more piping fixes for multiple commands

news/rs.rst

@@ -52,5 +52,6 @@
   if previous commands have executed successfully.  This is helpful
   for pipelines where the last command takes a long time to start up,
   such as GNU Parallel. This also checks to make sure that output has occured.
+  This includes piping 2+ commands together.
 
 **Security:** None

tests/test_integrations.py

@@ -139,6 +139,13 @@ with open('tttt', 'w') as fp:
 
 ![cat tttt | wc]
 """, '      1       2      10\n' if ON_WINDOWS else " 1  2 9 <stdin>\n", 0),
+# test double  piping 'real' command
+("""
+with open('tttt', 'w') as fp:
+    fp.write("Wow mom!\\n")
+
+![cat tttt | wc | wc]
+""", '      1       4      24\n' if ON_WINDOWS else " 1  4 16 <stdin>\n", 0),
 ]
 
 

xonsh/proc.py

@@ -1513,7 +1513,7 @@ class CommandPipeline:
                 elif prev_end_time is None:
                     # or see if we already know that the next-to-last
                     # proc in teh pipeline has ended.
-                    if self.procs[-2].poll() is not None:
+                    if self._prev_procs_done():
                         # if it has, record the time
                         prev_end_time = time.time()
                 elif time.time() - prev_end_time >= 0.1: