init

.envrc

@@ -0,0 +1 @@
+use nix

.gitattributes

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+flake.lock linguist-generated=true

.github/workflows/ci.yaml

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+name: CI
+
+on:
+  push:
+    branches: ["master"]
+  pull_request:
+    branches: ["develop"]
+
+  workflow_dispatch:
+
+jobs:
+  build:
+    steps:
+      - uses: actions/checkout@v3
+      - name: Install Nix
+        uses: DeterminateSystems/nix-installer-action@v4
+      - name: Run the Magic Nix Cache
+        uses: DeterminateSystems/magic-nix-cache-action@v2
+      - name: Build
+        run: |
+          nix build .#

.gitignore

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+/target
+/result-bin

Cargo.nix

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+# This file was @generated by cargo2nix 0.11.0.
+# It is not intended to be manually edited.
+
+args@{
+  release ? true,
+  rootFeatures ? [
+    "utils/default"
+    "cli/default"
+  ],
+  rustPackages,
+  buildRustPackages,
+  hostPlatform,
+  hostPlatformCpu ? null,
+  hostPlatformFeatures ? [],
+  target ? null,
+  codegenOpts ? null,
+  profileOpts ? null,
+  cargoUnstableFlags ? null,
+  rustcLinkFlags ? null,
+  rustcBuildFlags ? null,
+  mkRustCrate,
+  rustLib,
+  lib,
+  workspaceSrc,
+  ignoreLockHash,
+}:
+let
+  nixifiedLockHash = "e1174dd2490db7bebb5095bd9a33dae53aa22730bb5a9f6514c4cebc093fd14e";
+  workspaceSrc = if args.workspaceSrc == null then ./. else args.workspaceSrc;
+  currentLockHash = builtins.hashFile "sha256" (workspaceSrc + /Cargo.lock);
+  lockHashIgnored = if ignoreLockHash
+                  then builtins.trace "Ignoring lock hash" ignoreLockHash
+                  else ignoreLockHash;
+in if !lockHashIgnored && (nixifiedLockHash != currentLockHash) then
+  throw ("Cargo.nix ${nixifiedLockHash} is out of sync with Cargo.lock ${currentLockHash}")
+else let
+  inherit (rustLib) fetchCratesIo fetchCrateLocal fetchCrateGit fetchCrateAlternativeRegistry expandFeatures decideProfile genDrvsByProfile;
+  profilesByName = {
+  };
+  rootFeatures' = expandFeatures rootFeatures;
+  overridableMkRustCrate = f:
+    let
+      drvs = genDrvsByProfile profilesByName ({ profile, profileName }: mkRustCrate ({ inherit release profile hostPlatformCpu hostPlatformFeatures target profileOpts codegenOpts cargoUnstableFlags rustcLinkFlags rustcBuildFlags; } // (f profileName)));
+    in { compileMode ? null, profileName ? decideProfile compileMode release }:
+      let drv = drvs.${profileName}; in if compileMode == null then drv else drv.override { inherit compileMode; };
+in
+{
+  cargo2nixVersion = "0.11.0";
+  workspace = {
+    utils = rustPackages.unknown.utils."0.1.0";
+    cli = rustPackages.unknown.cli."0.1.0";
+  };
+  "unknown".cli."0.1.0" = overridableMkRustCrate (profileName: rec {
+    name = "cli";
+    version = "0.1.0";
+    registry = "unknown";
+    src = fetchCrateLocal workspaceSrc;
+    dependencies = {
+      utils = (rustPackages."unknown".utils."0.1.0" { inherit profileName; }).out;
+    };
+  });
+
+  "unknown".utils."0.1.0" = overridableMkRustCrate (profileName: rec {
+    name = "utils";
+    version = "0.1.0";
+    registry = "unknown";
+    src = fetchCrateLocal workspaceSrc;
+  });
+
+}

Cargo.toml

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+[workspace]
+members = [
+    "crates/utils",
+    "apps/cli",
+]

apps/cli/Cargo.toml

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

apps/cli/src/main.rs

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+use utils::add;
+
+fn main() {
+    println!("Hello, world! {}", add(1, 2));
+}

crates/utils/Cargo.toml

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

crates/utils/src/lib.rs

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