add script to update new major

Author: jaysoo

README.md

@@ -10,3 +10,17 @@ brew install nx
 nx --version
 ```
 
+## New Major Version
+
+Run the script:
+
+```
+./create_new_major.rb 22.0.0
+```
+
+This will create the new `nx.rb` file and rename the existing major version to `nx@<major>.rb`. You can then open a PR with this version and let CI verify it. To install the new version:
+
+```shell
+brew update
+brew upgrade nx
+```

create_new_major.rb

@@ -0,0 +1,86 @@
+#!/usr/bin/env ruby
+
+require 'open-uri'
+require 'digest'
+require 'fileutils'
+
+def calculate_sha256(url)
+  content = URI.open(url).read
+  Digest::SHA256.hexdigest(content)
+end
+
+def rename_current_formula
+  current_file = 'Formula/nx.rb'
+  return unless File.exist?(current_file)
+
+  content = File.read(current_file)
+  version_match = content.match(/url ".*nx-(\d+\.\d+\.\d+)\.tgz"/)
+  return unless version_match
+
+  current_version = version_match[1]
+  new_file = "Formula/nx@#{current_version.split('.').first}.rb"
+  
+  # Update class name in content
+  updated_content = content.gsub(/class Nx/, "class NxAT#{current_version.split('.').first}")
+  
+  # Write to new file and remove old file
+  File.write(new_file, updated_content)
+  File.delete(current_file)
+  
+  puts "Renamed #{current_file} to #{new_file}"
+end
+
+def create_new_formula(version)
+  url = "https://registry.npmjs.org/nx/-/nx-#{version}.tgz"
+  sha256 = calculate_sha256(url)
+  
+  template = <<~RUBY
+    require "language/node"
+
+    class Nx < Formula
+      desc "Smart, Fast and Extensible Build System"
+      homepage "https://nx.dev"
+      url "#{url}"
+      sha256 "#{sha256}"
+      license "MIT"
+
+      livecheck do
+        url :stable
+      end
+
+      depends_on "node@22"
+
+      def install
+        system "npm", "install", *Language::Node.std_npm_install_args(libexec)
+        bin.install_symlink Dir["\#{libexec}/bin/*"]
+      end
+
+      test do
+        # Create a temporary directory for testing
+        testdir = testpath/"test-project"
+        testdir.mkdir
+        testdir.cd do
+          system bin/"nx", "--version"
+        end
+      end
+    end
+  RUBY
+
+  File.write('Formula/nx.rb', template)
+  puts "Created new Formula/nx.rb with version #{version}"
+end
+
+if ARGV.empty?
+  puts "Usage: #{$0} <version>"
+  puts "Example: #{$0} 21.0.4"
+  exit 1
+end
+
+version = ARGV[0]
+unless version.match?(/^\d+\.\d+\.\d+$/)
+  puts "Error: Version must be in format X.Y.Z"
+  exit 1
+end
+
+rename_current_formula
+create_new_formula(version)