Basic Nix+Rust setup

.envrc

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+[ -e ".devenv" ] || rm -rf .devenv
+[ -L ".devenv" ] || (mkdir -p "$HOME/.cache/devenv$PWD"  && ln -s "$HOME/.cache/devenv$PWD" .devenv)
+
+if ! has nix_direnv_version || ! nix_direnv_version 2.2.1; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/2.2.1/direnvrc" "sha256-zelF0vLbEl5uaqrfIzbgNzJWGmLzCmYAkInj/LNxvKs="
+fi
+
+watch_file flake.nix
+watch_file flake.lock
+
+if ! use flake . --impure
+then
+  echo "devenv could not be built. The devenv environment was not loaded. Make the necessary changes to devenv.nix and hit enter to try again." >&2
+fi

.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/rust
+# Edit at https://www.toptal.com/developers/gitignore?templates=rust
+
+### Rust ###
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+# End of https://www.toptal.com/developers/gitignore/api/rust
+
+.devenv

Cargo.lock

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

Cargo.toml

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+[package]
+name = "work-timer"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

flake.lock

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+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1727826117,
+        "narHash": "sha256-K5ZLCyfO/Zj9mPFldf3iwS6oZStJcU4tSpiXTMYaaL0=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "3d04084d54bedc3d6b8b736c70ef449225c361b1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1730200266,
+        "narHash": "sha256-l253w0XMT8nWHGXuXqyiIC/bMvh1VRszGXgdpQlfhvU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "807e9154dcb16384b1b765ebe9cd2bba2ac287fd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+    description = "Generic Rust Flake";
+    inputs = {
+        nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+        flake-parts = {
+            url = "github:hercules-ci/flake-parts";
+            inputs.nixpkgs-lib.follows = "nixpkgs";
+        };
+    };
+
+    outputs = inputs @ {flake-parts, ...}:
+        flake-parts.lib.mkFlake {inherit inputs;} {
+            systems = ["x86_64-linux" "aarch64-linux"];
+            perSystem = {
+                pkgs,
+                ...
+            }: let
+            app = pkgs.rustPlatform.buildRustPackage {
+                pname = "work-timer";
+                version = "0.1.0";
+                cargoLock = {
+                    lockFile = ./Cargo.lock;
+                };
+                src = ./.;
+            };
+            in {
+                packages = {
+                    default = app;
+                    inherit app;
+                };
+            };
+        };
+}

src/main.rs

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