tools/analyze-recording: add --print-state to always print values

Helpful in comparing values that update frequently - without this the
last printed value may be way off the page when some other value comes
in that it needs to be compared to.

Values not seen yet default to zero - we can't query those from a
recording but it'll be good enough this way.

Signed-off-by: Peter Hutterer <peter.hutterer@who-t.net>

tools/libinput-analyze-recording.py

@@ -87,6 +87,12 @@ def main(argv):
         default="",
         help="A comma-separated list of axis names to print, ignoring all others",
     )
+    parser.add_argument(
+        "--print-state",
+        action="store_true",
+        default=False,
+        help="Always print all axis values, even unchanged ones",
+    )
 
     args = parser.parse_args()
     if args.ignore and args.only:
@@ -148,6 +154,7 @@ def main(argv):
     print(header_line)
     print("-" * len(header_line))
 
+    current_codes = []
     current_frame = {}  # {evdev-code: value}
     axes_in_use = {}  # to print axes never sending events
     last_fields = []  # to skip duplicate lines
@@ -164,12 +171,16 @@ def main(argv):
             keystate_changed = True
         elif is_tracked_axis(e.code, only_axes, ignored_axes):
             current_frame[e.code] = e.value
+            current_codes.append(e.code)
         elif e.code == libevdev.EV_SYN.SYN_REPORT:
             fields = []
             for a in axes:
-                s = format_value(a, current_frame[a]) if a in current_frame else " "
+                if args.print_state or a in current_codes:
+                    s = format_value(a, current_frame.get(a, 0))
+                else:
+                    s = ""
                 fields.append(s.rjust(max(MIN_FIELD_WIDTH, axes[a])))
-            current_frame = {}
+            current_codes = []
 
             if last_fields != fields or keystate_changed:
                 last_fields = fields.copy()