Add wildcard template dependencies.

9 files changed, 121 insertions, 12 deletions

diff --git a/actionview/CHANGELOG.md b/actionview/CHANGELOG.md
index 1f6bb31cd4..55a2e155d1 100644
--- a/actionview/CHANGELOG.md
+++ b/actionview/CHANGELOG.md
@@ -1,3 +1,21 @@
+*   Add wildcard matching to explicit dependencies.
+
+    Turns:
+
+    ```erb
+    <% # Template Dependency: recordings/threads/events/subscribers_changed %>
+    <% # Template Dependency: recordings/threads/events/completed %>
+    <% # Template Dependency: recordings/threads/events/uncompleted %>
+    ```
+
+    Into:
+
+    ```erb
+    <% # Template Dependency: recordings/threads/events/* %>
+    ```
+
+    *Kasper Timm Hansen*
+
 *   Allow defining explicit collection caching using a `# Template Collection: ...`
     directive inside templates.
 
diff --git a/actionview/lib/action_view/dependency_tracker.rb b/actionview/lib/action_view/dependency_tracker.rb
index 7a7e116dbb..6e8c7f8203 100644
--- a/actionview/lib/action_view/dependency_tracker.rb
+++ b/actionview/lib/action_view/dependency_tracker.rb
@@ -1,16 +1,18 @@
 require 'thread_safe'
+require 'action_view/path_set'
 
 module ActionView
   class DependencyTracker # :nodoc:
     @trackers = ThreadSafe::Cache.new
 
-    def self.find_dependencies(name, template)
+    def self.find_dependencies(name, template, view_paths = nil)
       tracker = @trackers[template.handler]
+      return [] unless tracker.present?
 
-      if tracker.present?
-        tracker.call(name, template)
+      if tracker.respond_to?(:supports_view_paths?) && tracker.supports_view_paths?
+        tracker.call(name, template, view_paths)
       else
-        []
+        tracker.call(name, template)
       end
     end
 
@@ -82,12 +84,16 @@ module ActionView
         (?:#{STRING}|#{VARIABLE_OR_METHOD_CHAIN})      # finally, the dependency name of interest
       /xm
 
-      def self.call(name, template)
-        new(name, template).dependencies
+      def self.supports_view_paths? # :nodoc:
+        true
+      end
+
+      def self.call(name, template, view_paths = nil)
+        new(name, template, view_paths).dependencies
       end
 
-      def initialize(name, template)
-        @name, @template = name, template
+      def initialize(name, template, view_paths = nil)
+        @name, @template, @view_paths = name, template, view_paths
       end
 
       def dependencies
@@ -142,8 +148,22 @@ module ActionView
           end
         end
 
+        def resolve_directories(wildcard_dependencies)
+          return [] unless @view_paths
+
+          wildcard_dependencies.each_with_object([]) do |query, templates|
+            @view_paths.find_all_with_query(query).each do |template|
+              templates << "#{File.dirname(query)}/#{File.basename(template).split('.').first}"
+            end
+          end
+        end
+
         def explicit_dependencies
-          source.scan(EXPLICIT_DEPENDENCY).flatten.uniq
+          dependencies = source.scan(EXPLICIT_DEPENDENCY).flatten.uniq
+
+          wildcards, explicits = dependencies.partition { |dependency| dependency[-1] == '*' }
+
+          (explicits + resolve_directories(wildcards)).uniq
         end
     end
 
diff --git a/actionview/lib/action_view/digestor.rb b/actionview/lib/action_view/digestor.rb
index 4224346a2f..9a8a4feb2e 100644
--- a/actionview/lib/action_view/digestor.rb
+++ b/actionview/lib/action_view/digestor.rb
@@ -72,7 +72,7 @@ module ActionView
     end
 
     def dependencies
-      DependencyTracker.find_dependencies(name, template)
+      DependencyTracker.find_dependencies(name, template, finder.view_paths)
     rescue ActionView::MissingTemplate
       logger.try :error, "  '#{name}' file doesn't exist, so no dependencies"
       []
diff --git a/actionview/lib/action_view/helpers/cache_helper.rb b/actionview/lib/action_view/helpers/cache_helper.rb
index 797d029317..636d7d4cc3 100644
--- a/actionview/lib/action_view/helpers/cache_helper.rb
+++ b/actionview/lib/action_view/helpers/cache_helper.rb
@@ -98,7 +98,19 @@ module ActionView
       #   <%# Template Dependency: todolists/todolist %>
       #   <%= render_sortable_todolists @project.todolists %>
       #
-      # The pattern used to match these is <tt>/# Template Dependency: (\S+)/</tt>,
+      # In some cases, like a single table inheritance setup, you might have
+      # a bunch of explicit dependencies. Instead of writing every template out,
+      # you can use a wildcard to match any template in a directory:
+      #
+      #   <%# Template Dependency: events/* %>
+      #   <%= render_categorizable_events @person.events %>
+      #
+      # This marks every template in the directory as a dependency. To find those
+      # templates, the wildcard path must be absolutely defined from app/views or paths
+      # otherwise added with +prepend_view_path+ or +append_view_path+.
+      # This way the wildcard for `app/views/recordings/events` would be `recordings/events/*` etc.
+      #
+      # The pattern used to match explicit dependencies is <tt>/# Template Dependency: (\S+)/</tt>,
       # so it's important that you type it out just so.
       # You can only declare one template dependency per line.
       #
diff --git a/actionview/lib/action_view/path_set.rb b/actionview/lib/action_view/path_set.rb
index 91ee2ea8f5..7a88f6bc50 100644
--- a/actionview/lib/action_view/path_set.rb
+++ b/actionview/lib/action_view/path_set.rb
@@ -61,6 +61,15 @@ module ActionView #:nodoc:
       find_all(path, prefixes, *args).any?
     end
 
+    def find_all_with_query(query) # :nodoc:
+      paths.each do |resolver|
+        templates = resolver.find_all_with_query(query)
+        return templates unless templates.empty?
+      end
+
+      []
+    end
+
     private
 
     def typecast(paths)
diff --git a/actionview/lib/action_view/template/resolver.rb b/actionview/lib/action_view/template/resolver.rb
index e7208cce49..28967f40a6 100644
--- a/actionview/lib/action_view/template/resolver.rb
+++ b/actionview/lib/action_view/template/resolver.rb
@@ -52,6 +52,7 @@ module ActionView
 
       def initialize
         @data = SmallCache.new(&KEY_BLOCK)
+        @query_cache = SmallCache.new
       end
 
       # Cache the templates returned by the block
@@ -70,8 +71,17 @@ module ActionView
         end
       end
 
+      def cache_query(query) # :nodoc:
+        if Resolver.caching?
+          @query_cache[query] ||= canonical_no_templates(yield)
+        else
+          yield
+        end
+      end
+
       def clear
         @data.clear
+        @query_cache.clear
       end
 
       private
@@ -116,6 +126,10 @@ module ActionView
       end
     end
 
+    def find_all_with_query(query) # :nodoc:
+      @cache.cache_query(query) { find_template_paths(File.join(@path, query)) }
+    end
+
   private
 
     delegate :caching?, to: :class
diff --git a/actionview/test/fixtures/digestor/events/_completed.html.erb b/actionview/test/fixtures/digestor/events/_completed.html.erb
new file mode 100644
index 0000000000..e69de29bb2
--- /dev/null
+++ b/actionview/test/fixtures/digestor/events/_completed.html.erb
diff --git a/actionview/test/fixtures/digestor/events/index.html.erb b/actionview/test/fixtures/digestor/events/index.html.erb
new file mode 100644
index 0000000000..bc45e41bcb
--- /dev/null
+++ b/actionview/test/fixtures/digestor/events/index.html.erb
@@ -0,0 +1 @@
+<% # Template Dependency: events/* %>
\ No newline at end of file
diff --git a/actionview/test/template/digestor_test.rb b/actionview/test/template/digestor_test.rb
index 24bc76cbbb..dde757b5a2 100644
--- a/actionview/test/template/digestor_test.rb
+++ b/actionview/test/template/digestor_test.rb
@@ -1,5 +1,6 @@
 require 'abstract_unit'
 require 'fileutils'
+require 'action_view/dependency_tracker'
 
 class FixtureTemplate
   attr_reader :source, :handler
@@ -15,12 +16,13 @@ end
 class FixtureFinder
   FIXTURES_DIR = "#{File.dirname(__FILE__)}/../fixtures/digestor"
 
-  attr_reader   :details
+  attr_reader   :details, :view_paths
   attr_accessor :formats
   attr_accessor :variants
 
   def initialize
     @details  = {}
+    @view_paths = ActionView::PathSet.new(['digestor'])
     @formats  = []
     @variants = []
   end
@@ -75,6 +77,34 @@ class TemplateDigestorTest < ActionView::TestCase
     end
   end
 
+  def test_explicit_dependency_wildcard
+    assert_digest_difference("events/index") do
+      change_template("events/_completed")
+    end
+  end
+
+  def test_explicit_dependency_wildcard_picks_up_added_file
+    old_caching, ActionView::Resolver.caching = ActionView::Resolver.caching, false
+
+    assert_digest_difference("events/index") do
+      add_template("events/_uncompleted")
+    end
+  ensure
+    remove_template("events/_uncompleted")
+    ActionView::Resolver.caching = old_caching
+  end
+
+  def test_explicit_dependency_wildcard_picks_up_removed_file
+    old_caching, ActionView::Resolver.caching = ActionView::Resolver.caching, false
+    add_template("events/_subscribers_changed")
+
+    assert_digest_difference("events/index") do
+      remove_template("events/_subscribers_changed")
+    end
+  ensure
+    ActionView::Resolver.caching = old_caching
+  end
+
   def test_second_level_dependency
     assert_digest_difference("messages/show") do
       change_template("comments/_comments")
@@ -319,4 +349,9 @@ class TemplateDigestorTest < ActionView::TestCase
         f.write "\nTHIS WAS CHANGED!"
       end
     end
+    alias_method :add_template, :change_template
+
+    def remove_template(template_name)
+      File.delete("digestor/#{template_name}.html.erb")
+    end
 end