feat(rust): initialised cargo

.envrc

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+use flake . --impure
+e

.gitignore

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+.direnv/
+**/*~
+
+# Added by cargo
+
+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "ralsay-rs"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "ralsay-rs"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

flake.lock

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+{
+  "nodes": {
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1722813957,
+        "narHash": "sha256-IAoYyYnED7P8zrBFMnmp7ydaJfwTnwcnqxUElC1I26Y=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "cb9a96f23c491c081b38eab96d22fa958043c9fa",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "ralsay in rust";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, nixpkgs }:
+  let
+    systems = [ "x86_64-linux" "aarch64-linux" ];
+    forEachSystems = nixpkgs.lib.genAttrs systems;
+    pkgsForEach = nixpkgs.legacyPackages;
+  in
+  {
+    packages = forEachSystems (system: {
+      default = pkgsForEach.${system}.callPackage ./nix/package.nix { };
+    });
+
+    devShells = forEachSystems (system: {
+      default = pkgsForEach.${system}.callPackage ./nix/shell.nix { };
+    });
+  };
+}

nix/package.nix

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+{
+  lib,
+  rustPlatform,
+  stdenvAdapters,
+  llvm,
+}: let
+  toml = (lib.importTOML ../Cargo.toml).package;
+  pname = toml.name;
+  inherit (toml) version;
+in
+  rustPlatform.buildRustPackage.override {stdenv = stdenvAdapters.useMoldLinker llvm.stdenv;} {
+    RUSTFLAGS = "-C link-arg=-fuse-ld=mold";
+
+    inherit pname version;
+
+    src = builtins.path {
+      name = "${pname}-${version}";
+      path = lib.sources.cleanSource ../.;
+    };
+
+    cargoLock.lockFile = ../Cargo.lock;
+  }

nix/shell.nix

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+{
+  mkShell,
+  rust-analyzer-unwrapped,
+  rustfmt,
+  clippy,
+  cargo,
+  rustc,
+  gcc,
+  rustPlatform,
+}:
+mkShell {
+  strictDeps = true;
+
+  nativeBuildInputs = [
+    cargo
+    rustc
+    gcc
+
+    rust-analyzer-unwrapped
+    rustfmt
+    clippy
+  ];
+
+  env.RUST_SRC_PATH = "${rustPlatform.rustLibSrc}";
+}

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}