Remove auto-mount

README.md

@@ -40,9 +40,21 @@ group :development do
 end
 ```
 
-Lookbook will automatically be mounted at `/lookbook` within your app when the server is started.
+Mount Lookbook at a path of your choosing in your `config/routes.rb` file:
 
-> 🚨 Previously Lookbook required manual mounting in your app. This is **no longer the case**, so if trialing v3 in a project with an existing Lookbook install you must remove [the mounting code](https://lookbook.build/guide/installation#step-2) from your routes.rb file first.
+```rb
+Rails.application.routes.draw do
+  if Rails.env.development?
+    mount Lookbook::Engine => "/lookbook"
+  end
+end
+```
+
+> The mount path (`/lookbook` in the example above) will be the URL that the Lookbook UI will be made accessible at within your app.
+
+Once everything is installed, start your app as normal.
+
+Assuming your app is running on port 3000 and you mounted Lookbook at the path `/lookbook` then browse to http://localhost:3000/lookbook to view the Lookbook UI.
 
 ### Configuration
 

config/routes.rb

@@ -17,10 +17,3 @@
 
   match "*path", to: "application#not_found", via: :all
 end
-
-Rails.application.routes.draw do
-  get "#{Lookbook.config.mount_path}/render_scenario/:preview/:scenario",
-    to: "#{Lookbook.config.preview_controller.sub(/Controller$/, "").underscore}#lookbook_render_scenario",
-    as: :lookbook_render_scenario,
-    internal: true
-end

lib/lookbook/config.rb

@@ -56,9 +56,7 @@ def defaults
 
           languages: default_languages,
 
-          reload_on_change: dev?,
-          mount_path: "/lookbook",
-          auto_mount: true
+          reload_on_change: dev?
         })
       end
 

lib/lookbook/engine.rb

@@ -12,14 +12,21 @@ class Engine < Rails::Engine
       YARD::Parser::Ruby::RipperParser.prepend YardParserPatch
     end
 
-    config.after_initialize do
+    config.after_initialize do |app|
       ViewComponentConfigSync.call if Gem.loaded_specs.has_key?("view_component")
 
       preview_controller = Lookbook.config.preview_controller.constantize
       unless preview_controller.include?(Lookbook::PreviewControllerActions)
         preview_controller.include(Lookbook::PreviewControllerActions)
       end
 
+      app.routes.prepend do
+        get "#{Engine.mount_path}/render_scenario/:preview/:scenario",
+          to: "#{Lookbook.config.preview_controller.sub(/Controller$/, "").underscore}#lookbook_render_scenario",
+          as: :lookbook_render_scenario,
+          internal: true
+      end
+
       boot!
     end
 
@@ -44,7 +51,7 @@ def boot!
       end
 
       def mount_path
-        config.lookbook.mount_path || Lookbook::Config.defaults.mount_path
+        "/" + Utils.strip_slashes(routes.find_script_name({}))
       end
 
       def view_paths

test/demo/config/routes.rb

@@ -2,4 +2,6 @@
 
 Rails.application.routes.draw do
   root "demo#index"
+
+  mount Lookbook::Engine => "/lookbook"
 end