WIP: rename Fig to Compose

Signed-off-by: Aanand Prasad <aanand.prasad@gmail.com>

compose/cli/multiplexer.py

@@ -0,0 +1,42 @@
+from __future__ import absolute_import
+from threading import Thread
+
+try:
+    from Queue import Queue, Empty
+except ImportError:
+    from queue import Queue, Empty  # Python 3.x
+
+
+# Yield STOP from an input generator to stop the
+# top-level loop without processing any more input.
+STOP = object()
+
+
+class Multiplexer(object):
+    def __init__(self, generators):
+        self.generators = generators
+        self.queue = Queue()
+
+    def loop(self):
+        self._init_readers()
+
+        while True:
+            try:
+                item = self.queue.get(timeout=0.1)
+                if item is STOP:
+                    break
+                else:
+                    yield item
+            except Empty:
+                pass
+
+    def _init_readers(self):
+        for generator in self.generators:
+            t = Thread(target=_enqueue_output, args=(generator, self.queue))
+            t.daemon = True
+            t.start()
+
+
+def _enqueue_output(generator, queue):
+    for item in generator:
+        queue.put(item)