-cmd = (rustPkgs.workspace.dsp-meta-cmd {}).bin;
+          # nix build
+          default = packages.dsp-meta-cmd;
         };
       }
     );

result-bin

@@ -0,0 +1 @@
+/nix/store/wq3q06m18agdvj8q9lzf917mnkgsjd3z-crate-dsp-meta-cmd-0.1.3-bin