Basic project template.

.envrc

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+use flake

.gitignore

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+# direnv
+*.sw?
+.direnv
+.gopath
+/direnv
+/direnv.test
+/dist
+/test/config
+/test/data
+/test/scenarios/inherited/.envrc
+
+# Rust
+**/*.rs.bk
+*.pdb
+debug/
+target/
+# Creating an executable. Leave the lock here:
+# https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+Cargo.lock

Cargo.toml

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

flake.lock

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+{
+  "nodes": {
+    "flake-utils": {
+      "locked": {
+        "lastModified": 1638122382,
+        "narHash": "sha256-sQzZzAbvKEqN9s0bzWuYmRaA03v40gaJ4+iL1LXjaeI=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "74f7e4319258e287b0f9cb95426c9853b282730b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1640572776,
+        "narHash": "sha256-pWMTubBy1Ep31iuQ5lEKW2mjSHWEvcbvy9uHVch2764=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "d887ac7aee92e8fc54dde9060d60d927afae9d69",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-21.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  description = "Project for syncing various home-system configuration files.";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-21.11";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = nixpkgs.legacyPackages.${system};
+      in {
+        devShell = with pkgs; mkShell {
+          buildInputs = [
+            cargo
+            rustc
+          ] ++ lib.optionals stdenv.isDarwin [ libiconv ];
+        };
+      });
+}

src/main.rs

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