feat: Find all asset by a regexp filemask or a filepath

+ finding all asset by a regexp filemask,
  i.e. /\.(?:svg|eot|woff|woff2|gif|ttf)$/
  what is required for example for the Foreman

CHANGELOG.md

@@ -5,6 +5,7 @@ Get upgrade notes from Sprockets 3.x to 4.x at https://github.com/rails/sprocket
 ## Master
 
 - Remove remaining support for Ruby < 2.4.[#672](https://github.com/rails/sprockets/pull/672)
+- Find all asset by a regexp filemask or a filepath.[#698](https://github.com/rails/sprockets/pull/698)
 
 ## 4.0.2
 

lib/sprockets/base.rb

@@ -129,6 +129,25 @@ def find_asset!(*args)
       end
     end
 
+    # Find all asset by a regexp filemask or a filepath.
+    def find_all_assets(*args, &block)
+      paths = config[:paths]
+
+      args.each do |arg|
+        if arg.is_a?(Regexp)
+          paths.each do |path|
+            files = Dir["#{path}/*"].select {|file| arg =~ file }
+
+            files.each do |file|
+              find_all_linked_assets(file, &block)
+            end
+          end
+        else
+          find_all_linked_assets(arg, &block)
+        end
+      end
+    end
+
     # Pretty inspect
     def inspect
       "#<#{self.class}:0x#{object_id.to_s(16)} " +

lib/sprockets/manifest.rb

@@ -122,7 +122,7 @@ def find(*args)
       environment = self.environment.cached
       promises = args.flatten.map do |path|
         Concurrent::Promise.execute(executor: executor) do
-          environment.find_all_linked_assets(path) do |asset|
+          environment.find_all_assets(path) do |asset|
             yield asset
           end
         end