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-rw-r--r--flake.nix9
-rw-r--r--ops/ci/fmt.nix27
2 files changed, 34 insertions, 2 deletions
diff --git a/flake.nix b/flake.nix
index 86d32c8..db58906 100644
--- a/flake.nix
+++ b/flake.nix
@@ -29,7 +29,7 @@
   };
 
   # Output config, or config for NixOS system
-  outputs = { ... }@inputs:
+  outputs = { self, ... }@inputs:
     let lib = import ./nix { inherit inputs; };
     in
     {
@@ -42,7 +42,9 @@
       let
         pkgs = import inputs.nixpkgs { inherit system; };
         home-manager = inputs.home-manager.defaultPackage."${system}";
-      in {
+        ci = import ./ops/ci/fmt.nix { inherit pkgs; };
+      in
+      {
         packages = pkgs // {
           inherit home-manager;
 
@@ -58,6 +60,9 @@
           };
         };
 
+        # `nix run .#ci.format` formats in current directory!
+        apps.ci.format = ci.mkFmtScript self;
+
         devShell = pkgs.mkShell {
           buildInputs = with pkgs; [
             nixUnstable
diff --git a/ops/ci/fmt.nix b/ops/ci/fmt.nix
new file mode 100644
index 0000000..a3d697c
--- /dev/null
+++ b/ops/ci/fmt.nix
@@ -0,0 +1,27 @@
+{ pkgs, ... }:
+let
+  config = pkgs.writeText "depot-treefmt-config" ''
+    [formatter.go]
+    command = "${pkgs.go}/bin/gofmt"
+    includes = ["*.go"]
+
+    [formatter.nix]
+    command = "${pkgs.nixpkgs-fmt}/bin/nixpkgs-fmt"
+    options = [ "--check"]
+    includes = [ "*.nix" ]
+  '';
+in
+rec {
+  mkFmtScript = src:
+    let
+      script = pkgs.writeScript "format" ''
+        set -euo pipefail
+        ROOT=$(${pkgs.git}/bin/git rev-parse --show-toplevel)
+        ${pkgs.treefmt}/bin/treefmt --clear-cache --fail-on-change --config-file ${config} --tree-root $ROOT
+      '';
+    in
+    {
+      type = "app";
+      program = "${script}";
+    };
+}