Class: FireflyServer::FileWatcher

Inherits:
Object
  • Object
show all
Defined in:
lib/firefly_server/file_watcher.rb

Defined Under Namespace

Classes: ChangeEvent

Instance Method Summary collapse

Constructor Details

#initialize(configuration) ⇒ FileWatcher

Returns a new instance of FileWatcher.



7
8
9
10
 
# File 'lib/firefly_server/file_watcher.rb', line 7

def initialize(configuration)
  @configuration = configuration
  @listener = nil
end

Instance Method Details

#watch!(&on_change_callback) ⇒ Object 



12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
 
# File 'lib/firefly_server/file_watcher.rb', line 12

def watch!(&on_change_callback)
  # prevent multiple listeners
  listener.stop if listener
  # always mute the Listen logger due to verbosity
  if !Listen.logger
    Listen.logger = Logger.new(STDOUT)
    Listen.logger.level = Logger::WARN
  end
  @listener = Listen.to(*configuration.watch_paths) do |modified, added, removed|
    ignored = []
    [modified, added, removed].each do |paths|
      # remove ignored paths
      paths.reject! do |path|
        configuration.ignore_paths.any? do |ignore_path|
          is_ignored =
            case ignore_path
            when String then path.start_with?(ignore_path)
            when Regexp then path =~ ignore_path
            else
              raise(
                ArgumentError,
                "unknown ignore path (expected string or regex): #{ignore_path.class} - #{ignore_path.inspect}"
              )
            end
          ignored << path if is_ignored
        end
      end
    end
    # trigger change callbacks
    callbacks = (configuration.on_change_callbacks + [on_change_callback]).compact
    if !callbacks.empty?
      change_event = ChangeEvent.new(
        ignored: ignored,
        modified: modified,
        added: added,
        removed: removed
      )
      callbacks.each do |callback|
        callback.call(change_event)
      end
    end
  end
  listener.start
  self
end