all: use treefmt for formatting everything

lib/default.nix

@@ -101,6 +101,8 @@ let
         ssh-to-age
         ssh-to-pgp
         statix
+        treefmt2
+        perlPackages.PerlTidy
       ];
     };
 

treefmt.toml

@@ -0,0 +1,28 @@
+[formatter.statix]
+command = "statix"
+options = ["check"]
+priority = 1
+
+[formatter.deadnix]
+command = "deadnix"
+options = ["-f"]
+includes = [ "*.nix" ]
+priority = 2
+
+[formatter.nix]
+command = "nix"
+options = ["fmt"]
+includes = ["*.nix"]
+priority = 3
+
+[formatter.shfmt]
+command = "shfmt"
+options = ["-w"]
+includes = ["*.sh", "bin/*"]
+priority = 1
+
+[formatter.perltidy]
+command = "perltidy"
+options = ["-b"]
+includes = ["*.pl", "*.PL"]
+priority = 1