issue #572: switch Kernel.warn and warn to adapter_warn

lib/listen/adapter.rb

@@ -36,7 +36,7 @@ def _usable_adapter_class
 
       def _warn_polling_fallback(options)
         msg = options.fetch(:polling_fallback_message, POLLING_FALLBACK_MESSAGE)
-        Kernel.warn "[Listen warning]:\n  #{msg}" if msg
+        Listen.adapter_warn("[Listen warning]:\n  #{msg}") if msg
       end
     end
   end

lib/listen/adapter/bsd.rb

@@ -34,7 +34,7 @@ def self.usable?
         require 'find'
         true
       rescue LoadError
-        Kernel.warn BUNDLER_DECLARE_GEM
+        Listen.adapter_warn(BUNDLER_DECLARE_GEM)
         false
       end
 

lib/listen/adapter/darwin.rb

@@ -30,7 +30,7 @@ def self.usable?
         require 'rb-fsevent'
         fsevent_version = Gem::Version.new(FSEvent::VERSION)
         return true if fsevent_version <= Gem::Version.new('0.9.4')
-        Kernel.warn INCOMPATIBLE_GEM_VERSION
+        Listen.adapter_warn(INCOMPATIBLE_GEM_VERSION)
         false
       end
 

lib/listen/adapter/windows.rb

@@ -20,7 +20,7 @@ def self.usable?
         Listen.logger.debug format('wdm - load failed: %s:%s', $ERROR_INFO,
                                    $ERROR_POSITION * "\n")
 
-        Kernel.warn BUNDLER_DECLARE_GEM
+        Listen.adapter_warn(BUNDLER_DECLARE_GEM)
         false
       end
 

lib/listen/record/symlink_detector.rb

@@ -30,6 +30,12 @@ def verify_unwatched!(entry)
         @real_dirs.add?(real_path) or _fail(entry.sys_path, real_path)
       end
 
+      # Leaving this stub here since some warning work-arounds were referring to it.
+      # Deprecated. Will be removed in Listen v4.0.
+      def warn(message)
+        Listen.adapter_warn(message)
+      end
+
       private
 
       def _fail(symlinked, real_path)

spec/lib/listen/adapter/darwin_spec.rb

@@ -35,7 +35,7 @@
       context 'with rb-fsevent > 0.9.4' do
         before { stub_const('FSEvent::VERSION', '0.9.6') }
         it 'shows a warning and should not be usable' do
-          expect(Kernel).to receive(:warn)
+          expect(Listen).to receive(:adapter_warn)
           expect(subject).to_not be_usable
         end
       end

spec/lib/listen/adapter_spec.rb

@@ -49,7 +49,7 @@
 
       it 'warns polling fallback with default message' do
         msg = described_class::POLLING_FALLBACK_MESSAGE
-        expect(Kernel).to receive(:warn).with("[Listen warning]:\n  #{msg}")
+        expect(Listen).to receive(:adapter_warn).with("[Listen warning]:\n  #{msg}")
         Listen::Adapter.select
       end
 
@@ -60,7 +60,7 @@
 
       it 'warns polling fallback with custom message if set' do
         expected_msg = "[Listen warning]:\n  custom fallback message"
-        expect(Kernel).to receive(:warn).with(expected_msg)
+        expect(Listen).to receive(:adapter_warn).with(expected_msg)
         msg = 'custom fallback message'
         Listen::Adapter.select(polling_fallback_message: msg)
       end