How to avoid Evaluator-Preparse-Dummy-Filename.txt?

Help & Support
1

Occasionally, a file Evaluator-Preparse-Dummy-Filename.txt gets processed by the Evaluator, for example in this button:

@nodeselect

@perfile:begin

=f=Left(file, 1)
=Output(file + ": " + f)

@perfile:end

which might return

Evaluator:  Evaluator-Preparse-Dummy-Filename.txt: E
Evaluator:  AAA.txt: A
Evaluator:  BBB.txt: B

Is that a bug, or do I need to tweak the code?

2

Opus will sometimes run the Evaluator code with that filename if it's parsing the button to see which things it needs (e.g. selected files).

If you need a proper way to detect when that's happening, we could add a variable that's set when it's being done. But most of the time you can just ignore it, since the results won't actually be run.

3

Of course changing the behaviour in response to the dummy filename would kind of defeat the purpose (which is to see what data the evaluation clause needs).