chore: add flake

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

.envrc

@@ -1 +1 @@
-use flake self#rust
+use flake

.gitignore

@@ -16,3 +16,13 @@ target/
 #  and can be added to the global gitignore or merged into this file.  For a more nuclear
 #  option (not recommended) you can uncomment the following to ignore the entire idea folder.
 #.idea/
+
+# ---> Nix
+# Ignore build outputs from performing a nix-build or `nix build` command
+result
+result-*
+
+# Ignore automatically generated direnv output
+.direnv
+
+.cargo/

flake.lock

@@ -0,0 +1,72 @@
+{
+  "nodes": {
+    "lib": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ],
+        "treefmt-nix": [
+          "treefmt-nix"
+        ]
+      },
+      "locked": {
+        "lastModified": 1758632667,
+        "narHash": "sha256-C0aBPv8vqTI1QNVhygZxL0f49UERx2UejVdtyz67jhs=",
+        "ref": "refs/heads/main",
+        "rev": "5e0737c20f3c265dbff604170a6433cc1e1a4b41",
+        "revCount": 8,
+        "type": "git",
+        "url": "https://git.karaolidis.com/karaolidis/nix-lib.git"
+      },
+      "original": {
+        "type": "git",
+        "url": "https://git.karaolidis.com/karaolidis/nix-lib.git"
+      }
+    },
+    "nixpkgs": {
+      "locked": {
+        "lastModified": 1760284886,
+        "narHash": "sha256-TK9Kr0BYBQ/1P5kAsnNQhmWWKgmZXwUQr4ZMjCzWf2c=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "cf3f5c4def3c7b5f1fc012b3d839575dbe552d43",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "root": {
+      "inputs": {
+        "lib": "lib",
+        "nixpkgs": "nixpkgs",
+        "treefmt-nix": "treefmt-nix"
+      }
+    },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": [
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1760120816,
+        "narHash": "sha256-gq9rdocpmRZCwLS5vsHozwB6b5nrOBDNc2kkEaTXHfg=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "761ae7aff00907b607125b2f57338b74177697ed",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    }
+  },
+  "root": "root",
+  "version": 7
+}

flake.nix

@@ -0,0 +1,92 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+
+    treefmt-nix = {
+      url = "github:numtide/treefmt-nix";
+      inputs.nixpkgs.follows = "nixpkgs";
+    };
+
+    lib = {
+      # FIXME: https://github.com/NixOS/nix/issues/12281
+      url = "git+https://git.karaolidis.com/karaolidis/nix-lib.git";
+      inputs = {
+        nixpkgs.follows = "nixpkgs";
+        treefmt-nix.follows = "treefmt-nix";
+      };
+    };
+  };
+
+  outputs =
+    inputs:
+    {
+      overlays.default =
+        final: prev:
+        let
+          pkgs = final;
+        in
+        {
+          fujicli = pkgs.rustPlatform.buildRustPackage {
+            pname = "fujicli";
+            version = "0.1.0";
+
+            src = ./.;
+            cargoLock.lockFile = ./Cargo.lock;
+          };
+        };
+    }
+    // (
+      let
+        system = "x86_64-linux";
+
+        pkgs = import inputs.nixpkgs {
+          inherit system;
+          config.allowUnfree = true;
+          overlays = [
+            inputs.lib.overlays.default
+            inputs.self.overlays.default
+          ];
+        };
+
+        treefmt = inputs.treefmt-nix.lib.evalModule pkgs ./treefmt.nix;
+      in
+      {
+        devShells.${system}.default = pkgs.mkShell {
+          packages = with pkgs; [
+            cargo
+            rustc
+            rustfmt
+            clippy
+            cargo-udeps
+            cargo-outdated
+          ];
+
+          shellHook = ''
+            TOP="$(git rev-parse --show-toplevel)"
+            export CARGO_HOME="$TOP/.cargo"
+          '';
+        };
+
+        packages.${system} = with pkgs; {
+          default = fujicli;
+          inherit fujicli;
+        };
+
+        formatter.${system} = treefmt.config.build.wrapper;
+
+        checks.${system} =
+          let
+            packages = pkgs.lib.mapAttrs' (
+              name: pkgs.lib.nameValuePair "package-${name}"
+            ) inputs.self.packages.${system};
+
+            devShells = pkgs.lib.mapAttrs' (
+              name: pkgs.lib.nameValuePair "devShell-${name}"
+            ) inputs.self.devShells.${system};
+
+            formatter.formatting = treefmt.config.build.check inputs.self;
+          in
+          packages // devShells // formatter;
+      }
+    );
+}

treefmt.nix

@@ -0,0 +1,15 @@
+{ ... }:
+{
+  projectRootFile = "flake.nix";
+
+  programs = {
+    nixfmt = {
+      enable = true;
+      strict = true;
+    };
+
+    rustfmt.enable = true;
+  };
+
+  settings.global.excludes = [ ".envrc" ];
+}