Basic package structure

.envrc

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+#!/usr/bin/env bash
+
+use flake

Cargo.toml

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+[workspace]
+members = [
+  "scheme",
+  "cli"
+]

cli/Cargo.toml

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+[package]
+name = "cli"
+version = "0.1.0"
+edition = "2021"
+
+
+[dependencies]
+scheme.path = "../scheme"
+cynic = { version = "3.2", features = ["http-surf"] }
+surf = "2"
+
+[build-dependencies]
+cynic-codegen = "3.2"

cli/src/main.rs

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

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1692799911,
+        "narHash": "sha256-3eihraek4qL744EvQXsK1Ha6C3CR7nnT8X2qWap4RNk=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "f9e7cf818399d17d347f847525c5a5a8032e4e44",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1693029596,
+        "narHash": "sha256-jFSmUmXjxBMNYAC+oC3ZfgeNveGd0cjPdu6SXvzSexE=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "203f0a1f3a41e67f2161aa50acff2a76f32a3f91",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    },
+    "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 = {
+    nixpkgs.url = "github:NixOS/nixpkgs";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = inputs@{ self, nixpkgs, flake-utils, ... }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let pkgs = import nixpkgs { inherit system; };
+      in {
+        packages.ggelo = pkgs.rustPlatform.buildRustPackage {
+          pname = "ggelo";
+          version = "0.1.0";
+          src = ./.;
+          cargoBuildFlags = "-p cli";
+          cargoLock.lockFile = ./Cargo.lock;
+        };
+
+        packages.default = self.packages.${system}.ggelo;
+
+        devShells.default = pkgs.mkShell {
+          inputsFrom = [ self.packages.${system}.ggelo ];
+          packages = [ pkgs.rust-analyzer ];
+        };
+    });
+}

scheme/Cargo.toml

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+[package]
+name = "scheme"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+cynic = "3.2"
+
+[build-dependencies]
+cynic-codegen = "3.2"

scheme/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);
+    }
+}