How to customize CTRL-W CTRL-F?

Hi,

I want to customize the behavior of CTRL-W CTRL-F. For example, it is
of the pattern #include <header.h>, I will search for C and C++ header
file directories. If it is of the pattern import os, I'll search for
python library directories for file os.py.

More generally, it a line match for some pattern, I will call an
external program (the program could be written as a vim function) to
resolve the file to be opened.

:help CTRL-W_f doesn't tell me how to customize it. Could anybody let
me know how to do so? Thanks!

Regards,
Peng

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