[maintenance] Add plugins for debugging (#7998)

Author: dshevtsov

_plugins/debug/site_post_render.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+# Copyright © Magento, Inc. All rights reserved.
+# See COPYING.txt for license details.
+
+# To enable this plugin, add to your '_config.local.yml' the following:
+#
+# debug: site_post_render
+#
+# This plugin runs an IRB session (https://github.com/ruby/irb) of a Jekyll application in a serving mode when it's at a state after rendering the whole site, but before writing any files.
+# See the ":site, :post_render" hook: https://jekyllrb.com/docs/plugins/hooks/
+# Available objects to explore are 'site' and 'payload'.
+#
+# Several helpful methods (to use a method, chain to an object such as 'site.methods', 'payload.keys'):
+# - '.methods.sort'
+# - '.instance_variables.sort'
+# - '.keys.sort'
+#
+# Examples:
+#
+# To view available configuration data of the site
+# > payload.site.keys
+#
+# To view the number of pages:
+# > payload.site.pages.count
+#
+# To find a page by path and view its data:
+# > page = payload.site.pages.select { |page| page.path == 'cloud/env/variables-build.md' }[0]
+# > page.data
+#
+# To exit from the IRB session:
+# > exit!
+#
+Jekyll::Hooks.register :site, :post_render do |site, payload|
+  next unless site.config['serving']
+
+  # rubocop:disable Lint/Debugger
+  binding.irb if site.config['debug'] == 'site_post_render'
+  # rubocop:enable Lint/Debugger
+end

_plugins/debug/site_pre_render.rb

@@ -0,0 +1,40 @@
+# frozen_string_literal: true
+
+# Copyright © Magento, Inc. All rights reserved.
+# See COPYING.txt for license details.
+
+# To enable this plugin, add to your '_config.local.yml' the following:
+#
+# debug: site_pre_render
+#
+# This plugin runs an IRB session (https://github.com/ruby/irb) of a Jekyll application in a serving mode when it's at a state just before rendering the whole site.
+# See the ":site, :pre_render" hook: https://jekyllrb.com/docs/plugins/hooks/
+# Available objects to explore are 'site' and 'payload'.
+#
+# Several helpful methods (to use a method, chain to an object such as 'site.methods', 'payload.keys'):
+# - '.methods.sort'
+# - '.instance_variables.sort'
+# - '.keys.sort'
+#
+# Examples:
+#
+# To view available configuration data of the site
+# > payload.site.keys
+#
+# To view the number of pages:
+# > payload.site.pages.count
+#
+# To find a page by path and view its data:
+# > page = payload.site.pages.select { |page| page.path == 'cloud/env/variables-build.md' }[0]
+# > page.data
+#
+# To exit from the IRB session:
+# > exit!
+#
+Jekyll::Hooks.register :site, :pre_render do |site, payload|
+  next unless site.config['serving']
+
+  # rubocop:disable Lint/Debugger
+  binding.irb if site.config['debug'] == 'site_pre_render'
+  # rubocop:enable Lint/Debugger
+end