Add plugin to redirect 2.3 pages

Author: dshevtsov

_plugins/page-params/redirect_23.rb

@@ -0,0 +1,42 @@
+# Copyright 2023 Adobe
+# All Rights Reserved.
+# 
+# NOTICE: All information contained herein is, and remains
+# the property of Adobe and its suppliers, if any. The intellectual
+# and technical concepts contained herein are proprietary to Adobe
+# and its suppliers and are protected by all applicable intellectual
+# property laws, including trade secret and copyright laws.
+# Dissemination of this information or reproduction of this material
+# is strictly forbidden
+
+# This plugin redirects 2.3 pages to the DevSite.
+# It uses redirect metadata from the 2.4 version of the page.
+# If there is no 2.4 version of the page, then it redirects to https://developer.adobe.com/commerce/docs/
+
+Jekyll::Hooks.register :pages, :post_init do |page|
+  # Skip pages where the parameter is already set
+  next unless page.path.start_with? 'guides/v2.3/'
+
+  # Process only files with 'md' and 'html' extensions
+  next unless File.extname(page.path).match?(/md|html/)
+
+  # Skip redirects
+  next if page.name == 'redirect.html'
+
+  # Skip pages where the parameter is already set
+  next if page.data['redirect_to']
+
+  pages = page.site.pages
+
+  path_23 = page.path
+
+  path_24 = path_23.sub('/v2.3/', '/v2.4/')
+
+  page_24 = pages.find { |page| page.path == path_24 }
+  
+  if page_24.nil?
+    page.data['redirect_to'] = 'https://developer.adobe.com/commerce/docs/'
+  else
+    page.data['redirect_to'] = page_24.data['redirect_to']
+  end
+end