[Python] Add optional flag to disable printing from the SOFA side (#112)

* fix errors introduced by the progresshandler PR

* add optional flag to disable printing from sofa

Author: fredroy

SofaRegressionProgram.py

@@ -145,6 +145,12 @@ def make_parser():
         help='If set, will display more information',
         action='store_true'
     )
+    parser.add_argument(
+        "--quiet",
+        dest="quiet",
+        help='If set, will only print error messages and results.',
+        action='store_true'
+    )
     parser.add_argument(
         "--legacy-regression",
         dest="legacy_mode",
@@ -185,11 +191,25 @@ def make_parser():
         reg_prog.replay_references(replayId)
         sys.exit()
 
+    old_fd = os.dup(1)
+    if args.quiet:
+        # Save and redirect
+        sys.stdout.flush()
+        devnull = os.open(os.devnull, os.O_WRONLY)
+        os.dup2(devnull, 1)
+        os.close(devnull)
+
     if args.write_mode:
         nbr_scenes = reg_prog.write_all_sets_references()
     else:
         nbr_scenes = reg_prog.compare_all_sets_references()
 
+    if args.quiet:
+        # Restore
+        sys.stdout.flush()
+        os.dup2(old_fd, 1)
+        os.close(old_fd)
+
     np.set_printoptions(legacy='1.25') # revert printing floating-point type in numpy (concretely remove np.array when displaying a list of np.float)
 
     print ("### Number of sets Done:  " + str(len(reg_prog.scene_sets)))