formatting: add pre-commit hook to dev shell

.gitignore

@@ -1,5 +1,6 @@
 .direnv
 result*
+.pre-commit-config.yaml
 
 # python
 __pycache__

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;
-}

flake.lock

@@ -20,6 +20,22 @@
         "type": "github"
       }
     },
+    "flake-compat": {
+      "flake": false,
+      "locked": {
+        "lastModified": 1673956053,
+        "narHash": "sha256-4gtG9iQuiKITOjNQQeQIpoIB6b16fm+504Ch3sNKLd8=",
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "rev": "35bb57c0c8d8b62bbfd284272c928ceb64ddbde9",
+        "type": "github"
+      },
+      "original": {
+        "owner": "edolstra",
+        "repo": "flake-compat",
+        "type": "github"
+      }
+    },
     "flake-parts": {
       "inputs": {
         "nixpkgs-lib": [
@@ -40,6 +56,45 @@
         "type": "github"
       }
     },
+    "flake-utils": {
+      "inputs": {
+        "systems": "systems"
+      },
+      "locked": {
+        "lastModified": 1685518550,
+        "narHash": "sha256-o2d0KcvaXzTrPRIo0kOLV0/QXHhDQ5DTi+OxcjO8xqY=",
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "rev": "a1720a10a6cfe8234c0e93907ffe81be440f4cef",
+        "type": "github"
+      },
+      "original": {
+        "owner": "numtide",
+        "repo": "flake-utils",
+        "type": "github"
+      }
+    },
+    "gitignore": {
+      "inputs": {
+        "nixpkgs": [
+          "pre-commit-hooks-nix",
+          "nixpkgs"
+        ]
+      },
+      "locked": {
+        "lastModified": 1660459072,
+        "narHash": "sha256-8DFJjXG8zqoONA1vXtgeKXy68KdJL5UaXR8NtVMUbx8=",
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "rev": "a20de23b925fd8264fd7fad6454652e142fd7f73",
+        "type": "github"
+      },
+      "original": {
+        "owner": "hercules-ci",
+        "repo": "gitignore.nix",
+        "type": "github"
+      }
+    },
     "nixlib": {
       "locked": {
         "lastModified": 1688259758,
@@ -92,15 +147,85 @@
         "type": "github"
       }
     },
+    "nixpkgs-stable": {
+      "locked": {
+        "lastModified": 1685801374,
+        "narHash": "sha256-otaSUoFEMM+LjBI1XL/xGB5ao6IwnZOXc47qhIgJe8U=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "c37ca420157f4abc31e26f436c1145f8951ff373",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixos-23.05",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "nixpkgs_2": {
+      "locked": {
+        "lastModified": 1689261696,
+        "narHash": "sha256-LzfUtFs9MQRvIoQ3MfgSuipBVMXslMPH/vZ+nM40LkA=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "df1eee2aa65052a18121ed4971081576b25d6b5c",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
+    "pre-commit-hooks-nix": {
+      "inputs": {
+        "flake-compat": "flake-compat",
+        "flake-utils": "flake-utils",
+        "gitignore": "gitignore",
+        "nixpkgs": "nixpkgs_2",
+        "nixpkgs-stable": "nixpkgs-stable"
+      },
+      "locked": {
+        "lastModified": 1690464206,
+        "narHash": "sha256-38V4kmOh6ikpfGiAS+Kt2H/TA2DubSqE66veP/jmB4Q=",
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "rev": "9289996dcac62fd45836db7c07b87d2521eb526d",
+        "type": "github"
+      },
+      "original": {
+        "owner": "cachix",
+        "repo": "pre-commit-hooks.nix",
+        "type": "github"
+      }
+    },
     "root": {
       "inputs": {
         "disko": "disko",
         "flake-parts": "flake-parts",
         "nixos-generators": "nixos-generators",
         "nixpkgs": "nixpkgs",
+        "pre-commit-hooks-nix": "pre-commit-hooks-nix",
         "treefmt-nix": "treefmt-nix"
       }
     },
+    "systems": {
+      "locked": {
+        "lastModified": 1681028828,
+        "narHash": "sha256-Vy1rq5AaRuLzOxct8nz4T6wlgyUR7zLU309k9mBC768=",
+        "owner": "nix-systems",
+        "repo": "default",
+        "rev": "da67096a3b9bf56a91d16901293e51ba5b49a27e",
+        "type": "github"
+      },
+      "original": {
+        "owner": "nix-systems",
+        "repo": "default",
+        "type": "github"
+      }
+    },
     "treefmt-nix": {
       "inputs": {
         "nixpkgs": [

flake.nix

@@ -11,6 +11,7 @@
     flake-parts.inputs.nixpkgs-lib.follows = "nixpkgs";
     treefmt-nix.url = "github:numtide/treefmt-nix";
     treefmt-nix.inputs.nixpkgs.follows = "nixpkgs";
+    pre-commit-hooks-nix.url = "github:cachix/pre-commit-hooks.nix";
   };
 
   outputs = inputs @ { flake-parts, ... }: