add rust template

flake.nix

@@ -99,4 +99,10 @@
       extraSpecialArgs = {inherit inputs;};
     };
   };
+  templates = {
+    rust = {
+      path = ./templates/rust;
+      description = "A simple rust binary template";
+    };
+  };
 }

templates/rust/.envrc

@@ -0,0 +1,17 @@
+#!/usr/bin/env bash
+# ^ make editor happy
+
+#
+# Use https://direnv.net/ to automatically load the dev shell.
+#
+
+if ! has nix_direnv_version || ! nix_direnv_version 3.0.4; then
+  source_url "https://raw.githubusercontent.com/nix-community/nix-direnv/3.0.4/direnvrc" "sha256-DzlYZ33mWF/Gs8DDeyjr8mnVmQGx7ASYqA5WlxwvBG4="
+fi  
+
+watch_file nix/**
+watch_file -- **/*.nix
+# Adding files to git includes them in a flake
+# But it is also a bit much reloading.
+# watch_file .git/index .git/HEAD
+use flake . --show-trace

templates/rust/.gitignore

@@ -0,0 +1,3 @@
+.direnv/
+target/
+result/

templates/rust/Cargo.toml

@@ -0,0 +1,11 @@
+[package]
+name = "RustBinary"
+description = "A rust binary"
+publish = false
+version = "0.1.0"
+
+edition = "2021"
+
+[[bin]]
+name = "hello"
+path = "src/main.rs"

templates/rust/flake.nix

@@ -0,0 +1,60 @@
+{
+  description = "Rust-Nix";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/unstable";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    flake-utils.url = "github:numtide/flake-utils";
+    crate2nix = {
+      url = "github:nix-community/crate2nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+  };
+
+  outputs = inputs @ {
+    crate2nix,
+    flake-utils,
+    nixpkgs,
+    rust-overlay,
+    ...
+  }:
+    flake-utils.lib.eachDefaultSystem (
+      system: let
+        # Overlay pkgs with rust-bin
+        overlays = [(import rust-overlay)];
+        pkgs = import nixpkgs {
+          inherit system overlays;
+        };
+
+        # Use rust-bin to generate the toolchain from rust-toolchain.toml
+        rust-toolchain = pkgs.rust-bin.fromRustupToolchainFile ./rust-toolchain.toml;
+
+        buildRustCrateForPkgs = pkgs:
+          pkgs.buildRustCrate.override {
+            rustc = rust-toolchain; # Use rustc from toolchain
+            cargo = rust-toolchain; # Use cargo from toolchain
+          };
+
+        # Cargo.nix for IFD
+        generatedCargoNix = crate2nix.tools.${system}.generatedCargoNix {
+          name = "rustnix";
+          src = ./.;
+        };
+
+        cargoNix = import generatedCargoNix {
+          inherit pkgs buildRustCrateForPkgs;
+        };
+      in {
+        packages = rec {
+          hello = cargoNix.rootCrate.build;
+          default = hello;
+        };
+        devShell = pkgs.mkShell {
+          buildInputs = [rust-toolchain];
+        };
+      }
+    );
+}

templates/rust/rust-toolchain.toml

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "1.80.1"
+components = [ "rustfmt", "rustc-dev", "rust-analyzer", "rust-src"]

templates/rust/src/main.rs

@@ -0,0 +1,11 @@
+use colored::*;
+
+fn main() {
+    println!("{}", "Hello, world!".red());
+    println!("{}", "Hello, world!".green());
+    println!("{}", "Hello, world!".yellow());
+    println!("{}", "Hello, world!".blue());
+    println!("{}", "Hello, world!".purple());
+    println!("{}", "Hello, world!".cyan());
+    println!("{}", "Hello, world!".white());
+}