Get a basic Flake setup

.envrc

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+use flake

.gitignore

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+/target
+.direnv

Cargo.lock

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

Cargo.toml

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+[package]
+name = "rustdoku"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

flake.lock

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+{
+  "nodes": {
+    "devshell": {
+      "inputs": {
+        "nixpkgs": "nixpkgs"
+      },
+      "locked": {
+        "lastModified": 1728330715,
+        "narHash": "sha256-xRJ2nPOXb//u1jaBnDP56M7v5ldavjbtR6lfGqSvcKg=",
+        "owner": "numtide",
+        "repo": "devshell",
+        "rev": "dd6b80932022cea34a019e2bb32f6fa9e494dfef",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "devshell",
+        "type": "github"
+      }
+    },
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": "nixpkgs-lib"
+      },
+      "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"
+      }
+    },
+    "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"
+      }
+    },
+    "naersk": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1721727458,
+        "narHash": "sha256-r/xppY958gmZ4oTfLiHN0ZGuQ+RSTijDblVgVLFi1mw=",
+        "owner": "nix-community",
+        "repo": "naersk",
+        "rev": "3fb418eaf352498f6b6c30592e3beb63df42ef11",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "naersk",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1722073938,
+        "narHash": "sha256-OpX0StkL8vpXyWOGUD6G+MA26wAXK6SpT94kLJXo6B4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "e36e9f57337d0ff0cf77aceb58af4c805472bfae",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs-lib": {
+      "locked": {
+        "lastModified": 1727825735,
+        "narHash": "sha256-0xHYkMkeLVQAMa7gvkddbPqpxph+hDzdu1XdGPJR+Os=",
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/fb192fec7cc7a4c26d51779e9bab07ce6fa5597a.tar.gz"
+      },
+      "original": {
+        "type": "tarball",
+        "url": "https://github.com/NixOS/nixpkgs/archive/fb192fec7cc7a4c26d51779e9bab07ce6fa5597a.tar.gz"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 0,
+        "narHash": "sha256-HP89HZOT0ReIbI7IJZJQoJgxvB2Tn28V6XS3MNKnfLs=",
+        "path": "/nix/store/lryfc8mhk1czqsa421di2y5nzz5c3b8m-source",
+        "type": "path"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs_3": {
+      "locked": {
+        "lastModified": 1728538411,
+        "narHash": "sha256-f0SBJz1eZ2yOuKUr5CA9BHULGXVSn6miBuUWdTyhUhU=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "b69de56fac8c2b6f8fd27f2eca01dcda8e0a4221",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "devshell": "devshell",
+        "flake-parts": "flake-parts",
+        "flake-root": "flake-root",
+        "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";
+		devshell.url = "github:numtide/devshell";
+		flake-parts.url = "github:hercules-ci/flake-parts";
+		flake-root.url = "github:srid/flake-root";
+		naersk.url = "github:nix-community/naersk";
+		#process-compose.url = "github:Platonic-Systems/process-compose-flake";
+		#services-flake.url = "github:juspay/services-flake";
+	};
+
+	outputs = { flake-parts, ... }@inputs:
+	flake-parts.lib.mkFlake { inherit inputs; } {
+		imports = [
+			inputs.devshell.flakeModule
+			inputs.flake-root.flakeModule
+			#inputs.process-compose.flakeModule
+		];
+		flake = {
+			# Universal things
+			overlays.default = final: prev: {};
+		};
+		systems = [
+			"x86_64-linux"
+			"aarch64-linux"
+			"aarch64-darwin"
+		];
+		perSystem = { pkgs, ... }@inputs': let
+			naersk-lib = pkgs.callPackage inputs.naersk { };
+		in {
+			_module.args.pkgs = import inputs.nixpkgs {
+				inherit (inputs') system;
+				overlays = [];
+			};
+			# https://numtide.github.io/devshell/intro.html
+			devshells.default = {
+				env = [{
+					name = "RUST_SRC_PATH";
+					value = pkgs.rustPlatform.rustLibSrc;
+				}];
+				# These commands will be shown in the motd that users read
+				# upon entering the shell
+				commands = [{
+					package = pkgs.cargo;
+					category = "languages";
+					help = "The Cargo tool";
+				} {
+					package = pkgs.rustc;
+					category = "languages";
+					help = "The rust compiler";
+				} {
+					package = pkgs.rustfmt;
+					category = "tools";
+					help = "Formatting tool for Rust";
+				} {
+					package = pkgs.pre-commit;
+					category = "tools";
+					help = "Helps run certain checks";
+				} {
+					package = pkgs.rustPackages.clippy;
+					category = "tools";
+					help = "Standard Rust clippy tool";
+				} {
+					package = pkgs.stdenv.cc;
+					category = "languages";
+					help = "The C compiler, to help things out";
+				}];
+			};
+
+			# This is not special, this is just flakes
+			packages = {
+				default = naersk-lib.buildPackage ./.;
+			};
+		};
+	};
+}

src/lib.rs

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+#[derive(Clone,Debug,Copy)]
+pub enum CellValue {
+    One,
+    Two,
+    Three,
+    Four,
+    Five,
+    Six,
+    Seven,
+    Eight,
+    Nine
+}
+
+pub struct Cell {
+    value: Option<CellValue>,
+    candidates: Vec<CellValue>,
+
+}
+
+impl Default for Cell {
+    fn default() -> Cell {
+        Cell {
+            value : None,
+            candidates : vec![
+                CellValue::One,
+                CellValue::Two,
+                CellValue::Three,
+                CellValue::Four,
+                CellValue::Five,
+                CellValue::Six,
+                CellValue::Seven,
+                CellValue::Eight,
+                CellValue::Nine
+            ]
+        }
+    }
+}
+
+#[derive(Default)]
+pub struct Board {
+    cells: [ [ Cell ; 9 ] ; 9 ]
+}
+
+impl Board {
+    fn value(self, x: usize, y : usize) -> Option<CellValue> {
+        self.cells[x][y].value
+    }
+}
+
+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);
+    }
+}