feat: init

.envrc

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+use flake

.gitignore

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+### direnv ###
+.direnv
+
+### Rust ###
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+# Added by cargo
+/target

flake.lock

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+{
+  "nodes": {
+    "crane": {
+      "locked": {
+        "lastModified": 1736101677,
+        "narHash": "sha256-iKOPq86AOWCohuzxwFy/MtC8PcSVGnrxBOvxpjpzrAY=",
+        "owner": "ipetkov",
+        "repo": "crane",
+        "rev": "61ba163d85e5adeddc7b3a69bb174034965965b2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "ipetkov",
+        "repo": "crane",
+        "type": "github"
+      }
+    },
+    "fenix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-analyzer-src": "rust-analyzer-src"
+      },
+      "locked": {
+        "lastModified": 1736318091,
+        "narHash": "sha256-RkRHXZaMgOMGgkW2YmEqxxDDYRiGFbfr1JuaI0VrCKo=",
+        "owner": "nix-community",
+        "repo": "fenix",
+        "rev": "9e13860d50cbfd42e79101a516e1939c7723f093",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-community",
+        "repo": "fenix",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1731533236,
+        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1736344531,
+        "narHash": "sha256-8YVQ9ZbSfuUk2bUf2KRj60NRraLPKPS0Q4QFTbc+c2c=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "bffc22eb12172e6db3c5dde9e3e5628f8e3e7912",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "ref": "nixos-unstable",
+        "type": "indirect"
+      }
+    },
+    "root": {
+      "inputs": {
+        "crane": "crane",
+        "fenix": "fenix",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "rust-analyzer-src": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1736266405,
+        "narHash": "sha256-V2FDSb8YjuquZduBRNp5niWYlWurja2yGN6Xzh5GPYk=",
+        "owner": "rust-lang",
+        "repo": "rust-analyzer",
+        "rev": "91fc0a239af4e56b84b1d3974ac0f34dcc99b895",
+        "type": "github"
+      },
+      "original": {
+        "owner": "rust-lang",
+        "ref": "nightly",
+        "repo": "rust-analyzer",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs = {
+    crane.url = "github:ipetkov/crane";
+    fenix.url = "github:nix-community/fenix";
+    fenix.inputs.nixpkgs.follows = "nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, crane, flake-utils, nixpkgs, ... }@inputs:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        inherit (pkgs) lib;
+        pkgs = import nixpkgs { inherit system; };
+        fenix = inputs.fenix.packages.${system};
+        craneLib = crane.lib.${system}.overrideToolchain toolchain.toolchain;
+        mkSrc = extraPaths: with lib.fileset; let
+          root = ./.;
+          rustFiles = fromSource (craneLib.cleanCargoSource root);
+          fileset = union rustFiles (unions extraPaths);
+        in
+        toSource { inherit root fileset; };
+
+        ## Customize here ##
+        toolchain = fenix.stable; # or fenix.complete;
+        stdenv = pkgs.stdenvAdapters.useMoldLinker pkgs.stdenv;
+      in
+      {
+        packages.default = craneLib.buildPackage {
+          inherit stdenv;
+          src = mkSrc [ ];
+          strictDeps = true;
+          buildInputs = [
+            # Add additional build inputs here
+          ] ++ lib.optionals pkgs.stdenv.isDarwin [
+            # Additional darwin specific inputs can be set here
+            pkgs.libiconv
+          ];
+          # Additional environment variables can be set directly
+          # MY_CUSTOM_VAR = "some value";
+        };
+
+        devShells.default = pkgs.mkShell.override { inherit stdenv; }
+          {
+            nativeBuildInputs = with pkgs; [
+              # Add additional build inputs here
+            ] ++ (with toolchain; [
+              cargo
+              clippy
+              rustfmt
+              rustc
+              fenix.rust-analyzer
+            ]);
+            RUST_SRC_PATH = "${toolchain.rust-src}/lib/rustlib/src/rust/library";
+          };
+      }
+    );
+}