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And Verilog. Not that it matters much since tools can utilize heuristics to figure out the actual language used.

How do you use heuristics when creating a new file?

In this case, just check if there is, near the beginning of file:

#include "vely.h"

which has to be in every Vely .v file.

A new file won't have that at the top. Unless you create it first by copying a template, I guess.