Update docs examples to use nixfmt-rfc-style

This is now the chosen formatter for nixpkgs.

README.md

@@ -70,7 +70,7 @@ Merge this setting into your `coc-settings.json` (open with `:CocConfig`).
       // Uncomment these to tweak settings.
       // "settings": {
       //   "nil": {
-      //     "formatting": { "command": ["nixpkgs-fmt"] }
+      //     "formatting": { "command": ["nixfmt"] }
       //   }
       // }
     }
@@ -108,7 +108,7 @@ Add the following elisp code to your configuration. (using `use-package`)
   :after (lsp-mode)
   :demand t
   :custom
-  (lsp-nix-nil-formatter ["nixpkgs-fmt"]))
+  (lsp-nix-nil-formatter ["nixfmt"]))
 
 (use-package nix-mode
   :hook (nix-mode . lsp-deferred)
@@ -144,7 +144,7 @@ Modify the extension's settings in your `settings.json`.
   // Uncomment these to tweak settings.
   // "nix.serverSettings": {
   //   "nil": {
-  //     "formatting": { "command": ["nixpkgs-fmt"] }
+  //     "formatting": { "command": ["nixfmt"] }
   //   }
   // }
 }

dev/nvim-lsp.nix

@@ -88,7 +88,7 @@ let
         ['nil'] = {
           testSetting = 42,
           formatting = {
-            command = { "nixpkgs-fmt" },
+            command = { "nixfmt" },
           },
         },
       },

dev/vim-coc.nix

@@ -97,7 +97,7 @@ let
     nil.server.path = pkgs.writeShellScript "nil" ''
       exec "$NIL_PATH" "$@"
     '';
-    nil.formatting.command = [ "${pkgs.nixpkgs-fmt}/bin/nixpkgs-fmt" ];
+    nil.formatting.command = [ (pkgs.lib.getExe pkgs.nixfmt-rfc-style) ];
     nil.diagnostics.excludedFiles = [ "generated.nix" ];
     nil.nix.flake.autoEvalInputs = true;
     nil.nix.maxMemoryMB = 2048;

docs/configuration.md

@@ -23,7 +23,7 @@ Default configuration:
       // External formatter command (with arguments).
       // It should accepts file content in stdin and print the formatted code into stdout.
       // Type: [string] | null
-      // Example: ["nixpkgs-fmt"]
+      // Example: ["nixfmt"]
       "command": null,
     },
     "diagnostics": {

flake.nix

@@ -116,7 +116,7 @@ rec {
 
               jq
               pre-commit
-              nixpkgs-fmt
+              nixfmt-rfc-style
               (import ./dev/nvim-lsp.nix { inherit pkgs; })
               (import ./dev/vim-coc.nix { inherit pkgs; })
               (import ./dev/vim-lsp.nix { inherit pkgs; })