Ensure builds are added and stylesheets removed under Sprockets

Author: dhh

lib/install/dartsass.rb

@@ -5,6 +5,13 @@
 empty_directory "app/assets/builds"
 keep_file "app/assets/builds"
 
+if (sprockets_manifest_path = Rails.root.join("app/assets/config/manifest.js")).exist?
+  append_to_file sprockets_manifest_path, %(//= link_tree ../builds\n)
+
+  say "Stop linking stylesheets automatically"
+  gsub_file "app/assets/config/manifest.js", "//= link_directory ../stylesheets .css\n", ""
+end
+
 if Rails.root.join(".gitignore").exist?
   append_to_file(".gitignore", %(\n/app/assets/builds/*\n!/app/assets/builds/.keep\n))
 end