I've today added a new debugging tool in Nasal: debug.proptrace().
It lists every node creation or deletion, and every write access
to a property node to the console (except direct writes to tied
properties). The output is by default colored like almost
every output from the debug.nas module. To change that, use
--prop:sim/startup/terminal-ansi-colors=0
The function traces by default the *whole* tree for one
second. With debug.proptrace() you get something like this:
...
SET /environment/current-tile-id = 942050 (INT)
SET /environment/atmosphere/altitude-troposphere-top = 12997.65078857355
(DOUBLE, T)
SET /environment/atmosphere/altitude-half-to-sun = 6498.031123964116 (DOUBLE,
T)
-------------------- FRAME --------------------
SET /sim/signals/frame = 1 (BOOL, L1)
SET /sim/time/delta-realtime-sec = 0.6916666666666666 (DOUBLE)
SET /sim/time/delta-sec = 0.6916666666666666 (DOUBLE)
SET /systems/refuel/contact = 0 (BOOL)
...
where the FRAME line marks the begin of a frame. You can also
select just a subtree, and let it be traced for an arbitrary
time: debug.proptrace("/sim/model", 10); # 10 seconds
The output will also contain lines like the following when
properties are generated or removed:
ADD /sim/model/foo
DEL /sim/model/foo
People may want to use this function to check how often properties
with attached listeners are written to. These contain an L[0-9]+
statement in the attribute part: (BOOL, L1) means that it's a
boolean property with one attached listener. The proptrace()
function works itself with listeners, hence the "Extreme Listening"
in the title. :-)
m.
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