formatting: add pre-commit hook to dev shell

flake-parts/devShells/default.nix

@@ -2,9 +2,14 @@
   perSystem =
     { pkgs
     , self'
+    , config
     , ...
     }: {
       devShells.default = pkgs.mkShell {
+        inputsFrom = [
+          config.pre-commit.devShell
+          config.treefmt.build.devShell
+        ];
         packages = [
           pkgs.tea
           self'.packages.tea-create-pr

flake-parts/formatting.nix

@@ -3,9 +3,10 @@
 , ...
 }: {
   imports = [
+    inputs.pre-commit-hooks-nix.flakeModule
     inputs.treefmt-nix.flakeModule
   ];
-  perSystem = { pkgs, ... }: {
+  perSystem = { pkgs, config, ... }: {
     treefmt.projectRootFile = "flake.nix";
     treefmt.flakeCheck = true;
     treefmt.flakeFormatter = true;
@@ -36,5 +37,16 @@
       ];
       includes = [ "*.py" ];
     };
+
+    # activated in devShells via inputsFrom = [config.pre-commit.devShell];
+    pre-commit.settings.hooks.format-all = {
+      name = "format-all";
+      enable = true;
+      pass_filenames = true;
+      entry = toString (pkgs.writeScript "treefmt" ''
+        #!${pkgs.bash}/bin/bash
+        ${config.treefmt.build.wrapper}/bin/treefmt --clear-cache --fail-on-change "$@"
+      '');
+    };
   };
 }

flake-parts/pre-commit.nix

@@ -1,4 +0,0 @@
-{ ... }: {
-  pre-commit.settings.hooks.alejandra.enable = true;
-  pre-commit.settings.hooks.shellcheck.enable = true;
-}