feat: pre-commit hook with no prerequisites

.pre-commit-hooks.yaml

@@ -1,4 +1,12 @@
 - id: alejandra
+  name: alejandra
+  description: Format Nix code with Alejandra.
+  entry: alejandra
+  language: rust
+  files: \.nix$
+  minimum_pre_commit_version: 2.21.0
+
+- id: alejandra-nix
   name: alejandra (Nix)
   description: Format Nix code with Alejandra.
   entry: .pre-commit-entry.sh

CHANGELOG.md

@@ -31,6 +31,7 @@ Types of changes
 
 - Thank you messages for the different people
   who have helped improving Alejandra.
+- A pre-commit hook with no prerequisites.
 
 ### Changed
 

integrations/pre-commit/README.md

@@ -12,9 +12,12 @@ repos:
     # Choose either the 'alejandra' or 'alejandra-system' hook
     # depending on what pre-requisites you have:
     hooks:
-      # Requires Nix to be previously installed in the system
+      # No prerequisites
       - id: alejandra
 
+      # Requires Nix to be previously installed in the system
+      - id: alejandra-nix
+
       # Requires Alejandra to be previously installed in the system
       - id: alejandra-system
 ```