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Paulo Moura
@pmoura
You may also want to simplify the calls by defining a predicate shortcut. For example:
:- uses(logtalk, [print_message(debug, foo, Message) as dbg(Message)]).
Printing of debug message requires the debug flag to be on when the call is made, not when the code making the calls is compiled.
Paulo Moura
@pmoura
See the remarks section on https://logtalk.org/library/logtalk_0.html and also https://logtalk.org/manuals/userman/debugging.html#debugging-messages
A Man With A Clever Disguise
@ACleverDisguise
I'm still completely unable to get debug messages to print. information, warning, error, etc. all do, but debug don't.
Paulo Moura
@pmoura
Maybe put the minimal code required to reproduce the issue in a public paste bin?
A Man With A Clever Disguise
@ACleverDisguise
Before that, just a quick question: in my debug.lgt file:
:- initialization((
    logtalk_load(loader),
    logtalk_load(debugger(loader)),
    set_logtalk_flag(debug, on),
    debugger::trace
)).
Paulo Moura
@pmoura
Isn't the loader file loading the code that you want to debug?
A Man With A Clever Disguise
@ACleverDisguise
The loader file loads the library, yes, and compiles it with debug.
Then in the debug file I load the debugger and set the debug flag.
Paulo Moura
@pmoura
Ok.
A Man With A Clever Disguise
@ACleverDisguise
But in circumstances I'm trying to characterize now, when I do current_logtalk_flag/2 I get 'off'.
And that is likely the source of my problems. But I can't figure out when it's turning the flag off.
Paulo Moura
@pmoura
In that initilization/1 directive above, you're turning on the debug flag globally.
A Man With A Clever Disguise
@ACleverDisguise
Yes. That's what I was expecting.
I want my debug messages to display while I'm debugging.
Paulo Moura
@pmoura
After you load the file above containg that initilization/1 directive, current_logtalk_flag(debug,on) should be true and your debug messages should be displayed.
A Man With A Clever Disguise
@ACleverDisguise
There's a path that somehow gets me to that flag being off.
I haven't figured it out, but that's the source of the problem.
The flag is turned off at some point in operations.
Paulo Moura
@pmoura
Nothing in that directive would do that.
Do you have some code compiled in optimized mode?
A Man With A Clever Disguise
@ACleverDisguise
I mess around with {*}, {?}, and loading other helper scripts (like my tester), so one of those may be turning it off again.
Just the library code.
Paulo Moura
@pmoura
And you have debug calls in that library code that you're compiling in optimized mode?
A Man With A Clever Disguise
@ACleverDisguise
No, I mean YOUR standard library. :D
Paulo Moura
@pmoura
Ok.
A Man With A Clever Disguise
@ACleverDisguise
:- initialization((
    logtalk_load([
        dictionaries(loader),
        types(loader)], [optimize(on), debug(off)]),
    logtalk_load([
        two3tree
    ], [optimize(off), debug(on)])
)).
That's the loader script.
Paulo Moura
@pmoura
So, the debug calls that are not printing are iside your application objects?
A Man With A Clever Disguise
@ACleverDisguise
Yes, or my tests.
Paulo Moura
@pmoura
logtalk_load([dictionaries(loader),types(loader)], [optimize(on), debug(off)]) can simply be logtalk_load([dictionaries(loader),types(loader)]).
A Man With A Clever Disguise
@ACleverDisguise
It defaults to optimize and no debug?
I tend to over-specify to establish intent.
Paulo Moura
@pmoura
No. But the loader files for those libraries already ensure they are compiled in optimized mode.
Is two2tree a single file or a loader file?
A Man With A Clever Disguise
@ACleverDisguise
A single file for now.
OK, I found the path.
Paulo Moura
@pmoura
Ok.
?
A Man With A Clever Disguise
@ACleverDisguise
If I load the tester.lgt by itself the flag is clear because of course it is.
I need to load debug first, then tester, to have the debug flag set.
Paulo Moura
@pmoura
It may be simpler to remove the calls to set_logtalk_flag(debug,on) from those initialization directives and just call this goal at the top-level (assuming here you're doing interactive debugging) when you want to see the debug messages.
A Man With A Clever Disguise
@ACleverDisguise
Probably, yes.
Well, when I'm debugging I will always want to see them. It's when I run just the tester that I'll do it manually.
Paulo Moura
@pmoura
You can always have multiple loader files, e.g. loader.lgt, loader_debug.lgt, ...
A Man With A Clever Disguise
@ACleverDisguise
I was trying to be too tricky for my own good by having a root loader that gets modified depending on if I want to debug, test, etc.
I'll just stop trying to be too DRY.
It's not as if these scripts change a lot.
Paulo Moura
@pmoura
Your loader_debug.lgt file can simply do logtalk_load(loader) +set_logtalk_flag(debug,on)` + ... so you would still use a single root loader file and derive from it in a minmal way.