chore: use opentofu instead of terraform (#399)

Avoids the unfree shenanigans

config/config_test.go

@@ -125,13 +125,13 @@ func TestReadConfigFile(t *testing.T) {
 	as.Equal([]string{"*.sh"}, shfmt.Includes)
 	as.Nil(shfmt.Excludes)
 
-	// terraform
-	terraform, ok := cfg.Formatters["terraform"]
-	as.True(ok, "terraform formatter not found")
-	as.Equal("terraform", terraform.Command)
-	as.Equal([]string{"fmt"}, terraform.Options)
-	as.Equal([]string{"*.tf"}, terraform.Includes)
-	as.Nil(terraform.Excludes)
+	// opentofu
+	opentofu, ok := cfg.Formatters["opentofu"]
+	as.True(ok, "opentofu formatter not found")
+	as.Equal("tofu", opentofu.Command)
+	as.Equal([]string{"fmt"}, opentofu.Options)
+	as.Equal([]string{"*.tf"}, opentofu.Includes)
+	as.Nil(opentofu.Excludes)
 
 	// missing
 	foo, ok := cfg.Formatters["foo-fmt"]

flake.nix

@@ -24,14 +24,9 @@
     };
   };
 
-  outputs = inputs: let
-    inherit (inputs.nixpkgs) lib;
-  in
+  outputs = inputs:
     inputs.blueprint {
       inherit inputs;
       prefix = "nix/";
-      nixpkgs.config = {
-        allowUnfreePredicate = pkg: builtins.elem (lib.getName pkg) ["terraform"];
-      };
     };
 }

nix/packages/treefmt/formatters.nix

@@ -15,7 +15,7 @@ with pkgs; [
   shfmt
   statix
   deadnix
-  terraform
+  opentofu
   dos2unix
   yamlfmt
   # util for unit testing

test/examples/treefmt.toml

@@ -80,10 +80,8 @@ options = ["-i", "2", "-s", "-w"]
 includes = ["*.sh"]
 priority = 2
 
-[formatter.terraform]
-# Careful, only terraform 1.3.0 or later accept a list of files.
-# see https://github.com/numtide/treefmt/issues/97
-command = "terraform"
+[formatter.opentofu]
+command = "tofu"
 options = ["fmt"]
 includes = ["*.tf"]