feat: Add treefmt

flake.lock

@@ -86,11 +86,28 @@
         "type": "github"
       }
     },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1708475490,
+        "narHash": "sha256-g1v0TsWBQPX97ziznfJdWhgMyMGtoBFs102xSYO4syU=",
+        "owner": "nixos",
+        "repo": "nixpkgs",
+        "rev": "0e74ca98a74bc7270d28838369593635a5db3260",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nixos",
+        "ref": "nixos-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "flake-utils": "flake-utils",
         "nixpkgs": "nixpkgs",
         "snowfall-lib": "snowfall-lib",
+        "treefmt-nix": "treefmt-nix",
         "wiki": "wiki"
       }
     },
@@ -146,6 +163,24 @@
         "type": "github"
       }
     },
+    "treefmt-nix": {
+      "inputs": {
+        "nixpkgs": "nixpkgs_2"
+      },
+      "locked": {
+        "lastModified": 1715940852,
+        "narHash": "sha256-wJqHMg/K6X3JGAE9YLM0LsuKrKb4XiBeVaoeMNlReZg=",
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "rev": "2fba33a182602b9d49f0b2440513e5ee091d838b",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "treefmt-nix",
+        "type": "github"
+      }
+    },
     "wiki": {
       "flake": false,
       "locked": {

flake.nix

@@ -12,6 +12,8 @@
     flake = false;
   };
 
+  inputs.treefmt-nix.url = "github:numtide/treefmt-nix";
+
   outputs =
     inputs:
     inputs.snowfall-lib.mkFlake {
@@ -26,6 +28,11 @@
         namespace = "auxolotl--docs-site";
       };
 
-      outputs-builder = channels: { formatter = channels.nixpkgs.nixfmt-rfc-style; };
+      outputs-builder = channels: let
+        treefmt = inputs.treefmt-nix.lib.evalModule channels.nixpkgs ./treefmt.nix;
+      in {
+        formatter = treefmt.config.build.wrapper;
+        checks.formatting = treefmt.config.build.check inputs.self;
+      };
     };
 }

treefmt.nix

@@ -0,0 +1,28 @@
+# treefmt.nix
+{ pkgs, ... }:
+{
+  # Used to find the project root
+  projectRootFile = "flake.nix";
+
+  # go
+  programs.gofmt.enable = true;
+
+  # js/ts
+  programs.prettier.enable = true;
+
+  # markdown
+  programs.mdformat.enable = true;
+
+  # nix
+  programs.nixfmt-rfc-style.enable = true;
+  programs.statix.enable = true;
+
+  # python
+  programs.black.enable = true;
+
+  # rust
+  programs.rustfmt.enable = true;
+
+  # swift
+  programs.swift-format.enable = true;
+}