feat: init

.envrc

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+use flake

.gitignore

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+### direnv ###
+.direnv
+
+### 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
+
+
+# Added by cargo
+
+/target

Cargo.toml

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+[package]
+name = "complete-rss"
+version = "0.1.0"
+edition = "2024"
+
+[dependencies]

flake.lock

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+{
+  "nodes": {
+    "flake-parts": {
+      "inputs": {
+        "nixpkgs-lib": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1754487366,
+        "narHash": "sha256-pHYj8gUBapuUzKV/kN/tR3Zvqc7o6gdFB9XKXIp1SQ8=",
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "rev": "af66ad14b28a127c5c0f3bbb298218fc63528a18",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "flake-parts",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1756266583,
+        "narHash": "sha256-cr748nSmpfvnhqSXPiCfUPxRz2FJnvf/RjJGvFfaCsM=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "8a6d5427d99ec71c64f0b93d45778c889005d9c2",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-parts": "flake-parts",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1756348497,
+        "narHash": "sha256-xJp3VnoYh4kpsaKFO/7SsGbwOz7pI1ZmjbqpXEuR2cw=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "0adf92c70d23fb4f703aea5d3ebb51ac65994f7f",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

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+{
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";
+    rust-overlay = {
+      url = "github:oxalica/rust-overlay";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+    # wild = {
+    #   url = "github:davidlattimore/wild";
+    #   inputs.nixpkgs.follows = "nixpkgs";
+    # };
+  };
+
+  outputs = inputs:
+    inputs.flake-parts.lib.mkFlake {inherit inputs;} {
+      systems = ["x86_64-linux"];
+      perSystem = {
+        self',
+        pkgs,
+        system,
+        ...
+      }: let
+        runtimeDeps = with pkgs; [];
+        buildDeps = with pkgs; [pkg-config rustPlatform.bindgenHook];
+        devDeps = with pkgs; [];
+
+        cargoToml = builtins.fromTOML (builtins.readFile ./Cargo.toml);
+        msrv = cargoToml.package.rust-version;
+
+        rustPackage = features:
+          (pkgs.makeRustPlatform {
+            cargo = pkgs.rust-bin.stable.latest.minimal;
+            rustc = pkgs.rust-bin.stable.latest.minimal;
+          }).buildRustPackage {
+            inherit (cargoToml.package) name version;
+            src = ./.;
+            cargoLock.lockFile = ./Cargo.lock;
+            buildFeatures = features;
+            buildInputs = runtimeDeps;
+            nativeBuildInputs = buildDeps;
+            # Uncomment if your cargo tests require networking or otherwise
+            # don't play nicely with the Nix build sandbox:
+            # doCheck = false;
+          };
+
+        mkDevShell = rustc:
+          pkgs.mkShell.override {
+            stdenv = pkgs.stdenvAdapters.useMoldLinker pkgs.stdenv;
+            # stdenv = pkgs.useWildLinker pkgs.stdenv;
+          } {
+            shellHook = ''
+              export RUST_SRC_PATH=${pkgs.rustPlatform.rustLibSrc}
+            '';
+            buildInputs = runtimeDeps;
+            nativeBuildInputs = buildDeps ++ devDeps ++ [rustc];
+          };
+      in {
+        _module.args.pkgs = import inputs.nixpkgs {
+          inherit system;
+          overlays = [
+            (import inputs.rust-overlay)
+            # inputs.wild.overlays.default
+          ];
+        };
+
+        packages.default = self'.packages.example;
+        devShells.default = self'.devShells.nightly;
+
+        packages.example = rustPackage "";
+
+        devShells.nightly = let
+          nightly = (pkgs.rust-bin.selectLatestNightlyWith
+            (toolchain: toolchain.default)).override {
+            extensions = ["rustc-codegen-cranelift-preview"];
+          };
+          devShell = mkDevShell nightly;
+        in
+          devShell.overrideAttrs (old: {
+            shellHook =
+              old.shellHook or ""
+              + ''
+                export RUSTFLAGS="-Zcodegen-backend=cranelift"
+              '';
+          });
+        devShells.stable = mkDevShell pkgs.rust-bin.stable.latest.default;
+        devShells.msrv = mkDevShell pkgs.rust-bin.stable.${msrv}.default;
+      };
+    };
+}

src/main.rs

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