[gtk-vnc] gvncviewer.py: suppress noisy output

[Daniel P. Berrange <dberrange src gnome org>]

commit bc9d2cbdd8a133efcad43dbbe319ddf811981cee
Author: Dr. Matthias St. Pierre <matthias st pierre ncp-e com>
Date:   Fri Oct 23 01:03:36 2020 +0200

    gvncviewer.py: suppress noisy output
    
    Don't print anything to stdout unless the `--verbose (-v)`
    option is provided.

 examples/gvncviewer.py | 45 +++++++++++++++++++++++++++++----------------
 1 file changed, 29 insertions(+), 16 deletions(-)
---
diff --git a/examples/gvncviewer.py b/examples/gvncviewer.py
index f646f1b..e206eb6 100755
--- a/examples/gvncviewer.py
+++ b/examples/gvncviewer.py
@@ -40,6 +40,19 @@ if len(sys.argv) != 2 and len(sys.argv) != 3:
     print(usage)
     sys.exit(1)
 
+
+# a fancy 'print_nothing' lambda function
+info = lambda *args, **kwargs : None
+
+if "-v" in sys.argv:
+       info = print
+       sys.argv.remove("-v")
+
+if "--verbose" in sys.argv:
+       info = print
+       sys.argv.remove("--verbose")
+
+
 import gi
 gi.require_version('Gtk', '3.0')
 gi.require_version('GtkVnc', '2.0')
@@ -68,12 +81,12 @@ def vnc_screenshot(src, ev, vnc):
     if ev.keyval == Gdk.KEY_F11:
         pix = vnc.get_pixbuf()
         pix.savev("gvncviewer.png", "png", ["tEXt::Generator App"], ["gvncviewer.py"])
-        print("Screenshot saved to gvncviewer.png")
+        info("Screenshot saved to gvncviewer.png")
 
     return False
 
 def vnc_close(src, window, data = None):
-    print("Window closed by user")
+    info("Window closed by user")
     Gtk.main_quit()
 
 def vnc_grab(src, window):
@@ -83,46 +96,46 @@ def vnc_ungrab(src, window):
     set_title(src, window, False)
 
 def vnc_connected(src):
-    print("Connected to server")
+    info("Connected to server")
 
 def vnc_initialized(src, window):
-    print("Connection initialized")
+    info("Connection initialized")
     set_title(src, window, False)
     window.show_all()
 
 def vnc_disconnected(src):
-    print("Disconnected from server")
+    info("Disconnected from server")
     Gtk.main_quit()
 
 def send_caf1(src, vnc):
-    print("Send Ctrl+Alt+F1")
+    info("Send Ctrl+Alt+F1")
     vnc.send_keys([Gdk.KEY_Control_L, Gdk.KEY_Alt_L, Gdk.KEY_F1])
 
 def send_caf2(src, vnc):
-    print("Send Ctrl+Alt+F2")
+    info("Send Ctrl+Alt+F2")
     vnc.send_keys([Gdk.KEY_Control_L, Gdk.KEY_Alt_L, Gdk.KEY_F2])
 
 def send_caf3(src, vnc):
-    print("Send Ctrl+Alt+F3")
+    info("Send Ctrl+Alt+F3")
     vnc.send_keys([Gdk.KEY_Control_L, Gdk.KEY_Alt_L, Gdk.KEY_F3])
 
 def send_caf7(src, vnc):
-    print("Send Ctrl+Alt+F7")
+    info("Send Ctrl+Alt+F7")
     vnc.send_keys([Gdk.KEY_Control_L, Gdk.KEY_Alt_L, Gdk.KEY_F7])
 
 def send_cad(src, vnc):
-    print("Send Ctrl+Alt+Del")
+    info("Send Ctrl+Alt+Del")
     vnc.send_keys([Gdk.KEY_Control_L, Gdk.KEY_Alt_L, Gdk.KEY_Delete])
 
 def send_cab(src, vnc):
-    print("Send Ctrl+Alt+BackSpace")
+    info("Send Ctrl+Alt+BackSpace")
     vnc.send_keys([Gdk.KEY_Control_L, Gdk.KEY_Alt_L, Gdk.KEY_BackSpace])
 
 def vnc_auth_cred(src, credList):
     prompt = 0
     data = []
 
-    print(type(credList))
+    info(type(credList))
     for i in range(credList.n_values):
         data.append(None)
         if credList.get_nth(i) in (GtkVnc.DisplayCredential.USERNAME, GtkVnc.DisplayCredential.PASSWORD):
@@ -174,10 +187,10 @@ def vnc_auth_cred(src, credList):
     for i in range(credList.n_values):
         if i < len(data) and data[i] != None:
             if src.set_credential(credList.get_nth(i), data[i]):
-                print("Cannot set credential type %d" % (credList.get_nth(i)))
+                info("Cannot set credential type %d" % (credList.get_nth(i)))
                 src.close()
         else:
-            print("Unsupported credential type %d" % (credList.get_nth(i)))
+            info("Unsupported credential type %d" % (credList.get_nth(i)))
             src.close()
 
 window = Gtk.Window()
@@ -247,11 +260,11 @@ else:
 if host == "unix":
     import socket
     domain_socket = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM, 0)
-    print("Connecting to domain socket", path)
+    info("Connecting to domain socket", path)
     domain_socket.connect(path)
     vnc.open_fd(domain_socket.fileno())
 else:
-    print("Connecting to %s:%s" % (host, port))
+    info("Connecting to %s:%s" % (host, port))
     vnc.open_host(host, port)
 
 vnc.connect("vnc-pointer-grab", vnc_grab, window)