Merge branch 'stderr_line_buffering' of https://github.com/marcus-h/osc

Make stderr line buffered if it does not refer to a tty.

osc-wrapper.py

@@ -23,6 +23,7 @@ except NameError:
     pass
 
 # avoid buffering output on pipes (bnc#930137)
+# Note: the following only applies to python2
 # Basically, a "print('foo')" call is translated to a corresponding
 # fwrite call that writes to the stdout stream (cf. string_print
 # (Objects/stringobject.c) and builtin_print (Python/bltinmodule.c));
@@ -36,6 +37,9 @@ except NameError:
 if not os.isatty(sys.stdout.fileno()):
     sys.stdout = os.fdopen(sys.stdout.fileno(), sys.stdout.mode, 1)
 
+if not os.isatty(sys.stderr.fileno()):
+    sys.stderr = os.fdopen(sys.stderr.fileno(), sys.stderr.mode, 1)
+
 osccli = commandline.Osc()
 
 r = babysitter.run(osccli)