1 files changed, 54 insertions, 0 deletions
diff --git a/lib/dtas/watchable.rb b/lib/dtas/watchable.rb
new file mode 100644
index 0000000..d4c384c
--- /dev/null
+++ b/lib/dtas/watchable.rb
@@ -0,0 +1,54 @@
+# Copyright (C) 2014, all contributors <dtas-all@nongnu.org>
+# License: GPLv3 or later <https://www.gnu.org/licenses/gpl-3.0.txt>
+begin
+  require 'sleepy_penguin'
+rescue LoadError
+end
+
+# used to restart DTAS::Source::SplitFX processing in dtas-player
+# if the YAML file is edited
+module DTAS::Watchable
+  class InotifyReadableIter < SleepyPenguin::Inotify
+    def self.new
+      super(:CLOEXEC)
+    end
+
+    FLAGS = CLOSE_WRITE | MOVED_TO
+
+    def readable_iter
+      or_call = false
+      while event = take(true) # drain the buffer
+        if (event.mask & FLAGS) != 0 && @watching[1] == event.name
+          or_call = true
+        end
+      end
+      if or_call && @on_readable
+        @on_readable.call
+        :delete
+      else
+        :wait_readable
+      end
+    end
+
+    # we must watch the directory, since
+    def watch_file(path, blk)
+      @on_readable = blk
+      @watching = File.split(File.expand_path(path))
+      add_watch(@watching[0], FLAGS)
+    end
+  end
+
+  def watch_begin(blk)
+    @ino = InotifyReadableIter.new
+    @ino.watch_file(@infile, blk)
+    @ino
+  end
+
+  # Closing the inotify descriptor (instead of using inotify_rm_watch)
+  # is cleaner because it avoids EINVAL on race conditions in case
+  # a directory is deleted: https://lkml.org/lkml/2007/7/9/3
+  def watch_end(srv)
+    srv.wait_ctl(@ino, :delete)
+    @ino = @ino.close
+  end
+end if defined?(SleepyPenguin::Inotify)