Move and re-namespace HeadVersion

Library/Homebrew/version.rb

@@ -2,6 +2,7 @@
 # frozen_string_literal: true
 
 require "pkg_version"
+require "version/head"
 require "version/null"
 require "version/parser"
 
@@ -676,34 +677,3 @@ class Version
     version.scan(SCAN_PATTERN).map { |token| Token.create(T.cast(token, String)) }
   end
 end
-
-# A formula's HEAD version.
-# @see https://docs.brew.sh/Formula-Cookbook#unstable-versions-head Unstable versions (head)
-#
-# @api private
-class HeadVersion < Version
-  extend T::Sig
-
-  sig { returns(T.nilable(String)) }
-  attr_reader :commit
-
-  def initialize(*)
-    super
-    @commit = @version[/^HEAD-(.+)$/, 1]
-  end
-
-  sig { params(commit: T.nilable(String)).void }
-  def update_commit(commit)
-    @commit = commit
-    @version = if commit
-      "HEAD-#{commit}"
-    else
-      "HEAD"
-    end
-  end
-
-  sig { returns(T::Boolean) }
-  def head?
-    true
-  end
-end

Library/Homebrew/version/head.rb

@@ -0,0 +1,36 @@
+# typed: true
+# frozen_string_literal: true
+
+class Version
+  # A formula's HEAD version.
+  # @see https://docs.brew.sh/Formula-Cookbook#unstable-versions-head Unstable versions (head)
+  #
+  # @api private
+  class HeadVersion < Version
+    extend T::Sig
+
+    sig { returns(T.nilable(String)) }
+    attr_reader :commit
+
+    def initialize(*)
+      super
+      @commit = @version[/^HEAD-(.+)$/, 1]
+    end
+
+    sig { params(commit: T.nilable(String)).void }
+    def update_commit(commit)
+      @commit = commit
+      @version = if commit
+        "HEAD-#{commit}"
+      else
+        "HEAD"
+      end
+    end
+
+    sig { returns(T::Boolean) }
+    def head?
+      true
+    end
+  end
+
+end