Add rust-toolchain template

rust-toolchain/.envrc

@@ -0,0 +1 @@
+use flake .

rust-toolchain/flake.lock

@@ -0,0 +1,93 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1659877975,
+        "narHash": "sha256-zllb8aq3YO3h8B/U0/J1WBgAL8EX5yWf5pMj3G0NAmc=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "c0e246b9b83f637f4681389ecabcb2681b4f3af0",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1665685160,
+        "narHash": "sha256-MkNROnBdE9ocwuVrK5J/AF7zGUv6g4UhfdZ6GTrNEJA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "849a740bc1342a18ce69bb08f82227202d1f7109",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1665296151,
+        "narHash": "sha256-uOB0oxqxN9K7XGF1hcnY+PQnlQJ+3bP2vCn/+Ru/bbc=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "14ccaaedd95a488dd7ae142757884d8e125b3363",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1665630024,
+        "narHash": "sha256-xXfneoHz4h4JR58leKFoHIIapAffWlOL9HI37vwuspo=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "73650741960a7422d1422f156f76211e576610c2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

rust-toolchain/flake.nix

@@ -0,0 +1,44 @@
+{
+  description = "A Nix-flake-based Rust development environment";
+
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs =
+    { self
+    , flake-utils
+    , nixpkgs
+    , rust-overlay
+    }:
+
+    flake-utils.lib.eachDefaultSystem (system:
+    let
+      overlays = [
+        (import rust-overlay)
+        (self: super: {
+          rustToolchain = super.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+        })
+      ];
+
+      pkgs = import nixpkgs { inherit system overlays; };
+    in
+    {
+      devShells.default = pkgs.mkShell {
+        nativeBuildInputs = with pkgs; [
+          rustToolchain
+          openssl
+          pkg-config
+          cargo-deny
+          cargo-edit
+          rust-analyzer
+        ] ++ pkgs.lib.optionals (pkgs.stdenv.isLinux) (with pkgs; [ cargo-watch ]); # Currently broken on macOS
+
+        shellHook = ''
+          ${pkgs.rustToolchain}/bin/cargo --version
+        '';
+      };
+    });
+}

rust-toolchain/rust-toolchain.toml

@@ -0,0 +1,2 @@
+[toolchain]
+channel = "1.64.0"