build: Add cargo2nix

.gitignore

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+/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 = "fdidx"
+version = "0.1.0"

Cargo.nix

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+# This file was @generated by cargo2nix 0.10.0.
+# It is not intended to be manually edited.
+
+args@{
+  release ? true,
+  rootFeatures ? [
+    "fdidx/default"
+  ],
+  rustPackages,
+  buildRustPackages,
+  hostPlatform,
+  hostPlatformCpu ? null,
+  hostPlatformFeatures ? [],
+  target ? null,
+  codegenOpts ? null,
+  profileOpts ? null,
+  mkRustCrate,
+  rustLib,
+  lib,
+  workspaceSrc,
+}:
+let
+  workspaceSrc = if args.workspaceSrc == null then ./. else args.workspaceSrc;
+in let
+  inherit (rustLib) fetchCratesIo fetchCrateLocal fetchCrateGit fetchCrateAlternativeRegistry expandFeatures decideProfile genDrvsByProfile;
+  profilesByName = {
+  };
+  rootFeatures' = expandFeatures rootFeatures;
+  overridableMkRustCrate = f:
+    let
+      drvs = genDrvsByProfile profilesByName ({ profile, profileName }: mkRustCrate ({ inherit release profile hostPlatformCpu hostPlatformFeatures target profileOpts codegenOpts; } // (f profileName)));
+    in { compileMode ? null, profileName ? decideProfile compileMode release }:
+      let drv = drvs.${profileName}; in if compileMode == null then drv else drv.override { inherit compileMode; };
+in
+{
+  cargo2nixVersion = "0.10.0";
+  workspace = {
+    fdidx = rustPackages.unknown.fdidx."0.1.0";
+  };
+  "unknown".fdidx."0.1.0" = overridableMkRustCrate (profileName: rec {
+    name = "fdidx";
+    version = "0.1.0";
+    registry = "unknown";
+    src = fetchCrateLocal workspaceSrc;
+  });
+  
+}

Cargo.toml

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+[package]
+name = "fdidx"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

flake.lock

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+{
+  "nodes": {
+    "cargo2nix": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "rust-overlay": [
+          "rust-overlay"
+        ]
+      },
+      "locked": {
+        "lastModified": 1638423893,
+        "narHash": "sha256-+NTV613zwK1G4UIKrj0gh1fYDvi85qO0wxy6h11azuY=",
+        "owner": "cargo2nix",
+        "repo": "cargo2nix",
+        "rev": "ae8a5e699f57b446f9507b97a3c97a4e9fe06aa3",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cargo2nix",
+        "ref": "master",
+        "repo": "cargo2nix",
+        "type": "github"
+      }
+    },
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1642700792,
+        "narHash": "sha256-XqHrk7hFb+zBvRg6Ghl+AZDq03ov6OshJLiSWOoX5es=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "846b2ae0fc4cc943637d3d1def4454213e203cba",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1643652773,
+        "narHash": "sha256-g16mlg5N6i80Cdu6gkuOhWmHX8ocpb2kCPpRmR+Qzx8=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "4b39f7108f1f066646754d54dbae46bcb836f11c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "cargo2nix": "cargo2nix",
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": [
+          "flake-utils"
+        ],
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1642838864,
+        "narHash": "sha256-pHnhm3HWwtvtOK7NdNHwERih3PgNlacrfeDwachIG8E=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "9fb49daf1bbe1d91e6c837706c481f9ebb3d8097",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = github:NixOS/nixpkgs;
+    cargo2nix.url = "github:cargo2nix/cargo2nix/master";
+    cargo2nix.inputs.nixpkgs.follows = "nixpkgs";
+    cargo2nix.inputs.flake-utils.follows = "flake-utils";
+    cargo2nix.inputs.rust-overlay.follows = "rust-overlay";
+    flake-utils.url = "github:numtide/flake-utils";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+    rust-overlay.inputs.nixpkgs.follows = "nixpkgs";
+    rust-overlay.inputs.flake-utils.follows = "flake-utils";
+  };
+  outputs = { self, nixpkgs, cargo2nix, flake-utils, rust-overlay, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [
+          cargo2nix.overlay.${system}
+          rust-overlay.overlay
+        ];
+        pkgs = import nixpkgs {
+          inherit system overlays;
+        };
+        rustPkgs = pkgs.rustBuilder.makePackageSet' {
+          packageFun = import ./Cargo.nix;
+          rustChannel = "1.58.1";
+          packageOverrides = pkgs: pkgs.rustBuilder.overrides.all;
+        };
+      in
+      rec {
+        devShell = rustPkgs.workspaceShell { };
+
+        packages = {
+          shell = devShell;
+        };
+      }
+    );
+}

src/main.rs

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