fix: Avoid scanning and building entries for silenced directories

Building entries that will be ignored by the listener degrades the
initialization performance, and can greatly increase memory consumption.

Specially on projects with large .git or node_modules directories.

lib/listen/adapter/base.rb

@@ -51,7 +51,7 @@ def configure
         # TODO: separate config per directory (some day maybe)
         change_config = Change::Config.new(config.queue, config.silencer)
         config.directories.each do |dir|
-          record = Record.new(dir)
+          record = Record.new(dir, config.silencer)
           snapshot = Change.new(change_config, record)
           @snapshots[dir] = snapshot
         end

lib/listen/record.rb

@@ -11,9 +11,10 @@ class Record
 
     attr_reader :root
 
-    def initialize(directory)
+    def initialize(directory, silencer)
       @tree = _auto_hash
       @root = directory.to_s
+      @silencer = silencer
     end
 
     def add_dir(rel_path)
@@ -98,6 +99,8 @@ def _fast_unset_path(dirname, basename)
 
     def _fast_build_dir(remaining, symlink_detector)
       entry = remaining.pop
+      return if @silencer.silenced?(entry.record_dir_key, :dir)
+
       children = entry.children # NOTE: children() implicitly tests if dir
       symlink_detector.verify_unwatched!(entry)
       children.each { |child| remaining << child }

spec/lib/listen/record_spec.rb

@@ -2,7 +2,8 @@
 
 RSpec.describe Listen::Record do
   let(:dir) { instance_double(Pathname, to_s: '/dir') }
-  let(:record) { Listen::Record.new(dir) }
+  let(:silencer) { Listen::Silencer.new }
+  let(:record) { Listen::Record.new(dir, silencer) }
 
   def dir_entries_for(hash)
     hash.each do |dir, entries|
@@ -308,9 +309,11 @@ def record_tree(record)
 
     context 'with subdir containing files' do
       before do
-        real_directory('/dir' => %w[dir1 dir2])
+        real_directory('/dir' => %w[dir1 dir2 .git])
+        real_directory('/dir/.git' => %w[FETCH_HEAD])
         real_directory('/dir/dir1' => %w[foo])
         real_directory('/dir/dir1/foo' => %w[bar])
+        lstat(file('/dir/.git/FETCH_HEAD'))
         lstat(file('/dir/dir1/foo/bar'))
         real_directory('/dir/dir2' => [])
       end