NVC is not detected when TCL script is executed within NVC

[Paebbels]

I'm running a regression TCL file with NVC using nvc --do ../regression.tcl. Unfortunately, the NVC environment is not detected by OSVVM Scripts.

@nickg does NVC set any variable or command so OSVVM can determine it's running with NVC itself and not outside via a TCL shell (e.g. tclsh)?

@JimLewis how are other tools detected?
I assume for Riviera-PRO or QuestaSim you run vsim --version?

This question is not about detected NVC vs. GHDL when run in a TCL shell, which is indecisive, but maybe we can detect NVC if the script already runs with NVC.