Basic scaffolding

.envrc

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+use flake

.gitignore

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+.direnv/
+result
+target/
+# Gets generated by Nix
+.pre-commit-config.yaml

.gitlab-ci.yml

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+stages:
+  - check
+  - build
+
+check:
+  stage: check
+  tags:
+    - nix
+  script:
+    - nix flake check -L

Cargo.lock

@@ -0,0 +1,7 @@
+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 4
+
+[[package]]
+name = "sword-rs"
+version = "0.1.0"

Cargo.toml

@@ -0,0 +1,6 @@
+[package]
+name = "sword-rs"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

flake.lock

@@ -0,0 +1,179 @@
+{
+  "nodes": {
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1696426674,
+        "narHash": "sha256-kvjfFW7WAETZlt09AgDn1MrtKzP7t90Vf7vypd3OL1U=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "0f9255e01c2351cc7d116c072cb317785dd33b33",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "locked": {
+        "lastModified": 1738453229,
+        "narHash": "sha256-7H9XgNiGLKN1G1CgRh0vUL4AheZSYzPm+zmZ7vxbJdo=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "32ea77a06711b758da0ad9bd6a844c5740a87abd",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "flake-root": {
+      "locked": {
+        "lastModified": 1723604017,
+        "narHash": "sha256-rBtQ8gg+Dn4Sx/s+pvjdq3CB2wQNzx9XGFq/JVGCB6k=",
+        "owner": "srid",
+        "repo": "flake-root",
+        "rev": "b759a56851e10cb13f6b8e5698af7b59c44be26e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "srid",
+        "repo": "flake-root",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "hooks",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1709087332,
+        "narHash": "sha256-HG2cCnktfHsKV0s4XW83gU3F57gaTljL9KNSuG6bnQs=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "637db329424fd7e46cf4185293b9cc8c88c95394",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
+    "hooks": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "gitignore": "gitignore",
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1737465171,
+        "narHash": "sha256-R10v2hoJRLq8jcL4syVFag7nIGE7m13qO48wRIukWNg=",
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "rev": "9364dc02281ce2d37a1f55b6e51f7c0f65a75f17",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "git-hooks.nix",
+        "type": "github"
+      }
+    },
+    "naersk": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1739824009,
+        "narHash": "sha256-fcNrCMUWVLMG3gKC5M9CBqVOAnJtyRvGPxptQFl5mVg=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "e5130d37369bfa600144c2424270c96f0ef0e11d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1730768919,
+        "narHash": "sha256-8AKquNnnSaJRXZxc5YmF/WfmxiHX6MMZZasRP6RRQkE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "a04d33c0c3f1a59a2c1cb0c6e34cd24500e5a1dc",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "lastModified": 1738452942,
+        "narHash": "sha256-vJzFZGaCpnmo7I6i416HaBLpC+hvcURh/BQwROcGIp8=",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/072a6db25e947df2f31aab9eccd0ab75d5b2da11.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/072a6db25e947df2f31aab9eccd0ab75d5b2da11.tar.gz"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 0,
+        "narHash": "sha256-EO1ygNKZlsAC9avfcwHkKGMsmipUk1Uc0TbrEZpkn64=",
+        "path": "/nix/store/kdynjy1mbgkdg4p196v9gx6ljpf7q4nk-source",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs_3": {
+      "locked": {
+        "lastModified": 1740303746,
+        "narHash": "sha256-XcdiWLEhjJkMxDLKQJ0CCivmYYCvA5MDxu9pMybM5kM=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "2d068ae5c6516b2d04562de50a58c682540de9bf",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "flake-root": "flake-root",
+        "hooks": "hooks",
+        "naersk": "naersk",
+        "nixpkgs": "nixpkgs_3"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+# github.com/brianmcgee has lots of great ideas for going above and beyond for this
+{
+  description = "Greg's homepage";
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    flake-root.url = "github:srid/flake-root";
+    hooks.url = "github:cachix/git-hooks.nix";
+    naersk.url = "github:nix-community/naersk";
+  };
+
+  outputs =
+    { flake-parts, ... }@inputs:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      imports = [
+        inputs.flake-root.flakeModule
+      ];
+      flake = {
+        # Universal things
+        overlays.default = _final: _prev: { };
+      };
+      systems = [
+        "x86_64-linux"
+        "aarch64-linux"
+        "aarch64-darwin"
+      ];
+      perSystem =
+        { pkgs, self', ... }@inputs':
+        let
+          naersk-lib = pkgs.callPackage inputs.naersk { };
+        in
+        {
+          _module.args.pkgs = import inputs.nixpkgs {
+            inherit (inputs') system;
+            overlays = [ ];
+          };
+          devShells.default = pkgs.mkShell rec {
+            # These will just be available
+            packages = with pkgs; [
+              cargo
+              rustc
+              rustfmt
+              clippy
+              stdenv.cc
+              pre-commit
+            ];
+
+            buildInputs = self'.checks.pre-commit.enabledPackages;
+
+            RUST_SRC_PATH = pkgs.rustPlatform.rustLibSrc;
+
+            inherit (self'.checks.pre-commit) shellHook;
+            #  This is also used when building with iced
+            #  let
+            #    lib_path = builtins.foldl' (a: b: "${a}:${b}/lib") "${pkgs.vulkan-loader}/lib" packages;
+            #  in
+            #  ''
+            #    export LD_LIBRARY_PATH="${lib_path}"
+            #  ''
+          };
+
+          checks = {
+            pre-commit = inputs.hooks.lib.${inputs'.system}.run {
+              src = ./.;
+              excludes = [ ".*\\.txt" ];
+              hooks = {
+                check-added-large-files.enable = true;
+                check-case-conflicts.enable = true;
+                check-merge-conflicts.enable = true;
+                check-symlinks.enable = true;
+                deadnix.enable = true;
+                end-of-file-fixer.enable = true;
+                fix-byte-order-marker.enable = true;
+                mixed-line-endings.enable = true;
+                nixfmt-rfc-style.enable = true;
+                trim-trailing-whitespace.enable = true;
+                # Rust hooks
+                cargo-check.enable = true;
+                clippy.enable = true;
+                rustfmt.enable = true;
+              };
+            };
+          };
+
+          # This is not special, this is just flakes
+          packages = rec {
+            default = rustpkg;
+            rustpkg = naersk-lib.buildPackage ./.;
+          };
+        };
+    };
+}

src/lib.rs

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+pub fn add(left: u64, right: u64) -> u64 {
+    left + right
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn it_works() {
+        let result = add(2, 2);
+        assert_eq!(result, 4);
+    }
+}