Add direnv support

rust/.envrc

@@ -0,0 +1,4 @@
+if ! has nix_direnv_version || ! nix_direnv_version 2.1.1; then
+    source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.1.1/direnvrc" "sha256-b6qJ4r34rbE23yWjMqbmu3ia2z4b2wIlZUksBke/ol0="
+fi
+use flake .

rust/.gitignore

@@ -0,0 +1,2 @@
+.direnv
+target

rust/Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "rust"
+version = "0.1.0"

rust/Cargo.toml

@@ -0,0 +1,8 @@
+[package]
+name = "rust"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

rust/flake.lock

@@ -0,0 +1,93 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1656928814,
+        "narHash": "sha256-RIFfgBuKz6Hp89yRr7+NR5tzIAbn52h8vT6vXkYjZoM=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "7e2a3b3dfd9af950a856d66b0a7d01e3c18aa249",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "locked": {
+        "lastModified": 1656065134,
+        "narHash": "sha256-oc6E6ByIw3oJaIyc67maaFcnjYOz1mMcOtHxbEf9NwQ=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "bee6a7250dd1b01844a2de7e02e4df7d8a0a206c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1657577542,
+        "narHash": "sha256-tJnYrGTswnCtz8hXR24y4sZ7d+kgZ7UshnFBcrDjFkU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "0a1978fbe48b8bd08be138507e9dade26e5778b8",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1656401090,
+        "narHash": "sha256-bUS2nfQsvTQW2z8SK7oEFSElbmoBahOPtbXPm0AL3I4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "16de63fcc54e88b9a106a603038dd5dd2feb21eb",
+        "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": 1657507721,
+        "narHash": "sha256-FtV5D35ikz7zvhBX66Bs3VKd/GDyIVA+WQzqkR1PS0E=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "1a133f54a0229af8310879eac2c4a82c0576a0b9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

rust/flake.nix

@@ -0,0 +1,48 @@
+{
+  description = "A Nix-flake-based Rust development environment";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, rust-overlay }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [
+          (import rust-overlay)
+        ];
+
+        pkgs = import nixpkgs {
+          inherit system overlays;
+        };
+
+        rust = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+
+        inherit (pkgs.lib) optionals;
+        inherit (pkgs.stdenv) isDarwin;
+      in {
+        packages.default = rust;
+
+        devShells = {
+          default = pkgs.mkShell {
+            nativeBuildInputs = [
+              rust
+              pkgs.pkg-config
+            ];
+
+            buildInputs = with pkgs; [
+              openssl
+              pkgconfig
+            ];
+
+            shellHook = ''
+              echo "Entering Rust env"
+              echo "Running `${rust}/bin/cargo --version`"
+            '';
+          };
+        };
+      }
+    );
+}

rust/rust-toolchain.toml

@@ -0,0 +1,2 @@
+[toolchain]
+channel = "1.61.0"

rust/src/main.rs

@@ -0,0 +1,3 @@
+fn main() {
+    println!("Hello, world!");
+}