Add Nix flake and direnv files.

.envrc

@@ -0,0 +1,3 @@
+#!/usr/bin/env bash
+
+use flake

.gitignore

@@ -1,7 +1,5 @@
-# Generated by Cargo
-Cargo.lock
+.direnv/
+coverage/
 debug/
 target/
-
-# Code coverage results
-coverage/
+Cargo.lock

Makefile.toml

@@ -1,33 +1,21 @@
-[tasks.fmt]
-command = "cargo"
-args = ["fmt", "${@}"]
-
-[tasks.check]
-command = "cargo"
-args = ["check", "${@}"]
-
-[tasks.clippy]
-command = "cargo"
-args = ["clippy", "${@}"]
-
-[tasks.test]
-command = "cargo"
-args = ["test", "${@}"]
-
-[tasks.doc]
-command = "cargo"
-args = ["doc", "${@}"]
-
-[tasks.build]
-command = "cargo"
-args = ["build", "${@}"]
-
+# Do a full check of everything.
 [tasks.complete-check]
-dependencies = ["fmt", "check", "clippy", "test", "doc", "build"]
+dependencies = [
+  "format",
+  "spellcheck",
+  "check",
+  "clippy",
+  "test",
+  "code-coverage",
+  "docs",
+  "build",
+  "audit-flow",
+  "outdated-flow",
+]
 
+# Run cargo-tarpaulin and output the test coverage.
 [tasks.code-coverage]
 workspace = false
-install_crate = "cargo-tarpaulin"
 command = "cargo"
 args = [
   "tarpaulin",
@@ -35,5 +23,10 @@ args = [
   "--out=html",
   "--output-dir=coverage",
   "--skip-clean",
-  "--target-dir=target/tarpaulin"
+  "--target-dir=target/tarpaulin",
 ]
+
+# Do a source code spellcheck.
+[tasks.spellcheck]
+clear = true
+command = "typos"

flake.lock

@@ -0,0 +1,128 @@
+{
+  "nodes": {
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1705309234,
+        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "flake-utils_2": {
+      "inputs": {
+        "systems": "systems_2"
+      },
+      "locked": {
+        "lastModified": 1705309234,
+        "narHash": "sha256-uNRRNRKmJyCRC/8y1RqBkqWBLM034y4qN7EprSdmgyA=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "1ef2e671c3b0c19053962c07dbda38332dcebf26",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1706589919,
+        "narHash": "sha256-pNHnDITxSI3a17GOF1RUF3jBO1OiNYTRH2yV/cJG4m4=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "222c1940fafeda4dea161858ffe6ebfc853d3db5",
+        "type": "github"
+      },
+      "original": {
+        "id": "nixpkgs",
+        "type": "indirect"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1706487304,
+        "narHash": "sha256-LE8lVX28MV2jWJsidW13D2qrHU/RUUONendL2Q/WlJg=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "90f456026d284c22b3e3497be980b2e47d0b28ac",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "flake-utils": "flake-utils",
+        "nixpkgs": "nixpkgs",
+        "rust-overlay": "rust-overlay"
+      }
+    },
+    "rust-overlay": {
+      "inputs": {
+        "flake-utils": "flake-utils_2",
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1706667075,
+        "narHash": "sha256-KBI5jcOWh9nsOFWj2SRq7vj+fPDf8Do8ceL582kFA70=",
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "rev": "2c993daf3136c6955fd13bfe215d0d4faf6090f1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "oxalica",
+        "repo": "rust-overlay",
+        "type": "github"
+      }
+    },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
+    "systems_2": {
+      "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

@@ -0,0 +1,17 @@
+{
+  inputs = {
+    flake-utils.url = "github:numtide/flake-utils";
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs = { self, nixpkgs, flake-utils, rust-overlay }:
+    flake-utils.lib.eachDefaultSystem (system:
+      let
+        overlays = [ (import rust-overlay) ];
+        pkgs = import nixpkgs { inherit system overlays; };
+      in
+      {
+        devShells.default = import ./shell.nix { inherit pkgs; };
+      }
+    );
+}

rustup-toolchain.toml

@@ -0,0 +1,3 @@
+[toolchain]
+channel = "stable"
+components = ["cargo", "clippy", "rustfmt", "rust-src"]

shell.nix

@@ -0,0 +1,18 @@
+{ pkgs ? import <nixpkgs> { } }:
+
+with pkgs;
+
+let
+  rustup-toolchain = rust-bin.fromRustupToolchainFile ./rustup-toolchain.toml;
+in
+mkShell rec {
+  packages = [
+    cargo-audit
+    cargo-edit
+    cargo-make
+    cargo-outdated
+    cargo-tarpaulin
+    rustup-toolchain
+    typos
+  ];
+}