feat: add rust template

flake.nix

@@ -204,8 +204,13 @@
 
         templates = {
           python = {
+            description = "Simple poetry shell.nix";
             path = ./templates/python;
           };
+          rust = {
+            description = "Crane + Fenix flake with mold for faster local builds.";
+            path = ./templates/rust;
+          };
         };
       };
     };

templates/rust/.cargo/config.toml

@@ -0,0 +1,2 @@
+[target.x86_64-unknown-linux-gnu]
+linker = "clang"

templates/rust/.envrc

@@ -0,0 +1 @@
+use flake

templates/rust/.gitignore

@@ -0,0 +1,24 @@
+# Created by https://www.toptal.com/developers/gitignore/api/rust,direnv
+# Edit at https://www.toptal.com/developers/gitignore?templates=rust,direnv
+
+### direnv ###
+.direnv
+.envrc
+
+### Rust ###
+# Generated by Cargo
+# will have compiled files and executables
+debug/
+target/
+
+# Remove Cargo.lock from gitignore if creating an executable, leave it for libraries
+# More information here https://doc.rust-lang.org/cargo/guide/cargo-toml-vs-cargo-lock.html
+# Cargo.lock
+
+# These are backup files generated by rustfmt
+**/*.rs.bk
+
+# MSVC Windows builds of rustc generate these, which store debugging information
+*.pdb
+
+# End of https://www.toptal.com/developers/gitignore/api/rust,direnv

templates/rust/flake.nix

@@ -0,0 +1,50 @@
+{
+  inputs = {
+    crane = {
+      url = "github:ipetkov/crane";
+      inputs = {
+        flake-utils.follows = "flake-utils";
+        nixpkgs.follows = "nixpkgs";
+      };
+    };
+    fenix = {
+      url = "github:nix-community/fenix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    flake-utils.url = "github:numtide/flake-utils";
+    nixpkgs.url = "nixpkgs/nixos-unstable";
+  };
+
+  outputs = { self, crane, fenix, flake-utils, nixpkgs }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        pkgs = (import nixpkgs) {
+          inherit system;
+        };
+        toolchain = fenix.packages.${system}.stable;
+        craneLib = crane.lib.${system}.overrideToolchain toolchain.toolchain;
+      in
+      {
+        packages.default =
+          let
+            inherit (pkgs.lib) fileset;
+          in
+          craneLib.buildPackage {
+            src = fileset.toSource {
+              root = ./.;
+              fileset = fileset.intersection
+                (fileset.difference ./.
+                  (fileset.unions [ ./.cargo ./flake.nix ./flake.lock ./.envrc ]))
+                (fileset.gitTracked ./.);
+            };
+          };
+
+        devShell = pkgs.mkShell.override
+          {
+            stdenv = pkgs.stdenvAdapters.useMoldLinker pkgs.clangStdenv;
+          }
+          {
+            nativeBuildInputs = with toolchain; [ rustc cargo rust-analyzer clippy ];
+          };
+      });
+}