From 783ac66a108500001cc0421ae6fe4546ab56fa73 Mon Sep 17 00:00:00 2001
From: Martin Meyerhoff <mamhoff@gmail.com>
Date: Wed, 11 Dec 2024 15:04:50 +0100
Subject: [PATCH] Support Flickwerk-style patches

This enables using patches (i.e. "decorators"/"overrides") in Solidus
engines, but using the style described in the Flickwerk README[^1]

In short, this allows autoloading patches whenever the file being
patches is loaded by Zeitwerk.

The new directory to put your patches into would be `app/patches`, and
the files inside should be named `my_extension/spree_user_patch.rb` and
define a constant `MyExtension::SpreeUserPatch`. The convention is that
the module prepends itself to the class being patched, in this example
`Spree::User`.

[^1] https://github.com/friendlycart/flickwerk/blob/main/README.md
---
 lib/solidus_support/engine_extensions.rb | 13 +++++++++++++
 solidus_support.gemspec                  |  3 +++
 2 files changed, 16 insertions(+)

diff --git a/lib/solidus_support/engine_extensions.rb b/lib/solidus_support/engine_extensions.rb
index cca58b4..65e52e5 100644
--- a/lib/solidus_support/engine_extensions.rb
+++ b/lib/solidus_support/engine_extensions.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 require "active_support/deprecation"
+require "flickwerk"
 
 module SolidusSupport
   module EngineExtensions
@@ -9,6 +10,7 @@ module EngineExtensions
 
     def self.included(engine)
       engine.extend ClassMethods
+      engine.include Flickwerk
 
       engine.class_eval do
         solidus_decorators_root.glob('*') do |decorators_folder|
@@ -106,6 +108,17 @@ def enable_solidus_engine_support(engine)
             end
           end
         end
+
+        initializer "#{name}_#{engine}_patch_paths", after: "flickwerk.add_paths" do
+          patch_paths = root.join("lib/patches/#{engine}").glob("*")
+          Flickwerk.patch_paths += patch_paths
+        end
+
+        initializer "#{name}_#{engine}_user_patches", before: "flickwerk.add_patches" do
+          Flickwerk.patches.transform_keys! do |key|
+            key.gsub("Spree.user_class", Spree.user_class_name)
+          end
+        end
       end
     end
   end
diff --git a/solidus_support.gemspec b/solidus_support.gemspec
index 563248d..0c97da3 100644
--- a/solidus_support.gemspec
+++ b/solidus_support.gemspec
@@ -28,6 +28,9 @@ Gem::Specification.new do |spec|
   spec.executables = files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ["lib"]
 
+  spec.add_dependency 'flickwerk', '~> 0.2.0'
+  spec.add_dependency 'solidus_core', '~> 4.1'
+
   spec.add_development_dependency 'rails'
   spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'rake'